How Your Social Security Benefit Is Actually Calculated

August 15, 2026

AI Summary

5 min read

Social Security replaces a smaller share of your pre-retirement income the more you earn over your career—27% for someone averaging $178,000 a year versus 55% for someone averaging $32,400. That gap is the central reason to understand how your benefit is actually calculated, because it determines how much you need to save on your own. In this episode, Motley Fool host Robert Brokamp walks through the three-part formula that produces your monthly check and explains why the standard estimates on your Social Security statement may be misleading if your income changes later in your career.

The Three-Step Formula: AIME, Bend Points, and Primary Insurance Amount

Your benefit rests on three linked calculations. First, the Social Security Administration takes your 35 highest-earning years, adjusts earnings before age 60 for national wage growth, caps them at the annual taxable maximum ($184,500 in 2026), adds them up, and divides by 420 months. The result is your Average Indexed Monthly Earnings, or AIME. If you have fewer than 35 years of earnings, the missing years count as zeros, which is why working even part-time later in life can meaningfully raise your AIME by replacing those zeros.

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What you'll learn

1 (00:01) **Episode Setup & Listener Question** - Host Robert Brookham introduces the solo episode and reads a listener question from Fred about calculating Social Security benefits under a semi-retirement plan.
2 (03:38) **The Three Core Concepts of Social Security Calculation** - Robert introduces the three primary concepts needed to understand benefit calculations: AIME, bend points, and the primary insurance amount.
3 (03:57) **Concept 1: Average Indexed Monthly Earnings (AIME)** - Robert explains that AIME is based on the 35 highest earning years, adjusted for wage inflation for years before age 60.
4 (04:54) **Concept 2: Social Security Bend Points** - Robert describes how bend points, locked in at age 62, are applied to AIME in a progressive formula that replaces a higher percentage of income for lower earners.
5 (06:39) **Concept 3: Primary Insurance Amount (PIA) & Claiming Age** - Robert explains that PIA is the benefit at full retirement age (67 for those born in 1960 or later) and is adjusted for early or delayed claiming.
6 (07:45) **Detour: Cost-of-Living Adjustments (COLA)** - Robert clarifies how annual COLAs work and that they apply to future benefits even for those who haven't yet claimed.
7 (10:32) **How to Estimate Your Personal Benefit** - Robert outlines the tools available to estimate your own Social Security benefit, starting with the official statement from ssa.gov.

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Show Notes

Think you know how Social Security calculates your benefit? Chances are, you're missing at least one piece of the puzzle. Host Robert Brokamp takes a listener’s real-world question and turns it into a clear, step-by-step guide to how your benefit is actually built. Key concepts discussed:
-The “35 highest-earning years” rule—demystified: How Social Security treats your top earning years, wage inflation adjustments, and what “zero years” can do to your average.
-AIME, bend points, and PIA: The three core building blocks of your benefit and why the formula is designed to replace a higher share of income for lower earners.
-Claiming strategy matters more than you think: How taking benefits early vs. waiting (up to age 70) permanently changes your payout—and why family benefits (spousal/survivor) should be part of the decision.
-How to estimate your benefit with better tools: Where the Social Security statement can mislead (especially if income will drop later), plus the best calculators and resources to model realistic future earnings and claiming ages.
Host: Robert Brokamp, CFP®, EA
Engineer: Bart Shannon and Kristi Waterworth

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