How do I find my Adjusted Gross Income (AGI) for last year's return
If you filed a tax return last year, your adjusted gross income (AGI) will be on your last year's tax return.
If you filed a 1040EZ (this'll be on the upper left corner of your tax return), your AGI will be on line 4 of your tax return.
Form 1040 – AGI will be on Line 37
Form 1040A – AGI will be on Line 21
Form 1040EZ – AGI will be on Line 4
If you didn't file a tax return last year, you can get a PIN from the IRS, which'll act as a substitute.