The RMD Withholding Strategy: December Money That Counts as Paid in April

Updated August 2, 2026. Quick answer: tax withheld from a distribution in December is treated by law as though it had been paid in equal parts across all four quarterly due dates — including the ones that have already passed. That single rule lets someone who has underpaid all year fix it in a single transaction in the last week of December, with no penalty. An estimated payment made the same day would not do this.

The statute, in full, because the whole strategy is in one sentence

“the amount of the credit allowed under section 31 for the taxable year shall be deemed a payment of estimated tax, and an equal part of such amount shall be deemed paid on each due date for such taxable year, unless the taxpayer establishes the dates on which all amounts were actually withheld, in which case the amounts so withheld shall be deemed payments of estimated tax on the dates on which such amounts were actually withheld”

IRC 6654(g)(1)

Read the structure. The default is ratable — an equal part deemed paid on each due date. The exception runs the other way: the taxpayer may establish the actual dates if that helps them. So the rule is not a loophole being exploited; it is the ordinary treatment of withholding, and estimated payments are the ones dated when they land.

Why this beats writing a cheque

Same money, same day, materially different outcome. That is the whole of it.

The move, in order

1. In November, work out the shortfall — the safe-harbour calculator gives the number.
2. Ask the IRA custodian to withhold that amount from the RMD, as a percentage or a dollar figure. Most allow up to 100% of the distribution.
3. Take the RMD before 31 December, with the withholding applied.
4. Keep the Form 1099-R. The withheld figure carries to your return as tax already paid.

The limits, stated honestly

This is presented online as a trick that always works. It does not, and the failure modes are specific:

• You need an RMD, or at least a distribution, large enough. Withholding comes out of the distribution. To withhold $20,000 you need to distribute at least $20,000 — and if the RMD is smaller you must take more than the minimum, which is itself taxable.
• It does not create money. The gross distribution is income. You are changing the timing and character of a payment, not reducing the tax.
• It can push you into the next bracket or over an IRMAA cliff. A larger distribution taken solely to fund withholding raises the same MAGI that sets your Medicare premium two years later. The cliffs are cliffs, not slopes.
• It is a December move. By the time you know the shortfall precisely, the custodian may need days to process. Late December is not the moment to discover a paperwork requirement.
• If you have already made uneven estimated payments, the interaction gets more complicated and the annualised-income method on Form 2210 may serve you better.

The version that is not a rescue

Used properly this is not an emergency manoeuvre at all — it is a way to run the whole year without quarterly payments. Withhold enough from a single annual distribution and you have satisfied the safe harbour with one transaction and no calendar to keep. For a retiree with an RMD large enough to cover the year’s tax, that is simply a better system than four dates and four cheques.

What it does not replace: knowing which safe-harbour test you are aiming at, since the whole move depends on hitting a number.

The ratable-payment rule is IRC section 6654(g)(1), quoted above in full. Read August 2026. General information, not tax advice — and the bracket and Medicare consequences above are the reason to check the whole picture before taking a distribution larger than required.