This is just an update in case someone else runs into this. I just heard from the accountant. Because my father-in-law passed away in 2021, the Schedule k-1 is dated for calendar year 2021. Even though taxes were due April 2021, they didn't file until June 2022. That was the first time I saw the Schedule k-1. Because they've filed the estate's taxes, they can't change the date. As an aside, my father-in-law died very close to Jan 1, and there were no taxes due. If we want to use the deductions on the Schedule k-1 we have to file an amendment to our 2021 tax return.
