The main amendment was to add in missing 1099-B and 1099-DIV forms (long story on how those were missed...). These added enough previously unreported income that a small 2021 federal refund became an underpayment, and the size of my state refund was smaller.
The same problem that resulted in the missed forms in 2021, also resulted in me owing some federal tax in 2022. In the 2022 return, this popped up questions asking about:
a) 2021 tax liability for Form 2210
b) 2021 Adjusted Gross Income
which displays the old (now incorrect) 2021 information. It seemed I could manually fix these two issues by entered the amended tax liability, but it made me concerned that there were other (less obvious) updates that might need to be made, e.g. to ensure that any 2023 estimated tax payments were done correctly.
