AGI is adjusted gross income. PIN is personal identification number. Your PIN is your electronic signature on an electronically filed (e-filed) return. It's any five numbers, other than all zeros, that you choose. Your PIN, your birthdate, and either your prior year's AGI or your prior year's PIN are all required to authenticate your identity.
If you don't have access to your previous year's return, call the IRS at 1-800-829-1040 for your previous year's AGI and PIN.
For more information, go to www.irs.gov/taxtopics. Select Topic 255: Self-Select Pin Signature Method for Online Registration.
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