Thanks for your response. I appreciate your detailed explanation. I knew the numbers as I had manually calculated, but it was frustrating not to get additional taxes in TT per pro rata rule. After your suggestion, everything worked, and both numbers, my manual and TT, matched.
One thing that is different this year from past years in TT in backdoor to ROTH steps is, I always selected, “I moved the money to another retirement account .....” to the question “What did you do with the money from ...”. This year, if I were to choose that answer for my spouse, who never had a basis in IRA in prior years or no 401k rollover, TT shows a "Basis carryover as of 12/31/2023" for Traditional IRA for my spouse. If I were to select " did something else with it (cashed ...)", then no basis in Traditional IRA. I had to select the same way, but had a 401k rollover. This is just FYI, and has nothing to do with my original question.
