1 files changed, 7 insertions, 1 deletions
diff --git a/lib/super_good/solidus_taxjar/api_params.rb b/lib/super_good/solidus_taxjar/api_params.rb
index 3d898c3..ca346ff 100644
--- a/lib/super_good/solidus_taxjar/api_params.rb
+++ b/lib/super_good/solidus_taxjar/api_params.rb
@@ -30,7 +30,7 @@ module SuperGood
               transaction_date: order.completed_at.to_formatted_s(:iso8601),
               amount: [order.total - order.additional_tax_total, 0].max,
               shipping: shipping(order),
-              sales_tax: order.additional_tax_total
+              sales_tax: sales_tax(order)
             )
         end
 
@@ -106,6 +106,12 @@ module SuperGood
         def shipping(order)
           SuperGood::SolidusTaxJar.shipping_calculator.(order)
         end
+
+        def sales_tax(order)
+          return 0 if order.total.zero?
+
+          order.additional_tax_total
+        end
       end
     end
   end