Sure can! Just have your sister write, in the memo portion of your check, YOUR name and SSN, and 2020 Form ____ (whatever PA's form # is). If you have a voucher that is typically sent with your PA payments, include that voucher, as well.
*** I am NOT a tax expert. I am a seasoned TurboTax user, and volunteer to provide assistance to TT users. Nothing I post is to be considered TAX ADVICE; I bear no legal liability for responses.***
