Social Security: Definition, How It Works, and How Benefits Are Calculated
Last updated 05/06/2026 by
Ante Mazalin
Edited by
Andrew Latham
Summary:
Social Security is a federal insurance program that provides retirement, disability, and survivor benefits to eligible workers and their families, funded through payroll taxes paid by employees and employers.
More than 70 million Americans receive Social Security benefits each month.
- Retirement benefits: Workers who accumulate enough credits can collect monthly payments starting as early as age 62, with higher amounts available for delaying until age 70.
- Disability benefits: Workers who become unable to work due to a qualifying medical condition may receive monthly payments through Social Security Disability Insurance (SSDI).
- Survivor benefits: Spouses, children, and dependent parents of deceased workers may qualify for monthly benefits based on the worker’s earnings record.
Social Security is often the largest single source of income in retirement for American households. Understanding how it works, how your benefit is calculated, and when to claim can mean tens of thousands of dollars over your lifetime.
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What Is Social Security?
Social Security is administered by the Social Security Administration (SSA), an independent federal agency. It was established by the Social Security Act of 1935 and has since expanded to cover retirement, disability, and survivor protections for most working Americans.
Benefits are funded through the Federal Insurance Contributions Act (FICA) payroll tax. Employees and employers each pay 6.2% of wages up to the annual taxable wage base ($176,100 in 2025), according to the Social Security Administration. Self-employed individuals pay the full 12.4% through the self-employment tax.
How Social Security Credits Work
Eligibility for Social Security benefits is based on work credits. You earn up to four credits per year based on your income. In 2025, one credit requires $1,810 in earned income.
Most benefits require 40 credits, which equals roughly 10 years of work. Disability benefits require fewer credits, with younger workers needing as few as 6 credits depending on their age at the time they become disabled.
Types of Social Security Benefits
Social Security covers four distinct programs, each serving a different population.
| Program | Who Qualifies | Key Requirement |
|---|---|---|
| Retirement (OASI) | Workers with 40+ credits | Minimum age 62 to start collecting |
| Disability (SSDI) | Workers with qualifying disability who have sufficient work credits | Medical condition expected to last 12+ months or result in death |
| Survivor benefits | Spouses, children, and dependent parents of deceased workers | Based on deceased worker’s earnings record |
| Supplemental Security Income (SSI) | Low-income elderly, blind, or disabled individuals | Based on financial need, not work history |
How Your Retirement Benefit Is Calculated
The SSA calculates your benefit using your 35 highest-earning years, adjusted for inflation. If you worked fewer than 35 years, zeros are averaged in for the missing years, which reduces your benefit.
That average produces your Average Indexed Monthly Earnings (AIME), which is then run through a progressive benefit formula to produce your Primary Insurance Amount (PIA). Your PIA is the benefit you receive at your Full Retirement Age (FRA).
Good to know: You can check your projected Social Security benefit at any time by creating a free account at ssa.gov/myaccount. The statement shows your estimated retirement, disability, and survivor benefits based on your actual earnings record, and it also lists any gaps in your work history.
Full Retirement Age and When to Claim
Full Retirement Age (FRA) is the age at which you receive 100% of your calculated benefit. FRA is 66 years and 10 months for people born in 1959, and 67 for anyone born in 1960 or later.
Claiming before FRA permanently reduces your monthly benefit. Claiming at 62 (the earliest option) reduces it by up to 30%. Delaying past FRA increases your benefit by 8% per year up to age 70, when delayed credits stop accruing.
| Claiming Age | Effect on Benefit (FRA = 67) |
|---|---|
| 62 | Reduced by approximately 30% |
| 65 | Reduced by approximately 13.3% |
| 67 (FRA) | 100% of calculated benefit |
| 70 | Increased by 24% above FRA benefit |
Pro Tip
The break-even point for delaying Social Security from 62 to 67 is typically around age 78 to 80. If you are in good health and expect to live past that age, delaying produces more total lifetime income. If health or financial need requires early claiming, taking benefits at 62 is still far better than not claiming at all.
Social Security and Taxes
Up to 85% of Social Security benefits may be subject to federal income tax, depending on your combined income (adjusted gross income plus nontaxable interest plus half of your Social Security benefits).
If your combined income exceeds $34,000 as a single filer or $44,000 filing jointly, up to 85% of your benefits are taxable. Thirteen states also tax Social Security benefits to varying degrees. Factoring in this tax exposure matters when planning the optimal time to claim.
Social Security and Disability Insurance (SSDI)
SSDI pays monthly benefits to workers who can no longer perform substantial work due to a medically verified impairment. The SSA defines disability strictly: the condition must prevent any significant work and is expected to last at least 12 months or result in death.
Approval rates at the initial application stage run below 30%, according to SSA data. Most approvals occur at the hearing stage after one or more appeals. Workers with private disability insurance alongside SSDI coverage typically have more financial stability during the approval process.
Spousal and Survivor Benefits
A spouse who did not work or had low lifetime earnings can claim a spousal benefit equal to up to 50% of the working spouse’s FRA benefit. This applies even if the claiming spouse never paid into Social Security.
When a worker dies, surviving spouses can claim survivor benefits equal to up to 100% of the deceased’s benefit, beginning as early as age 60. Children under 18 and dependent parents may also qualify. Survivor benefits are separate from retirement benefits, and the rules for each are distinct.
Planning for survivors is an important part of retirement income strategy. Reviewing life insurance options alongside Social Security survivor benefits helps ensure adequate coverage for dependents.
Related reading on retirement and benefits
- Disability insurance — how private disability coverage works alongside SSDI during the application waiting period and after approval.
- Federal income tax — how income thresholds determine what percentage of your Social Security benefits are taxable each year.
- Consumer Price Index (CPI) — the inflation measure used to calculate Social Security’s annual cost-of-living adjustments for benefit recipients.
- Financial aid — how Social Security income is treated in need-based aid calculations for students and dependents.
Frequently Asked Questions
At what age can I start collecting Social Security?
You can begin collecting retirement benefits as early as age 62, but your monthly payment will be permanently reduced compared to waiting until Full Retirement Age (67 for those born in 1960 or later). Delaying past FRA increases your benefit by 8% per year, up to a maximum at age 70.
How much will I receive from Social Security?
Your benefit is based on your 35 highest-earning years, adjusted for inflation. The SSA applies a progressive formula to calculate your Primary Insurance Amount. You can view your personalized estimate at ssa.gov/myaccount using your actual earnings history.
Can I work and collect Social Security at the same time?
Yes, but if you claim benefits before Full Retirement Age while still working, your benefit may be temporarily reduced if your earnings exceed the annual limit ($23,400 in 2025). Once you reach FRA, there is no earnings limit and your benefit is not reduced regardless of how much you earn.
Is Social Security going bankrupt?
Social Security’s trust funds are projected to be depleted around 2033 to 2035 without legislative changes, according to the SSA’s annual trustees report. At that point, incoming payroll tax revenue would cover approximately 75% to 80% of scheduled benefits. Congress has historically intervened before funding shortfalls reached recipients, as it did with reforms in 1983.
Do immigrants qualify for Social Security?
Legal permanent residents and certain visa holders who pay FICA taxes can accumulate work credits and qualify for Social Security retirement and disability benefits. SSI eligibility has additional restrictions for non-citizens. Undocumented workers pay into the system through payroll taxes but are generally not eligible to collect benefits.
Key takeaways
- Social Security provides retirement, disability, and survivor benefits funded by FICA payroll taxes paid by workers and employers.
- Eligibility for retirement benefits requires 40 work credits, equivalent to roughly 10 years of employment.
- Full Retirement Age is 67 for anyone born in 1960 or later; claiming at 62 reduces benefits by up to 30%, while delaying to 70 increases them by 24%.
- Up to 85% of Social Security benefits may be subject to federal income tax, depending on your combined income.
- Spouses and survivors can claim benefits based on a worker’s earnings record, even if they never paid into Social Security themselves.
Social Security survivor benefits cover some income gaps, but not always all of them. Compare life insurance policies on SuperMoney to find coverage that fills any gaps in your family’s financial protection.
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