After you file

Yeah, you might need to try a couple ways.

 

Normally, the AGI you use must be the same as for what You & Spouse originally filed, before being Amended.  At least that's what is required for people who file regularly , and only amend for other reasons than completely changing from MFS to MFJ

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Thus, if your original MFS tax returns were actually "Accepted", then you would use the line 11 AGI on each separate MFS 1040 tax return, separate number for each of your respective 2023 AGIs

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But yeah, not sure what happens if you amend to MFJ...might depend on when you amended....

____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*