How to fix last year's Form 8582 1c:last years' allowed losses.

[TaxWDC11229]

I just found out that I didn't report the correct unallowed losses on the 2021 Form.  Do I need to file an amendment to last year's return to making the corrections?  Or can I manually update the current 2022 tax return?

[Mike9241]

maybe your choice. the IRS may never question the beginning amount used for the unallowed passive losses and if it does then you can amend 2021 but that could hold up any refund due for 2022. however, this raises a question that if the unallowed was misreported for 2021 was the allowed misreported - then you need to amend.