Normally in magento Price shown including Tax.But if you want to show Price Excluding Tax then you need to call the following helper class.

<?php echo $this->helper('checkout')->formatPrice($_product->getPrice())
// For Special Price write this
echo $this->helper('checkout')->formatPrice($_product->getSpecialPrice()) ?>

from:https://aniscartujo.com/webproxy/default.aspx?prx=http://xhtmlandcsshelp.blogspot.com/2010/11/magento-get-product-price-excluding-tax.html&rct=j&q=magento get price with tax&ei=POgsTp-6MsfkmAX75oW6Dw&usg=AFQjCNFlb3V9Uo985dCZv7LufYJ6ZAdISQ&sig2=4yO-MyZ_4miT7AIfyWN7nw&cad=rja