The joint life table: both conditions, or neither

Last reviewed 3 August 2026

The short version. Once you reach a certain age, the IRS requires you to take money out of a traditional IRA or 401(k) every year, and the amount is your balance divided by a figure from a table. Almost everyone divides by a figure from the Uniform Lifetime Table. One group divides by a larger figure and so withdraws less: people whose spouse is their sole beneficiary and more than ten years younger. Both conditions, or the ordinary table applies. The difference runs to thousands of dollars a year, and the conditions are checked once a year on a specific date rather than continuously.

What the second table does

A required withdrawal is your balance at the end of last year divided by a divisor. The divisor is roughly a life expectancy, so a larger divisor means a smaller required withdrawal. The Uniform Lifetime Table is built on an assumption applied to everyone: that the money has to last across you and a beneficiary exactly ten years younger — whether or not such a person exists.

The Joint and Last Survivor Table drops that assumption and uses the two actual ages. If your spouse really is much younger than ten years, the money is assumed to need to last longer, the divisor grows, and the required withdrawal falls. The IRS is not doing you a favour; it is removing an assumption that was wrong in your case.

Both conditions have to hold

This is where it goes wrong, because the two conditions are easy to half-meet.

Sole beneficiary. Your spouse must be the only primary beneficiary of that account for the entire year. Naming your spouse and a child, or your spouse and a trust, or splitting 90/10, all fail it — not partially, entirely. Someone who would only inherit if your spouse did not survive you is a different case from a second person entitled alongside them, but where the regulation draws that line depends on how the beneficiary designation is written.
More than ten years younger. Not ten. More than ten. Exactly ten years younger uses the ordinary table, because the ordinary table already assumes a beneficiary ten years younger — there is nothing left to correct.

The ages that matter are the ages you each attain during the calendar year, not your ages on any particular day. Two people born in the same calendar year are the same age for this purpose, however many months apart their birthdays fall.

It is tested once a year, and the answer can change

Both conditions are determined as of January 1 of the distribution year, and the sole-beneficiary condition has to hold for the whole of that year. Two consequences follow that surprise people:

Adding a second primary beneficiary partway through a year can cost you the joint table for that entire year, retroactively — the condition was not met for all of it.
If you divorce, or your spouse dies, during the year, that does not cost you the joint table for that year — the regulation preserves the sole-beneficiary status for the rest of it, and the change takes effect the following year instead. Divorce and death are treated the same way here, in the same sentence of the regulation.

Where this is worth checking rather than assuming. The sole-beneficiary rule has exceptions written into the regulations — for certain trusts where the spouse is the only beneficiary of the trust, and for changes during the year caused by death rather than by a form being signed. If your beneficiary arrangement is anything other than "my spouse, one hundred percent, and it has been that way all year," the answer depends on details this page cannot see.

What it is worth

The gap widens with the age difference. It is not a rounding adjustment: on a large traditional balance, moving from one table to the other changes the required withdrawal by thousands of dollars in a single year, and it repeats every year. That is why the two conditions are worth reading twice.

What the smaller withdrawal is worth to you depends on the rest of your return. A lower required withdrawal is lower taxable income, which can also mean less of your Social Security counted as income and a lower chance of crossing a Medicare threshold — two effects this site has separate pages for. It also means more money left in a traditional account, on which tax has not yet been paid.

One thing calculators quietly get wrong

The joint table does not extend to every combination of ages. When a spouse is young enough to fall outside it, the honest thing is to say so. The calculator on this site falls back to the ordinary table and tells you it did, along with which direction that pushes the figure — the ordinary table gives a smaller divisor and so a larger required amount, which is the safe direction to err in, but it is still not the number your plan administrator may use.

Sources

26 CFR 1.401(a)(9)-5 — the required minimum distribution calculation, and the sole-beneficiary condition
26 CFR 1.401(a)(9)-9 — the life expectancy tables themselves
IRS Publication 590-B — both tables, with worked examples
IRC §401(a)(9) — the statute

Work out your own required withdrawal — it asks whether your spouse is your sole beneficiary and how old they are, picks the table from your answers, and shows you which one it used and why. Also on this site: your retirement timeline, the Social Security calculator, and why the 1959 birth year has two answers.

Estimates and general information only — not tax, investment, or financial advice, and not a substitute for your own tax professional. Not affiliated with the IRS, the Social Security Administration, or any government agency. Whether a particular beneficiary arrangement satisfies the sole-beneficiary condition turns on facts this page cannot see, including the terms of any trust; check your own situation before relying on either table. Tax rules change; check figures against current official materials before acting on them.