The 10-Year Marriage Rule Just Cost Her $1,400 a Month in Social Security. Here’s Why the Calendar Matters

She is 62 years old, recently divorced, and just learning that the calendar made a decision her lawyer never flagged. The marriage lasted nine years and 10 months. The final decree was signed about two months before what would have been their tenth anniversary. On paper, that gap looks small. For Social Security purposes, it is the difference between qualifying for a benefit on her higher-earning ex-husband’s record and qualifying for nothing on it at all.

She had assumed, like many women in her position, that a decade of marriage to a higher earner meant something at retirement. The amount that brought her into a Social Security office was roughly $1,400 a month, the divorced-spouse benefit she expected to be able to claim against his record once she reached full retirement age (FRA). That number is now off the table. Her own work-record benefit, the one based on her own earnings history, is untouched. But the spousal piece she had been counting on is gone, and there is no appeal, no rounding, no partial credit for getting close.

The Hard Line at 10 Years

The Social Security rule for divorced-spouse benefits is unusually rigid. To claim on a former spouse’s record, the marriage must have lasted at least 10 years. Nine years and 11 months is not enough. Nine years and 10 months, her situation, is not enough either. The same 10-year minimum applies to divorced-survivor benefits, which can become relevant later if the ex-spouse dies first.

The duration is measured from the marriage date to the date the divorce becomes final, meaning the decree date a judge signs. It is not measured to the date the couple separated, the date someone moved out, or the date the petition was filed. That distinction matters because couples often separate well before the legal paperwork is finalized, and the Social Security Administration (SSA) only looks at the legal bookends.

Two other conditions apply for the divorced-spouse benefit: the person claiming must be currently unmarried and at least 62 years old. She meets both. The only box she cannot check is the one set by the calendar.

Why does this single rule outweigh almost every other planning detail for someone in her position? Because a divorced-spouse benefit, once earned, is a lifetime stream of income that adjusts each year with inflation. The 2026 cost-of-living adjustment (COLA) is 2.8%, and similar increases compound year after year for as long as she lives. Losing eligibility on the ex’s record removes a stream of payments she might have collected for 20 or 30 years.

How It Reshapes the Rest of Her Plan

Her retirement now leans almost entirely on her own benefit, savings, and any part-time income she chooses to add. The divorced-spouse benefit would have functioned as a floor, the kind of stable monthly check that lets a retiree spend down savings more confidently or delay claiming her own benefit to let it grow. Without it, the roughly $1,400 a month she had been counting on is simply gone. She may need to work longer, withdraw less aggressively in early retirement, or rethink when she files on her own record.

One small piece of good news: because she is unmarried, if her ex-husband had outlived their marriage by even a single additional month before the decree was signed, she would have unlocked both the divorced-spouse benefit now and a potential divorced-survivor benefit later. The rule is all-or-nothing: cross the 10-year line and a lifetime income stream opens up; fall short by a month and it does not.

What People Approaching the Threshold Should Know

For anyone divorcing near the 10-year mark, the decree date is the only date that matters for this boundary. It is worth a conversation with a family-law attorney who understands the Social Security implications before signing anything final.

For those already past 10 years, the door is open. A divorced-spouse benefit becomes available at 62, and a divorced-survivor benefit becomes available later if the ex-spouse dies, even if the ex remarried. The specifics around earnings history, remarriage, and timing are worth confirming directly with the Social Security Administration before making any irreversible move.