diff --git a/app/Http/Requests/Invoice/StoreInvoiceRequest.php b/app/Http/Requests/Invoice/StoreInvoiceRequest.php
index 0cf37f68e6e1..1b8da986af03 100644
--- a/app/Http/Requests/Invoice/StoreInvoiceRequest.php
+++ b/app/Http/Requests/Invoice/StoreInvoiceRequest.php
@@ -73,7 +73,7 @@ class StoreInvoiceRequest extends Request
         $rules['tax_name2'] = 'bail|sometimes|string|nullable';
         $rules['tax_name3'] = 'bail|sometimes|string|nullable';
         $rules['exchange_rate'] = 'bail|sometimes|numeric';
-        $rules['partial'] = 'bail|sometimes|nullable|numeric';
+        $rules['partial'] = 'bail|sometimes|nullable|numeric|gte:0';
         $rules['partial_due_date'] = ['bail', 'sometimes', 'exclude_if:partial,0', Rule::requiredIf(fn () => $this->partial > 0), 'date'];
 
         return $rules;