diff --git a/app/DataMapper/Tax/AU/Rule.php b/app/DataMapper/Tax/AU/Rule.php
index d6536e1a7177..c1d9e7ed218e 100644
--- a/app/DataMapper/Tax/AU/Rule.php
+++ b/app/DataMapper/Tax/AU/Rule.php
@@ -62,7 +62,7 @@ class Rule extends BaseRule implements RuleInterface
     public function taxByType($item): self
     {
 
-        if ($this->client->is_tax_exempt) {
+        if ($this->client->is_tax_exempt || !property_exists($item, 'tax_id')) {
             return $this->taxExempt($item);
         }