app/code/core/Mage/Tax/Model/Config/Price/Include.php

Go to the documentation of this file.

<?php

class Mage_Tax_Model_Config_Price_Include extends Mage_Core_Model_Config_Data
{
    public function afterSave()
    {
        parent::afterSave();
        Mage::app()->cleanCache('checkout_quote');
    }
}

---