How The Size of Your Social Security Check Is Determined

For retirement planning, the size of your Social Security check is incredibly important. It determines how much additional income you need, how much you need to save to generate that income, and how much you can comfortably spend.

While Social Security benefits rules can feel complicated, the Social Security Administration uses a simple formula to calculate your benefit. Once you understand how it works, you're in a much better position to know how much to expect, when to claim benefits, and how Social Security income fits in your retirement plan.

How the size of your Social Security check is determined

Your retirement benefit is determined by three key components: your lifetime earnings record, the benefit formula applied to those earnings, and the age at which you claim benefits. Let's dive deeper into each factor to help you better understand how your Social Security benefits are calculated to determine steps you can take to maximize your retirement income.

Your average indexed monthly earnings

The foundation of your Social Security benefit is your average indexed monthly earnings (AIME). This is the highest 35 years of earnings throughout your work history.

If you worked fewer than 35 years, zeroes are added for the missing years. This is one of the most common reasons people receive smaller checks than expected. For this reason, delaying retirement can substantially boost your retirement benefits, especially during peak earning years.

Since income earned years ago isn't the same as money earned today due to inflation, each year is indexed to reflect today's wage levels. For example, the average salary in 1985 was 16,822, compared to $69,846 in 2024, before adjusting for inflation over the last 40 years.

After adjusting for inflation, the highest 35 years are added together and divided by 420 months (35 years times 12 months). The result is your average indexed monthly earnings (AIME) amount.

Your primary insurance amount and bend points

Once your AIME is calculated, Social Security applies a formula to determine your primary insurance amount (PIA). This is the benefit you'll receive when claiming Social Security benefits at full retirement age.

The formula uses "bend points," which replace a higher percentage of lower earnings and a smaller percentage of higher earnings. This is done intentionally to make Social Security more progressive to assist lower-income earners.

For someone reaching age 62 in 2026, the formula works like this:

• 90% of the first $1,286 of AIME
• 32% of AIME between $1,286 and $7,749
• 15% of AIME above $7,749

Let's walk through a simple example using round numbers. If your AIME is $4,000, then 90% of the first $1,286 is $1,157. Applying 32% to the remaining $2,714 is $868. Combining these two numbers results in a PIA of about $2,025 per month at full retirement age.

The age at which you claim Social Security benefits

Your claiming age has a permanent impact on your monthly benefit. When you claim early, your monthly benefit is reduced permanently, up to 30%. Imagine losing 30% of your paycheck for the rest of your life.

For every year you wait to claim benefits, your monthly Social Security income increases. After full retirement age (67 for anyone born in 1960 or later), your retirement benefits increase 8% per year up until age 70. After you reach age 70, there is no additional benefit for waiting to claim benefits.

For someone with a full retirement benefit of $2,000 per month, you would lose $600 per month by claiming Social Security at age 62. This 30% reduction to $1,400 per month is permanent. Plus, the cost-of-living-adjustment each year would be smaller by dollar amount, which would cause this gap to widen every year.

If you waited until age 70 to claim Social Security, you would receive about $2,480 per month. That's nearly 77% more per month for doing nothing else but waiting to start collecting benefits. And this increase is guaranteed. You don't have to qualify or do anything special to get the extra money.

Other factors that can affect your benefit

Several real-world situations can change your check size:

• Working fewer than 35 years. Having a shorter work history lowers your AIME because the formula inserts zeroes for any year that you don't have income. Many seniors continue to work in retirement to replace those zero-income years with higher earnings to increase their monthly benefits.
• Low lifetime earnings. Earning less results in a smaller benefit, even if you worked for many years. Taking steps to boost your income, like getting a degree, earning promotions, job-hopping, working overtime, or starting a side hustle, can boost your Social Security checks.
• Working while collecting before full retirement age. Working while receiving Social Security may temporarily reduce benefits due to the earnings test.
• High earnings late in your career. Making more money helps to increase your benefit by replacing lower-earning years and increasing your average income.

It's also important to understand that spousal and survivor benefits are calculated differently. A spouse may receive up to 50% of your PIA while you are alive. However, survivor benefits can be as high as 100%, depending on the timing and circumstances under which they were claimed. Surviving spouses may be able to maximize Social Security benefits by claiming based on their work history or as a survivor, then switching at a later date.

Bottom line

You should review your earnings history and benefit estimates on the my Social Security website regularly. Errors happen, and fixing them early can increase your retirement income for life.

Understanding how your Social Security check is calculated removes the guesswork and allows you to take steps to maximize your senior benefits. You'll know when to claim, how long to work, and how to coordinate benefits with the rest of your retirement income strategy. These simple steps can be worth thousands of dollars over the course of your retirement.

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