When paying my federal taxes via check in the mail, what should I include in the physical mail? I have the check (obviously) and the FORM 1040-V Payment Voucher.

[danieldapp]

Anything else?

[VolvoGirl]

That's all if you efiled your return and it was Accepted.  Write your ssn and 2021 1040V on the front and back of the check.

[DoninGA]

That is all you need, the Payment Voucher Form 1040-V and a check.