Yes you can edit the 2023 AGI before filing
To revisit the AGI section in TurboTax Online:
- Sign in and open your return if you haven't already done so.
- From the left menu, select File.
- Select Start next to Step 3 (if needed, revisit Steps 1 and/or 2 to activate Step 3).
- Select I want to e-file.
- Continue until you see where to enter last year's AGI.