How required minimum distributions work

A required minimum distribution, usually shortened to RMD, is the minimum that must leave certain retirement accounts after the owner reaches the statutory starting age. The annual identity is:

$$R = \frac{B}{d}$$

$B$ is the account balance at the end of the prior calendar year. $d$ is the life-expectancy factor that applies to the owner for the distribution year. $R$ is the minimum distribution for that account.

For most owners, $d$ comes from the IRS Uniform Lifetime Table, Table III. At age 73 its factor is 26.5. Dividing a $530,000 prior year balance by 26.5 gives $20,000. The distribution is about 3.7736 percent of that balance. At age 75 the factor is 24.6, so the required fraction is larger even though the table still expects many years of distributions.

The factor is not a price and not a number of payments. It is a divisor drawn from a mortality table. That is why 26.5 stays written as 26.5 rather than as currency.

An RMD is a floor. Taking more in one year does not create a credit against a later year's minimum. Taking less leaves a shortfall for that year. The drawdown question is how a portfolio is spent over time. The RMD formula answers only how much tax law requires to leave this year.

SECURE 2.0 changed the starting ages in stages. Under the current United States schedule, people born from 1951 through 1959 generally begin at age 73. People born in 1960 or later generally begin at age 75. The age was raised to 73 starting in 2023, and the age 75 rule is scheduled to begin in 2033.

The first distribution can generally be delayed until April 1 of the year after the starting-age year. Every later distribution is generally due by December 31. Delaying the first one can place the first and second distributions in the same tax year, so the delay changes timing rather than erasing a distribution.

The age for the current distribution year selects the factor, while the previous December 31 selects the balance. Those dates point in opposite directions on purpose. A distribution during the year reduces the account for the next year's calculation, not the balance already fixed for this year's calculation.

Starting age and due date can depend on account type, employment status and plan terms. The governing retirement plan and current IRS instructions establish which rule applies. The formula begins after that classification is settled.

The Uniform Lifetime Table covers most original account owners. There is a narrower exception when the owner's spouse is the sole beneficiary and is more than ten years younger. That case uses the Joint and Last Survivor Table, whose factors reflect both lives.

Inherited accounts are a separate branch. Beneficiaries may use the Single Life Expectancy Table, a deadline that requires the account to be emptied within a stated period, annual distributions within that period, or a combination, depending on the original owner's status and the beneficiary's relationship. An inherited account should not be placed into the owner's Uniform Lifetime Table merely because the beneficiary has reached the same age.

Account type matters as well. Traditional IRAs, SEP IRAs, SIMPLE IRAs and most tax-deferred workplace plan balances enter the RMD system. Roth IRAs have no lifetime RMD for the original owner in the United States. An inherited Roth IRA is inherited property and follows beneficiary rules rather than the original-owner rule.

These distinctions are account classifications before they are arithmetic. The tax-advantaged accounts guide sets the wrappers beside one another. Once the right table and balance are known, the division itself is the easy part.

The minimum is first calculated account by account because each account has its own prior year-end balance. Traditional IRA minimums can generally be added together and taken from one or more traditional IRAs. The same aggregation principle can apply within certain related account groups, but it does not turn every retirement account into one pool.

A workplace plan normally requires its own distribution. An IRA amount generally cannot satisfy a workplace plan amount, and one employer's plan generally cannot discharge another employer's requirement. The practical sequence is to identify every account in scope, calculate each minimum with its applicable factor, then apply only the aggregation rule allowed for that account type.

The distribution itself can be cash or property if the custodian permits an in-kind transfer. The fair value moved out counts toward the minimum and remains exposed to market changes if it lands in a taxable brokerage account. What matters for the RMD is that value left the retirement wrapper.

An RMD cannot be rolled into another tax-deferred account. A distribution above the minimum may be eligible for different treatment, but the required slice is a distribution, not a rollover contribution.

A distribution from a fully pre-tax account is generally included in ordinary taxable income. If a traditional IRA contains nondeductible basis, the taxable share is determined under the pro rata tax rules rather than by choosing to withdraw only the basis. Withholding can be taken from the distribution, but withholding is a payment toward tax and does not change the gross amount counted as distributed.

A qualified charitable distribution can count toward an IRA owner's minimum when its conditions are met, while sending the amount directly to an eligible charity. That route has its own age, account and annual rules. It is a tax treatment layered onto the minimum, not a second RMD formula.

The RMD percentage rises as the table divisor falls. That mechanical rise does not say the portfolio can support the same path after inflation, taxes and market losses. Safe withdrawal rates study how long a drawdown may last. How FIRE numbers work sizes a portfolio from planned spending. Neither replaces the legal minimum, and the legal minimum does not replace either planning calculation.

The account is tax deferred, which means tax was postponed while assets remained inside. The RMD is one mechanism that eventually moves part of that balance back into taxable income.

The two examples use the IRS Uniform Lifetime Table, Table III, for an original owner: age 73 with a 26.5 factor and a $530,000 prior year balance, then age 75 with a 24.6 factor and a $492,000 prior year balance. Each division produces a $20,000 minimum.

That scope keeps the identity visible. A spouse more than ten years younger as sole beneficiary selects another table. An inherited account enters the beneficiary rules. A Roth IRA owned by its original owner has no lifetime RMD in the United States.

The applicable account classification, table, balance date and due date come from current plan records and IRS rules. The arithmetic here is educational material, not financial advice.