diff --git a/Modules/Projects/Filament/Company/Resources/Projects/Tables/ProjectsTable.php b/Modules/Projects/Filament/Company/Resources/Projects/Tables/ProjectsTable.php
index c3f636d30..4c9a28d82 100644
--- a/Modules/Projects/Filament/Company/Resources/Projects/Tables/ProjectsTable.php
+++ b/Modules/Projects/Filament/Company/Resources/Projects/Tables/ProjectsTable.php
@@ -8,12 +8,16 @@
 use Filament\Actions\DeleteAction;
 use Filament\Actions\DeleteBulkAction;
 use Filament\Actions\EditAction;
+use Filament\Forms\Components\CheckboxList;
+use Filament\Notifications\Notification;
 use Filament\Tables\Columns\TextColumn;
 use Filament\Tables\Table;
+use InvalidArgumentException;
 use Modules\Core\Enums\Permission;
 use Modules\Core\Helpers\EnumHelper;
 use Modules\Projects\Enums\ProjectStatus;
 use Modules\Projects\Models\Project;
+use Modules\Projects\Services\ProjectBillingService;
 use Modules\Projects\Services\ProjectService;
 
 class ProjectsTable
@@ -60,6 +64,31 @@ public static function configure(Table $table): Table
                             app(ProjectService::class)->updateProject($record, $data);
                         })
                         ->modalWidth('full'),
+                    Action::make('bill_tasks')
+                        ->label(trans('ip.bill_tasks'))
+                        ->icon('heroicon-o-banknotes')
+                        ->visible(fn () => auth()->user()?->can(Permission::CREATE_INVOICES->value))
+                        ->schema(fn (Project $record) => [
+                            CheckboxList::make('task_ids')
+                                ->label(trans('ip.billable_tasks'))
+                                ->options(app(ProjectBillingService::class)->billableTaskOptions($record))
+                                ->required(),
+                        ])
+                        ->action(function (Project $record, array $data): void {
+                            try {
+                                app(ProjectBillingService::class)->billTasks($record, $data['task_ids'] ?? []);
+
+                                Notification::make()
+                                    ->title(trans('ip.tasks_billed_to_draft_invoice'))
+                                    ->success()
+                                    ->send();
+                            } catch (InvalidArgumentException $e) {
+                                Notification::make()
+                                    ->title($e->getMessage())
+                                    ->danger()
+                                    ->send();
+                            }
+                        }),
                     Action::make('duplicate')
                         ->label(trans('ip.duplicate'))
                         ->icon('heroicon-o-document-duplicate')
diff --git a/Modules/Projects/Services/ProjectBillingService.php b/Modules/Projects/Services/ProjectBillingService.php
new file mode 100644
index 000000000..bec604edf
--- /dev/null
+++ b/Modules/Projects/Services/ProjectBillingService.php
@@ -0,0 +1,135 @@
+<?php
+
+namespace Modules\Projects\Services;
+
+use Illuminate\Support\Facades\DB;
+use InvalidArgumentException;
+use Modules\Invoices\Enums\InvoiceStatus;
+use Modules\Invoices\Models\Invoice;
+use Modules\Invoices\Models\InvoiceItem;
+use Modules\Projects\Enums\TaskStatus;
+use Modules\Projects\Models\Project;
+use Modules\Projects\Models\Task;
+
+class ProjectBillingService
+{
+    /**
+     * Create (or extend) a draft invoice for the project's client with one
+     * invoice item per billable task.
+     *
+     * Only completed tasks that are not yet linked to an invoice item are
+     * billed. When the client already has a draft invoice, the items are
+     * appended to it instead of creating a second draft.
+     */
+    public function billTasks(Project $project, array $taskIds): Invoice
+    {
+        $tasks = $this->billableTasks($project, $taskIds);
+
+        if ($tasks->isEmpty()) {
+            throw new InvalidArgumentException(trans('ip.no_billable_tasks_selected'));
+        }
+
+        return DB::transaction(function () use ($project, $tasks) {
+            $invoice = $this->findOrCreateDraftInvoice($project);
+
+            foreach ($tasks as $task) {
+                $price = (float) ($task->task_price ?? 0);
+
+                $invoice->invoiceItems()->create([
+                    'task_id'     => $task->id,
+                    'item_name'   => $task->task_name,
+                    'description' => $task->description,
+                    'quantity'    => 1,
+                    'price'       => $price,
+                    'discount'    => 0,
+                    'subtotal'    => $price,
+                    'tax_rate_id' => $task->tax_rate_id,
+                ]);
+            }
+
+            $this->refreshTotals($invoice);
+
+            return $invoice->refresh();
+        });
+    }
+
+    /**
+     * The project's completed tasks from the given selection that are not
+     * already on an invoice.
+     */
+    public function billableTasks(Project $project, array $taskIds)
+    {
+        $alreadyBilled = InvoiceItem::query()
+            ->whereIn('task_id', $taskIds)
+            ->pluck('task_id')
+            ->all();
+
+        return $project->tasks()
+            ->whereIn('id', $taskIds)
+            ->where('task_status', TaskStatus::COMPLETED->value)
+            ->whereNotIn('id', $alreadyBilled)
+            ->get();
+    }
+
+    /**
+     * Completed, unbilled tasks of the project — the options offered in the
+     * Bill Tasks selection modal.
+     */
+    public function billableTaskOptions(Project $project): array
+    {
+        $billedTaskIds = InvoiceItem::query()
+            ->whereNotNull('task_id')
+            ->pluck('task_id')
+            ->all();
+
+        return $project->tasks()
+            ->where('task_status', TaskStatus::COMPLETED->value)
+            ->whereNotIn('id', $billedTaskIds)
+            ->pluck('task_name', 'id')
+            ->toArray();
+    }
+
+    protected function findOrCreateDraftInvoice(Project $project): Invoice
+    {
+        $draft = Invoice::query()
+            ->where('customer_id', $project->customer_id)
+            ->where('invoice_status', InvoiceStatus::DRAFT->value)
+            ->latest('id')
+            ->first();
+
+        if ($draft) {
+            return $draft;
+        }
+
+        /*
+         * Drafts may carry a null invoice number — numbering is assigned
+         * when the invoice leaves draft.
+         */
+        return Invoice::query()->create([
+            'company_id'               => $project->company_id,
+            'customer_id'              => $project->customer_id,
+            'user_id'                  => auth()->id(),
+            'invoice_number'           => null,
+            'invoice_status'           => InvoiceStatus::DRAFT->value,
+            'invoice_sign'             => '1',
+            'invoiced_at'              => now(),
+            'invoice_due_at'           => now()->addDays(30),
+            'invoice_discount_amount'  => 0,
+            'invoice_discount_percent' => 0,
+            'item_tax_total'           => 0,
+            'invoice_item_subtotal'    => 0,
+            'invoice_tax_total'        => 0,
+            'invoice_total'            => 0,
+        ]);
+    }
+
+    protected function refreshTotals(Invoice $invoice): void
+    {
+        $subtotal = (float) $invoice->invoiceItems()->sum('subtotal');
+
+        $invoice->update([
+            'invoice_item_subtotal' => $subtotal,
+            'invoice_total'         => $subtotal + (float) ($invoice->invoice_tax_total ?? 0),
+        ]);
+    }
+}
diff --git a/Modules/Projects/Tests/Feature/ProjectBillingTest.php b/Modules/Projects/Tests/Feature/ProjectBillingTest.php
new file mode 100644
index 000000000..f8c9b83a6
--- /dev/null
+++ b/Modules/Projects/Tests/Feature/ProjectBillingTest.php
@@ -0,0 +1,146 @@
+<?php
+
+namespace Modules\Projects\Tests\Feature;
+
+use InvalidArgumentException;
+use Modules\Clients\Models\Relation;
+use Modules\Core\Tests\AbstractCompanyPanelTestCase;
+use Modules\Invoices\Enums\InvoiceStatus;
+use Modules\Invoices\Models\Invoice;
+use Modules\Projects\Enums\TaskStatus;
+use Modules\Projects\Models\Project;
+use Modules\Projects\Models\Task;
+use Modules\Projects\Services\ProjectBillingService;
+use PHPUnit\Framework\Attributes\Group;
+use PHPUnit\Framework\Attributes\Test;
+
+class ProjectBillingTest extends AbstractCompanyPanelTestCase
+{
+    private ProjectBillingService $service;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->actingAs($this->user);
+        $this->service = app(ProjectBillingService::class);
+    }
+
+    #[Test]
+    #[Group('crud')]
+    public function it_bills_completed_tasks_to_a_new_draft_invoice(): void
+    {
+        /* Arrange */
+        $project = $this->createProject();
+        $taskA   = $this->createTask($project, ['task_name' => 'Design', 'task_price' => 100]);
+        $taskB   = $this->createTask($project, ['task_name' => 'Build', 'task_price' => 250.5]);
+
+        /* Act */
+        $invoice = $this->service->billTasks($project, [$taskA->id, $taskB->id]);
+
+        /* Assert */
+        $this->assertSame(InvoiceStatus::DRAFT, $invoice->invoice_status);
+        $this->assertSame($project->customer_id, $invoice->customer_id);
+        $this->assertNull($invoice->invoice_number);
+        $this->assertCount(2, $invoice->invoiceItems);
+        $this->assertEqualsWithDelta(350.5, (float) $invoice->invoice_item_subtotal, 0.001);
+
+        $this->assertDatabaseHas('invoice_items', [
+            'invoice_id' => $invoice->id,
+            'task_id'    => $taskA->id,
+            'item_name'  => 'Design',
+        ]);
+    }
+
+    #[Test]
+    #[Group('crud')]
+    public function it_appends_tasks_to_an_existing_draft_invoice(): void
+    {
+        /* Arrange */
+        $project = $this->createProject();
+        $taskA   = $this->createTask($project, ['task_price' => 100]);
+        $taskB   = $this->createTask($project, ['task_price' => 50]);
+
+        $first = $this->service->billTasks($project, [$taskA->id]);
+
+        /* Act */
+        $second = $this->service->billTasks($project, [$taskB->id]);
+
+        /* Assert */
+        $this->assertSame($first->id, $second->id);
+        $this->assertCount(2, $second->invoiceItems);
+        $this->assertSame(1, Invoice::query()->count());
+    }
+
+    #[Test]
+    #[Group('crud')]
+    public function it_does_not_bill_the_same_task_twice(): void
+    {
+        /* Arrange */
+        $project = $this->createProject();
+        $task    = $this->createTask($project, ['task_price' => 100]);
+
+        $this->service->billTasks($project, [$task->id]);
+
+        /* Assert */
+        $this->expectException(InvalidArgumentException::class);
+
+        /* Act */
+        $this->service->billTasks($project, [$task->id]);
+    }
+
+    #[Test]
+    #[Group('crud')]
+    public function it_rejects_tasks_that_are_not_completed(): void
+    {
+        /* Arrange */
+        $project = $this->createProject();
+        $task    = $this->createTask($project, ['task_status' => TaskStatus::IN_PROGRESS->value]);
+
+        /* Assert */
+        $this->expectException(InvalidArgumentException::class);
+
+        /* Act */
+        $this->service->billTasks($project, [$task->id]);
+    }
+
+    #[Test]
+    #[Group('crud')]
+    public function it_only_offers_completed_unbilled_tasks_as_options(): void
+    {
+        /* Arrange */
+        $project   = $this->createProject();
+        $completed = $this->createTask($project, ['task_name' => 'Done']);
+        $open      = $this->createTask($project, [
+            'task_name'   => 'Open',
+            'task_status' => TaskStatus::OPEN->value,
+        ]);
+        $billed = $this->createTask($project, ['task_name' => 'Billed']);
+        $this->service->billTasks($project, [$billed->id]);
+
+        /* Act */
+        $options = $this->service->billableTaskOptions($project);
+
+        /* Assert */
+        $this->assertSame([$completed->id => 'Done'], $options);
+    }
+
+    private function createProject(): Project
+    {
+        $customer = Relation::factory()->for($this->company)->customer()->create();
+
+        return Project::factory()->for($this->company)->create([
+            'customer_id' => $customer->id,
+        ]);
+    }
+
+    private function createTask(Project $project, array $attributes = []): Task
+    {
+        return Task::factory()->for($this->company)->create(array_merge([
+            'customer_id' => $project->customer_id,
+            'project_id'  => $project->id,
+            'task_status' => TaskStatus::COMPLETED->value,
+            'task_price'  => 100,
+        ], $attributes));
+    }
+}
diff --git a/resources/lang/en/ip.php b/resources/lang/en/ip.php
index e60cf5855..8be994ade 100644
--- a/resources/lang/en/ip.php
+++ b/resources/lang/en/ip.php
@@ -135,6 +135,10 @@
     'default_list_limit'                           => 'Number of Items in Lists',
     'default_notes'                                => 'Default Notes',
     'default_payment_method'                       => 'Default Payment Method',
+    'bill_tasks'                                   => 'Bill Tasks',
+    'billable_tasks'                               => 'Billable Tasks',
+    'tasks_billed_to_draft_invoice'                => 'The selected tasks were added to a draft invoice.',
+    'no_billable_tasks_selected'                   => 'None of the selected tasks can be billed — only completed tasks that are not already invoiced qualify.',
     'default_pdf_template'                         => 'Default PDF Template',
     'default_public_template'                      => 'Default Public Template',
     'default_terms'                                => 'Default Terms',