Your 2017 AGI can only be found on your 2017 tax return.  See below for how to find your 2017 return in TurboTax. If you do not have access to your prior year return, you can request a free online transcript of your 2017 tax return from the IRS.  The transcript will include your 2017 AGI amount on it.  Use this link:  IRS Get Transcript