How Social Security Benefits Work
A plain-language walkthrough of how your benefit is calculated, what your full retirement age means, and how claiming age, spousal, and survivor rules affect what you receive.
Step 1 — Your Earnings Become a Monthly Average
Social Security looks at your highest 35 years of covered earnings. Each year is indexed to near-current wage levels, so a dollar you earned decades ago is counted closer to what it would be worth today. Those 35 years are added together and divided by 420 months to produce your Average Indexed Monthly Earnings (AIME).
If you worked fewer than 35 years, the missing years count as zeros and pull the average down. Earnings above the annual taxable maximum ($184,500 in 2026) are neither taxed for Social Security nor counted toward your benefit.
Step 2 — The Formula Converts That Average Into Your Benefit
A three-bracket formula turns your AIME into your Primary Insurance Amount (PIA) — the monthly benefit you would receive at exactly your full retirement age. For 2026, the brackets are:
| Portion of Your AIME | Counted Toward Your Benefit |
|---|---|
| The first $1,286 | 90% |
| $1,286 – $7,749 | 32% |
| Anything above $7,749 | 15% |
The formula is deliberately progressive: the first slice of your career earnings is replaced at 90%, while the highest slice is replaced at only 15%. That is why Social Security replaces a much larger share of a modest earner's income than a high earner's. The dollar thresholds (called bend points) shift each year with national wage growth; the 90/32/15 percentages are set by law and do not change.
Step 3 — Your Full Retirement Age Depends on Your Birth Year
Your full retirement age (FRA) is the age at which you receive exactly your PIA — no reduction and no increase. It is set by the year you were born:
| Year of Birth | Full Retirement Age |
|---|---|
| 1954 or earlier | 66 |
| 1955 | 66 and 2 months |
| 1956 | 66 and 4 months |
| 1957 | 66 and 6 months |
| 1958 | 66 and 8 months |
| 1959 | 66 and 10 months |
| 1960 or later | 67 |
Step 4 — Claiming Early Reduces It; Waiting Increases It
You may start your benefit any time between 62 and 70. Your claiming age adjusts your PIA permanently — this is not a temporary reduction that catches up later.
Claiming Before Your FRA
Your benefit is reduced by about 5/9 of 1% per month for the first 36 months early, and 5/12 of 1% per month beyond that. With an FRA of 67, starting at 62 is 60 months early — a 30% reduction, leaving 70% of your full benefit.
Waiting Past Your FRA
You earn delayed retirement credits of 2/3 of 1% per month — about 8% per year — up to age 70. With an FRA of 67, waiting until 70 raises your benefit to 124% of the full amount. Credits stop at 70, so there is no gain from waiting longer.
The Break-Even Idea
Claiming early means smaller checks for more years; waiting means larger checks for fewer. The break-even age is where the cumulative totals cross. Live past it and the later claim has paid more in total; die before it and the earlier claim did.
What It Really Depends On
Break-even math is only one input. Your health and family longevity, whether you are still working, your other income and savings, and the income your surviving spouse would need all matter — which is why there is no universally correct claiming age.
Spousal & Survivor Benefits
Social Security also pays benefits based on a spouse's record, which often matters most for couples with very different earnings histories.
Spousal Benefit
A spouse can receive up to 50% of the other spouse's PIA if that is more than their own benefit. The 50% is the maximum, available at the spouse's own full retirement age.
Claiming a Spousal Benefit Early
It is reduced by 25/36 of 1% per month for the first 36 months before the spouse's FRA, and 5/12 of 1% beyond. Starting at 62 with an FRA of 67 leaves 32.5% of the worker's PIA rather than 50%.
No Credits for Waiting
Unlike your own retirement benefit, a spousal benefit does not grow with delayed retirement credits. Waiting past your full retirement age adds nothing to a spousal benefit.
Survivor Benefit
When one spouse dies, the survivor keeps the higher of the two benefits and the smaller one stops. Because of this, the higher earner's claiming age sets a floor under the survivor's income for life.
Social Security effectively pays the greater of your own benefit or your spousal benefit — not both added together. The real rules include additional detail (deemed filing, the excess-spousal computation, and separate survivor claiming-age reductions) that this educational tool simplifies.
See It With Your Own Numbers
The comparison view applies all of the above to your benefit — showing your monthly amount at every age from 62 to 70, your break-even ages, and a spousal and survivor illustration you can print and bring to your next meeting.
Compare Claiming Ages