1. Federal tax return: Your 1040-NR Federal income tax return should be signed by hand in ink (wet signature) on page 2:
2. State tax return: If you also have a State tax return please carefully look for the 'Signature' section. It generally is either on the second page of your State return or last one. Every US state's tax forms differ from one another.
Important: Your tax return should only be signed by hand in ink (wet signature). The IRS does not accept digital signatures.