Sorry…..I may have given you too much confidence. Sounds like your situation may be like ours. It was JTWROS until we got the jt revocable living trust and community property agreement and retitled into trust. I was under the impression that there was a full basis step up on first death……and perhaps there still is.
However in trying to find a reference for that for you, I ran across some
old messages that at least one person had some doubts.
Perhaps you could go to one of these free living trust seminars and ask
your question there. Or maybe several to make sure you get the same answer.