Social Security is the largest federal program in the United States. It transfers roughly a trillion and a half dollars annually from current workers to retirees, disabled people, and survivors. Embedded in this enormous transfer system is a quiet but consequential set of rules about marriage: spousal benefits, survivor benefits, divorced-spouse benefits. These rules were designed in the 1930s for a particular kind of household — a single male earner supporting a non-earning wife — and they continue to operate today, mostly unchanged, in an economy where that household structure is a minority.
The basic structure: a worker accumulates Social Security earnings credits over a career, and at retirement claims a benefit based on those earnings. A spouse who has not worked, or who has earned much less, can claim a benefit equal to 50 percent of the worker's benefit at full retirement age — without any contribution of their own. If the worker dies, the surviving spouse can claim 100 percent of the worker's benefit (the survivor benefit), again regardless of the survivor's own earnings record. Divorced spouses can also claim, if the marriage lasted at least ten years, on the ex-spouse's record — without affecting the ex-spouse's benefit. These rules turn marriage into a Social Security entitlement.
The 1939 Amendments to the Social Security Act introduced spousal and survivor benefits. The original 1935 Act had been an individual-earner program — you got out roughly what you put in. By 1939, Congress decided that retirement security required protecting wives and widows, who in the era's typical household had not earned independent benefits. The 1939 design assumed: husbands earned, wives did not, marriage was lifelong, divorce was rare. None of these assumptions hold today. Most wives earn. Many marriages end. Cohabitation is common. The program has been amended at the edges but not redesigned.
The result is a system that produces strange distributional outcomes. A single-earner couple gets 150 percent of one benefit (the worker's 100 percent plus the spouse's 50 percent). A dual-earner couple with the same total earnings, but split equally, gets only 100 percent — each spouse claims on their own record, and neither can also claim a spousal benefit because the spousal benefit is reduced dollar-for-dollar by your own benefit. The single-earner couple is effectively subsidized by the dual-earner couple, even though both contributed the same to the system. This is the same pattern as joint income tax filing — the program is structured for single-earner households and penalizes dual-earner ones.
Survivor benefits compound the asymmetry. When the higher-earning spouse dies, the survivor receives 100 percent of the higher benefit (replacing their lower benefit if any). For a single-earner couple, this means the widow continues to receive 100 percent of the husband's benefit — the same as before, minus the smaller spousal portion. For a dual-earner couple where both spouses earned similar amounts, the survivor sees a much larger drop, because their own benefit is being replaced by something only marginally larger. Widows in single-earner households are well protected; widowed members of dual-earner couples often are not.
Divorced-spouse benefits are a notable feature. If you were married at least ten years, you can claim on your ex-spouse's record at retirement, even if they remarried, even if you are not in contact. The ex-spouse is not notified and does not lose any benefit. This is one of the few remaining policy recognitions that long-term marriages create entitlements that survive the marriage. It is also a benefit many divorced people do not know exists.
Ken Apfel, who served as Commissioner of Social Security under Clinton, has written about the program's marital architecture as a relic that the program has been unable to modernize. Naomi Cahn and June Carbone have called Social Security spousal benefits one of the largest hidden subsidies for traditional marriage in American law. Lily Batchelder has proposed restructuring spousal benefits into individual earned credits for caregiving — recognizing the labor of caregiving without requiring marriage to a wage earner.
The honest summary: Social Security spousal benefits make marriage one of the highest-return financial decisions an American adult can make, particularly for non-earning or low-earning spouses. The system rewards a particular household form and penalizes others. Romantic decisions about marriage are entangled with retirement security in ways most couples do not realize until their fifties, when they begin to read the SSA documents. By then the choices have largely been made.