A CP05 notice from the IRS arrives in your mail. That's scary - nobody wants to receive a letter from the IRS. A CP05 notice ...

Withholding ... the tax owed on a Roth conversion with non-IRA funds and request that the custodian withhold 0% from the converted IRA funds. This first appeared in The Kiplinger Tax Letter.

Crucially, those already on a 10% withholding plan will not be affected by the new 100% withholding rate. However tax refund ...

If you've had too much or too little withheld, there's still time to change your tax withholding for the rest of the year (and beyond). But, since you probably only have a couple of pay periods ...