Required Minimum Distribution Calculator and Formula

This calculator estimates a required minimum distribution (RMD) by dividing an eligible retirement account balance by the applicable IRS life-expectancy factor. Enter the account balance and the factor from the correct IRS table; the result is the estimated minimum withdrawal for that year.

Formula

RMD = prior year-end account balance ÷ applicable distribution period. In the calculator, b is the account balance in dollars, usually the balance on December 31 of the preceding year, and f is the applicable distribution factor in years from the IRS table for the account owner’s circumstances. The answer is a dollar amount, rounded here to two decimal places. The example balance and factor are illustrative; the factor is not a universal value.

Worked Example

Using the calculator’s default inputs:

1. Account balance, b = $100,000.
2. Distribution factor, f = 24.6 years.
3. Divide: $100,000 ÷ 24.6 = $4,065.0406…
4. Rounded to two decimal places, the estimated RMD is $4,065.04.

This arithmetic illustrates the method, not the factor an individual should use. Find the correct factor in the applicable IRS table and apply the rules for the specific account and year.

How to Calculate an RMD

An RMD is generally the minimum amount that must be withdrawn each year from certain tax-deferred retirement accounts after the applicable starting age. The calculation is account-specific: the balance is divided by a life-expectancy factor selected under IRS rules. It is not calculated by applying a flat percentage to every account.

• Identify the account and the distribution year.
• Find the account’s balance at the end of the preceding calendar year. For example, an RMD for 2026 is generally based on the December 31, 2025 balance.
• Choose the correct IRS life-expectancy table and locate the factor for the relevant age or beneficiary circumstances.
• Divide the balance by that factor. Calculate separately for each account unless IRS rules allow aggregation for that type of account.

Use the IRS’s current instructions and tables for the year being calculated. A financial institution may provide a calculation, but the account owner remains responsible for ensuring that required distributions are taken correctly.

Choosing the Correct IRS Table

The factor depends on more than the account balance. The IRS generally provides three life-expectancy tables for RMD calculations, and using the wrong one can change the result:

• Uniform Lifetime Table: commonly used by an account owner whose spouse is not the sole beneficiary, or whose sole beneficiary is not more than 10 years younger.
• Joint Life and Last Survivor Expectancy Table: generally used when the owner’s spouse is the sole beneficiary and is more than 10 years younger. The factor reflects both ages.
• Single Life Expectancy Table: used for certain beneficiaries, including many inherited-account situations. The applicable rules depend on when the original owner died and the beneficiary category.

These descriptions are a guide, not a substitute for the detailed IRS rules. Inherited accounts have additional provisions, and some require annual distributions, a deadline to empty the account, or both. Do not assume that the original owner’s factor or table automatically applies to a beneficiary.

Which Accounts and Deadlines Matter?

RMD rules generally cover traditional IRAs and many employer-sponsored retirement plans, including 401(k) and 403(b) plans. Roth IRAs owned by the original account holder are not subject to lifetime RMDs under current federal rules, but inherited Roth accounts can have distribution requirements. Roth accounts in employer plans may also be subject to different rules depending on current law and plan arrangements.

The required beginning date is generally April 1 of the year after the year an account owner reaches the applicable starting age. The age depends on birth year under current law. Waiting until that first April 1 can mean taking two distributions in the same calendar year: the first-year amount by April 1 and the next year’s amount by December 31. Later annual RMDs are generally due by December 31.

Some people still working may be able to delay RMDs from their current employer’s plan, subject to plan terms and ownership rules. That exception generally does not delay RMDs from traditional IRAs or plans with a former employer. Check the rules that apply to each account rather than assuming one deadline covers all retirement savings.

Aggregation, Withdrawals, and Common Errors

Having multiple accounts does not always mean each RMD can be taken from any account. Traditional IRA RMDs may generally be calculated separately and then withdrawn in total from one or more of the owner’s IRAs. Similar aggregation is allowed for certain 403(b) contracts. In contrast, RMDs from many employer plans must generally be taken from each plan separately, and IRA RMDs cannot be satisfied by withdrawing from a 401(k). Inherited accounts also have distinct aggregation rules.

Common mistakes include using the current year-end balance instead of the previous December 31 balance, choosing a factor based on the wrong age or beneficiary status, combining accounts that cannot be aggregated, and confusing an RMD with the amount that must be withdrawn from a particular account. An RMD is a minimum, not a maximum; withdrawing more does not usually count toward a future year’s RMD.

Traditional retirement-account distributions are generally included in taxable income, although the tax treatment depends on the account and individual circumstances. An RMD itself is not an eligible rollover distribution, and moving the money to another retirement account does not satisfy the requirement. A qualified charitable distribution may count toward an IRA RMD if all applicable requirements are met; it is not a general option for every retirement plan.

What the Calculator Does Not Decide

This calculator performs only the division. It cannot determine the correct balance, table, age, beneficiary classification, account aggregation, deadline, or special exception. Those details can alter the required amount. It also does not calculate taxes or decide whether a withdrawal strategy is suitable.

RMD rules can change, and inherited accounts or unusual plan arrangements can be especially complex. Verify the factor and deadline using current IRS publications and the plan or account provider. If a distribution is missed or too small, IRS rules may impose an excise tax, with possible relief in qualifying circumstances; consult the current IRS guidance rather than relying on an outdated penalty figure.

Frequently Asked Questions

What is the basic RMD formula?
Divide the eligible account’s balance at the end of the previous year by the applicable IRS distribution factor. The correct factor depends on the account owner’s age, beneficiary situation, and relevant table.

Which balance do I use for an RMD?
For a distribution year, the usual starting point is the account balance on December 31 of the preceding year. Follow current IRS instructions for adjustments or account-specific situations.

Can I take all my RMDs from one account?
Sometimes. Certain IRA RMDs may be aggregated across the owner’s IRAs, and certain 403(b) rules allow aggregation. Many employer-plan RMDs must be taken from each plan. Verify the rule for each account type.

Does a Roth IRA owner have an RMD?
An original owner generally has no lifetime RMD from a Roth IRA under current federal rules. Beneficiaries of inherited Roth IRAs can still have required distributions.

What happens if I miss an RMD?
A shortfall may trigger an IRS excise tax, though the rate and possible correction relief depend on current law and circumstances. Take action promptly and check current IRS instructions or seek qualified tax guidance.

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in b | Account balance | $ | 100000 | 0
in f | IRS distribution factor | years | 24.6 | 0
out rmd | Required minimum distribution | $ | b / f | 2