What Is Social Security? Definition, Benefits & How It Works
A plain-English explanation of Social Security — how the program works, who can receive benefits, Full Retirement Age, payments, taxes, and how SSI differs.
What Is Social Security?
Social Security is a U.S. federal program administered by the Social Security Administration (SSA). It provides benefits to eligible workers and certain family members — most commonly retirement, disability, spouse, and survivor benefits.
SSI (Supplemental Security Income) is different: it is a needs-based program with income and resource rules, not the same as Social Security retirement benefits based on your earnings record.
How Does Social Security Work?
Work → Social Security taxes → earnings record → eligibility → benefit calculation → monthly payments
- Payroll taxes: Covered earnings are taxed to fund the program.
- Work credits: You generally need enough credits to be insured.
- Earnings record: SSA tracks your covered wages over your career.
- Claiming age: When you claim affects the monthly amount.
- Payment schedule: Benefits are typically paid monthly by direct deposit.
Who Can Receive Social Security Benefits?
Depending on the program and rules, benefits may go to retired workers, disabled workers, spouses, eligible former spouses, children/dependents, survivors, and — under separate rules — SSI recipients.
What Are the Main Types of Social Security Benefits?
Retirement Benefits
Monthly benefits for eligible workers who claim based on their own earnings record.
Estimate retirement benefitDisability Benefits (SSDI)
Benefits for workers who meet SSA disability and work-credit rules.
SSDI benefits calculatorSpousal Benefits
Benefits that may be available to a spouse (or eligible former spouse) based on a worker’s record.
Spousal benefits calculatorSurvivor Benefits
Benefits that may be paid to eligible family members after a worker’s death.
Survivor benefits guideFamily Benefits
Auxiliary benefits for eligible children and other dependents under program rules.
How benefits are estimatedSSI
Supplemental Security Income is needs-based and separate from Social Security retirement benefits.
SSI benefits calculatorHow Is Your Social Security Benefit Calculated?
Major factors include lifetime covered earnings, your highest indexed years, work history, claiming age, Full Retirement Age, early-claiming reductions, and delayed retirement credits.
What Is Full Retirement Age?
FRA is when you can receive your unreduced retirement benefit. It depends on birth year.
| Birth year | Full Retirement Age |
|---|---|
| 1943–1954 | 66 |
| 1955 | 66 years, 2 months |
| 1956 | 66 years, 4 months |
| 1957 | 66 years, 6 months |
| 1958 | 66 years, 8 months |
| 1959 | 66 years, 10 months |
| 1960 or later | 67 |
When Can You Start Social Security?
- Earliest retirement claiming age: generally 62
- Full Retirement Age: unreduced benefit age (by birth year)
- Delayed claiming: monthly amount can rise until age 70
Being eligible to claim is not the same as receiving the same amount at every age — claiming age changes the monthly check.
How Are Social Security Payments Made?
Most benefits are paid by direct deposit. Retirement and many SSDI payments follow a birthday-based Wednesday schedule. SSI generally pays around the 1st of the month (with weekend/holiday adjustments). Some cohorts have special schedules.
Open payment scheduleIs Social Security Taxable?
Social Security benefits can be included in taxable income depending on your overall income and filing status. Up to 50% or 85% of benefits may be taxable under IRS rules.
Taxable Social Security Benefits CalculatorSocial Security vs. SSI
| Topic | Social Security | SSI |
|---|---|---|
| Basis | Primarily work history / earnings record | Needs-based (income and resources) |
| Funding | Primarily payroll (FICA) taxes | General federal revenues |
| Programs | Retirement, disability, survivor (and related) | Supplemental income for eligible people |
| Eligibility focus | Program rules tied to work credits / insured status | Income and resource requirements apply |
Social Security and Medicare
Medicare and Social Security are separate programs. Many people become eligible for Medicare around age 65. Medicare premiums can be withheld from Social Security deposits, which can change the amount that hits your bank account — even when the gross benefit is unchanged.
CheckPayDate.com is an independent educational site. This guide is not affiliated with SSA and is not a benefit determination, legal advice, or tax advice.
Frequently asked questions
Related guides & tools
Official Primary Data Sources
Educational overview based on published SSA program concepts.
Overview of retirement benefits, eligibility, and planning tools.
FRA by year of birth.
Early claiming and delayed retirement credits.
Needs-based SSI program overview.
Official SSA calculators and estimators.