Social Security calculates a retirement benefit from a worker’s covered earnings history, not simply their last salary. The agency wage-indexes earlier earnings, averages the highest 35 years, applies a progressive formula to that average, then adjusts the result for claiming age and cost-of-living increases. The figures used in the formula depend on the year a worker first becomes eligible, so the 2026 thresholds do not apply to every retiree.
1. Social Security starts with earnings covered by the program
Only earnings covered by Social Security count toward a retirement benefit, and the agency recognizes earnings only up to that year’s taxable maximum. For 2026, the maximum taxable earnings amount is $184,500. That is a year-specific limit, not a cap that can be applied to every year in a person’s work history. SSA’s 2026 COLA Fact Sheet lists the limit.
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This is why a final salary alone cannot tell you the size of your future check. The benefit reflects the covered earnings record across many years, with higher earnings in some years potentially replacing lower years in the calculation.
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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitches2. SSA adjusts older earnings for wage growth
For retirement benefits, the eligibility year is the year a worker reaches 62. SSA uses national average wage levels to index earlier earnings, putting them in context with wage growth. For a person first eligible in 2026, the reference wage index is from 2024: earnings before 2024 are multiplied by the ratio of the 2024 index to the index for the year they were earned, while earnings in 2024 or later are counted at face value. SSA’s indexing factors show the year-specific factors.
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3. The highest 35 years produce the AIME
SSA selects the 35 years with the highest indexed earnings, adds them together, and divides by 420, the number of months in 35 years. The result is the average indexed monthly earnings, or AIME. SSA rounds the AIME down to the next lower dollar. The calculation is described in the 2025 Annual Statistical Supplement, Appendix C.
If a worker has fewer than 35 years of earnings, the missing years count as zeros. Those years can lower the average; conversely, additional years of covered earnings may replace lower-earning years among the 35 SSA uses.
4. A progressive formula converts AIME into the PIA
SSA applies a formula to AIME to calculate the primary insurance amount, or PIA—the base monthly benefit before adjustments for claiming early or late. The formula applies different percentages to successive portions of AIME. For people first eligible in 2026, SSA uses these bend points:
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Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →| Portion of 2026 AIME | Percentage applied |
|---|---|
| First $1,286 | 90% |
| Amount from $1,286 through $7,749 | 32% |
| Amount above $7,749 | 15% |
The percentages apply to the portions within each range, not to the entire AIME at one rate. The design gives the lowest portion a higher percentage than the portions above it. Bend points change with wage levels and eligibility year; a person who reaches 62 in a different year may have different thresholds. See SSA’s PIA formula for the applicable rules.
5. Claiming age adjusts the PIA
The PIA is not necessarily the amount a person receives. Starting benefits before full retirement age reduces the monthly amount; delaying after full retirement age can increase it. Full retirement age depends on birth year, and the number of months early or late matters. SSA’s retirement benefit calculation examples illustrate the effect.
Example: claiming at 62 with a full retirement age of 67
In SSA’s 2026 illustration, a worker born in 1964 has a PIA of $2,609.80 and a full retirement age of 67. Starting benefits at 62—60 months early—produces an illustrated monthly amount of $1,826.
Example: full retirement age of 66 years and 10 months
In another 2026 illustration, a worker born in 1959 reaches full retirement age at 66 years and 10 months. The example shows a benefit of $4,152 at that age after rounding. These are calculation demonstrations, not estimates for an individual reader. SSA provides age-based benefit information at its Social Security benefit amounts page.
6. COLAs and rounding affect the final amount
Cost-of-living adjustments increase benefits over time. SSA announced a 2.8% COLA for 2026. The adjustment is applied to the PIA, then the applicable early- or delayed-claiming factor and any offsets affect the payable amount; the final amount is rounded down to a whole dollar. Because of intermediate rounding and other adjustments, an individual’s check may not rise by exactly 2.8%. SSA explains the calculation in its COLA application example and 2026 fact sheet.
What the published averages do—and do not—tell you
SSA estimated that the average monthly benefit for all retired workers payable in January 2026 would be $2,071 after the 2.8% COLA. That figure describes a group average; it is not a promised payment, an individual forecast, or a substitute for a calculation based on a worker’s own earnings record and claiming date. The same fact sheet reports the 2026 taxable maximum and COLA.
For a personal estimate, the factors that matter are the worker’s covered earnings history, the 35 indexed years SSA selects, the eligibility-year formula, and the chosen start date. A single salary figure or the population average cannot capture all of those inputs.
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