Steam Train,
You sound like this issue is in your wheel house. This was a new plan (for 2019) instituted by my company after I went to part-time employment. I had rolled over my old plans, but the new plan withholds 3% from employee pay in a 401(k) and matches it with 9% from the company. The 3% shows up in Box 12 against the notation D. It's a relatively small amount. I don't know why TurboTax is calling it an excess contribution even if it were subject to an RMD - I'm confused about the RMD as well.
Cheers,
Rick44
