@DanaB27 thanks so much for your reply.
On Issue #1 -- I went back into my 2020 return on TurboTax online (via the "Amend my Return" option) and followed the steps you stated. There's another step that shows up after your #7, and that is it asks me to enter my total basis as of December 31, 2019. I have "0" entered right now. In the paragraph it says that if you "never filed a Form 8606, just enter 0". I did not file a Form 8606 for tax year 2019. After this question it asks me "Is this a repayment of a retirement distribution" to which I answered No. Then the program directs me to enter my spouse's IRA contribution (same screens and flow). I wonder if it's the "basis" question that I'm misinterpreting?
Interestingly, the actual text of question #7 in TurboTax is this: "Let us know if [taxpayer] made and kept track of any nondeductible contributions to [taxpayer's] traditional IRA from 2019 or prior years. (This is not common.)" I suspect this is supposed to read "...from 2020 or prior years". I'm not sure if this makes a difference, but pointing it out in case it triggers any new thoughts.
On Issue #2 -- On your #8, TurboTax instructs to "Enter the total value of all [taxpayer's] traditional IRA, SEP, and SIMPLE IRA accounts on December 31, 2021. This information is sent by mail on Form 5498. Do not include ROTH IRAs." I received last year's Form 5498 in June of 2021, and haven't received one yet in 2022. I entered "0" to answer this question, because I have always immediately converted the traditional IRA balance to a Roth IRA.
On line 4b of the previewed 1040 I still show $6,000. Is it the basis question that's throwing this off, or, can you think of something else?
