diff --git a/app/models/spree/order.rb b/app/models/spree/order.rb
index 549f123fa2..2ff4f85317 100644
--- a/app/models/spree/order.rb
+++ b/app/models/spree/order.rb
@@ -183,10 +183,6 @@ module Spree
       Spree::Money.new(adjustment_total, currency: currency)
     end
 
-    def display_tax_total
-      Spree::Money.new(tax_total, currency: currency)
-    end
-
     def display_total
       Spree::Money.new(total, currency: currency)
     end
@@ -377,10 +373,6 @@ module Spree
       adjustments.shipping.sum(:amount)
     end
 
-    def tax_total
-      adjustments.tax.sum(:amount)
-    end
-
     # Creates new tax charges if there are any applicable rates. If prices already
     # include taxes then price adjustments are created instead.
     def create_tax_charge!
diff --git a/app/models/spree/payment/processing.rb b/app/models/spree/payment/processing.rb
index 80d9d2dc0f..08eb305566 100644
--- a/app/models/spree/payment/processing.rb
+++ b/app/models/spree/payment/processing.rb
@@ -175,7 +175,7 @@ module Spree
                     order_id: gateway_order_id }
 
         options.merge!(shipping: order.ship_total * 100,
-                       tax: order.tax_total * 100,
+                       tax: order.additional_tax_total * 100,
                        subtotal: order.item_total * 100,
                        discount: 0,
                        currency: currency)
diff --git a/spec/models/spree/order/adjustments_spec.rb b/spec/models/spree/order/adjustments_spec.rb
index ede6051f38..65c994e255 100644
--- a/spec/models/spree/order/adjustments_spec.rb
+++ b/spec/models/spree/order/adjustments_spec.rb
@@ -16,13 +16,6 @@ describe Spree::Order do
         expect(order.ship_total).to eq 15
       end
     end
-
-    context "#tax_total" do
-      it "should return the correct amount" do
-        allow(order).to receive_message_chain :adjustments, tax: adjustments
-        expect(order.tax_total).to eq 15
-      end
-    end
   end
 
   context "line item adjustments" do