Federal tax can be paid by mailing a check or money order with the 1040V voucher that prints out with your tax return or you can go to the IRS site and pay with a debit/credit card:
https://www.irs.gov/payments/direct-pay
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**