diff --git a/src/modules/klarna/klarna-api.ts b/src/modules/klarna/klarna-api.ts
index 90abb99..b7a67a5 100644
--- a/src/modules/klarna/klarna-api.ts
+++ b/src/modules/klarna/klarna-api.ts
@@ -179,6 +179,10 @@ export const createMerchantConfirmationUrl = (
 };
 
 export const calculateTaxRate = (taxAmount: number, netAmount: number) => {
+  if (netAmount === 0 || taxAmount === 0) {
+    return 0;
+  }
+
   return getKlarnaIntegerAmountFromSaleor(Math.round((100 * taxAmount) / netAmount));
 };