Social Security after divorce: the 10-year rule

If you were married at least ten years, your divorce didn’t end your claim on the other person’s Social Security. This is one of the most underused planning points in divorce — partly because it’s invisible until decades later, partly because attorneys focused on more immediate financial questions don’t always raise it, and partly because the rules sound too good to be true.

What follows is what’s actually available, who qualifies, and how the math works.

The 10-year marriage rule

The threshold most people miss: a marriage that lasted at least ten years before divorce makes the lower-earning ex eligible for spousal Social Security benefits based on the higher earner’s record. The marriage doesn’t have to have been happy. The divorce doesn’t have to have been amicable. The ten years is measured from wedding date to divorce date.

Why this matters: for an ex with a substantially lower lifetime earnings record, the ex-spousal benefit can be meaningfully higher than the benefit they would receive on their own record.

The amount is up to 50% of the ex’s full-retirement-age benefit, reduced if claimed before your own full retirement age. If your own work record produces a higher benefit, you get the higher number — you don’t get to claim both.

What you have to satisfy

The requirements:

• The marriage lasted at least 10 years.
• You are at least 62 years old.
• You are currently unmarried. (Remarriage at age 60 or later doesn’t disqualify the survivor version of the benefit; earlier remarriage usually does — unless that subsequent marriage also ended.)
• The benefit on the ex’s record is higher than the benefit on your own.

If the ex hasn’t yet claimed their own benefit, you can still claim on their record provided you’ve been divorced at least two years and they’re at least 62.

What this is worth

Some concrete numbers. Suppose the higher earner’s full-retirement-age benefit is $3,200/month. The lower earner’s is $1,400/month based on their own work record.

If the lower earner claims at full retirement age on the ex’s record: $1,600/month (50% of $3,200).

Compared to their own benefit of $1,400, that’s an extra $200/month — roughly $50,000+ over a 20-year retirement. The math gets larger as the income disparity gets larger, and smaller as both records converge.

For a stay-at-home parent who never reentered the workforce, the ex-spousal benefit on the higher earner’s record can be the difference between a viable and an unviable retirement.

What happens with remarriage

This is where most surprises happen.

• Remarriage at any age while both spouses are alive generally disqualifies the spousal benefit on a prior ex’s record — unless the new marriage also ends.
• For survivor benefits (after the ex’s death), remarriage at age 60 or later does not disqualify; earlier remarriage usually does, unless that marriage also ended.
• If a subsequent marriage ends (divorce or death), the ex-spousal benefit on the earlier marriage’s record becomes available again.

The interaction of multiple marriages gets complicated. The rule of thumb: if you were married 10+ years and the marriage ended (divorce or death), keep the ex-spousal-benefit option in mind for retirement planning, regardless of later marriages.

Survivor benefits

A different but related benefit, materially better than the spousal benefit.

Many people are unaware they qualify for survivor benefits. If your ex predeceases you, you were married 10+ years, and you’re at least 60, the survivor benefit is on the table — and it’s 100% rather than the spousal 50%.

The decision math during a divorce

Two situations where this changes a decision in the actual divorce:

Marriages near the 10-year mark. If a marriage has been going for 9 years and 10 months when a divorce is filed, the divorce can be finalized at year 10. The ex-spousal-benefit eligibility is large enough that a few months’ delay is often worth it. This calculation should be raised explicitly during the divorce, not discovered later.

Marriages over 10 years. The eligibility exists; it just gets activated decades later. Confirm the marriage date and the divorce date, and keep the records — Social Security will need to confirm the marriage length when the claim is eventually made.

What to do now

A short list:

• Confirm the marriage duration. Marriage certificate, decree date. Document both.
• Get a copy of your Social Security earnings record at ssa.gov/myaccount. Confirm it’s accurate.
• Note the ex-spousal-benefit option in your retirement planning. It isn’t automatic — you have to claim it when the time comes.
• Don’t worry about notifying the ex. Your claim doesn’t affect their benefit; Social Security doesn’t notify them.

When this matters more

A few patterns where the ex-spousal benefit has substantial planning value:

• One spouse with a long career, the other primarily out of the workforce (often the lower earner)
• A long marriage that ended with most of the working years still ahead for both
• Either spouse approaching age 60 or 62 with the marriage just past the 10-year mark
• An older couple in a 20- or 30-year marriage where the income gap is large

What it boils down to

If you were married 10 years or more, you have a Social Security right on the ex’s record. It activates at age 62 (or earlier for disability or survivor cases), is conditional on being unmarried (with exceptions for older remarriage), and can be the difference between a tight retirement and a workable one for the lower earner. Most divorcing parties never raise it. The ones who do tend to be much better off thirty years later.