How to get the tax amount in the thank you page in magento

I am trying to get the tax amount to deduct from the total amount or just get the bare subtotal amount so i can put it in an affiliate link but I am not being able to get the tax amount or bare subtotal in the last thank you page after the customer clicks the place order button. I tried: ``` <?php echo $_product->getData('tax_amount'); ?> ``` and ``` $totalItemsInCart = Mage::helper('checkout/cart')->getItemsCount(); //total items in cart $totals = Mage::getSingleton('checkout/session')->getQuote()->getTotals(); //Total object $subtotal = round($totals["subtotal"]->getValue()); //Subtotal value $grandtotal = round($totals["grand_total"]->getValue()); //Grandtotal value if(isset($totals['tax']) && $totals['tax']->getValue()) { $tax = round($totals['tax']->getValue()); //Tax value if present } else { $tax = ''; } echo $tax; ``` but with no luck; I could not get the tax amount I could just get the subtotal with the tax amount.