/** * Get tax class id * * @param OnePica_AvaTax_Model_Sales_Quote_Address|Mage_Sales_Model_Order $object * @return int */ protected function _getTaxClassId($object) { if ($object instanceof OnePica_AvaTax_Model_Sales_Quote_Address) { return $object->getQuote()->getCustomerTaxClassId(); } return Mage::getSingleton('customer/group')->load($object->getCustomerGroupId())->getTaxClassId(); }