RMD Calculator

Suppose you turn 73 this year and your traditional IRA was worth $500,000 on December 31 last year. The IRS Uniform Lifetime Table gives a divisor of 26.5 at age 73, so your required minimum distribution is $500,000 ÷ 26.5 = about $18,868 for the year - roughly 3.8% of the account. That single calculation is what this RMD calculator automates: it pairs your prior year-end balance with the correct divisor for your age and shows the exact dollar amount you must withdraw.

How the RMD is calculated

The required minimum distribution uses one simple division:

The prior year-end balance is the fair market value of the account on December 31 of the previous year. The divisor (also called the distribution period or life-expectancy factor) comes from the IRS Uniform Lifetime Table and depends only on your age. As you get older the divisor shrinks, so the percentage you must withdraw rises each year.

When RMDs start and when they are due

Under current law, RMDs begin at age 73. You may delay your very first RMD until April 1 of the year after you turn 73, but every RMD after that - including the second one - is due by December 31. Delaying the first distribution means taking two RMDs in the same calendar year, which can push you into a higher tax bracket. Many people simply take their first RMD in the year they turn 73 to avoid the double hit.

How to use this calculator

You only need two numbers to get an accurate result:

1. Your age this year: enter the age you turn during the distribution year. If it is below 73, the tool tells you no RMD is due yet.
2. Prior year-end balance: enter the account's fair market value on December 31 of last year - the figure on your year-end statement, not today's balance.
3. Calculate: the tool divides the balance by the Uniform Lifetime Table divisor for your age and shows the dollar RMD, the divisor used, the share of the account, and a monthly equivalent.

The result also lists the divisors for the ages around yours so you can see how next year's required amount is likely to grow.

Who this calculator is for

This tool is built for anyone who needs to take - or plan for - withdrawals from a tax-deferred retirement account. That includes:

• Retirees age 73 and older who must withdraw a minimum amount from an IRA or 401(k) each year.
• People approaching 73 who want to forecast their first RMD and plan the tax impact.
• Anyone with multiple IRAs who needs each account's RMD before deciding which account to draw from.
• Savers doing Roth conversions in their 60s, who want to see how much smaller their future RMDs become if they shrink the pre-tax balance now.
• Family members or advisors double-checking a withdrawal figure against the IRS table.

Key RMD terms explained

• RMD (required minimum distribution): the smallest amount you must withdraw from a tax-deferred account each year once you reach the RMD age.
• Divisor / distribution period: the life-expectancy factor from the IRS table. You divide your balance by it to get the RMD.
• Uniform Lifetime Table: the IRS table most owners use; it assumes a beneficiary 10 years younger than the owner.
• Joint Life and Last Survivor Table: the table you use instead when your sole beneficiary is a spouse more than 10 years younger; it produces a smaller RMD.
• QCD (qualified charitable distribution): a direct transfer from an IRA to charity that can satisfy your RMD while staying out of your taxable income.
• Excise tax: the penalty on any RMD you fail to take - 25% of the shortfall, reduced to 10% if corrected promptly.

A second worked example: age 80

RMDs grow as you age because the divisor falls. Say you are 80 with a $750,000 traditional IRA at last year-end. The Uniform Lifetime Table divisor at 80 is 20.2, so the RMD is $750,000 ÷ 20.2 = about $37,129, or roughly 5.0% of the account - noticeably higher than the 3.8% required at 73. By 90, with a divisor of 12.2, the same $750,000 would require about $61,475, or about 8.2%. The pattern is deliberate: the rules are designed to draw down tax-deferred savings over your expected lifetime.

A third example: balance that has fallen

Because the RMD uses last December's value, a market drop during the year does not lower the amount you must take. Imagine you are 75 with a year-end balance of $400,000; the divisor is 24.6, giving an RMD of about $16,260. Even if the account fell to $360,000 by mid-year, you still must withdraw the full $16,260 - it just represents a larger share of the smaller balance. This is why some retirees take their RMD early in the year and others wait, depending on their view of the market and their cash needs.

What changes the result the most

Two inputs drive the RMD, and a few rules can shift which table or amount applies:

• Account balance: the RMD scales directly with your prior year-end value - a larger balance means a larger required withdrawal.
• Your age: the divisor falls each year, so the required percentage climbs steadily over time.
• A much-younger spouse: a sole-beneficiary spouse more than 10 years younger moves you to the Joint Life table and lowers the RMD.
• Roth balances: Roth IRAs (and now Roth amounts in employer plans) are excluded from lifetime RMDs, so converting can shrink future requirements.
• Inherited accounts: beneficiaries follow separate rules (often a 10-year payout), not the Uniform Lifetime Table used here.

Tips for managing RMDs

• Take it on time: the excise tax on a missed RMD is steep, so calendar the December 31 deadline.
• Mind the first-year timing: deferring the first RMD to April 1 doubles up two RMDs in one year and can spike your taxes.
• Consider a QCD: if you give to charity, a qualified charitable distribution can satisfy the RMD without adding to taxable income.
• Withhold or plan estimates: RMDs are taxable, so arrange withholding or estimated payments to avoid an underpayment penalty.
• Reduce future RMDs early: Roth conversions in lower-income years before 73 shrink the pre-tax balance that future RMDs are based on.

Limitations and assumptions

This calculator is a planning estimate, not tax advice. Keep these assumptions in mind:

• It uses the Uniform Lifetime Table, which applies to most owners but not when a sole-beneficiary spouse is more than 10 years younger.
• It assumes you are the original account owner; inherited IRAs and 401(k)s follow different rules.
• It does not compute income tax on the distribution or any federal or state withholding.
• The embedded table covers ages 72-100; for ages above 100 it uses the age-100 divisor as a placeholder - check the IRS table for the exact factor.
• It does not aggregate multiple accounts or apply the IRA-vs-employer-plan aggregation rules; run each account separately.

How it compares to related calculators

This page answers "how much must I withdraw this year?" If you have a different question, a sister tool fits better:

• To see whether your savings will last through retirement, use the Retirement Calculator.
• To project a 401(k) balance with employer match, use the 401(k) Calculator.
• To estimate tax-free Roth growth (and avoid lifetime RMDs), use the Roth IRA Calculator.
• To model investment growth with contributions, use the Investment Calculator.
• To see how compounding builds the balance an RMD is later based on, use the Compound Interest Calculator.

Sources

• Internal Revenue Service (IRS) - Retirement Plan and IRA Required Minimum Distributions FAQs.
• Internal Revenue Service (IRS) - Publication 590-B, Distributions from IRAs (Uniform Lifetime Table).
• Internal Revenue Service (IRS) - Required Minimum Distribution Worksheets.