How Social Security works in the United States

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In the U.S., Social Security is a key part of many retirees’ incomes.

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Social Security is one of the most familiar, yet misunderstood, financial programs in the United States. For many workers, it represents the foundation of retirement income. But there are other aspects of Social Security that may not be as well known, such as disability and survivor benefits. To receive Social Security benefits, applicants must meet requirements specific to the benefit type.

At its core, Social Security is a federal insurance program to replace a portion of workers’ income in retirement or during periods of hardship. Social Security was established in 1935 under the Social Security Act amid the Great Depression to address widespread poverty among older adults. Over time, Social Security in the U.S. expanded to include disability insurance and benefits for surviving family members.

Social Security isn’t a welfare program. Rather, it’s a federally administered social insurance program that provides guaranteed, inflation-adjusted lifetime income.

Social Security operates as a pay-as-you-go system funded primarily by payroll taxes collected under the Federal Insurance Contributions Act (FICA). Employees and employers each contribute a portion of wages through payroll contributions. If you’re self-employed, you generally pay both the employee and employer portions.

There are two main trust funds associated with Social Security, which receive these payroll tax revenues and pay benefits to eligible recipients.

OASI pays Social Security retirement benefits as well as survivor benefits for eligible family members.

Established in 1957, SSDI pays disability benefits to eligible workers, spouses, and children.

Social Security retirement benefits are based on your earnings history and the age at which you claim them. Key factors that affect your benefit amount include:

Lifetime earnings history. Benefits are typically calculated using your highest 35 years of inflation-adjusted earnings to determine your average indexed monthly earnings. If you worked less than 35 years, years with no earnings are counted as zero when calculating your benefit.

Age at which benefits are claimed. You can claim Social Security as early as age 62, but benefits are reduced if you claim before full retirement age (67 for those born in 1960 and later). Delaying benefits increases your monthly payment by about 8% a year, up to age 70.

Working after claiming benefits. Although you can work while receiving retirement benefits, you may end up with a reduction in monthly benefits based on whether you’ve reached full retirement age.

You generally need 40 work credits to receive Social Security retirement benefits, which typically requires about 10 years of work. You can earn up to four credits a year based on your earnings. In 2026, you earn one credit for every $1,890 in wages or self-employment income.

Social Security provides benefits to surviving spouses and children of workers who have died. In some cases, parents may also receive survivor benefits.

Survivor benefits are based on the worker’s benefit amount and vary depending on the survivor’s age and relationship to the worker:

The total amount a family can receive in survivor benefits is capped, typically ranging from about 150% to 180% of the worker’s benefit.

Surviving spouses and children may be eligible for a one-time lump-sum death benefit of $150.

Social Security Disability Insurance (SSDI) provides benefits if a long-term medical condition prevents you from working.

To qualify, you must be unable to do your previous job or adjust to other work because of your medical condition. Your condition must last at least 12 months, or be expected to last that long or result in death.

Social Security maintains a list of medical conditions considered severe enough to qualify automatically. If your condition isn’t on the list, Social Security will evaluate how it affects your ability to work.

Your earnings also matter. If you earn more than a set monthly amount, Social Security generally won’t consider you disabled under its rules. In 2026, if your average monthly earnings exceed $1,690 ($2,380 if you’re blind), you generally are ineligible for SSDI benefits.

An initial disability decision typically takes six to eight months, although some cases can take more than a year.

In addition to meeting Social Security’s medical definition of disability, you must have enough work history to qualify for SSDI.

Most adults need about 40 work credits, with at least 20 earned in the 10 years leading up to disability. Workers who become disabled at younger ages may qualify with fewer credits. For example, a worker under 24 may qualify with six credits earned in the three years before disability.

Social Security is best understood as a financial foundation, not a complete plan. Although it can make up a significant share of income for low- and middle-earners, Social Security often replaces only a portion of preretirement wages.

Survivor benefits can help cushion the loss of income after a worker’s death, and disability benefits provide support when someone can no longer work.

Social Security wasn’t meant to replace all earned income, but it plays an important role in financial planning. The benefits the program provides work best when included as part of a broader mix of savings, life insurance, and disability insurance.