diff --git a/app/Ninja/Repositories/InvoiceRepository.php b/app/Ninja/Repositories/InvoiceRepository.php
index 8f14698b8e82..e6404ef538e9 100644
--- a/app/Ninja/Repositories/InvoiceRepository.php
+++ b/app/Ninja/Repositories/InvoiceRepository.php
@@ -1285,8 +1285,8 @@ class InvoiceRepository extends BaseRepository
         $data = $invoice->toArray();
         $fee = $amount;
 
-        if ($invoice->amount > 0) {
-            $fee += round($invoice->amount * $percent / 100, 2);
+        if ($invoice->balance > 0) {
+            $fee += round($invoice->balance * $percent / 100, 2);
         }
 
         $item = [];