How withholding on an RMD actually works

IRA distributions that are payable on demand, which includes RMDs, are treated as nonperiodic payments. Under the Form W-4R instructions, your payer must withhold at a default 10% rate from the taxable amount unless you enter a different rate on line 2 of Form W-4R. You may enter a higher rate, a lower rate, or "-0-" for no withholding at all (except on payments delivered outside the United States, where the election is restricted).

  • No form, no SSN, or a wrong SSN: the payer must withhold the 10% default and cannot honor a request for less.
  • Your election generally carries forward to future distributions from the same payer. Submit a new Form W-4R to change it.
  • The 10% default is a blunt instrument. The instructions include marginal rate tables precisely because the default often misses. If your actual marginal rate is 22%, a 10% default covers less than half your liability on the distribution.
Withholding is not the same as owing. Withholding is a prepayment, not your final tax. Too little withheld means a balance due at filing and possibly an underpayment penalty unless you made timely estimated tax payments. Too much means an interest-free loan to the IRS until your refund arrives.

Worked example: what 10% leaves behind

The following is a hypothetical illustration with round numbers. Your marginal rate depends on your total income, deductions, and filing status.

Illustration. Your RMD this year is $40,000 and your marginal federal rate on it is 22%. Your actual federal tax on the distribution is about $8,800.

  • Default 10% withholding: $4,000 comes out of the distribution. You still owe about $4,800, due through estimated payments or at filing.
  • Electing 22% on Form W-4R line 2: $8,800 withheld. The distribution covers its own tax; you receive $31,200.
  • Electing -0- and paying estimates: you receive the full $40,000 and send four quarterly estimated payments totaling about $8,800 yourself.
The comparison: withholding is automatic and your election persists; estimates give you control over timing but require four deadlines you must not miss. Many retirees do both: withhold a base rate from the RMD, then true up with one or two estimated payments.

When each approach wins

  • Withholding wins on simplicity. One election, applied automatically, no quarterly deadlines. Useful if the RMD is your main taxable event of the year.
  • Estimated taxes win on precision. If your income is lumpy (a Roth conversion one year, a big capital gain the next), quarterly payments let you match prepayments to reality instead of locking in a flat percentage.
  • The hybrid is common. Withhold at your expected marginal rate from the RMD via Form W-4R, then make estimated payments for anything the withholding missed. If too little was withheld overall, you generally owe the balance at filing and may owe a penalty unless timely estimated payments covered it.
  • Do not forget state tax. Federal Form W-4R does not set your state withholding. Some states mandate it, some leave it voluntary, and a few have no income tax. Your custodian's distribution paperwork usually has a separate state election.
  • QCDs sidestep the whole question. A qualified charitable distribution is excluded from income entirely, so there is no tax to prepay on that portion. See the QCD calculator.

Sources

Frequently asked questions

Is federal tax withheld from RMDs automatically?

For IRAs, yes, at a 10% default, unless you elect otherwise on Form W-4R. The payer must withhold 10% if you submit no form or no valid SSN.

How do I change or stop withholding on my RMD?

File Form W-4R (or your custodian's substitute) with your payer. Line 2 takes a higher rate, a lower rate, or -0- for none. The election generally applies to future distributions too.

Should I use withholding or estimated taxes for my RMD?

Withholding is automatic and persistent; estimates are precise but have four deadlines. Many people withhold a base rate and true up with estimated payments.

Is 10% withholding enough for my RMD?

Often not. If your marginal rate exceeds 10%, the default leaves a balance due, possibly with underpayment penalties. Check the Form W-4R marginal rate tables.

Can I have 100% of my RMD withheld for taxes?

You can elect up to 100% on line 2 for nonperiodic payments. Some retirees cover their whole year's tax bill from a late-year RMD this way. Confirm your custodian accepts it.

What about state tax withholding on RMDs?

State rules vary: mandatory in some states, voluntary in others, nonexistent in states with no income tax. Make the state election separately.

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Disclaimer. Educational purposes only, not tax, legal, or financial advice. Withholding elections and estimated tax requirements depend on your income, filing status, and state. Confirm your Form W-4R election with your custodian and review underpayment rules in IRS Publication 505 with a qualified tax professional. This page describes federal rules; state treatment varies.