how to calculate rmds

Quick Answer: How RMDs Are Calculated

At the simplest level, an RMD is calculated with one formula:

RMD = Prior Year-End Retirement Account Balance ÷ IRS Life Expectancy Factor

Most people use the Uniform Lifetime Table factor based on their age for the distribution year. If your spouse is more than 10 years younger and is your sole beneficiary, you typically use the Joint Life and Last Survivor table instead, which usually results in a smaller RMD.

Step-by-Step: How to Calculate Your RMD Correctly

1) Find Your December 31 Account Value

Look up each retirement account's value as of the end of the previous calendar year. This is typically shown on your year-end statement from your IRA custodian or plan administrator.

• For a 2026 RMD, use the account value on 12/31/2025.
• Do not use today's balance or an average balance.
• Use each account's own year-end value for accuracy.

2) Determine Which IRS Table Applies

For most account owners, the Uniform Lifetime Table applies. The divisor (life expectancy factor) decreases with age, which means required withdrawals typically rise as you get older.

• Uniform Lifetime Table: Most account owners.
• Joint Life Table: If spouse is more than 10 years younger and sole beneficiary.
• Inherited IRA rules: Different timelines and methods can apply depending on beneficiary type and date of death.

3) Divide Balance by Factor

Once you have the proper factor, divide your prior year-end balance by that factor. That quotient is your required minimum distribution for the year.

Example: $500,000 balance and a factor of 25.5 gives an RMD of $19,607.84.

4) Repeat for Each Account Type as Needed

Aggregation rules matter:

• Traditional IRAs: You may calculate each separately but usually can withdraw the total IRA RMD from one or more IRAs.
• 401(k), 403(b), and other employer plans: Often require plan-by-plan distributions (exceptions can apply).
• Roth IRAs (original owner): No lifetime RMDs for the original owner.

RMD Start Age (Current Law Snapshot)

The required beginning age changed under SECURE legislation. A practical summary:

Birth Year	General RMD Start Age
1950 or earlier	72
1951–1959	73
1960 or later	75

Your first RMD can usually be delayed until April 1 of the following year, but doing so can result in two taxable distributions in one calendar year.

Worked Examples

Example A: Standard Uniform Table Calculation

Sandra is age 76 in 2026. Her 12/31/2025 IRA balance is $420,000. Uniform Lifetime factor at age 76 is 23.7.

$420,000 ÷ 23.7 = $17,721.52 (estimated RMD)

Example B: Multiple IRAs

Mark has two traditional IRAs valued at $300,000 and $120,000 on 12/31. Total IRA balance is $420,000. If his factor is 24.6:

$420,000 ÷ 24.6 = $17,073.17

He can generally take that full IRA RMD from one IRA or split it across both.

Example C: Manual Factor for Special Case

Priya's spouse is more than 10 years younger and sole beneficiary. She uses the IRS Joint Life table factor from Pub. 590-B. In the calculator above, she enters that factor manually for a better estimate.

Common RMD Mistakes to Avoid

• Using the wrong account value date (must be prior year-end).
• Using the wrong table (Uniform vs Joint Life vs inherited rules).
• Forgetting one account entirely.
• Assuming all plans can be aggregated the same way.
• Waiting until year-end and missing processing deadlines.
• Ignoring tax withholding needs and estimated tax payments.

RMD Deadlines and Penalties

Most annual RMDs are due by December 31 of that year. Your first RMD may have an April 1 grace period in the following year, but that can create a larger taxable income year if two RMDs occur together.

If you miss an RMD, the IRS can impose an excise tax on the shortfall. Penalties may be reduced when corrected quickly and reported properly, but don't rely on that. It's much better to calculate early, schedule the distribution, and keep records.

Frequently Asked Questions

Do Roth IRAs have RMDs?

Not for the original owner during lifetime. Beneficiaries may have distribution requirements.

Can I convert RMD amounts to a Roth IRA?

No. RMD dollars themselves are not eligible for Roth conversion. RMD must come out first.

Are RMDs taxable?

Usually yes, as ordinary income for pre-tax accounts. After-tax basis and account type can change tax treatment, so verify with a tax professional.

Can I satisfy my RMD with a Qualified Charitable Distribution (QCD)?

If eligible, a QCD from an IRA can count toward RMD and may lower taxable income versus taking a normal taxable withdrawal.

Final Checklist Before You Withdraw

• Confirm prior year-end balances for every applicable account.
• Verify your factor from the correct IRS table.
• Run the numbers and double-check calculations.
• Coordinate withholding and tax planning.
• Set reminders early in the year so you don't miss deadlines.

Use the calculator above to get a quick estimate, then confirm with your retirement custodian and tax advisor for your exact filing situation.