Do you mean how to pay your tax due to the IRS or your state? You make out a check payable to the U.S. Treasury for federal and mail it with the 1040V voucher. Use a mailing service that will track it like UPS or certified mail so you know it was received.
https://www.irs.gov/filing/where-to-file-paper-tax-returns-with-or-without-a-payment See the instructions for your state on the state's tax site:
https://ttlc.intuit.com/questions/1901670-how-do-i-contact-my-state-department-of-revenue
**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.**
