If you owed IRS over a certain amoun, there is a penalty and this generates the estimated tax vouchers . If you do not use them, you will most likely end up paying a penalty again. You can find this penalty right near your tax due. You dont have to use the vouchers . they are to pre pay the txes and avoid a penality. When you file you nextyears taxes there is a place where you put in the payment date and amount and you will get the credt
