If you e-filed your tax return you would only need to mail the Form 1040-V payment voucher along with your check or money order.
- Your check or money order should be made out to United States Treasury.
- Make sure these 4 items are on the front the check or money order:
- Social Security number
- Taxpayer's name
- Your mailing address
- Daytime phone number
- Mail the check or money order to the IRS, along with Form 1040-V, postmarked by the April 18, 2017 tax filing deadline to avoid the late payment penalty.
The address to mail your payment will be on your Form 1040-V, or you can get it off the IRS 1040-V instructions (page 2).
As an alternative, you can make an electronic payment online instead of mailing the payment voucher and check. Here is the IRS link to pay online https://www.irs.gov/payments.
@ErikaGP Yes---the reply above is still correct for 2021.
Is this true for 2021 as well?
Yes, if you have federal taxes owed and selected to pay the taxes owed by check. You mail the payment voucher, Form 1040-V, with your check for the taxes owed to the address printed on the 1040-V.