"I'm occasionally asked for "last year's AGI"...will that be my new, amended AGI?"
It depends on where the IRS is in migrating data to the e-file system.
I recommend keeping both your original AGI and your new one from the 1040X. Next year, use the 1040X first, and if that gets rejected, use the original AGI. One of the two should work. Sorry that we can't tell you in advance which one the IRS will be checking for.
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