35 Years, AIME, Bend Points: How Your SS Check Is Set

Maria, a 61-year-old single filer in Ohio, logged into her my Social Security account and saw an estimate of $2,631/month at full retirement age. She wanted to know one thing: where does that number come from, and can she change it? The answer is a three-step formula written into the Social Security Act §215 — and yes, with one more year of work she can move it. Her highest 35 years of earnings, wage-indexed, total roughly $2.52 million. Divided by 420 months, that is an AIME of $6,000. Run through the 2025 bend points ($1,226 and $7,391), that AIME produces a PIA of about $2,631. This is exactly how every retirement check in the country gets set.

The three steps that set every Social Security check

There is no discretion and no negotiation. The SSA computes your benefit through three mechanical steps under the Social Security Act §215:

1. Index and average your top 35 years. The SSA takes your 35 highest earning years, adjusts each for national wage growth, sums them, and divides by 420 months to get your AIME (Average Indexed Monthly Earnings).
2. Apply the bend points. AIME runs through a three-tier progressive formula — 90% / 32% / 15% — to produce your PIA (Primary Insurance Amount), the check you receive if you claim exactly at full retirement age (67 for anyone born in 1960 or later).
3. Adjust for claiming age. Claim before 67 and the PIA is permanently reduced by up to 30% at age 62; delay past 67 and it grows 8% per year up to age 70.

Understand steps one and two and you understand why your check is the size it is — and which levers actually move it.

Step 1: AIME — your highest 35 years, divided by 420

The SSA pulls your entire earnings record, but only the 35 highest years after wage indexing count. Indexing matters: $30,000 earned in 1995 is worth far more in today’s dollars after the SSA scales it by the growth in the national average wage. That is why a modest salary from decades ago can still be a “top 35” year.

Once the SSA has your 35 highest indexed years, it adds them together and divides by 420 months (35 years × 12). That quotient is your AIME. The arithmetic is unforgiving in one direction: the divisor is always 420, even if you worked fewer than 35 years.

Step 2: Bend points — 90%, 32%, and 15%

Your AIME does not become your benefit dollar-for-dollar. It runs through a progressive formula with two bend points that split your AIME into three slices, each replaced at a declining rate. For 2025, the bend points are $1,226 and $7,391 (they rise each year with the national average wage index, Social Security Act §215(a)):

• 90% of the first $1,226 of AIME
• 32% of AIME between $1,226 and $7,391
• 15% of AIME above $7,391

Add the three pieces together and you have your PIA. Here is Maria’s $6,000 AIME running through the formula:

Maria’s $6,000 AIME sits entirely inside the first two bands, so her 15% slice is zero. Her PIA — about $2,631 after the SSA rounds down to the next lower 10 cents — is the check she’d collect at 67. That is the source of the estimate on her statement.

Step 3: Claiming age moves the PIA up or down

The PIA is the benefit at full retirement age, which is 67 for everyone born in 1960 or later. From there, your actual check depends entirely on when you claim:

Delayed retirement credits stop accruing at 70, so there is no benefit to waiting past that age. The spread between Maria’s earliest and latest check is about $1,420/month — the same PIA, three different decisions.

Why fewer than 35 years quietly cuts your check

This is the single most misunderstood part of the formula. The divisor is always 420 months, regardless of how many years you actually worked. If you have only 30 years of earnings, the SSA does not divide by 360 — it divides by 420 and fills the five missing years with $0.

Five zeros averaged into your top-35 set drags AIME down hard. Take a worker whose 30 working years averaged $98,000 indexed annually — about $2,940,000 in total. Spread across 420 months instead of 360, the five $0 years pull AIME from a potential $7,000 down to $6,000, and PIA drops with it: $7,000 AIME would have produced a PIA near $2,951, so those zeros cost roughly $320/month for life. The fix is mechanical: each additional working year that beats a current low or zero year replaces it in the top-35 set.

• Working a 36th high-earning year only helps if it is higher than your current 35th-best year — it bumps the lowest one out.
• Replacing a $0 with even a modest year — $40,000 indexed — can lift AIME by roughly $95/month and your PIA by about $30/month, every month for life.
• Replacing a $0 inside the 90% band delivers the biggest per-dollar lift, because that first slice is replaced at 90 cents on the dollar.

Why high earners get a smaller replacement rate

The bend points make Social Security deliberately progressive. The first $1,226 of AIME is replaced at 90%; the next band at 32%; everything above $7,391 of AIME at just 15%. A worker earning the 2026 wage base of $181,800 — the maximum amount subject to Social Security tax — piles most of their AIME into the 15% band, so each extra dollar of high earnings buys only 15 cents of benefit.

This is by design. Social Security replaces a much larger share of a low earner’s wages than a high earner’s, which is why high earners need 401(k), Roth, and brokerage savings to fill the gap that the formula intentionally leaves.

What most people miss: your statement assumes you keep earning

The estimate on your my Social Security statement is a projection, not a guarantee — and the assumption baked into it surprises people. The SSA assumes you keep earning at your recent rate right up until you claim. If your statement shows $2,631 at 67 but you stop working at 60, those final working years drop to $0 in the top-35 calculation, and your actual AIME — and check — come in lower than projected.

A few other things people miss:

• The bend points are fixed by your eligibility year, not your claiming year. The 90%/32%/15% percentages never change, but the dollar thresholds that apply to you are locked at the year you turn 62, then your PIA is adjusted by cost-of-living increases afterward.
• A raise late in your career can index poorly. Recent earnings are indexed at a factor of 1.0 (no upward adjustment), so a high salary at 64 competes with old years that got scaled up — it may not crack your top 35 by as much as you’d expect.
• The earnings test is not a permanent cut. If you claim before 67 and keep working, the $24,360 earnings test (2026) temporarily withholds benefits, but the SSA recomputes and credits them back at full retirement age — it is a deferral, not a loss.
• WEP and GPO are gone. The Social Security Fairness Act (Public Law 118-273, signed January 2025) repealed both provisions, so public-pension retirees no longer see their PIA cut for non-covered government work.

The lever you actually control

Two of the three steps are fixed math you cannot touch — the 420-month divisor and the 90%/32%/15% bend points are the same for everyone. The lever you control is which 35 years fill the formula. Pull your earnings record at ssa.gov/myaccount and find your lowest indexed years. If any are zeros or are far below your current earning power, one more working year that beats them raises your AIME, lifts your PIA, and pays out every month for the rest of your life. Then, and only then, decide whether to claim that larger check at 62, 67, or 70. Run the formula first; choose the claiming age second.

Key takeaways

• Your check is set by three steps under Social Security Act §215: index and average your top 35 years (÷ 420 months) for AIME, run AIME through the 90%/32%/15% bend points for PIA, then adjust for claiming age.
• The 2025 bend points are $1,226 and $7,391; they rise each year with the national average wage index. A $6,000 AIME produces a PIA near $2,631 at full retirement age 67.
• The divisor is always 420 months. Fewer than 35 working years means $0 fills the gaps, dragging your AIME and check down — replacing a zero with a real year is the cleanest way to raise your benefit.
• The formula is progressive: a max earner at the $181,800 wage base replaces only ~31% of pay, versus ~60% for a low earner, because the top band returns just 15 cents per dollar.
• Your SSA statement assumes you keep earning until you claim — stop early and your actual check comes in below the projection.
• The lever you control is which 35 years fill the formula; the divisor and bend-point percentages are fixed for everyone.