Magento Batch tax

Magento Batch Tax:-

1)First Create a tax class for products from sales->tax->product tax class.
2)Now provide tax rate for the products from sales->tax->manage tax zones and rates
3)Now you have to create the tax rule, go to sales->tax->tax rules.Provide information according to your requirement.

4) To assign tax class to all the products in one go just open your magento database and run this sql query UPDATE `catalog_product_entity_int` SET `value` =5 WHERE `attribute_id` =274; 

#Here value=5 you can get it from tax class table of your magneto db and attribute id =274 is attribute id of tax class in magento 1.4.1.1 its value is 274 you can check it for you version in your db.