What Is a Required Minimum Distribution?
Tax-deferred retirement accounts let money grow without being taxed year to year, but that deferral doesn’t last forever — eventually the government requires withdrawals to start.
The short answer
A required minimum distribution, or RMD, is the minimum amount that must be withdrawn each year from certain retirement accounts once the account holder reaches an age set by the government and changing over time. It applies mainly to tax-deferred accounts like traditional 401(k)s and traditional IRAs, since those accounts have never been taxed and the government sets a point at which it starts collecting. The withdrawn amount is generally taxed as ordinary income in the year it’s taken.
How it works step by step
The process follows a predictable pattern each year once it applies:
- An age threshold triggers the requirement. Once the account holder crosses that age, RMDs generally must begin, typically with a slightly later deadline allowed for the very first one.
- The amount is calculated using a formula. It’s generally based on the account balance at the end of the previous year divided by a life-expectancy factor from a table published by tax authorities, not an arbitrary number chosen by the account holder.
- Multiple accounts may need separate calculations. Someone with several traditional IRAs, for example, typically has to calculate an RMD for each one, though the total amount owed can sometimes be withdrawn from just one of them.
- The withdrawal counts as taxable income. Because the money was never taxed going in, the distribution is taxed as ordinary income the year it comes out, which can affect the account holder’s tax bracket for that year.
- Missing the deadline carries a penalty. Failing to withdraw the full required amount by the deadline can trigger a penalty on the shortfall, which is one reason people tend to track this closely once it applies.
Who it typically applies to
RMDs mainly affect people who have reached the applicable age and hold tax-deferred accounts such as traditional IRAs or traditional 401(k)s. Roth IRAs, funded with after-tax money, generally aren’t subject to RMDs for the original account holder during their lifetime, which is one reason some people weigh a Roth versus traditional strategy partly around this rule. Inherited retirement accounts have their own separate distribution rules for beneficiaries, which can differ significantly from the original owner’s rules.
A common point of confusion
People sometimes assume RMDs only matter once withdrawals actually begin, but the calculation and deadline exist independent of whether the account holder needs the money. Even someone who doesn’t need the income is still required to withdraw and pay tax on it, which is different from, say, choosing when to tap an emergency fund based on personal timing. Another common mix-up is assuming the RMD amount has to be spent — it doesn’t. Once withdrawn and taxed, the money can be reinvested in a taxable brokerage account if it isn’t needed for expenses.
What to weigh
Because RMDs are calculated on tax-deferred balances and taxed as income, some people think ahead about how account type and withdrawal timing might affect their tax picture in retirement, including through strategies like partial Roth conversions earlier in life. The rules themselves, including the applicable age and calculation details, are set by the government and have changed over time, so it’s worth checking current guidance rather than relying on older figures.
The takeaway
A required minimum distribution is the point at which tax-deferred retirement savings stop being optional to withdraw. Understanding that it’s based on account balance, age, and a government-set formula — rather than personal need — helps explain why it shows up as a fixed planning consideration for many retirees.