Your AGI is not on your Form W-2. If you are being asked for your AGI to file your 2019 tax return you are being asked for your 2018 AGI Your 2018 AGI is on your 2018 tax return.
If you need a copy of your 2018 tax return follow these steps.
Sign in to TurboTax making sure you're using the same TurboTax account (with the same username) as in prior years.
Select Documents from the navigation when it appears.
Use the drop-down menu at the top of the screen to choose the tax year you want and then select Download PDF.
This link How do I access a prior year return? has additional information that you may find useful.
Also, you can request a transcript of your 2018 tax returns from the IRS. The transcript will have your AGI.
This link to the IRS web site Welcome to Get Transcript has directions on how to obtain a transcript of your tax return.
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