I have a client who took a 403(b) distribution for $90,000 in a check. He then put it in a timely way into a Roth.

How do I fill out what happened so that a Roth conversion can be recognized? I had thought it should be taxed on line 5 of the 1040 and show up on an 8606 p2 on lines 16 and 18. Colleagues says that because it's not an IRA, it shouldn't be on the 8606.

How would you do it? Thanks for your thoughts.