There are now irrevocable trusts that do get a stepped up basis, but you have to read the trust to find out, and know what makes it able to get a stepped up basis. Did the trust have an ein, and file 1041 in past years would be one clue. If never filed a 1041 in past years might indicate it is eligible for stepped up basis. You should call attorney that set up trust. Most irrevocable trusts can be quite complex, and you will need to do a lot of research if your not experienced. you could not get your questions answered here to fill out properly. Just my opinion