diff --git a/includes/class-wc-gzd-coupon-helper.php b/includes/class-wc-gzd-coupon-helper.php
index 5d2eeb5d..fc397970 100644
--- a/includes/class-wc-gzd-coupon-helper.php
+++ b/includes/class-wc-gzd-coupon-helper.php
@@ -357,8 +357,6 @@ public function add_voucher_to_order( $coupon, $order, $fee = false ) {
 		$fee->update_meta_data( '_voucher_id', $coupon_data['id'] );
 
 		$fee->set_tax_status( 'none' );
-
-		// Add a placeholder negative amount to trigger the recalculation in WC_GZD_Discount_Helper::allow_order_fee_total_incl_tax()
 		$fee->set_total( wc_format_decimal( $coupon_data['amount'] ) );
 		$fee->set_total_tax( 0 );
 
diff --git a/includes/class-wc-gzd-order-helper.php b/includes/class-wc-gzd-order-helper.php
index c5c70af5..ea327f81 100644
--- a/includes/class-wc-gzd-order-helper.php
+++ b/includes/class-wc-gzd-order-helper.php
@@ -340,7 +340,7 @@ public function adjust_additional_costs_item_taxes( $item, $calculate_tax_for =
 			$fee_props->tax_class = $item->get_tax_class();
 			$fee_props->taxable   = 'taxable' === $item->get_tax_status();
 			$fee_props->amount    = $item->get_amount();
-			$fee_props->id        = sanitize_title( $fee_props->name );
+			$fee_props->id        = $item->get_meta( '_voucher_id' ) ? sanitize_title( $item->get_meta( '_voucher_id' ) ) : sanitize_title( $fee_props->name );
 			$fee_props->object    = $fee_props;
 
 			if ( ! apply_filters( 'woocommerce_gzd_force_fee_tax_calculation', true, $fee_props ) ) {