Retirement Social Security

The Social Security Rule That Matters Most Once You’re Within 2 Years of Retirement

Learn the rule that impacts your future benefits.

By Chris Lewis, CEPF , Edited by Laura Hohenstein

Updated May 3, 2026

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As retirement gets closer, the decisions that once felt distant suddenly carry a lot more weight. Social Security is one of the biggest senior benefits you'll probably receive. However, it's still being calculated right up until you claim. Many people assume that once you get close to retirement, it's already locked in, but that assumption can cost them.

In the last two working years, your earnings can still influence your final monthly check. That makes this period more important than it appears on the surface. Before you file, it's worth understanding the rule that continues to shape your benefit right up to the finish line.

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The rule: your highest 35 years of earnings decide your benefit

Social Security benefits are calculated using your highest 35 years of Average Indexed Monthly Earnings. While early career earnings are adjusted for wage inflation, earnings in the year you turn 60 are used at their actual dollar value, making late-career raises particularly powerful for your bottom line.

If you don't have 35 full years, zeroes get averaged in. That can pull your monthly benefit down far more than many people expect.

Here's the key point: your final working years can still replace lower-earning years in your record. Even if you've been working for longer than 35 years, if you've had a major change in income, those last few years still matter.

Even one strong earning year can increase your benefit. This rule stays relevant right up until you claim.

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Why it become critical in the final two years

Earlier in your career, there's time to course-correct. Within two years of retirement, there usually isn't. At this stage, you probably already have close to 35 years of earnings. However, any improvement can still replace weaker years. The time to replace those years may be quickly diminishing, though.

That's why this rule tends to get overlooked. People assume their benefit is fixed when in reality, those last paychecks may still be shaping it.

A small change could have a lasting impact

This impact might not look dramatic at first glance, but it has the potential to make a big difference. Replacing a low-earning year with a higher one permanently increases your monthly benefit. That's increased money for life, not just for the month you get the paycheck. Cost-of-living increases also build on that higher base, leading to permanent increases every year.

This isn't a one-time adjustment. The SSA automatically recomputes your record every year. If your final working year ranks in your top 35, the SSA will increase your monthly benefit automatically.

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Common mistakes people make near retirement

As you approach retirement, it's easy to think that you're basically done making financial decisions. However, there are many mistakes that can impact your financial security right up until the day you retire.

Some of these include:

Cutting back to very low earnings too early
Retiring mid-year without considering income timing
Assuming late-career work no longer matters
Overlooking how bonuses or final raises affect their record

None of these decisions is inherently wrong. But without understanding the rule, it's easy to miss the trade-offs. Even a pay increase in your last year before retirement matters.

When working longer might (or might not) help

Working longer can improve your benefit, but it depends on your earnings history.

Working longer may help a lot if you're replacing very low-earning or zero-income years or if your current income is much higher than earlier in your career. Those with career gaps or part-time stretches will benefit the most.

However, it matters less if you already have 35 strong earning years. The difference comes down to whether those final years actually improve your top 35.

How to check if this rule applies to you

You don't have to guess. A quick review of your Social Security earnings record can give you clarity. Look for years with low or no reported income, and whether your recent income is higher than in earlier years. If it is, then working longer can have a big impact on your monthly benefit.

You can also use benefit estimates to see how future earnings might change your projected monthly amount. This is one of the few areas where a small amount of planning can still make a measurable difference.

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Don't overlook how late earnings are updated

Your Social Security record does not update instantly. Employers typically report earnings the following year, which means your most recent income may not show up in the benefit estimates right away.

This can matter if you're checking your projected benefit close to retirement. If your latest (and possibly higher) earnings aren't included yet, your estimate could look lower than what you'll actually receive. Before making any decisions, it's worth confirming that your record is complete (or at least understanding what's missing) so you're working with the most accurate picture possible.

Bottom line

Your Social Security benefit isn't fully set until you stop working and claim it. In the final two years before retirement, your earnings can still replace lower-income years in your record, which could increase your monthly check for life. That's why this rule matters more than most people realize. Paying attention to it now can help you set yourself up for retirement with fewer surprises.

Consider timing your final working year carefully. Earning a full year of income, even if you retire late in the year, could have a bigger impact than stopping mid-year with lower reported earnings. At the end of your working career, even the last few months can make a noticeable difference. Before you give notice, log into your 'my Social Security' account to see which of your 35 years are the weakest. You might find that just six more months of work could erase a low-earning year from your youth forever.

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