The Basic Formula: Your 35 Highest-Earning Years

Social Security takes your earnings record from your entire working life, finds your 35 highest-earning years, and averages them together. That average becomes the foundation of your monthly benefit. If you worked fewer than 35 years, the formula counts the missing years as zero, which lowers your average.

The Social Security Administration (SSA) adjusts your historical earnings to account for wage growth over time — so a dollar you earned in 1985 is not compared directly to a dollar you earned in 2020. This adjustment is called wage indexing, and it happens automatically. You do not need to do anything; the SSA handles it when they calculate your benefit.

Once the SSA has your 35-year average, they explore a formula called the Primary Insurance Amount (PIA). This formula bends the curve: it replaces a higher percentage of your earnings if you were a lower-income worker, and a lower percentage if you were higher-income. This is why two people with very different career earnings can have more similar benefits than you might expect.

Key Takeaways

  • Your benefit is based on your 35 highest-earning years; years with no earnings count as zero and pull your average down.
  • The SSA adjusts your old earnings for inflation automatically so that earnings from different decades are compared fairly.
  • The benefit formula replaces a larger share of low earnings and a smaller share of high earnings, so the system is progressive.
  • Your benefit amount changes if you claim before your full retirement age, and it increases if you delay claiming past that age.
  • You can view your own earnings record and estimated benefit on your Social Security account at ssa.gov.

How the Primary Insurance Amount (PIA) Formula Works

After the SSA calculates your 35-year average monthly earnings (called your Average Indexed Monthly Earnings, or AIME), they plug that number into the PIA formula. The formula has three brackets, and each bracket has its own replacement rate.

For someone who reaches full retirement age in 2024, the formula works roughly like this: you get 90 percent of the first $1,174 of your AIME, then 32 percent of earnings between $1,174 and $7,078, then 15 percent of anything above $7,078. These dollar amounts change every year based on national wage trends. The point is that the formula gives you back a much higher percentage of your first dollars of earnings than your last dollars.

This is why a worker who earned $30,000 a year for 35 years will receive a higher monthly benefit than you might calculate by straightforward division. The formula front-loads the replacement, so lower-income workers get a larger share of their career earnings back as a monthly check.

What Happens If You Claim Before Full Retirement Age

You can claim Social Security as early as age 62, but if you do, your monthly benefit is permanently reduced. The reduction is not small: claiming at 62 instead of at your full retirement age (which ranges from 66 to 67 depending on your birth year) typically cuts your monthly check by 25 to 30 percent.

The SSA calculates this reduction month by month. The further before your full retirement age you claim, the larger the cut. If you claim at 62 and your full retirement age is 67, you lose roughly 30 percent. If you claim at 65, you lose roughly 13 percent. These percentages are fixed by law and do not change year to year.

The reduction is permanent — it does not go away when you reach full retirement age. If you claim early and later regret it, you cannot undo the reduction by waiting longer. You can withdraw your claim within 12 months of filing and reapply later, but that window is narrow and comes with tax consequences if you have already received payments.

What Happens If You Delay Claiming Past Full Retirement Age

If you wait to claim Social Security after you reach full retirement age, your monthly benefit grows. For each year you delay (up to age 70), your benefit increases by roughly 8 percent per year. This increase is called a delayed retirement credit.

If your full retirement age is 67 and you wait until 70 to claim, your monthly benefit will be about 24 percent higher than it would have been at 67. This higher amount is locked in for life and is also used to calculate any survivor benefits your family may receive if you pass away.

Delaying does not make sense for everyone — it depends on your health, family history, and how much you need the income now. But the math is built into the formula: the SSA automatically calculates a higher PIA for anyone who claims after full retirement age.

How Work History Gaps Affect Your Calculation

If you took time out of the workforce — to raise children, care for a family member, go back to school, or for any other reason — those years count as zero in your 35-year average. The more years you were out of work, the lower your average becomes, and the lower your benefit will be.

There is no way to remove a zero year from your record once you have claimed. However, if you return to work and earn more than you did in an earlier year, the SSA will automatically recalculate your benefit using your new 35 highest years. This recalculation happens once a year, usually in September, and you do not need to request it.

If you have very few work years — fewer than 10 — you may not meet the minimum requirement to receive a benefit on your own record. The SSA requires 40 work credits to claim retirement benefits; most people earn four credits per year, so 10 years of work is the typical minimum. If you do not have 40 credits, you may still be able to claim as a spouse or survivor, depending on your situation.

How Earnings After You Claim Affect Your Benefit

If you claim Social Security before full retirement age and continue to work, your benefit is temporarily reduced if your earnings exceed a certain limit. For 2024, if you have not yet reached full retirement age, Social Security deducts $1 from your benefit for every $2 you earn above $23,400 per year. In the year you reach full retirement age, the limit is higher and the reduction is smaller.

Once you reach full retirement age, there is no earnings limit — you can earn as much as you want without any reduction to your benefit. Additionally, if you earned more after claiming than you did in one of your 35 highest years, the SSA will recalculate your benefit to include that higher year, which may increase your monthly payment.

This recalculation is automatic and happens once per year. You do not need to report your earnings to Social Security; they receive that information from your tax return. If a recalculation results in a higher benefit, the SSA will send you a notice and adjust your payments going forward.

Understanding Your Earnings Record and Estimates

You can view your own earnings record and see what the SSA has on file for each year you worked. To do this, create an account at ssa.gov and log into your Social Security account. Your account shows your earnings year by year and gives you an estimate of what your monthly benefit would be if you claimed at 62, at full retirement age, or at 70.

These estimates are based on the assumption that you will not work again and that you will live to an average age. They are not guarantees, but they are accurate projections based on your actual record. If you see an error — a year with missing earnings, or earnings attributed to the wrong year — you can contact the SSA to correct it. Corrections can take several months, so it is worth checking your record early.

If you do not have a Social Security account yet, you can create one using your Social Security number, email address, and a way to verify your identity. The account takes just a few minutes to set up and gives you access to your earnings record anytime.

Frequently Asked Questions

Does Social Security count self-employment income the same way as W-2 wages?

Yes. Self-employment income is counted the same way as wages for the purpose of calculating your benefit, as long as you report it on your tax return and pay self-employment tax. The SSA receives this information from your tax records, so you do not need to report it separately.

What if I worked in another country before moving to the United States?

Social Security only counts earnings from work in the United States. However, some countries have agreements with the United States that allow work credits from that country to count toward your Social Security benefit. You would need to contact the SSA directly to find out whether your country has such an agreement and how to report your foreign work history.

Can I see how much my benefit will increase if I delay claiming?

Yes. Your Social Security account at ssa.gov shows your estimated benefit at three different claiming ages: 62, full retirement age, and 70. You can also call the SSA at 1-800-772-1213 and ask a representative to walk you through the estimates for any age you are considering.

What happens to my benefit if I become disabled before I reach full retirement age?

If you become disabled and meet Social Security's definition of disability, you can claim benefits before full retirement age without the early-claiming reduction. Your benefit is calculated the same way as a retirement benefit, but the reduction does not explore. Once you reach full retirement age, your disability benefit automatically converts to a retirement benefit at the same amount.

Does my spouse's earnings affect my Social Security benefit?

No. Your benefit is calculated based only on your own earnings record. However, your spouse may be able to claim a benefit based on your record, and that spousal benefit is calculated separately. Your earnings do not reduce your spouse's benefit, and their earnings do not reduce yours.