Following methods of the Config.php(app/code/core/Mage/Tax/Model) need to be changed as follows to display the product price excluding GST

public function getCategoryPath($sku) { $product = Mage::getModel('catalog/product')->loadByAttribute('sku',$sku); $pathArray = array(); $collection1 = $product->getCategoryCollection() ->setStoreId(Mage::app()->getStore...