The best way
to find your AGI is on last year’s tax return, follow the instructions here: https://ttlc.intuit.com/questions/1900840-how-do-i-find-last-year-s-agi
If you want
to double check the number on your tax return with the IRS to make sure that
your printed copy is the same as what is on file, you can also request a
transcript here: https://www.irs.gov/individuals/get-transcript If you can’t get your transcript online, you
can also request one by mail.