I wish to change the tax amount in checkout programmatically I am using following code let me know If I am making any mistake.

$session= Mage::getSingleton("checkout/session");
$quote_id = $session->getQuoteId();
$quote = Mage::getModel("sales/quote")->load($quote_id);
$items = $quote->getAllItems();
foreach($items as $item) { 
  • you use this code inside event observers? Apr 11 '15 at 5:09
  • I am using it in Model file Apr 11 '15 at 5:14
  • ok. Can you try with this event sales_quote_collect_totals_after Apr 11 '15 at 5:30
  • But I want to change this before placing order and only on checkout page Apr 11 '15 at 5:36
  • yes you can the tax with the above events Apr 11 '15 at 5:38

After Long research and trials Finally I come up with this solution.

$finalPrice = $product->getPrice();
    $item = Mage::getSingleton('checkout/session')->getQuote()->getItemByProduct($product);
    $finalprice = $finalPrice - $item->getTaxAmount();
    $quote = Mage::getModel('checkout/session')->getQuote();
    $address = $quote->getShippingAddress();
    if ($address)
    {   $address->setSubtotalInclTax($finalprice);


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