Social Security is the foundation of retirement income for most Americans — yet many people reach retirement age without fully understanding how the program works how their benefit is calculated when to claim and how to maximize what they receive. This guide explains Social Security in plain English from how you earn benefits to how to get the most out of the program.
What Is Social Security?
Social Security is a federal insurance program created by the Social Security Act of 1935 and administered by the Social Security Administration — SSA. It provides monthly cash benefits to retired workers disabled workers and the survivors and dependents of deceased workers.
Social Security is funded through payroll taxes. Workers and their employers each pay 6.2 percent of wages — up to the taxable earnings cap of $176,100 in 2026 — into the Social Security Trust Fund. Self-employed workers pay the full 12.4 percent themselves. These contributions earn you Social Security credits that determine your eligibility for benefits.
Social Security is not a savings account. The taxes you pay today fund the benefits of today’s retirees. Your future benefits will be funded by future workers. This pay-as-you-go structure means that the program’s long-term financial health depends on the ratio of workers to retirees — a ratio that has been shrinking as the population ages.
How You Earn Social Security Benefits
To qualify for Social Security retirement benefits you must earn enough work credits by working in jobs covered by Social Security and paying Social Security taxes. In 2026 you earn one work credit for each $1,810 in earnings up to a maximum of four credits per year.
You need 40 work credits — the equivalent of 10 years of work — to qualify for Social Security retirement benefits. Once you have earned 40 credits you are fully insured for retirement benefits regardless of when you claim.
Most jobs in the United States are covered by Social Security. Notable exceptions include some state and local government jobs covered by alternative pension systems — certain railroad workers — and some federal employees hired before 1984.
How Your Social Security Benefit Is Calculated
Your Social Security retirement benefit is based on your lifetime earnings record — specifically your 35 highest-earning years adjusted for inflation. Here is how the calculation works.
Step 1 — Index your earnings
The SSA adjusts your historical earnings for inflation using a wage index. This ensures that wages from earlier years are comparable to wages in recent years.
Step 2 — Calculate your Average Indexed Monthly Earnings — AIME
The SSA averages your 35 highest indexed annual earnings and divides by 12 to get your Average Indexed Monthly Earnings — AIME. If you worked fewer than 35 years the SSA uses zeros for the missing years — which reduces your benefit. Working additional years can increase your benefit by replacing lower-earning years or zeros with higher-earning years.
Step 3 — Apply the benefit formula
The SSA applies a progressive benefit formula to your AIME to calculate your Primary Insurance Amount — PIA. The formula replaces a higher percentage of lower earnings than higher earnings — meaning lower-wage workers receive a higher replacement rate than higher-wage workers.
In 2026 the formula is — 90 percent of the first $1,226 of AIME plus 32 percent of AIME between $1,226 and $7,391 plus 15 percent of AIME above $7,391. The dollar amounts in this formula — called bend points — are adjusted annually for wage growth.
Your Primary Insurance Amount — PIA
The result of this calculation is your Primary Insurance Amount — PIA — which is the monthly benefit you would receive if you claim at exactly your full retirement age.
Full Retirement Age — What It Means and Why It Matters
Your full retirement age — FRA — is the age at which you receive your full Primary Insurance Amount. Your FRA depends on your birth year.
For people born in 1943 through 1954 the FRA is 66. For people born in 1955 through 1959 the FRA gradually increases from 66 and 2 months to 66 and 10 months. For people born in 1960 or later the FRA is 67.
Understanding your FRA is critical because claiming before or after your FRA permanently changes your monthly benefit.
When to Claim — Early Late or At Full Retirement Age
One of the most important Social Security decisions you will make is when to claim. You can claim as early as age 62 or as late as age 70. The age you choose permanently affects your monthly benefit for the rest of your life.
Claiming early — age 62 to full retirement age
You can claim Social Security retirement benefits as early as age 62 — but your benefit will be permanently reduced. For people with an FRA of 67 claiming at 62 reduces the monthly benefit by 30 percent. Claiming at 63 reduces it by 25 percent. Claiming at 64 reduces it by 20 percent. Claiming at 65 reduces it by 13.3 percent. Claiming at 66 reduces it by 6.7 percent.
Early claiming makes sense if you need the income immediately — have a serious health condition that may reduce life expectancy — have no other retirement income sources — or if your spouse has a much higher benefit and you plan to switch to a spousal benefit later.
Claiming at full retirement age
Claiming at your FRA gives you your full Primary Insurance Amount with no reduction. This is the baseline benefit.
Claiming late — after full retirement age
Every month you delay claiming after your FRA increases your benefit by 0.667 percent — or 8 percent per year — up to age 70. Claiming at 70 instead of 67 increases your monthly benefit by 24 percent. After age 70 there is no additional increase for delaying.
Delayed claiming makes sense if you are in good health and expect to live into your 80s or beyond — have other income sources to cover expenses until 70 — want to maximize lifetime income — or want to maximize the survivor benefit for your spouse.
The break-even analysis
The break-even age — the age at which total lifetime benefits from delayed claiming exceed total lifetime benefits from early claiming — is typically around age 80 for most people. If you expect to live beyond 80 delayed claiming generally produces more total lifetime income. If you expect to live a shorter time early claiming may produce more total income.
Social Security and Working
If you claim Social Security before your full retirement age and continue to work your benefits may be temporarily reduced if your earnings exceed certain limits.
In 2026 if you are under full retirement age for the entire year the SSA withholds $1 in benefits for every $2 you earn above $22,320. In the year you reach full retirement age the SSA withholds $1 for every $3 you earn above $59,520 — counting only earnings before the month you reach FRA.
The good news is that withheld benefits are not lost — they are added back to your benefit once you reach full retirement age resulting in a higher monthly payment going forward.
Once you reach full retirement age you can earn any amount without affecting your Social Security benefit.
Spousal Benefits
If you are married you may be eligible for a spousal benefit based on your spouse’s Social Security record — even if you have little or no Social Security earnings history of your own.
The maximum spousal benefit is 50 percent of your spouse’s Primary Insurance Amount — but only if you claim at your own full retirement age. Claiming the spousal benefit early reduces it proportionally.
To receive a spousal benefit you must be at least 62 years old and your spouse must already be receiving Social Security benefits. You cannot claim a spousal benefit before your spouse claims their own benefit.
If you are eligible for both your own retirement benefit and a spousal benefit the SSA pays your own benefit first. If the spousal benefit would be higher the SSA pays the difference as an additional amount.
Divorced spouse benefits
If you were married for at least 10 years and are currently unmarried you may be eligible for a divorced spouse benefit based on your ex-spouse’s record — even if they have remarried. The divorced spouse benefit does not affect your ex-spouse’s benefit or their current spouse’s benefit.
Survivor Benefits
When a Social Security recipient dies their surviving spouse and certain other dependents may be eligible for survivor benefits.
A surviving spouse can receive up to 100 percent of the deceased spouse’s benefit amount if they claim at their own full retirement age. Surviving spouses can claim survivor benefits as early as age 60 — or age 50 if disabled — with a reduction for early claiming.
An important survivor benefit strategy is for the higher-earning spouse to delay claiming as long as possible — up to age 70 — to maximize the survivor benefit available to the lower-earning spouse after the higher earner’s death.
Taxation of Social Security Benefits
Up to 85 percent of your Social Security benefits may be subject to federal income tax depending on your combined income — also called provisional income. Combined income is your adjusted gross income plus nontaxable interest plus half of your Social Security benefits.
If your combined income is below $25,000 for single filers or $32,000 for joint filers your Social Security benefits are not taxed. If your combined income is between $25,000 and $34,000 for single filers or $32,000 and $44,000 for joint filers up to 50 percent of benefits may be taxed. If your combined income exceeds $34,000 for single filers or $44,000 for joint filers up to 85 percent of benefits may be taxed.
Many states also tax Social Security benefits — though an increasing number of states have eliminated or reduced state taxation of Social Security. Check your state’s rules.
How to Apply for Social Security
You can apply for Social Security retirement benefits online at ssa.gov — by phone at 1-800-772-1213 — or in person at your local Social Security office.
The SSA recommends applying three months before you want benefits to begin. Benefits are not retroactive — they begin the month you apply or the month you designate as your start date.
Before applying create a my Social Security account at ssa.gov/myaccount to review your earnings record verify your estimated benefit amounts and explore different claiming scenarios.
Key Resources
- Social Security Administration — ssa.gov — apply online review your earnings record and estimate benefits
- my Social Security — ssa.gov/myaccount — create an account to see your personalized benefit estimates
- SSA Retirement Estimator — ssa.gov/benefits/retirement/estimator.html
- Medicare.gov — medicare.gov — information on how Social Security and Medicare coordinate
- AARP Social Security Resource Center — aarp.org/retirement/social-security
The information in this article is for general informational purposes only and does not constitute legal or financial advice. Social Security rules benefit formulas and earnings thresholds change annually. Always verify current figures with the Social Security Administration at ssa.gov.
Last updated: July 2026