Retirement Social Security

The Social Security Rule That Could Give Your Benefits a Boost if You Keep Working

The extra paycheck isn't the whole story.

By Chris Lewis, CEPF , Edited by Laura Hohenstein

Updated Oct. 22, 2026

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Retired and considering working an extra year? You probably see it as a simple trade: You show up, and you get paid. That's a fair assessment, but as far as Social Security is concerned, it's not the whole story. A lesser-known rule in how your check is calculated means a paycheck you earn at 62, 65, or even later could raise your benefit for your entire golden years.

When you make your retirement plan, it pays to know the Social Security Administration (SSA) doesn't base your benefit on your final salary or your last years of work. Instead, it uses a broader number that creates a real opportunity if you plan to keep working.

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How Social Security counts your earnings

The SSA calculates your retirement benefit using your highest 35 years of earnings. It adjusts earlier years to reflect wage growth, averages the best 35 into a monthly figure, and uses that figure in the formula that sets your benefit.

If you have less than 35 years of earnings, the missing years count as zeros. The SSA warns that stopping work before you reach 35 years of wages or having years of low earnings affects your benefit calculation.

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The "replacement" effect

So far, so good. However, this is the part that surprises people: The SSA notes that continuing to work may increase your benefit because current earnings may replace an earlier year of lower or no wages.

To understand this rule, think of your record as a roster with 35 spots. Every year you work gets a tryout. If this year's earnings are higher than the weakest year on your roster, the new year bumps the old one out, and your average goes up. However, if this year's earnings are lower than everything else on the roster, nothing changes. A weak year never drags your benefit down once you have 35 stronger ones.

What does this mean? For some workers, working longer does more than bring home another paycheck. It upgrades the retirement benefit they'll collect for decades.

What it could look like

Let's consider a hypothetical worker who is 62 and has 35 years of earnings. One of them, from a part-time job in their early twenties, is worth under $10,000 after adjusting for wage growth. The worker is now earning $85,000 a year.

If they work another year, the $85,000 replaces the under-$10,000 year. While the benefit formula returns only a portion of each extra dollar of average earnings, it could add up to hundreds of dollars a year.

The gain may be larger for someone with fewer than 35 years on the record. Replacing a zero with a $60,000 year increases counted earnings by $60,000. Spread across the 420 months in 35 years, that lifts the average monthly earnings by roughly $143.

The figure is simplified and for illustration only, but it shows how a single replaced year may add up over a long retirement.

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Who is most likely to benefit

Unfortunately, not everyone benefits from this rule. It matters most for three types of workers.

First, workers with fewer than 35 years of earnings, such as people who took time off to raise a family, started working late, or have employment gaps, could work an extra year (or more) to eliminate the zeros from their roster.

Likewise, people whose early-career pay was low, including those who began part-time or in minimum-wage jobs and now earn much more, may also benefit.

Finally, late-career earners, whose best-paying years are happening now rather than decades ago, could also increase their benefits this way.

On the other hand, workers who already have 35 high-earning years may see little or no change, since a new year has to beat their lowest one to matter.

Working and claiming at the same time

One of the most important parts of this rule is how you time your claim. If you claim before full retirement age while still working, your benefit is reduced for claiming early, and it may be reduced further if you exceed the yearly earnings limits.

Once you reach full retirement age, the SSA recalculates your benefit to credit months withheld because of your earnings.

If you keep working and delay claiming, your benefit grows for each month you wait until age 70. The SSA notes there's no incentive to delay beyond that point. In that case, delayed retirement credits and a stronger earnings record could work together.

Bottom line

Working longer sometimes gives you more than extra paychecks. Because Social Security counts your highest 35 years of earnings, a strong year late in your career may replace a weak or empty one and push your benefit higher. While the effect is often modest and doesn't help everyone equally, it could provide a meaningful, permanent boost for people with low-earning years.

Before you decide how long to keep working, or when to claim to stretch your retirement dollars further, review your earnings record. Sign in to your my Social Security account, look at your year-by-year earnings history, and note your lowest years and any zeros. Compare them with what you earn now, and make sure every year is recorded correctly, since a missing year costs you as much as a low one.

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