A Required Minimum Distribution (RMD) calculator computes the exact dollar amount the IRS requires you to withdraw each year from your traditional IRA, 401(k), 403(b), SEP-IRA, SIMPLE IRA, and most other tax-deferred retirement accounts once you reach a certain age. Missing or under-taking an RMD triggers one of the harshest penalties in the tax code — 25% of the amount not withdrawn (reduced to 10% if corrected within two years), on top of the ordinary income tax already owed on the distribution.

The IRS mandates RMDs because traditional retirement accounts were funded with pre-tax dollars — the government has deferred its tax claim for decades and ultimately demands its share. Under the SECURE 2.0 Act of 2022, the RMD starting age increased to 73 for individuals who turn 73 on or after January 1, 2023, and will increase further to 75 for those turning 74 after December 31, 2032. Roth IRAs are entirely exempt from RMDs during the original owner's lifetime.

Your first RMD can be delayed until April 1 of the year following the year you turn 73. However, if you delay the first RMD, you must take two distributions in that second year — one for the prior year and one for the current year — which can push you into a higher tax bracket and trigger Medicare IRMAA surcharges. Most financial planners recommend taking the first RMD in the year you turn 73 to avoid this bunching effect.

Who needs this calculator?

• Retirees age 73+ who must compute their annual RMD amount from one or multiple accounts.
• Inherited IRA beneficiaries — the post-SECURE Act rules require most non-spouse beneficiaries to empty the account within 10 years, with some subject to annual RMDs during that window.
• Financial planners and CPAs computing RMDs for multiple clients using year-end account balances.
• Pre-retirees age 65–72 planning Roth conversions to reduce future RMD obligations before they begin.

The calculation is straightforward: divide your prior December 31 account balance by an IRS-published life expectancy factor. But the factor changes every year as you age, and using the wrong table — there are three: Uniform Lifetime, Joint and Last Survivor, and Single Life Expectancy — produces an incorrect RMD. This calculator uses the IRS Publication 590-B Uniform Lifetime Table (the correct table for most owners whose spouse is not the sole beneficiary and is more than 10 years younger).

The RMD formula is deceptively simple but depends on a precise life expectancy factor published annually by the IRS. The updated Uniform Lifetime Table in IRS Publication 590-B (effective 2022 onward, reflecting longer life expectancy assumptions) is the primary table for account owners.

Worked Example — Age 75 with $850,000 Balance:

Suppose you turned 75 in 2025, and your IRA balance on December 31, 2024 was $850,000.

• Age 75 distribution factor = 24.6
• RMD = $850,000 ÷ 24.6 = $34,553
• If your IRA earns 5% in 2025, your December 31, 2025 balance will be approximately ($850,000 − $34,553) × 1.05 = $855,408
• Your 2026 RMD (age 76): $855,408 ÷ 23.7 = $36,091

Notice that the RMD amount rises each year even if the account balance stays flat, because the divisor shrinks as you age. This is by design — the IRS table is calibrated to exhaust the account over your expected remaining lifetime.

Multiple Accounts: If you own multiple traditional IRAs, you calculate a separate RMD for each account but may aggregate them and withdraw the total from any one (or combination) of your IRAs. For 401(k) plans, each plan requires a separate distribution — you cannot satisfy a 401(k) RMD from an IRA or vice versa. The IRS rules on aggregation are explicit on this point.

Qualified Charitable Distribution (QCD) offset: If you are 70½ or older, you can direct up to $108,000 in 2025 from your IRA directly to a qualified charity as a QCD. The QCD counts toward your RMD but is excluded from taxable income — a powerful strategy for charitable retirees in higher brackets.

Follow these steps each year to compute your correct RMD and avoid the 25% excise tax penalty.

1. Determine your age as of December 31 of the distribution year. If you turn 73 on March 15, 2025, your age for the 2025 RMD calculation is 73. The IRS uses your age at year-end, not your age on January 1. Enter your birth year into the calculator and it will compute this automatically.
2. Gather your December 31 account balance from the prior year. Your IRA custodian (Fidelity, Vanguard, Schwab, etc.) will send you a year-end statement or Form 5498 showing the fair market value (FMV) as of December 31. For a 2025 RMD, use the December 31, 2024 balance. Include all accounts of the same type — each traditional IRA gets its own RMD calculated, though you can satisfy the IRA aggregate from one account. Example: IRA #1 balance $400,000, IRA #2 balance $250,000 → total IRA balance for calculation = $650,000.
3. Identify the correct IRS table. Use the Uniform Lifetime Table (Table III in IRS Pub. 590-B) if you are the account owner. Use the Joint and Last Survivor Table only if your spouse is the sole beneficiary and is more than 10 years younger than you — this gives a larger divisor and smaller RMD. Use the Single Life Expectancy Table if you are an inherited IRA beneficiary subject to RMDs.
4. Look up your distribution period factor. Find your age in the Uniform Lifetime Table and note the corresponding factor. For age 73, it is 26.5. For age 80, it is 20.2. Enter this directly into the calculator or allow the calculator to look it up automatically from your birth year.
5. Divide balance by factor. RMD = $650,000 ÷ 26.5 = $24,528 for a 73-year-old with $650,000 in IRAs. This is the minimum you must withdraw by December 31 (or April 1 for your first RMD year — but do not delay for the bracket-stacking reason noted above).
6. Decide your withdrawal strategy. You can take the RMD as a lump sum, monthly installments, or any other schedule — as long as the total amount by December 31 equals or exceeds the required amount. Many retirees set up automatic monthly transfers of 1/12 of their annual RMD to smooth cash flow and avoid a large year-end scramble.
7. Handle tax withholding. RMD distributions are ordinary income. Request withholding of at least 10–20% for federal taxes (or your actual marginal rate) to avoid an underpayment penalty. Use IRS Form W-4R to set withholding instructions with your IRA custodian.
8. Report on your tax return. Your custodian sends Form 1099-R showing the gross distribution. Report the full RMD amount as ordinary income on Form 1040, line 4b (IRA distributions) or 5b (pension/annuity). If you completed a QCD, the exclusion is noted on line 4b with the word "QCD" on the adjacent line.

Your RMD calculator output gives you more than just a single number — it reveals the trajectory of mandatory distributions over your retirement and the tax planning opportunities embedded in that trajectory.

The RMD as a Percentage of Your Balance: At age 73, the RMD equals approximately 3.77% of your balance (1 ÷ 26.5). By age 80, it rises to 4.95%. By age 90, it reaches 8.2%. Compare this to the 4% safe withdrawal rate: in your early 70s, your RMD may actually be less than what you'd voluntarily withdraw under the 4% rule, but by your late 80s the mandated withdrawals substantially exceed most voluntary spending plans, creating taxable income whether you need the cash or not.

Tax Bracket Pressure: Large RMDs push retirees into higher ordinary income tax brackets and trigger Medicare IRMAA surcharges. In 2025, IRMAA adds up to $594/month to Medicare Part B and D premiums for high-income beneficiaries (those with MAGI above $106,000 single / $212,000 MFJ, per Medicare.gov). A large RMD can tip a retiree into an IRMAA bracket and add $3,000–$7,000+ in annual Medicare costs.

Roth Conversion Opportunity: If your projected RMDs will be large relative to your spending needs, consider Roth conversions in the years before RMDs begin (ages 60–72). Converting $50,000/year from traditional to Roth at a 22% rate costs $11,000 in tax but eliminates future RMDs on that converted amount and reduces the tax drag on heirs. A careful 10-year Roth conversion ladder before age 73 can reduce lifetime tax paid by tens of thousands of dollars.

Inherited IRA (Post-SECURE 2.0): Most non-spouse beneficiaries who inherited IRAs after December 31, 2019 must empty the account within 10 years. The IRS ruled in 2024 (after years of uncertainty) that beneficiaries of accounts where the original owner had begun RMDs must take annual RMDs during the 10-year window, not just a lump sum in year 10. This dramatically affects estate and inheritance planning.

Qualified Longevity Annuity Contracts (QLACs): Beginning in 2023, you can invest up to $200,000 (indexed to inflation) of your IRA balance in a QLAC — a deferred income annuity that begins payments at age 85. QLAC funds are excluded from the RMD calculation until payouts begin, reducing near-term RMDs for those who want to defer income to later years.

• Start Roth conversions at 60–72 to reduce future RMD exposure. Every dollar in a Roth IRA is exempt from lifetime RMDs. If your traditional IRA is $1.5 million at age 65, a 7-year Roth conversion strategy of $80,000/year converts $560,000 before RMDs begin, shrinking the first RMD from ~$56,600 to ~$35,472 — saving roughly $21,000 per year in forced taxable income. This strategy is particularly powerful in years between retirement and Social Security claiming when ordinary income is temporarily low.
• Never miss the deadline — December 31 for most, April 1 for first-year only. The 25% excise penalty on a missed RMD is non-negotiable. On a $40,000 RMD, the penalty is $10,000 — plus ordinary income tax on the amount not withdrawn. Set a calendar reminder in November to confirm your distribution has been taken. Most custodians offer automatic RMD programs that calculate and distribute the exact amount each year.
• Use a Qualified Charitable Distribution (QCD) to satisfy RMDs tax-free. In 2025, the QCD limit is $108,000 per person ($216,000 per couple if both have IRAs). A 78-year-old with a $35,000 RMD who donates $35,000 directly from their IRA to charity owes zero income tax on that distribution — effectively donating at a 0% after-tax cost regardless of their tax bracket. This beats a deductible charitable contribution for retirees who already take the standard deduction.
• Aggregate IRA RMDs but not 401(k) RMDs. If you have three traditional IRAs, compute each RMD separately but take the combined total from any single account. This lets you avoid selling appreciated positions in some accounts. However, each 401(k) requires a separate distribution — you cannot use an IRA withdrawal to satisfy a 401(k) RMD. Consolidating multiple 401(k)s into one IRA before RMDs begin simplifies administration significantly.
• If still working at 73+, you may defer your current employer's 401(k) RMD. The "still-working exception" allows participants who are still employed at the sponsoring company and who own less than 5% of the company to defer RMDs from that specific employer's plan until they retire. IRAs and old 401(k)s from prior employers still require RMDs. This rule can save substantial tax for high-income workers who continue working into their 70s.
• Consider a QLAC to reduce early-retirement RMDs. Purchasing a $200,000 QLAC inside your IRA removes that amount from the RMD calculation base. On a $1.2M IRA, a $200,000 QLAC reduces the RMD base to $1.0M — cutting the age-73 RMD from $45,283 to $37,736, a savings of $7,547 in forced income per year until QLAC payments begin at age 85, per IRS QLAC guidance.
• Document IRA basis carefully to avoid double taxation. If you ever made non-deductible contributions to a traditional IRA, those dollars have already been taxed. Track this on IRS Form 8606 — when RMDs include a return of basis, that portion is not taxed again. Ignoring basis tracking causes some retirees to pay thousands in unnecessary taxes.