From 47b5a3fb1d014b1aa6e9a5d5bf75fb8cc646487c Mon Sep 17 00:00:00 2001
From: Matt-Yorkley <9029026+Matt-Yorkley@users.noreply.github.com>
Date: Fri, 2 Jun 2023 14:33:51 +0100
Subject: [PATCH] Don't apply tax calculations if there's no tax

---
 app/services/voucher_adjustments_service.rb | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/app/services/voucher_adjustments_service.rb b/app/services/voucher_adjustments_service.rb
index 2569010d95..ccadb8eb75 100644
--- a/app/services/voucher_adjustments_service.rb
+++ b/app/services/voucher_adjustments_service.rb
@@ -19,8 +19,10 @@ class VoucherAdjustmentsService
     # For now we just assume it is either all tax included in price or all tax excluded from price.
     if order.additional_tax_total.positive?
       handle_tax_excluded_from_price(order, amount)
-    else
+    elsif order.included_tax_total.positive?
       handle_tax_included_in_price(order, amount)
+    else
+      adjustment.amount = amount
     end
 
     # Move to closed state