diff --git a/Marco.Pms.Services/Controllers/CollectionController.cs b/Marco.Pms.Services/Controllers/CollectionController.cs
index 9cbd38c..dd829b2 100644
--- a/Marco.Pms.Services/Controllers/CollectionController.cs
+++ b/Marco.Pms.Services/Controllers/CollectionController.cs
@@ -50,7 +50,7 @@ namespace Marco.Pms.Services.Controllers
         #region =================================================================== Get Functions ===================================================================
 
         [HttpGet("invoice/list")]
-        public async Task<IActionResult> GetInvoiceListAsync([FromQuery] string? searchString, [FromQuery] DateTime? fromDate, [FromQuery] DateTime? toDate, [FromQuery] int pageSize = 20, [FromQuery] int pageNumber = 1
+        public async Task<IActionResult> GetInvoiceListAsync([FromQuery] Guid? projectId, [FromQuery] string? searchString, [FromQuery] DateTime? fromDate, [FromQuery] DateTime? toDate, [FromQuery] int pageSize = 20, [FromQuery] int pageNumber = 1
             , [FromQuery] bool isActive = true, [FromQuery] bool isPending = false)
         {
             _logger.LogInfo(
@@ -83,6 +83,13 @@ namespace Marco.Pms.Services.Controllers
                 _logger.LogDebug("Applied search filter with term: {SearchString}", searchString);
             }
 
+            // Apply project filter
+            if (projectId.HasValue)
+            {
+                invoicesQuery = invoicesQuery.Where(i => i.ProjectId == projectId.Value);
+                _logger.LogDebug("Applied project filter with term: {ProjectId}", projectId);
+            }
+
             // Get total count before pagination
             var totalEntites = await invoicesQuery.CountAsync();
             _logger.LogDebug("Total matching invoices: {TotalCount}", totalEntites);