If you do not have a copy of your 2017 Tax Return, you can order a free transcript online from the IRS by clicking here: Get My Transcript. Your IRS transcript will include your AGI from last year.
*If you did not file a tax return for 2017, you should use -0- as your AGI.
*If you filed jointly in 2017, the AGI amount will be the exact same number for both of you.
*If you Amended your return, use the AGI from your original return, NOT your Amended Return.
For more information, you can check out the TurboTax FAQ link for more details on Finding Your 2017 AGI.