if you e-Filed last year and chose a 5-digit PIN , and kept it around, you can use that instead.
If you don't have the AGI, AGI = zero works in some situations.
You can ask the IRS for a transcript that will show your AGI.
If you have a credit history and a phone, you can get it online at www.irs.gov
Otherwise, you can file on paper via US Mail.
