When should you take Social Security if your spouse is younger?

Most advice about when to take Social Security is written for one person. Find your break-even age, look at your health, pick a number. For a married couple, and especially a couple where one spouse is several years younger, that approach misses the most important part of the decision.

The question isn't only "how long will I live?" It's "how long will the second of us live?" When there's an age gap, that second life can stretch a long way.

The rule that changes everything

When one spouse dies, the survivor doesn't keep both Social Security checks. They keep the larger of the two, and the smaller one stops.

In most couples, the larger check belongs to the higher earner. That means the age the higher earner chooses to claim doesn't just set their own check. It sets the check their spouse may live on after they're gone.

And when the surviving spouse is younger, "after they're gone" can mean ten, fifteen or twenty years.

What waiting actually buys

You can claim as early as 62 or as late as 70. For anyone born in 1960 or later, full retirement age is 67. Every year you wait past 67, your check grows by 8%, up to age 70. Claim early and it shrinks, permanently.

Here's what that looks like for a higher earner whose check at 67 would be $3,000 a month:

The part most people miss: those extra credits for waiting carry over to the survivor. If this person waits until 70 and dies first, a surviving spouse who has reached their own full retirement age steps up to the $3,720 check, not $3,000.

That's $720 a month, about $8,600 a year, for as long as the survivor lives. Over a fifteen-year widowhood, that's well over $100,000, before the yearly cost-of-living raises that make the gap bigger every year.

Why the age gap matters so much

Picture two couples. In both, the husband is the higher earner and is turning 67.

• Couple A: his wife is also 67.
• Couple B: his wife is 59.

If both husbands live to 82, the wife in Couple A is 82 when she's widowed. The wife in Couple B is 74. Women also tend to live longer than men, so Couple B's wife could easily be living on that survivor check into her nineties. That's a much longer stretch than Couple A's.

For Couple B, the husband's claiming age is less about his own break-even math and more about his wife's income for the last chapter of her life. Waiting often looks very different through that lens.

What about the younger spouse's own benefit?

This is where couples have more flexibility than they think.

If the younger spouse has a smaller benefit of their own, there's often less reason for them to wait. If their spouse dies first, they'll switch to the larger survivor check anyway, so the smaller check may only matter for a limited number of years.

A common pattern looks like this: the lower earner claims earlier, and the higher earner waits. The household gets some income coming in, and the bigger check, the one that has to last for two lifetimes, gets as big as it can.

Two details worth knowing:

• A spousal benefit, the check based on your spouse's work record, is up to half of what your spouse would get at their full retirement age. It doesn't grow when your spouse waits past full retirement age. Only your spouse's own check and the survivor check do.
• To collect a spousal benefit, your spouse has to have already started their own benefit.

When waiting doesn't make sense

Waiting isn't automatically right. It can be the wrong call when:

• Both of you have serious health concerns. The survivor benefit only matters if there's a long survivorship.
• Waiting would drain savings you can't afford to lose. Living on your savings from 67 to 70 is a real cost, and it needs a plan.
• The younger spouse has the larger benefit. Then the logic flips, and it's their claiming age that protects the survivor.

There's also a tax side. The years between when you stop working and when Social Security starts are often the lowest-tax years you'll ever have. Used well, they can be a window to draw down or convert retirement accounts at a low rate. Claiming later can make that window bigger.

The bottom line

If your spouse is younger, don't make the Social Security decision as two separate people. Make it as a household, and give real weight to the check the survivor will live on.

The easiest way to see the trade-off is to run your own numbers. The tools on this page show both checks at different claiming ages, and what happens to the household's income if one of you dies first.