How Your Social Security Benefit Is Actually Calculated

In this episode of Motley Fool Hidden Gems Investing, Motley Fool personal finance expert Robert Brokamp takes a listener’s real-world question about Social Security 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.

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A full transcript is below.

This podcast was recorded on Aug. 15, 2026.

Robert Brokamp: How your Social Security plan is actually calculated this week on the Saturday Personal Finance Edition of The Motley Fool Hidden Gems Investing podcast. I’m Robert Brokamp, and it’s now been a little over a year since I took over these Saturday episodes of our show. If you’ve been listening along, you’ve likely noticed that I’ve done some experimenting here and there. In most episodes, I have a guest, but sometimes it’s just me, as will be the case this week. In previous episodes, I’ve included some items from the news and maybe a suggestion for getting something financial done. But I’ve decided to hold off on adding those segments for now because they’ve often caused the episodes to run a little long.

We begin with lots of questions from our listeners. Most of them are related to stocks, but many are about financial planning, including one I’m going to address in this episode. I did a financial planning mailbag back in March, and I think I’ll continue to do one of those each quarter with the next one in September. I’d love to hear your personal finance questions and your feedback on and suggestions for these Saturday episodes. You can email them to podcasts at fool.com. That’s podcast plural with s at fool.com. Listener who sent in a question is Fred, and here’s a slightly edited version of his question. “Can you clarify the Social Security 35-years rule? I started contributing at age 26. I’m 45 years old now and at the maximum salary for my healthcare career. I plan to semi-retire and reduce my income by 50% at age 55. I plan to work till age 67 and start collecting Social Security after that. How can I calculate my benefit?”

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Robert Brokamp: Well, Fred, when it comes to calculating your potential Social Security benefit, there are three primary concepts to understand. The first is your average indexed monthly earnings, AIME often pronounced as AIME. The second are the Social Security bend points, and the third is your primary insurance amount. Let’s go over each of those. As you hinted at in your question, Social Security is based on your 35 highest-earning years. Amounts that you earn in the years before turning age 60 are adjusted for wage inflation based on the national average wage index. Those 35 highest earning years are totaled together and then divided by 420, which is the number of months of 35 years. The result is your average index monthly earnings or AIME.

Now, a couple of things about the AIME to keep in mind. First, there’s a cap on how much annual income is subject to Social Security taxes and thus factored into the AIME calculation. That amount is adjusted each year, and for 2026, it is $184,500. Secondly, years in which you didn’t work, maybe because you retired early or you stayed home to raise the kids will count as zeros in your AIME calculation if you don’t have at least 35 years of earnings. Working another year or few, even part time will replace some of those zeros and improve your AIME. All right. The next step in your benefit calculation is to apply the so called bend points to your AIME. These bend points are adjusted each year for wage inflation but are permanently locked in when the worker turns 62. For those turning that age in 2026, here are those bend points and how they interact with your AIME. Start with 90% of the first $286 of the AIME plus 32% of the AIME $1,286 and $7,749 plus 15% of the AIME above $7,749. Add those three figures together and you get your primary insurance amount, which we’ll discuss in more detail in a bit. But first, what’s the point of those Bend points? Social Security is designed to replace a larger percentage of earnings for lower-income workers. They’re like tax brackets in reverse.

According to a report published by the Social Security Administration earlier this year, here are the percentages of pre-retirement income that will be replaced by Social Security for a person born in 1960 who claims benefits at their full retirement age of 67, based on their career average annual earnings. One who earned $32,400 over the course of their career, on average, each year, Social Security is going to replace 55% of it. Someone who earned $72,000 per year, Social Security is going to replace 41% of that. Somebody earning $115,000, there’s going to be a 34% replacement rate, and someone who earned $178,000 on average each year. The replacement rate is 27%. The key takeaway here is that the more you earn, the more you may need to save because less of your pre-retirement income will be replaced by Social Security.

All right, let’s turn to the primary insurance amount. That is what you will receive from Social Security if you claim at your full retirement age, which depends on the year you were born. For each month before your full retirement age that you claim Social Security, your benefit will be reduced. For each month you delay, your benefit gets bigger up to age 70. All told for someone who was born in 1960 or later and thus has a full retirement at age of 67, claiming at age 62 permanently reduces the benefit by up to 30%, whereas waiting until age 70 increases it by about 24%. Keep in mind that the primary insurance amount doesn’t just determine your benefit. It can also be used to determine the benefits of family members who will be claiming benefits on your earnings record, and reductions in your benefit due to claiming earlier can also have an impact on family-related benefits, including spousal benefits, survivor benefits, and the family maximum limit. When it comes to evaluating when you should claim benefits, don’t only think about how it’ll affect the amount you receive. Consider the impact it may have on your family members.

Now, a little detour here. Every year, Social Security benefits receive a cost-of-living adjustment, also known as the CL, based on the consumer price index for urban wage earners and clerical workers, otherwise known as the CPIW, and it’s based on that CPIW for July, August, and September. Given that we’re now in that time of year, you’ll likely see more headlines with projections about the 2027 COLA. This is a good time to remind everyone that the cola doesn’t just benefit those who have already claimed. The Social Security Administration also adjusts the benefit formula for people who are eligible, so generally, age 62 or older, but haven’t claimed yet. Their eventual benefit reflects those annual inflation adjustments. In other words, you don’t need to claim early to lock in a COLA. Your benefit keeps getting inflation adjustments every year you wait on top of the delayed retirement credits.

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Robert Brokamp: We’ve covered the basics of how a Social Security benefit is calculated. How can you estimate the amount that you will receive? You start by accessing your Social Security statement, which can be downloaded at ssa.gov/myaccount. It contains earnings history, estimate disability benefits, estimate benefits for your survivors. It also includes a projected retirement benefit based on a range of claiming ages. Just know that those projections are shown in today’s dollars. If, for example, your projected benefit at age 67 is, say, $3,000 a month, will likely be higher than that on a nominal basis, but roughly have the same purchasing power as $3,000 today.

Now, it’s important to know that the estimates you’ll see in your statement assume you’ll earn the same annual income in the future as you did in the most recent year for which the Social Security Administration has information. It also assumes that you’ll earn that income every year up until the year you claim benefits, but that may not be the case, perhaps because you retired at one age, but delay claiming to an older age. The projections in your statement will also not be accurate if your income changes materially between now and when you claim benefits, which will be the case for Fred, Fool who posed the question at the beginning of this episode and expects to go eventually part time and reduce his income by 50%.

In these cases, you get a more refined estimate from the Social Security detail calculator, which can be found at, and this is the long URL here ssa.gov/oact/npia/.html. If you didn’t get all that, just do an online search for the Social Security detailed calculator. Just know that if you want to use it, you have to download it onto your computer. Another excellent free resource that may be helpful is ssa.tools, created by a member of the esteemed Bogleheads community. A final resource to consider is maximizemscialsecurity.com, which costs $49 a year, but allows you to enter past earnings, which actually can be imported, and then you can manually enter future earnings assumptions and come up with a benefit estimate. The software will also recommend a claiming age for you.

Finally, I should address the elephant in the room, which is that the Social Security Trust Fund is expected to run dry sometime around 2032 or so. At which point, the program will only be able to pay around 75% to 80% of benefits. Now, I hope that our government comes up with a solution before then, and, you know, it’s an election year, so feel free to find out what the various candidates are proposing. I do think that any potential changes may change some of the nuts and bolts of how Social Security benefits are calculated, but I also think that the essential machinery that I’ve described in this episode will mostly remain the same. Fred, I hope that helps you zero in on an answer to your question. If you, dear listener, have a question or feedback on these Saturday episodes, send them to podcast at fool.com. I can’t promise we’ll be able to answer each question, but we’ll do our best, perhaps along the way, or in our Mailbag episode in September.

That, Fools friends, is the show. Thanks so much for listening, and thanks to Bart Shannon, the engineer for this and every Saturday episode. As always, people on the program may have interest in the investments they talk about, and The Motley Fool may have formal recommendations for or against. Don’t buy or sell investments based solely on what you hear. Personal finance content follows Motley Fool editorial standards. It is not approved by advertisers. Advertisements are sponsored content and provided for informational purposes only. To see our full advertising disclosure, please check out our show notes. I’m Robert Brokamp. Fool on, everybody.