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.
