If you filed a Married filing joint return with your wife, even if she did not have any income, the AGI you need to use for her would be the one from your joint return. If you need to find your last year's AGI, see the TurboTax help article below:
How do I find last year's AGI?
To correct your last year's AGI and e-file your return:
- Open your return
- Select the File tab
- Continue until you reach the screen that says To continue, select options below
- Enter your corrected AGI in Enter last year's AGI here
- Select Continue and follow the screens until you've re-transmitted your return
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