The Basic Formula: Your 35 Highest-Earning Years

Social Security adds up your earnings from your 35 highest-earning years of work, adjusts them for inflation, and divides by 420 months. That average becomes your Primary Insurance Amount — the base number the system uses to calculate what you receive each month. If you worked fewer than 35 years, Social Security counts the missing years as zero, which lowers your average. If you worked more than 35 years, only your top 35 count.

The Social Security Administration (SSA) does not count every dollar you earned. There is a wage cap — earnings above a certain threshold in any year do not count toward your benefit. In 2024, that cap was $168,600. Earnings below that cap count in full. This means two people who earned very different amounts might have similar benefits if one earned far above the cap.

The year you were born determines when you reach full retirement age — the age at which you receive 100 percent of your Primary Insurance Amount. For people born between 1943 and 1954, full retirement age is 66. For those born in 1960 or later, it is 67. If you claim before full retirement age, your monthly payment is reduced. If you delay past full retirement age, it increases by roughly 8 percent per year until age 70.

Key Takeaways

  • Your benefit is based on your 35 highest-earning years; years you did not work count as zero unless you worked more than 35 years.
  • Earnings above the annual wage cap (which changes each year) do not count toward your benefit calculation.
  • Claiming before your full retirement age reduces your monthly payment permanently; delaying past full retirement age increases it.
  • The SSA adjusts your earnings for inflation using a formula that weights recent years more heavily than distant ones.
  • You can view your own earnings record and estimated benefit amount on your personal Social Security account at ssa.gov.

How the SSA Adjusts Old Earnings for Inflation

Social Security does not simply add up your raw earnings from 1985 and 2023 side by side. Instead, it adjusts older earnings upward to reflect inflation, so a dollar you earned 30 years ago is counted as if it were worth more in today's money. The SSA uses a two-step process: it applies a national wage index to years before age 60, then counts actual earnings from age 60 onward without adjustment.

The wage index is published each year by the SSA and reflects the average wage paid to all workers in the United States. If the national average wage was $50,000 in 1994 and $65,000 in 2014, the SSA multiplies your 1994 earnings by the ratio of those two numbers. This keeps your older earnings in proportion to what workers were earning at the time, rather than treating them as if they were earned in today's dollars.

This adjustment matters most for people who had a long career with steady wage growth. Someone who earned $20,000 in 1990 and $80,000 in 2020 will have both years counted, but the 1990 earnings will be adjusted upward to reflect the wage growth that happened between then and age 60.

The Bend Points: Why Your Benefit Is Not a Straight Percentage

Social Security does not replace the same percentage of everyone's earnings. Instead, it uses a formula with bend points — dollar thresholds where the replacement rate changes. For someone reaching full retirement age in 2024, the formula was roughly: 90 percent of the first $1,174 of average monthly earnings, plus 32 percent of earnings between $1,174 and $7,078, plus 15 percent of earnings above $7,078.

This means lower earners get a higher percentage of their pre-retirement income replaced by Social Security. A worker who averaged $2,000 per month in earnings might receive $1,200 in benefits — a 60 percent replacement rate. A worker who averaged $8,000 per month might receive $2,500 — a 31 percent replacement rate. The bend points change each year based on the national wage index.

The bend points are why Social Security is sometimes described as progressive: it provides a larger cushion for people with lower lifetime earnings. However, the absolute dollar amount is still higher for higher earners; the percentage is simply lower.

Credits, Work History, and Minimum Requirements

You must have earned enough work credits to receive any Social Security benefit at all. In 2024, you earn one credit for each $1,730 of wages or self-employment income, up to four credits per year. You need 40 credits total to receive retirement benefits — roughly 10 years of work. Younger workers who become disabled or die need fewer credits, depending on their age.

The SSA counts credits based on the year you earned the income, not the year you report it. If you earned $6,920 in 2023, you earned four credits in 2023, even if you did not report it until 2024. Self-employed workers report credits through their tax return; wage earners have credits reported by their employer through payroll taxes.

If you have not worked 35 years, the missing years count as zero in your benefit calculation. If you have not earned 40 credits, you do not receive a retirement benefit at all, though you may receive other benefits (such as spousal or survivor benefits) if a family member has earned enough credits.

How Family Members' Benefits Are Calculated

If you receive Social Security retirement benefits, your spouse, ex-spouse, and children may also receive benefits based on your earnings record. A spouse at full retirement age can receive up to 50 percent of your Primary Insurance Amount. A child under 19 (or 19 if still in high school) can receive up to 50 percent. An ex-spouse can receive benefits on your record if you were married at least 10 years, even if you have remarried.

However, there is a family maximum: the total amount paid to all family members on your record cannot exceed 150 to 180 percent of your Primary Insurance Amount, depending on your birth year. If multiple family members claim, the SSA divides the family maximum among them, which may reduce each person's individual benefit.

A spouse or ex-spouse who claims before full retirement age receives a reduced benefit. A child's benefit ends at 19 (or 22 if disabled before age 22), unless the child is disabled, in which case it continues for life.

What Happens If You Claim Early or Delay

If you claim at 62 — the earliest age for retirement benefits — your monthly payment is permanently reduced. The reduction ranges from about 25 to 30 percent, depending on your birth year. If your full retirement age is 67 and you claim at 62, you lose roughly 30 percent of your Primary Insurance Amount every month for life.

If you delay claiming past your full retirement age, your benefit increases by 8 percent per year until age 70. Someone born in 1957 with a full retirement age of 66 who delays until 70 receives roughly 132 percent of their Primary Insurance Amount each month. After age 70, the benefit no longer increases, so there is no financial advantage to delaying further.

The trade-off between claiming early and delaying is a break-even calculation: if you live longer, delaying pays more over your lifetime. If you live a shorter time, claiming early pays more. The SSA publishes life expectancy tables, but individual circumstances vary widely.

How Earnings After Claiming Affect Your Benefit

If you claim before full retirement age and continue working, the SSA reduces your benefit by $1 for every $2 you earn above an annual threshold. In 2024, that threshold was $23,400. If you earn $30,000 and the threshold is $23,400, you are $6,600 over, so your benefit is reduced by $3,300 that year.

Once you reach full retirement age, there is no earnings limit. You can earn any amount without a reduction to your benefit. However, if you earned more than expected in a year, the SSA may recalculate your benefit upward in the future, because higher recent earnings might replace a lower year in your 35-year average.

Self-employed workers report earnings on their tax return, and the SSA uses that reported amount to calculate the reduction. Wage earners have earnings reported by their employer. If you underreport earnings to avoid the reduction, you face tax penalties and potential overpayment recovery from the SSA.

Frequently Asked Questions

Can I see my own earnings record before I claim?

Yes. Create an account at ssa.gov and view your earnings history and estimated benefit amount. The SSA updates this information each year. If you see an error — a missing year, an employer name that is wrong, or earnings that do not match your records — you can request a correction, though you must do so within three years, three months, and 15 days of the year the earnings were reported.

What if I did not work in the United States for my whole career?

The SSA counts only earnings from U.S. employment or self-employment. If you worked abroad, those years typically do not count unless you paid U.S. Social Security taxes. Some countries have agreements with the United States that allow credits earned there to count, but this varies by country. Contact the SSA directly if you have a mixed work history.

Does my benefit change if I get married or divorced after I claim?

Your own retirement benefit does not change. However, a new spouse may become may have access to to spousal benefits, and a former spouse may lose them if you remarry. Spousal benefits are based on your Primary Insurance Amount, not on your own claimed amount, so the timing of your claim does not affect what a spouse receives.

How does disability or survivor benefits use the same calculation?

Disability and survivor benefits use the same Primary Insurance Amount formula as retirement benefits — your 35 highest-earning years, adjusted for inflation, divided by 420 months. However, younger workers who become disabled use a different bend point formula, and survivor benefits are calculated as a percentage of the deceased worker's Primary Insurance Amount, not the worker's actual claimed amount.

What if I worked part-time or had gaps in my work history?

Part-time earnings count the same as full-time earnings — the SSA looks at total wages, not hours worked. Gaps in your work history count as zero-earning years. If you worked only 30 years, the SSA counts five zero years in your 35-year average, which lowers your benefit. Some people return to work later in life specifically to replace a low-earning or zero year with higher recent earnings.