What Is an RMD Calculator?

Traditional IRAs and workplace plans like 401(k)s grow tax-deferred, but the deferral doesn’t last forever. Once you reach the required beginning age — currently 73 for most account owners — the IRS requires you to withdraw a minimum amount from pre-tax accounts every year and pay income tax on it. That amount is your required minimum distribution (RMD). This calculator estimates it from two inputs: your age and your account’s balance on December 31 of last year. The breakdown shows the life-expectancy factor used and what percentage of your balance the withdrawal represents.

How It Works

For most account owners, the IRS Uniform Lifetime Table assigns each age a distribution period — a divisor that shrinks as you get older. The calculation is a single division:

Because the factor falls each year, the required percentage climbs: at 73 the factor of 26.5 means withdrawing about 3.77% of the balance, while at 90 the factor of 12.2 forces out about 8.2%. Two important caveats: the IRS updates its tables and starting ages periodically — the factors here reflect the table in effect at the time of writing — and a different table applies in some cases, such as when your sole beneficiary is a spouse more than ten years younger. Always confirm against the current IRS publication.

Worked Example: Age 75 With $500,000

Suppose you are 75 at the end of this year and your traditional IRA held $500,000 on December 31 of last year. The Uniform Lifetime Table factor for age 75 is 24.6, so your estimated RMD is $500,000 ÷ 24.6 ≈ $20,325.20 — about 4.07% of the balance. Five years later at 80, the factor drops to 20.2; if the account then held $750,000, the RMD would be about $37,128.71, or roughly 4.95%. You can always withdraw more than the minimum — the rule only sets the floor.

Timing, Multiple Accounts, and Penalties

RMDs are generally due by December 31 each year, with a one-time extension to April 1 of the following year for your very first one. If you own several IRAs, you calculate each RMD separately but may take the total from any combination of them; employer plans like 401(k)s generally require a separate withdrawal from each plan. Miss an RMD and the IRS imposes an excise-tax penalty on the shortfall — the percentage has changed over the years and can sometimes be reduced if corrected promptly, but it’s a costly mistake best avoided entirely. Roth IRAs are generally exempt from lifetime RMDs for the original owner.

Common Mistakes to Avoid

The most common slip is using this year’s balance instead of the prior December 31 balance — the rule looks backward, not at today’s statement. Second, applying the Uniform Lifetime Table when a different IRS table applies to your situation. Third, forgetting that RMDs are ordinary taxable income that can affect Medicare premiums and the taxation of Social Security benefits. Finally, treating an old calculator as gospel: the IRS revises tables and beginning ages periodically. This tool provides educational estimates only and is not financial or tax advice — confirm your actual RMD with the current IRS tables, your plan custodian, or a qualified tax professional.

Frequently Asked Questions