diff --git a/app/Enums/TimeEntryAggregationType.php b/app/Enums/TimeEntryAggregationType.php
index aa36a7cd..a5056ac2 100644
--- a/app/Enums/TimeEntryAggregationType.php
+++ b/app/Enums/TimeEntryAggregationType.php
@@ -20,6 +20,7 @@ enum TimeEntryAggregationType: string
     case Client = 'client';
     case Billable = 'billable';
     case Description = 'description';
+    case Tag = 'tag';
 
     public static function fromInterval(TimeEntryAggregationTypeInterval $timeEntryAggregationTypeInterval): TimeEntryAggregationType
     {
diff --git a/app/Service/TimeEntryAggregationService.php b/app/Service/TimeEntryAggregationService.php
index a59becbd..6cd38329 100644
--- a/app/Service/TimeEntryAggregationService.php
+++ b/app/Service/TimeEntryAggregationService.php
@@ -10,6 +10,7 @@ use App\Enums\TimeEntryRoundingType;
 use App\Enums\Weekday;
 use App\Models\Client;
 use App\Models\Project;
+use App\Models\Tag;
 use App\Models\Task;
 use App\Models\TimeEntry;
 use App\Models\User;
@@ -17,6 +18,7 @@ use Carbon\CarbonTimeZone;
 use Illuminate\Database\Eloquent\Builder;
 use Illuminate\Support\Carbon;
 use Illuminate\Support\Collection;
+use Illuminate\Support\Facades\DB;
 use Illuminate\Support\Facades\Log;
 
 class TimeEntryAggregationService
@@ -45,9 +47,21 @@ class TimeEntryAggregationService
     public function getAggregatedTimeEntries(Builder $timeEntriesQuery, ?TimeEntryAggregationType $group1Type, ?TimeEntryAggregationType $group2Type, string $timezone, Weekday $startOfWeek, bool $fillGapsInTimeGroups, ?Carbon $start, ?Carbon $end, bool $showBillableRate, ?TimeEntryRoundingType $roundingType, ?int $roundingMinutes): array
     {
         $fillGapsInTimeGroupsIsPossible = $fillGapsInTimeGroups && $start !== null && $end !== null;
+        /** @var Builder<TimeEntry> $baseTotalsQuery */
+        $baseTotalsQuery = $timeEntriesQuery->clone();
         $group1Select = null;
         $group2Select = null;
         $groupBy = null;
+        // If any grouping is by tag, expand rows per tag and ensure a NULL row for entries without tags
+        if (($group1Type === TimeEntryAggregationType::Tag) || ($group2Type === TimeEntryAggregationType::Tag)) {
+            $timeEntriesQuery->crossJoin(DB::raw(
+                "LATERAL (\n".
+                "  SELECT jsonb_array_elements_text(coalesce(tags, '[]'::jsonb)) AS tag\n".
+                "  UNION ALL\n".
+                "  SELECT ''::text AS tag WHERE coalesce(jsonb_array_length(tags), 0) = 0\n".
+                ') AS tag(tag)'
+            ));
+        }
         if ($group1Type !== null) {
             $group1Select = $this->getGroupByQuery($group1Type, $timezone, $startOfWeek);
             $groupBy = ['group_1'];
@@ -84,6 +98,26 @@ class TimeEntryAggregationService
             $group1Response = [];
             $group1ResponseSum = 0;
             $group1ResponseCost = 0;
+            // If Tag is subgroup, prepare base totals per primary group without tag expansion
+            $baseTotalsPerGroup1Map = [];
+            if ($group2Type === TimeEntryAggregationType::Tag) {
+                $baseTotalsPerGroup1Query = $baseTotalsQuery->clone();
+                $baseTotalsPerGroup1 = $baseTotalsPerGroup1Query
+                    ->selectRaw(
+                        $group1Select.' as group_1,'.
+                        ' round(sum(extract(epoch from ('.$endRawSelect.' - '.$startRawSelect.')))) as aggregate,'.
+                        ' round(sum(extract(epoch from ('.$endRawSelect.' - '.$startRawSelect.')) * (coalesce(billable_rate, 0)::float/60/60))) as cost'
+                    )
+                    ->groupBy('group_1')
+                    ->get();
+                foreach ($baseTotalsPerGroup1 as $row) {
+                    /** @var object{group_1: mixed, aggregate: int|null, cost: int|null} $row */
+                    $baseTotalsPerGroup1Map[(string) ($row->group_1 ?? '')] = [
+                        'aggregate' => (int) ($row->aggregate ?? 0),
+                        'cost' => (int) ($row->cost ?? 0),
+                    ];
+                }
+            }
             foreach ($groupedAggregates as $group1 => $group1Aggregates) {
                 /** @var string|int $group1 */
                 $group2Response = [];
@@ -103,6 +137,14 @@ class TimeEntryAggregationService
                         $group2ResponseSum += (int) $aggregate->get(0)->aggregate;
                         $group2ResponseCost += (int) $aggregate->get(0)->cost;
                     }
+                    // Override primary group totals when Tag is subgroup to avoid double counting
+                    if ($group2Type === TimeEntryAggregationType::Tag) {
+                        $keyForMap = (string) $group1;
+                        if (array_key_exists($keyForMap, $baseTotalsPerGroup1Map)) {
+                            $group2ResponseSum = $baseTotalsPerGroup1Map[$keyForMap]['aggregate'];
+                            $group2ResponseCost = $baseTotalsPerGroup1Map[$keyForMap]['cost'];
+                        }
+                    }
                 } else {
                     /** @var Collection<int, object{aggregate: int, cost: int}> $group1Aggregates */
                     $group2ResponseSum = (int) $group1Aggregates->get(0)->aggregate;
@@ -121,6 +163,23 @@ class TimeEntryAggregationService
                 $group1ResponseCost += $group2ResponseCost;
             }
 
+            // If Tag is selected in any grouping, compute overall totals from base (non-tag-expanded) query to avoid double counting
+            $hasTagGrouping = ($group1Type === TimeEntryAggregationType::Tag) || ($group2Type === TimeEntryAggregationType::Tag);
+            if ($hasTagGrouping) {
+                // Reset selects and ordering on the cloned base query
+                $baseTotals = $baseTotalsQuery
+                    ->selectRaw(
+                        ' round(sum(extract(epoch from ('.$endRawSelect.' - '.$startRawSelect.')))) as aggregate,'.
+                        ' round(sum(extract(epoch from ('.$endRawSelect.' - '.$startRawSelect.')) * (coalesce(billable_rate, 0)::float/60/60))) as cost'
+                    )
+                    ->first();
+                if ($baseTotals !== null) {
+                    /** @var object{aggregate: int|null, cost: int|null} $baseTotals */
+                    $group1ResponseSum = (int) ($baseTotals->aggregate ?? 0);
+                    $group1ResponseCost = (int) ($baseTotals->cost ?? 0);
+                }
+            }
+
             if ($fillGapsInTimeGroupsIsPossible) {
                 $group1Response = $this->fillGapsInTimeGroups($group1Response, $group1Type, $group2Type, $timezone, $startOfWeek, $start, $end);
             }
@@ -294,6 +353,17 @@ class TimeEntryAggregationService
                     'color' => null,
                 ];
             }
+        } elseif ($type === TimeEntryAggregationType::Tag) {
+            $tags = Tag::query()
+                ->whereIn('id', $keys)
+                ->select('id', 'name')
+                ->get();
+            foreach ($tags as $tag) {
+                $descriptorMap[$tag->id] = [
+                    'description' => $tag->name,
+                    'color' => null,
+                ];
+            }
         }
 
         return $descriptorMap;
@@ -436,6 +506,8 @@ class TimeEntryAggregationService
             return 'billable';
         } elseif ($group === TimeEntryAggregationType::Description) {
             return 'description';
+        } elseif ($group === TimeEntryAggregationType::Tag) {
+            return 'tag';
         }
     }
 
diff --git a/resources/js/Components/Common/Reporting/ReportingChart.vue b/resources/js/Components/Common/Reporting/ReportingChart.vue
index b275df62..241ed88b 100644
--- a/resources/js/Components/Common/Reporting/ReportingChart.vue
+++ b/resources/js/Components/Common/Reporting/ReportingChart.vue
@@ -113,7 +113,7 @@ const option = computed(() => ({
         },
         axisLabel: {
             fontSize: 12,
-            fontWeight: 600,
+            fontWeight: 400,
             color: labelColor.value,
             margin: 16,
             fontFamily: 'Inter, sans-serif',
diff --git a/resources/js/Components/Common/Reporting/ReportingRow.vue b/resources/js/Components/Common/Reporting/ReportingRow.vue
index e649923d..031be28f 100644
--- a/resources/js/Components/Common/Reporting/ReportingRow.vue
+++ b/resources/js/Components/Common/Reporting/ReportingRow.vue
@@ -30,10 +30,7 @@ const organization = inject<ComputedRef<Organization>>('organization');
 <template>
     <div
         class="contents text-text-primary [&>*]:transition [&>*]:border-card-background-separator [&>*]:border-b [&>*]:h-[50px]">
-        <div
-            :class="
-                twMerge('pl-6 font-medium flex items-center space-x-3', props.indent ? 'pl-16' : '')
-            ">
+        <div :class="twMerge('pl-6 flex items-center space-x-3', props.indent ? 'pl-16' : '')">
             <GroupedItemsCountButton
                 v-if="entry.grouped_data && entry.grouped_data?.length > 0"
                 :expanded="expanded"
diff --git a/resources/js/packages/api/src/openapi.json.client.ts b/resources/js/packages/api/src/openapi.json.client.ts
index 5eb2bf9d..731707b7 100644
--- a/resources/js/packages/api/src/openapi.json.client.ts
+++ b/resources/js/packages/api/src/openapi.json.client.ts
@@ -36,20 +36,14 @@ const ClientResource = z
 const ClientCollection = z.array(ClientResource);
 const ClientStoreRequest = z.object({ name: z.string().min(1).max(255) }).passthrough();
 const ClientUpdateRequest = z
-    .object({
-        name: z.string().min(1).max(255),
-        is_archived: z.boolean().optional(),
-    })
+    .object({ name: z.string().min(1).max(255), is_archived: z.boolean().optional() })
     .passthrough();
 const ImportRequest = z.object({ type: z.string(), data: z.string() }).passthrough();
 const InvitationResource = z
     .object({ id: z.string(), email: z.string(), role: z.string() })
     .passthrough();
 const InvitationStoreRequest = z
-    .object({
-        email: z.string().email(),
-        role: z.enum(['admin', 'manager', 'employee']),
-    })
+    .object({ email: z.string().email(), role: z.enum(['admin', 'manager', 'employee']) })
     .passthrough();
 const InvoiceResource = z
     .object({
@@ -97,6 +91,7 @@ const InvoiceStoreRequest = z
         billing_period_end: z.union([z.string(), z.null()]).optional(),
         reference: z.string(),
         currency: z.string(),
+        payment_iban: z.union([z.string(), z.null()]).optional(),
         tax_rate: z.number().int().gte(0).lte(2147483647).optional(),
         discount_amount: z.number().int().gte(0).lte(9223372036854776000).optional(),
         discount_type: InvoiceDiscountType.optional(),
@@ -123,10 +118,10 @@ const InvoiceEntryResource = z
         id: z.string(),
         invoice_id: z.string(),
         name: z.string(),
-        description: z.union([z.string(), z.null()]),
-        unit_price: z.number().int(),
+        description: z.string(),
+        unit_price: z.string(),
         quantity: z.number(),
-        order_index: z.number().int(),
+        order_index: z.string(),
         created_at: z.union([z.string(), z.null()]),
         updated_at: z.union([z.string(), z.null()]),
     })
@@ -161,6 +156,7 @@ const DetailedInvoiceResource = z
         discount_type: z.string(),
         discount_amount: z.number().int(),
         tax_rate: z.number().int(),
+        payment_iban: z.string(),
         status: z.string(),
         currency: z.string(),
         date: z.string(),
@@ -206,6 +202,7 @@ const InvoiceUpdateRequest = z
         billing_period_end: z.union([z.string(), z.null()]),
         reference: z.string(),
         currency: z.string(),
+        payment_iban: z.union([z.string(), z.null()]),
         tax_rate: z.number().int().gte(0).lte(2147483647),
         discount_amount: z.number().int().gte(0).lte(9223372036854776000),
         discount_type: InvoiceDiscountType,
@@ -388,10 +385,7 @@ const ProjectMemberResource = z
     })
     .passthrough();
 const ProjectMemberStoreRequest = z
-    .object({
-        member_id: z.string(),
-        billable_rate: z.union([z.number(), z.null()]).optional(),
-    })
+    .object({ member_id: z.string(), billable_rate: z.union([z.number(), z.null()]).optional() })
     .passthrough();
 const ProjectMemberUpdateRequest = z
     .object({ billable_rate: z.union([z.number(), z.null()]) })
@@ -420,6 +414,7 @@ const TimeEntryAggregationType = z.enum([
     'client',
     'billable',
     'description',
+    'tag',
 ]);
 const TimeEntryAggregationTypeInterval = z.enum(['day', 'week', 'month', 'year']);
 const Weekday = z.enum([
@@ -431,6 +426,7 @@ const Weekday = z.enum([
     'saturday',
     'sunday',
 ]);
+const TimeEntryRoundingType = z.enum(['up', 'down', 'nearest']);
 const ReportStoreRequest = z
     .object({
         name: z.string().max(255),
@@ -453,6 +449,8 @@ const ReportStoreRequest = z
                 history_group: TimeEntryAggregationTypeInterval,
                 week_start: Weekday.optional(),
                 timezone: z.union([z.string(), z.null()]).optional(),
+                rounding_type: TimeEntryRoundingType.optional(),
+                rounding_minutes: z.union([z.number(), z.null()]).optional(),
             })
             .passthrough(),
     })
@@ -479,6 +477,8 @@ const DetailedReportResource = z
                 project_ids: z.union([z.array(z.string()), z.null()]),
                 tag_ids: z.union([z.array(z.string()), z.null()]),
                 task_ids: z.union([z.array(z.string()), z.null()]),
+                rounding_type: z.union([z.string(), z.null()]),
+                rounding_minutes: z.union([z.number(), z.null()]),
             })
             .passthrough(),
         created_at: z.string(),
@@ -592,12 +592,7 @@ const DetailedWithDataReportResource = z
     })
     .passthrough();
 const TagResource = z
-    .object({
-        id: z.string(),
-        name: z.string(),
-        created_at: z.string(),
-        updated_at: z.string(),
-    })
+    .object({ id: z.string(), name: z.string(), created_at: z.string(), updated_at: z.string() })
     .passthrough();
 const TagCollection = z.array(TagResource);
 const TagStoreRequest = z.object({ name: z.string().min(1).max(255) }).passthrough();
@@ -629,6 +624,7 @@ const TaskUpdateRequest = z
     })
     .passthrough();
 const start = z.union([z.string(), z.null()]).optional();
+const rounding_minutes = z.union([z.number(), z.null()]).optional();
 const TimeEntryResource = z
     .object({
         id: z.string(),
@@ -749,6 +745,7 @@ export const schemas = {
     TimeEntryAggregationType,
     TimeEntryAggregationTypeInterval,
     Weekday,
+    TimeEntryRoundingType,
     ReportStoreRequest,
     DetailedReportResource,
     ReportUpdateRequest,
@@ -761,6 +758,7 @@ export const schemas = {
     TaskStoreRequest,
     TaskUpdateRequest,
     start,
+    rounding_minutes,
     TimeEntryResource,
     TimeEntryStoreRequest,
     TimeEntryUpdateMultipleRequest,
@@ -790,13 +788,7 @@ const endpoints = makeApi([
         alias: 'getCurrencies',
         requestFormat: 'json',
         response: z.array(
-            z
-                .object({
-                    code: z.string(),
-                    name: z.string(),
-                    symbol: z.string(),
-                })
-                .passthrough()
+            z.object({ code: z.string(), name: z.string(), symbol: z.string() }).passthrough()
         ),
     },
     {
@@ -868,10 +860,7 @@ const endpoints = makeApi([
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -1166,13 +1155,7 @@ const endpoints = makeApi([
             },
         ],
         response: z.array(
-            z
-                .object({
-                    value: z.number().int(),
-                    name: z.string(),
-                    color: z.string(),
-                })
-                .passthrough()
+            z.object({ value: z.number().int(), name: z.string(), color: z.string() }).passthrough()
         ),
         errors: [
             {
@@ -1235,10 +1218,7 @@ const endpoints = makeApi([
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -1281,10 +1261,7 @@ const endpoints = makeApi([
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -1332,10 +1309,7 @@ const endpoints = makeApi([
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -1363,11 +1337,7 @@ const endpoints = makeApi([
                 status: 400,
                 description: `API exception`,
                 schema: z
-                    .object({
-                        error: z.boolean(),
-                        key: z.string(),
-                        message: z.string(),
-                    })
+                    .object({ error: z.boolean(), key: z.string(), message: z.string() })
                     .passthrough(),
             },
             {
@@ -1405,11 +1375,7 @@ const endpoints = makeApi([
                 status: 400,
                 description: `API exception`,
                 schema: z
-                    .object({
-                        error: z.boolean(),
-                        key: z.string(),
-                        message: z.string(),
-                    })
+                    .object({ error: z.boolean(), key: z.string(), message: z.string() })
                     .passthrough(),
             },
             {
@@ -1465,7 +1431,7 @@ const endpoints = makeApi([
                 status: 400,
                 schema: z.union([
                     z.object({ message: z.string() }).passthrough(),
-                    z.object({ message: z.string() }).passthrough(),
+                    z.object({ message: z.literal('Invalid base64 encoded data') }).passthrough(),
                 ]),
             },
             {
@@ -1487,10 +1453,7 @@ const endpoints = makeApi([
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -1511,11 +1474,7 @@ const endpoints = makeApi([
             .object({
                 data: z.array(
                     z
-                        .object({
-                            key: z.string(),
-                            name: z.string(),
-                            description: z.string(),
-                        })
+                        .object({ key: z.string(), name: z.string(), description: z.string() })
                         .passthrough()
                 ),
             })
@@ -1603,10 +1562,7 @@ const endpoints = makeApi([
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -1634,11 +1590,7 @@ const endpoints = makeApi([
                 status: 400,
                 description: `API exception`,
                 schema: z
-                    .object({
-                        error: z.boolean(),
-                        key: z.string(),
-                        message: z.string(),
-                    })
+                    .object({ error: z.boolean(), key: z.string(), message: z.string() })
                     .passthrough(),
             },
             {
@@ -1660,10 +1612,7 @@ const endpoints = makeApi([
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -1809,10 +1758,7 @@ const endpoints = makeApi([
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -1855,10 +1801,7 @@ const endpoints = makeApi([
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -1901,10 +1844,7 @@ const endpoints = makeApi([
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -1923,7 +1863,7 @@ const endpoints = makeApi([
             {
                 name: 'invoice',
                 type: 'Path',
-                schema: z.string(),
+                schema: z.number().int(),
             },
         ],
         response: z.object({ data: DetailedInvoiceResource }).passthrough(),
@@ -1964,7 +1904,7 @@ const endpoints = makeApi([
             {
                 name: 'invoice',
                 type: 'Path',
-                schema: z.string(),
+                schema: z.number().int(),
             },
         ],
         response: z.object({ data: DetailedInvoiceResource }).passthrough(),
@@ -1988,10 +1928,7 @@ const endpoints = makeApi([
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -2010,7 +1947,7 @@ const endpoints = makeApi([
             {
                 name: 'invoice',
                 type: 'Path',
-                schema: z.string(),
+                schema: z.number().int(),
             },
         ],
         response: z.void(),
@@ -2051,11 +1988,18 @@ const endpoints = makeApi([
             {
                 name: 'invoice',
                 type: 'Path',
-                schema: z.string(),
+                schema: z.number().int(),
             },
         ],
         response: z.object({ download_link: z.string() }).passthrough(),
         errors: [
+            {
+                status: 400,
+                description: `API exception`,
+                schema: z
+                    .object({ error: z.boolean(), key: z.string(), message: z.string() })
+                    .passthrough(),
+            },
             {
                 status: 401,
                 description: `Unauthenticated`,
@@ -2075,10 +2019,7 @@ const endpoints = makeApi([
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -2097,11 +2038,18 @@ const endpoints = makeApi([
             {
                 name: 'invoice',
                 type: 'Path',
-                schema: z.string(),
+                schema: z.number().int(),
             },
         ],
         response: z.object({ download_link: z.string() }).passthrough(),
         errors: [
+            {
+                status: 400,
+                description: `API exception`,
+                schema: z
+                    .object({ error: z.boolean(), key: z.string(), message: z.string() })
+                    .passthrough(),
+            },
             {
                 status: 401,
                 description: `Unauthenticated`,
@@ -2147,11 +2095,7 @@ const endpoints = makeApi([
                 status: 400,
                 description: `API exception`,
                 schema: z
-                    .object({
-                        error: z.boolean(),
-                        key: z.string(),
-                        message: z.string(),
-                    })
+                    .object({ error: z.boolean(), key: z.string(), message: z.string() })
                     .passthrough(),
             },
             {
@@ -2173,10 +2117,7 @@ const endpoints = makeApi([
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -2246,10 +2187,7 @@ const endpoints = makeApi([
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -2282,11 +2220,7 @@ const endpoints = makeApi([
                 status: 400,
                 description: `API exception`,
                 schema: z
-                    .object({
-                        error: z.boolean(),
-                        key: z.string(),
-                        message: z.string(),
-                    })
+                    .object({ error: z.boolean(), key: z.string(), message: z.string() })
                     .passthrough(),
             },
             {
@@ -2308,10 +2242,7 @@ const endpoints = makeApi([
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -2344,11 +2275,7 @@ const endpoints = makeApi([
                 status: 400,
                 description: `API exception`,
                 schema: z
-                    .object({
-                        error: z.boolean(),
-                        key: z.string(),
-                        message: z.string(),
-                    })
+                    .object({ error: z.boolean(), key: z.string(), message: z.string() })
                     .passthrough(),
             },
             {
@@ -2370,10 +2297,7 @@ const endpoints = makeApi([
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -2401,11 +2325,7 @@ const endpoints = makeApi([
                 status: 400,
                 description: `API exception`,
                 schema: z
-                    .object({
-                        error: z.boolean(),
-                        key: z.string(),
-                        message: z.string(),
-                    })
+                    .object({ error: z.boolean(), key: z.string(), message: z.string() })
                     .passthrough(),
             },
             {
@@ -2448,11 +2368,7 @@ const endpoints = makeApi([
                 status: 400,
                 description: `API exception`,
                 schema: z
-                    .object({
-                        error: z.boolean(),
-                        key: z.string(),
-                        message: z.string(),
-                    })
+                    .object({ error: z.boolean(), key: z.string(), message: z.string() })
                     .passthrough(),
             },
             {
@@ -2515,10 +2431,7 @@ const endpoints = makeApi([
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -2634,10 +2547,7 @@ const endpoints = makeApi([
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -2680,10 +2590,7 @@ const endpoints = makeApi([
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -2767,10 +2674,7 @@ const endpoints = makeApi([
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -2798,11 +2702,7 @@ const endpoints = makeApi([
                 status: 400,
                 description: `API exception`,
                 schema: z
-                    .object({
-                        error: z.boolean(),
-                        key: z.string(),
-                        message: z.string(),
-                    })
+                    .object({ error: z.boolean(), key: z.string(), message: z.string() })
                     .passthrough(),
             },
             {
@@ -2918,11 +2818,7 @@ const endpoints = makeApi([
                 status: 400,
                 description: `API exception`,
                 schema: z
-                    .object({
-                        error: z.boolean(),
-                        key: z.string(),
-                        message: z.string(),
-                    })
+                    .object({ error: z.boolean(), key: z.string(), message: z.string() })
                     .passthrough(),
             },
             {
@@ -2944,10 +2840,7 @@ const endpoints = makeApi([
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -3053,10 +2946,7 @@ const endpoints = makeApi([
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -3140,10 +3030,7 @@ const endpoints = makeApi([
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -3253,10 +3140,7 @@ const endpoints = makeApi([
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -3304,10 +3188,7 @@ const endpoints = makeApi([
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -3335,11 +3216,7 @@ const endpoints = makeApi([
                 status: 400,
                 description: `API exception`,
                 schema: z
-                    .object({
-                        error: z.boolean(),
-                        key: z.string(),
-                        message: z.string(),
-                    })
+                    .object({ error: z.boolean(), key: z.string(), message: z.string() })
                     .passthrough(),
             },
             {
@@ -3434,10 +3311,7 @@ const endpoints = makeApi([
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -3480,10 +3354,7 @@ const endpoints = makeApi([
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -3531,10 +3402,7 @@ const endpoints = makeApi([
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -3562,11 +3430,7 @@ const endpoints = makeApi([
                 status: 400,
                 description: `API exception`,
                 schema: z
-                    .object({
-                        error: z.boolean(),
-                        key: z.string(),
-                        message: z.string(),
-                    })
+                    .object({ error: z.boolean(), key: z.string(), message: z.string() })
                     .passthrough(),
             },
             {
@@ -3639,6 +3503,16 @@ Users with the permission &#x60;time-entries:view:own&#x60; can only use this en
                 type: 'Query',
                 schema: z.enum(['true', 'false']).optional(),
             },
+            {
+                name: 'rounding_type',
+                type: 'Query',
+                schema: z.enum(['up', 'down', 'nearest']).optional(),
+            },
+            {
+                name: 'rounding_minutes',
+                type: 'Query',
+                schema: rounding_minutes,
+            },
             {
                 name: 'user_id',
                 type: 'Query',
@@ -3696,10 +3570,7 @@ Users with the permission &#x60;time-entries:view:own&#x60; can only use this en
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -3727,11 +3598,7 @@ Users with the permission &#x60;time-entries:view:own&#x60; can only use this en
                 status: 400,
                 description: `API exception`,
                 schema: z
-                    .object({
-                        error: z.boolean(),
-                        key: z.string(),
-                        message: z.string(),
-                    })
+                    .object({ error: z.boolean(), key: z.string(), message: z.string() })
                     .passthrough(),
             },
             {
@@ -3753,10 +3620,7 @@ Users with the permission &#x60;time-entries:view:own&#x60; can only use this en
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -3799,10 +3663,7 @@ Users with the permission &#x60;time-entries:view:own&#x60; can only use this en
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -3845,10 +3706,7 @@ Users with the permission &#x60;time-entries:view:own&#x60; can only use this en
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -3881,11 +3739,7 @@ Users with the permission &#x60;time-entries:view:own&#x60; can only use this en
                 status: 400,
                 description: `API exception`,
                 schema: z
-                    .object({
-                        error: z.boolean(),
-                        key: z.string(),
-                        message: z.string(),
-                    })
+                    .object({ error: z.boolean(), key: z.string(), message: z.string() })
                     .passthrough(),
             },
             {
@@ -3907,10 +3761,7 @@ Users with the permission &#x60;time-entries:view:own&#x60; can only use this en
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -3980,6 +3831,7 @@ If the group parameters are all set to &#x60;null&#x60; or are all missing, the
                         'client',
                         'billable',
                         'description',
+                        'tag',
                     ])
                     .optional(),
             },
@@ -3998,6 +3850,7 @@ If the group parameters are all set to &#x60;null&#x60; or are all missing, the
                         'client',
                         'billable',
                         'description',
+                        'tag',
                     ])
                     .optional(),
             },
@@ -4036,6 +3889,16 @@ If the group parameters are all set to &#x60;null&#x60; or are all missing, the
                 type: 'Query',
                 schema: z.enum(['true', 'false']).optional(),
             },
+            {
+                name: 'rounding_type',
+                type: 'Query',
+                schema: z.enum(['up', 'down', 'nearest']).optional(),
+            },
+            {
+                name: 'rounding_minutes',
+                type: 'Query',
+                schema: rounding_minutes,
+            },
             {
                 name: 'member_ids',
                 type: 'Query',
@@ -4120,10 +3983,7 @@ If the group parameters are all set to &#x60;null&#x60; or are all missing, the
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -4158,6 +4018,7 @@ If the group parameters are all set to &#x60;null&#x60; or are all missing, the
                     'client',
                     'billable',
                     'description',
+                    'tag',
                 ]),
             },
             {
@@ -4174,6 +4035,7 @@ If the group parameters are all set to &#x60;null&#x60; or are all missing, the
                     'client',
                     'billable',
                     'description',
+                    'tag',
                 ]),
             },
             {
@@ -4221,6 +4083,16 @@ If the group parameters are all set to &#x60;null&#x60; or are all missing, the
                 type: 'Query',
                 schema: z.enum(['true', 'false']).optional(),
             },
+            {
+                name: 'rounding_type',
+                type: 'Query',
+                schema: z.enum(['up', 'down', 'nearest']).optional(),
+            },
+            {
+                name: 'rounding_minutes',
+                type: 'Query',
+                schema: rounding_minutes,
+            },
             {
                 name: 'member_ids',
                 type: 'Query',
@@ -4256,11 +4128,7 @@ If the group parameters are all set to &#x60;null&#x60; or are all missing, the
                 status: 400,
                 description: `API exception`,
                 schema: z
-                    .object({
-                        error: z.boolean(),
-                        key: z.string(),
-                        message: z.string(),
-                    })
+                    .object({ error: z.boolean(), key: z.string(), message: z.string() })
                     .passthrough(),
             },
             {
@@ -4282,10 +4150,7 @@ If the group parameters are all set to &#x60;null&#x60; or are all missing, the
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -4346,6 +4211,16 @@ If the group parameters are all set to &#x60;null&#x60; or are all missing, the
                 type: 'Query',
                 schema: z.enum(['true', 'false']).optional(),
             },
+            {
+                name: 'rounding_type',
+                type: 'Query',
+                schema: z.enum(['up', 'down', 'nearest']).optional(),
+            },
+            {
+                name: 'rounding_minutes',
+                type: 'Query',
+                schema: rounding_minutes,
+            },
             {
                 name: 'member_ids',
                 type: 'Query',
@@ -4376,11 +4251,7 @@ If the group parameters are all set to &#x60;null&#x60; or are all missing, the
                 status: 400,
                 description: `API exception`,
                 schema: z
-                    .object({
-                        error: z.boolean(),
-                        key: z.string(),
-                        message: z.string(),
-                    })
+                    .object({ error: z.boolean(), key: z.string(), message: z.string() })
                     .passthrough(),
             },
             {
@@ -4402,10 +4273,7 @@ If the group parameters are all set to &#x60;null&#x60; or are all missing, the
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -4487,11 +4355,7 @@ Please note that the access token is only shown in this response and cannot be r
                 status: 400,
                 description: `API exception`,
                 schema: z
-                    .object({
-                        error: z.boolean(),
-                        key: z.string(),
-                        message: z.string(),
-                    })
+                    .object({ error: z.boolean(), key: z.string(), message: z.string() })
                     .passthrough(),
             },
             {
@@ -4508,10 +4372,7 @@ Please note that the access token is only shown in this response and cannot be r
                 status: 422,
                 description: `Validation error`,
                 schema: z
-                    .object({
-                        message: z.string(),
-                        errors: z.record(z.array(z.string())),
-                    })
+                    .object({ message: z.string(), errors: z.record(z.array(z.string())) })
                     .passthrough(),
             },
         ],
@@ -4534,11 +4395,7 @@ Please note that the access token is only shown in this response and cannot be r
                 status: 400,
                 description: `API exception`,
                 schema: z
-                    .object({
-                        error: z.boolean(),
-                        key: z.string(),
-                        message: z.string(),
-                    })
+                    .object({ error: z.boolean(), key: z.string(), message: z.string() })
                     .passthrough(),
             },
             {
@@ -4576,11 +4433,7 @@ Please note that the access token is only shown in this response and cannot be r
                 status: 400,
                 description: `API exception`,
                 schema: z
-                    .object({
-                        error: z.boolean(),
-                        key: z.string(),
-                        message: z.string(),
-                    })
+                    .object({ error: z.boolean(), key: z.string(), message: z.string() })
                     .passthrough(),
             },
             {
diff --git a/resources/js/utils/useReporting.ts b/resources/js/utils/useReporting.ts
index 7d56f6ab..48b74135 100644
--- a/resources/js/utils/useReporting.ts
+++ b/resources/js/utils/useReporting.ts
@@ -12,11 +12,19 @@ import { useProjectsStore } from '@/utils/useProjects';
 import { useMembersStore } from '@/utils/useMembers';
 import { useTasksStore } from '@/utils/useTasks';
 import { useClientsStore } from '@/utils/useClients';
+import { useTagsStore } from '@/utils/useTags';
 import { CheckCircleIcon, UserCircleIcon, UserGroupIcon } from '@heroicons/vue/20/solid';
 import { DocumentTextIcon, FolderIcon } from '@heroicons/vue/16/solid';
 import BillableIcon from '@/packages/ui/src/Icons/BillableIcon.vue';
 
-export type GroupingOption = 'project' | 'task' | 'user' | 'billable' | 'client' | 'description';
+export type GroupingOption =
+    | 'project'
+    | 'task'
+    | 'user'
+    | 'billable'
+    | 'client'
+    | 'description'
+    | 'tag';
 
 export const useReportingStore = defineStore('reporting', () => {
     const reportingGraphResponse = ref<ReportingResponse | null>(null);
@@ -73,6 +81,7 @@ export const useReportingStore = defineStore('reporting', () => {
         billable: 'Non-Billable',
         client: 'No Client',
         description: 'No Description',
+        tag: 'No Tag',
     } as Record<string, string>;
 
     function getNameForReportingRowEntry(key: string | null, type: string | null) {
@@ -106,6 +115,11 @@ export const useReportingStore = defineStore('reporting', () => {
             const { clients } = storeToRefs(clientsStore);
             return clients.value.find((client) => client.id === key)?.name;
         }
+        if (type === 'tag') {
+            const tagsStore = useTagsStore();
+            const { tags } = storeToRefs(tagsStore);
+            return tags.value.find((tag) => tag.id === key)?.name;
+        }
         if (type === 'billable') {
             if (key === '0') {
                 return 'Non-Billable';
@@ -151,6 +165,11 @@ export const useReportingStore = defineStore('reporting', () => {
             value: 'description',
             icon: DocumentTextIcon,
         },
+        {
+            label: 'Tags',
+            value: 'tag',
+            icon: DocumentTextIcon,
+        },
     ];
 
     return {
diff --git a/tests/Unit/Service/TimeEntryAggregationServiceTest.php b/tests/Unit/Service/TimeEntryAggregationServiceTest.php
index b46291b1..4988ef06 100644
--- a/tests/Unit/Service/TimeEntryAggregationServiceTest.php
+++ b/tests/Unit/Service/TimeEntryAggregationServiceTest.php
@@ -9,6 +9,7 @@ use App\Enums\TimeEntryRoundingType;
 use App\Enums\Weekday;
 use App\Models\Client;
 use App\Models\Project;
+use App\Models\Tag;
 use App\Models\TimeEntry;
 use App\Service\TimeEntryAggregationService;
 use Illuminate\Support\Carbon;
@@ -1007,4 +1008,201 @@ class TimeEntryAggregationServiceTest extends TestCaseWithDatabase
             ],
         ], $result);
     }
+
+    public function test_aggregate_time_entries_group_by_tag_includes_no_tag_and_avoids_double_counting_overall(): void
+    {
+        // Arrange
+        $tag1 = Tag::factory()->create();
+        $tag2 = Tag::factory()->create();
+        $start = Carbon::now();
+
+        // One entry with two tags (100s)
+        TimeEntry::factory()->startWithDuration($start, 100)->create([
+            'tags' => [$tag1->getKey(), $tag2->getKey()],
+        ]);
+        // One entry with one tag (50s)
+        TimeEntry::factory()->startWithDuration($start, 50)->create([
+            'tags' => [$tag1->getKey()],
+        ]);
+        // One entry with no tags (25s)
+        TimeEntry::factory()->startWithDuration($start, 25)->create([
+            'tags' => [],
+        ]);
+
+        $query = TimeEntry::query();
+
+        // Act
+        $result = $this->service->getAggregatedTimeEntries(
+            $query,
+            TimeEntryAggregationType::Tag,
+            null,
+            'Europe/Vienna',
+            Weekday::Monday,
+            false,
+            null,
+            null,
+            true,
+            null,
+            null
+        );
+
+        // Assert - overall total should be 175 and groups: null=25, tag1=150, tag2=100
+        $expected = [
+            'seconds' => 175,
+            'cost' => 0,
+            'grouped_type' => 'tag',
+            'grouped_data' => [
+                [
+                    'key' => null,
+                    'seconds' => 25,
+                    'cost' => 0,
+                    'grouped_type' => null,
+                    'grouped_data' => null,
+                ],
+                [
+                    'key' => $tag1->getKey(),
+                    'seconds' => 150,
+                    'cost' => 0,
+                    'grouped_type' => null,
+                    'grouped_data' => null,
+                ],
+                [
+                    'key' => $tag2->getKey(),
+                    'seconds' => 100,
+                    'cost' => 0,
+                    'grouped_type' => null,
+                    'grouped_data' => null,
+                ],
+            ],
+        ];
+        $this->assertEqualsCanonicalizing($expected, $result);
+    }
+
+    public function test_aggregate_time_entries_group_by_project_and_subgroup_tag(): void
+    {
+        // Arrange
+        $project = Project::factory()->create();
+        $tag1 = Tag::factory()->create();
+        $tag2 = Tag::factory()->create();
+        $start = Carbon::now();
+
+        TimeEntry::factory()->startWithDuration($start, 120)->forProject($project)->create([
+            'tags' => [$tag1->getKey()],
+        ]);
+        TimeEntry::factory()->startWithDuration($start, 60)->forProject($project)->create([
+            'tags' => [$tag2->getKey()],
+        ]);
+
+        $query = TimeEntry::query();
+
+        // Act
+        $result = $this->service->getAggregatedTimeEntries(
+            $query,
+            TimeEntryAggregationType::Project,
+            TimeEntryAggregationType::Tag,
+            'Europe/Vienna',
+            Weekday::Monday,
+            false,
+            null,
+            null,
+            true,
+            null,
+            null
+        );
+
+        // Assert
+        $expected = [
+            'seconds' => 180,
+            'cost' => 0,
+            'grouped_type' => 'project',
+            'grouped_data' => [
+                [
+                    'key' => $project->getKey(),
+                    'seconds' => 180,
+                    'cost' => 0,
+                    'grouped_type' => 'tag',
+                    'grouped_data' => [
+                        [
+                            'key' => $tag1->getKey(),
+                            'seconds' => 120,
+                            'cost' => 0,
+                            'grouped_type' => null,
+                            'grouped_data' => null,
+                        ],
+                        [
+                            'key' => $tag2->getKey(),
+                            'seconds' => 60,
+                            'cost' => 0,
+                            'grouped_type' => null,
+                            'grouped_data' => null,
+                        ],
+                    ],
+                ],
+            ],
+        ];
+        $this->assertEqualsCanonicalizing($expected, $result);
+    }
+
+    public function test_aggregate_time_entries_group_by_project_and_subgroup_tag_avoids_double_counting(): void
+    {
+        // Arrange
+        $project = Project::factory()->create();
+        $tag1 = Tag::factory()->create();
+        $tag2 = Tag::factory()->create();
+        $start = Carbon::now();
+
+        // One entry with two tags => subgroup rows show both tags, but project total should equal entry duration
+        TimeEntry::factory()->startWithDuration($start, 100)->forProject($project)->create([
+            'tags' => [$tag1->getKey(), $tag2->getKey()],
+        ]);
+
+        $query = TimeEntry::query();
+
+        // Act
+        $result = $this->service->getAggregatedTimeEntries(
+            $query,
+            TimeEntryAggregationType::Project,
+            TimeEntryAggregationType::Tag,
+            'Europe/Vienna',
+            Weekday::Monday,
+            false,
+            null,
+            null,
+            true,
+            null,
+            null
+        );
+
+        // Assert
+        $expected = [
+            'seconds' => 100,
+            'cost' => 0,
+            'grouped_type' => 'project',
+            'grouped_data' => [
+                [
+                    'key' => $project->getKey(),
+                    'seconds' => 100,
+                    'cost' => 0,
+                    'grouped_type' => 'tag',
+                    'grouped_data' => [
+                        [
+                            'key' => $tag1->getKey(),
+                            'seconds' => 100,
+                            'cost' => 0,
+                            'grouped_type' => null,
+                            'grouped_data' => null,
+                        ],
+                        [
+                            'key' => $tag2->getKey(),
+                            'seconds' => 100,
+                            'cost' => 0,
+                            'grouped_type' => null,
+                            'grouped_data' => null,
+                        ],
+                    ],
+                ],
+            ],
+        ];
+        $this->assertEqualsCanonicalizing($expected, $result);
+    }
 }