diff --git a/apps/quickbooks_online/utils.py b/apps/quickbooks_online/utils.py
index 8303377b..91d0f238 100644
--- a/apps/quickbooks_online/utils.py
+++ b/apps/quickbooks_online/utils.py
@@ -124,9 +124,13 @@ def get_effective_tax_rates(self, tax_rates):
         effective_tax_rate = 0
         tax_rate_refs = []
         for tax_rate in tax_rates:
-            tax_rate_refs.append(tax_rate['TaxRateRef'])
-            tax_rate_id = tax_rate['TaxRateRef']['value']
-            effective_tax_rate += self.connection.tax_rates.get_by_id(tax_rate_id)['RateValue']
+            if 'TaxRateRef' in tax_rate:
+                tax_rate_refs.append(tax_rate['TaxRateRef'])
+                tax_rate_id = tax_rate['TaxRateRef']['value']
+                tax_rate_by_id = self.connection.tax_rates.get_by_id(tax_rate_id)
+
+            if 'RateValue' in tax_rate_by_id:
+                effective_tax_rate += tax_rate_by_id['RateValue']
 
         return effective_tax_rate, tax_rate_refs