You are absolutely right! I did not recognize that TT was already considering those as non-deductible given the retirement plan and MAGI conditions you cited. I...

That is EXACTLY the option I'm looking for, but after several passes through this interview section I have never seen that screen. Any thoughts?

Understood. I have followed those steps, but there is no way for me to identify those 2018 contributions as "non-deductible." The only prompt in the section tha...