The MarketWatch article says the proposed tax bill will apply to all Roth conversions:
The new tax bill on Capitol Hill is going to scrap these conversions for everybody after the end of the year — and, no, not just for those earning more than $400,000 a year.
The bill “prohibits all employee after-tax contributions in qualified plans and prohibits after-tax IRA contributions from being converted to Roth regardless of income level, effective for distributions, transfers, and contributions made after Dec. 31, 2021,” reports the House Ways & Means Committee.
This clause is in addition to the separate steps being taken to crack down on IRAs and Roth IRAs for millionaires, billionaires and those making more than $400,000 a year.
Incidentally, the bill also, separately, ends a practice known as a “backdoor Roth” that was allowing high earners to get around income limits for IRA contributions.
So I guess we will all be eager to read the provisions of the final tax bill as passed.