You sign your tax return using the Self-Select PIN method.  The Self-Select PIN  method allows taxpayers to electronically sign their individual income tax return by selecting a five-digit personal identification number (PIN). The PIN is any five numbers (except all zeros) that you choose to enter as your electronic signature.  If you are filing a joint return, each taxpayer needs a PIN and each may choose any five numbers. As part of the authentication process, each taxpayer also enters their date of birth, and either their original prior year adjusted gross income (AGI) or their prior year PIN. 

If you need to know the eligibility requirements or  you cannot locate your Prior Year AGI or Prior Year PIN, see Self-Select PIN Method for e-file for additional information.