If you e-filed your federal tax return and it was accepted then you do not have to mail in the Form 1040. You just need to mail the 1040V with your check or money order and make sure your Social Security number is on the form and on the check. Use a mailing service that will track it so you will have assurance that the IRS received it, since it could take awhile before they cash the check.
And of course if you want to pay on the IRS site you can do that instead of mailing a check.
https://www.irs.gov/payments
**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.**
