Recalculate taxes when an order's customer details are changed

app/controllers/spree/admin/orders/customer_details_controller.rb

@@ -26,6 +26,7 @@ module Spree
             end
 
             refresh_shipment_rates
+            recalculate_taxes
             OrderWorkflow.new(@order).advance_to_payment
 
             flash[:success] = Spree.t('customer_details_updated')
@@ -47,6 +48,15 @@ module Spree
           @order.shipments.map(&:refresh_rates)
         end
 
+        def recalculate_taxes
+          # If the order's address has been changed, the tax zone could be different,
+          # which means a different set of tax rates might be applicable.
+          @order.create_tax_charge!
+          Spree::TaxRate.adjust(@order, @order.adjustments.admin)
+
+          @order.updater.update_totals_and_states
+        end
+
         def order_params
           params.require(:order).permit(
             :email,