Social Security basics: how benefits are calculated

In short

A friend of mine once told me he had no idea what his Social Security check would be until the day he opened the envelope. You do not have to wait that long. Your benefit comes from your own work record, and the Social Security Administration keeps that record for you at ssa.gov. Make an account there and read your statement. It shows your earnings year by year, so you can spot a missing year before it costs you. Then look at the estimates for claiming at different ages. Small changes in when you start can change your check for life.

The whole of it

What it is

I once sat on a porch with a retired mail carrier who said he paid into Social Security for forty years and never once asked how the math worked. He is in good company. Most of us pay in without a second thought, and that is a fair way to live, but a little knowing goes a long way.

Social Security retirement is a monthly payment based on your work history. You earn credits by working and paying Social Security tax. The Social Security Administration says you need the current figure, which the official source publishes each year credits to qualify for retirement benefits, and that you can earn up to four credits a year. The amount of each credit changes by year.

The payment is not a savings account with your name on it. Taxes from today's workers pay today's benefits. Your own record decides how large your share is, though. Your pay history sets the number. Your claiming age adjusts it.

How it works

If you are working now, you have probably wondered what the agency does with all those paychecks. Here is the plain version.

First, the agency looks at your earnings over your whole career. It adjusts older earnings upward to reflect rising wages, so a paycheck from 1995 is not treated as small next to one from last year. Then it picks your highest 35 years. If you worked fewer than 35 years, the missing years count as zero. That drags the average down. Every extra working year can replace a zero.

Second, it adds up those 35 years and divides by 420, the number of months in 35 years. The result is your average indexed monthly earnings. Indexed just means adjusted for wage growth.

Third, the agency runs that average through a formula with three tiers. The formula pays back a bigger share of the first slice of your earnings and a smaller share of each slice after. The formula pays a set percent of each slice, and the Social Security Administration publishes those percents and the slice sizes on its website. The first slice is replaced at the current figure, which the official source publishes each year. The next slice is replaced at the current figure, which the official source publishes each year. Anything above that is replaced at the current figure, which the official source publishes each year. The dollar lines between the slices are called bend points, and they change every year. The current ones are the current figure, which the official source publishes each year and the current figure, which the official source publishes each year.

The result is your primary insurance amount. That is the monthly benefit you get if you start at your full retirement age. The agency sets full retirement age by birth year. For anyone born in 1960 or later, it is the current figure, which the official source publishes each year. Claim earlier, and the check shrinks for good. Claim later, up to age 70, and it grows. The agency's own benefit pages give the exact reduction and increase.

The numbers, and where to find yours

A neighbor of mine kept his statement in a kitchen drawer for years before he read it. When he finally did, he found a year of earnings missing. Fixing it took a few phone calls, and it was worth every one.

Your own numbers live in your my Social Security account at ssa.gov. You will find your earnings record, your credits, and your estimated benefits at ages 62, full retirement age, and 70. Check the earnings record first. Employers report your wages, and mistakes do happen. The agency has a process for correcting them, and it asks for proof such as old pay stubs or W-2 forms.

Several figures change every year, so the site pulls them from the official source. The taxable maximum, the highest amount of yearly pay that Social Security tax applies to, is the current figure, which the official source publishes each year. The earnings needed for one credit is the current figure, which the official source publishes each year. The bend points are listed above. For the latest figures, the Social Security Administration publishes them on its website. The Internal Revenue Service also covers how benefits may be taxed.

A worked example

Let me tell you about a woman named Maria. She is 62, she has worked 35 years, and she wants to understand her check before she picks a date.

To keep the math easy, say her average indexed monthly earnings come to $5,000. This is a made up figure for teaching. The bend points here are also made up, so the real formula will give you a different answer. Say the first slice is the first $1,000, and the second slice runs from $1,000 to $6,000.

The first slice pays 90 percent. So 90 percent of $1,000 is $900.

The second slice covers $4,000 of her earnings, from $1,000 up to $5,000. It pays 32 percent. So 32 percent of $4,000 is $1,280.

She has nothing above the second slice, so the third tier adds $0.

Add them up. $900 plus $1,280 is $2,180. That is her primary insurance amount in this story, the check she would get at full retirement age.

Now say her full retirement age is 67 and she claims at 62, five years early. I will use a round 30 percent cut to keep the arithmetic clean. The real reduction comes from the agency's tables, and it depends on her exact months. 30 percent of $2,180 is $654. So $2,180 minus $654 is $1,526 a month at 62.

Had she waited until 70, the agency's rules would have raised her check above $2,180 instead. Say the raise were 24 percent. 24 percent of $2,180 is $523.20. Her check would be $2,703.20 a month.

Look at the gap. $2,703.20 minus $1,526 is $1,177.20 a month. It is a big swing. Maria does not know how long she will live, and neither do I. That is why she should look at her own estimates and not at my round numbers.

Where it goes wrong

I have watched good people trip on the same few stones, and none of them were careless. They simply had not been told.

The first stone is a gap in the record. If wages were never reported, or were reported under a wrong number, those years may not count. Check your statement.

The second stone is fewer than 35 years. Each missing year counts as a zero. Working a few more years can lift your average, especially if those years pay more than your early ones.

The third stone is claiming early without knowing the cost. The cut is permanent. A person who claims at 62 and then changes their mind cannot simply undo it. The agency has narrow rules about withdrawing a claim, so read them first.

The fourth stone is working while you collect before full retirement age. The agency may hold back part of your benefit if your earnings pass a yearly limit, which is the current figure, which the official source publishes each year. The held money is not lost. It is worked back into your check later. Still, it surprises people.

The fifth stone is taxes. Some benefits may be taxable depending on your other income. The IRS explains the rules on its website.

Questions to answer before you leave this page

Have you made your my Social Security account at ssa.gov, and have you looked at your earnings record for missing or wrong years? Do you know how many years of earnings you have on file, and whether any of your top 35 are zeros? What does your statement say you would receive at 62, at your full retirement age, and at 70? If you are married, divorced, or widowed, have you asked the agency what you might be owed on a spouse's record? Do you plan to keep working after you claim, and have you checked how the earnings limit might hold back part of your check? Do you know what your full retirement age is, and have you written it down where you will find it again? And who in your family would want to hear what you learned today?