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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteSocial Security calculates a worker’s retirement benefit from covered earnings on that worker’s record. The Social Security Administration (SSA) wage-indexes earlier earnings, uses the highest 35 years to compute average indexed monthly earnings (AIME), then applies a progressive formula to produce the primary insurance amount (PIA). The PIA is a starting benefit—not necessarily the amount paid each month—because claiming age and other applicable adjustments can change it.
How the calculation works
- SSA wage-indexes earlier covered earnings. This adjusts past earnings to account for changes in general wage levels. The indexing year is tied to the year the worker reaches age 60; earnings from that year onward are not wage-indexed in the same way. The calculation depends on the earnings recorded on the worker’s Social Security record. See the SSA’s earnings and AIME explanation.
- SSA calculates AIME. It selects as many as 35 years of the worker’s highest indexed earnings, totals them, and divides by the corresponding number of months. When 35 years are used, the divisor is 420 months. If the worker has fewer than 35 years of earnings, the averaging period still reflects 35 years, so years without earnings do not contribute earnings to the average. SSA rounds the resulting average down to the next lower dollar.
- SSA applies the PIA formula. The formula applies different percentages to successive portions of AIME. Its percentages are fixed, but the dollar thresholds—called bend points—depend on the year the worker first becomes eligible. SSA rounds the calculated PIA down to the next lower dime; the benefit at full retirement age is then rounded down to a whole dollar. The SSA explains the formula in its Primary Insurance Amount page.
How the 2026 formula applies
For workers first eligible in 2026, the bend points are $1,286 and $7,749. The formula applies 90% to the first $1,286 of AIME, 32% to the portion from $1,286 through $7,749, and 15% to any portion above $7,749. These thresholds are specific to 2026 eligibility; a worker eligible in another year uses that year’s bend points.
The progressive structure gives the largest percentage to the first slice of AIME and smaller percentages to higher slices. It does not apply one percentage to the worker’s entire earnings history or last salary.
SSA’s 2026 worked example
For an AIME of $5,825, the calculation is:
90% × $1,286 + 32% × ($5,825 − $1,286) = $2,609.88.
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Rounding the result down to the next dime gives a PIA of $2,609.80. This is SSA’s illustrative calculation, not an estimate of any particular worker’s benefit. See the SSA’s 2026 examples.
Why the monthly check can differ from PIA
PIA is the basic monthly benefit for someone claiming at normal retirement age, before an early-claiming reduction or delayed-retirement increase. The actual benefit depends in part on when the worker starts benefits. For example, SSA’s 2026 material says a person retiring at exactly age 62 in 2026 receives 30% less than PIA. That example applies to the relevant birth cohort and is not a universal reduction for every person who claims at 62. SSA outlines benefit amounts in its benefit-amount explanation.
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How to understand an estimate or compare calculations
When reviewing two estimates, check that they use the same inputs and assumptions. A difference may reflect a different eligibility year or claiming date rather than an arithmetic error.
- Eligibility year and bend points: use the formula for the year the worker first becomes eligible, not automatically the current year’s formula.
- Earnings record: confirm the covered earnings used and which indexed years rank among the highest 35.
- Claiming age and month: distinguish the PIA from an estimate adjusted for the date benefits begin.
- Rounding: compare values at the same calculation stage; SSA rounds AIME, PIA, and the full-retirement-age benefit at different stages.
For a personal estimate, the worker’s own earnings record is essential; the SSA’s 2026 example cannot substitute for it.
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