How it works
Social Security converts your lifetime earnings into a monthly retirement benefit using a formula called the Primary Insurance Amount (PIA). The calculator takes your average indexed monthly earnings (AIME)—the average of your highest 35 years of earnings, adjusted for inflation—and applies bend points to calculate your full retirement age benefit.
Bend points are progressive thresholds. Your earnings up to the first bend point are replaced at a higher rate (typically 90%), earnings between the first and second bend point at a middle rate (typically 32%), and earnings above the second bend point at a lower rate (typically 15%). This structure ensures lower-income workers receive proportionally more support.
The formula
PIA = (0.90 × AIME up to first bend point) + (0.32 × AIME between bend points) + (0.15 × AIME above second bend point)
Worked example
Suppose your average indexed monthly earnings are $3,500, and the current bend points are $1,174 and $7,078.
Step 1: Calculate earnings in the first bracket (up to first bend point)
$1,174 × 0.90 = $1,056.60
Step 2: Calculate earnings in the second bracket (between bend points)
Earnings between bend points = $3,500 − $1,174 = $2,326
$2,326 × 0.32 = $743.32
Step 3: Calculate earnings in the third bracket (above second bend point)
Since $3,500 is below the second bend point of $7,078, there are no earnings in this bracket.
$0 × 0.15 = $0
Step 4: Add the brackets
$1,056.60 + $743.32 + $0 = $1,799.92 per month
This is your estimated Primary Insurance Amount (PIA) at full retirement age. If you claim at 62, this amount would be reduced; if you delay past full retirement age, it increases.
Common mistakes
Using gross income instead of AIME: Your average indexed monthly earnings are not your current salary. They're calculated by Social Security using your 35 highest years of indexed earnings. Overestimating AIME leads to inflated benefit estimates.
Forgetting bend points change annually: The thresholds shift each year with wage growth. Always verify current bend points on ssa.gov rather than using outdated figures.
Assuming you'll receive this amount at 62: The calculator shows your full retirement age benefit. Claiming early reduces it significantly—typically by 25–30% if you claim at 62. Plan accordingly.
Ignoring work credits: You need 40 work credits (roughly 10 years of earnings) to qualify for retirement benefits. If you haven't reached that threshold, you won't receive benefits regardless of your AIME.
This calculator provides an estimate for planning purposes only and is not professional financial or legal advice. For a precise benefit estimate, create a my Social Security account at ssa.gov or contact your local Social Security office.