RMD Calculator · Practical guide
RMD Rules When Your Spouse Is More Than 10 Years Younger
A much younger spouse stretches your distribution period, shrinking each year's required withdrawal and its tax bill.
At a glance
The Exception That Lowers Your RMD
Most account owners use the IRS Uniform Lifetime Table, but there is an exception: if your spouse is your sole beneficiary and more than 10 years younger than you, you use the Joint Life and Last Survivor table instead. Its longer distribution periods mean a smaller required withdrawal each year, which lowers your taxable income and leaves more money compounding in the account.
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RMD Calculator
Enter your own values, then compare the result with the examples below.
Results
How Much Smaller? A $500,000 Example
At age 73 the uniform table uses a period of 26.5, producing an RMD of $500,000 ÷ 26.5 = $18,867.92. Under the joint-life approach this calculator models, the period stretches by 3 years to 29.5, dropping the RMD to $500,000 ÷ 29.5 = $16,949.15 — about $1,919 less you are forced to withdraw and pay tax on that year. Select the spouse beneficiary option above to see the comparison with your own numbers.
| Scenario (Age 73, $500,000) | Period | RMD |
|---|---|---|
| Uniform Lifetime Table | 26.5 | $18,867.92 |
| Spouse 10+ years younger | 29.5 | $16,949.15 |
| Annual difference | — | $1,918.77 less |
The Conditions Are Strict
Both requirements must hold for the entire year: your spouse must be the sole beneficiary of the account, and the age gap must exceed 10 full years. If you name a child or trust as co-beneficiary, or your spouse is only 9 years younger, you fall back to the uniform table. Divorcing or your spouse passing away during the year can also change which table applies the following year.
Why It Matters for Planning
A lower RMD is not just a smaller tax bill this year — the money left in the account keeps growing tax-deferred, which compounds meaningfully over a 20-year retirement. Couples in this situation often pair the smaller RMD with partial Roth conversions in low-income years, managing the total tax paid across both lifetimes. As always, confirm your exact figure against the official IRS joint life table or with a tax professional, since this tool uses a simplified approximation.
Frequently Asked Questions
Does the younger-spouse rule apply to inherited IRAs?
No. This rule applies to account owners during their lifetime. A spouse who inherits an IRA has separate options, including treating it as their own or using beneficiary life-expectancy tables.
What if my spouse is exactly 10 years younger?
The exception requires the spouse to be more than 10 years younger. At exactly 10 years you remain on the Uniform Lifetime Table with the standard distribution periods.
Do I need to prove the age difference to anyone?
Your IRA custodian typically asks for beneficiary information including date of birth and applies the correct table when calculating your RMD. Keep beneficiary designations current so the right period is used.
Can I still withdraw more than the reduced RMD?
Yes. The joint life table only lowers the minimum. You can always withdraw more if you need the income, with the extra amount taxed as ordinary income like any traditional IRA distribution.