Magento Tax Round Issue

Go to app\code\core\Mage\Core\Model\Store.php

Find the following function


 public function roundPrice($price)
    {
        return round($price, 2);
    }

Change to:-


public function roundPrice($price)
    {
        return round($price, 4);
    }



Enjoy..........

magento delete tax rates

DELETE FROM 'tax_calculation_rate';