diff --git a/cmd/cart/checkout_builder.go b/cmd/cart/checkout_builder.go
index 226ed3c..405c353 100644
--- a/cmd/cart/checkout_builder.go
+++ b/cmd/cart/checkout_builder.go
@@ -151,6 +151,7 @@ func BuildAdyenCheckoutSession(grain *cart.CartGrain, meta *CheckoutMeta) (*chec
 			AmountIncludingTax: common.PtrInt64(it.TotalPrice.IncVat),
 			Description:        common.PtrString(it.Meta.Name),
 			AmountExcludingTax: common.PtrInt64(it.TotalPrice.ValueExVat()),
+			TaxAmount:          common.PtrInt64(it.TotalPrice.TotalVat()),
 			TaxPercentage:      common.PtrInt64(int64(it.Tax)),
 		})
 	}