In Website the Catalog price is set with a 3rd party API and that automatically adds the tax amount.

It also shows in the front end but when i try to apply coupon condition based on subtotal the condition does not match .

When i debug i check the Quote object i see subtotal is separated from tax . i tracked it farther and found it is sending the object to


public function validate(Varien_Object $object){
    $address = $object;
    if (!$address instanceof Mage_Sales_Model_Quote_Address) {
        if ($object->getQuote()->isVirtual()) {
            $address = $object->getQuote()->getBillingAddress();
        else {
            $address = $object->getQuote()->getShippingAddress();

    if ('payment_method' == $this->getAttribute() && ! $address->hasPaymentMethod()) {
    return parent::validate($address);

but I am not sure how can i add the tax amount with subtotal when it tries to validate the coupon condition.

Thanks in Advance!!

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