What Is Social Security? How It Works, Benefits & Eligibility

Social Security operates as a pay-as-you-go system where current workers' taxes fund current beneficiaries' payments. You earn credits by working and paying Social Security taxes (FICA): in 2024, one credit requires $1,730 in covered earnings, and you can earn up to four credits per year.

The program covers approximately 96% of US workers, including employees, self-employed individuals, and some government workers. Self-employed people pay both the employee and employer portions (12.4% total) through self-employment tax.

Retirement benefits form the largest category. The average retired worker received approximately $1,900 per month in early 2024, though individual amounts vary widely based on earnings history and claiming age.

The program also provides Medicare eligibility at age 65 for most people who qualify for Social Security, creating a linked safety net for healthcare and income in retirement.

Delaying benefits past full retirement age increases your monthly amount by approximately 8% per year until age 70. Someone with an FRA of 67 who waits until 70 receives about 24% more per month than if they had claimed at 67.

The decision involves trade-offs: claiming early means smaller checks for life, while delaying requires other income sources but delivers larger lifetime benefits if you live into your 80s or beyond. Married couples face additional complexity because spousal and survivor benefits factor into the optimal claiming strategy.

The SSA calculates your retirement benefit using your 35 highest-earning years, adjusting those wages for inflation through an index that accounts for average wage growth across the economy. If you worked fewer than 35 years, the formula includes zeros for the missing years, reducing your benefit.

The formula then applies bend points—dollar thresholds where the replacement rate changes—to your AIME. For someone reaching age 62 in 2024, the formula replaces 90% of the first $1,174 of AIME, 32% of AIME between $1,174 and $7,078, and 15% of AIME above $7,078.

Social Security Disability Insurance requires you to have worked recently enough and long enough to earn sufficient credits—the exact number depends on your age when you become disabled, but generally ranges from 20 to 40 credits. You must also have a medical condition that meets SSA's strict definition: the condition must prevent you from doing substantial work (earning over $1,550 per month in 2024), be expected to last at least 12 months or result in death, and be supported by medical documentation.

Survivor benefits extend to multiple family members when a worker dies. A surviving spouse qualifies for reduced benefits as early as age 60 (age 50 if disabled), or at any age if caring for the deceased worker's child under age 16.

Social Security is primarily funded through the 12.4% payroll tax (split equally between workers and employers) on wages up to an annual cap—$168,600 in 2024. Earnings above this threshold aren't taxed for Social Security purposes.

The 2024 Social Security Trustees Report projects the combined trust funds will be depleted around 2035 if Congress makes no changes. At that point, ongoing payroll tax revenue would cover approximately 83% of scheduled benefits.

For current and near-retirees, existing law promises full scheduled benefits through the mid-2030s. Younger workers should plan for potential adjustments while monitoring legislative developments.

Can I collect Social Security if I never worked?

You can potentially receive Social Security spousal benefits if you're married to or divorced from (after 10+ years of marriage) someone who qualifies, or survivor benefits if a qualifying worker dies. You cannot receive benefits based solely on your own record without earning at least 40 work credits through covered employment.

Do I pay taxes on Social Security benefits?

Can I work and collect Social Security at the same time?

Yes, but if you claim before full retirement age and earn above the annual limit ($22,320 in 2024), the SSA withholds $1 in benefits for every $2 earned above the limit. In the year you reach FRA, the limit is higher and the withholding is less.

How do I apply for Social Security benefits?

Apply online through the SSA website, by phone at 1-800-772-1213, or at your local Social Security office. You can apply for retirement benefits up to four months before you want payments to start.