Retirement Social Security

Some Retirees Are Seeing Unexpected Changes in Their Monthly Checks - Here’s Why

Three routine deductions may explain why your check looks different.

By David Maina, CPA , Edited by Kristy DeSmit

Updated April 1, 2026

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If your Social Security deposit looked smaller than expected in January, the reason is probably simpler than you think. Every year, retirees notice a gap between the cost-of-living increase they were promised and the amount that actually shows up in their bank account.

That can be unsettling when your retirement plan depends on a specific monthly amount showing up on time. In many cases, though, your benefit did not actually shrink. The difference usually comes from money being withheld before the payment reaches you.

Here are a few common deductions that explain most of these surprises and how they affect your monthly check.

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Medicare premiums come out first

Medicare Part B is the deduction most likely to explain a smaller-than-expected deposit. The premium is subtracted directly from your Social Security payment each month before it reaches your bank account. In 2026, the standard Part B premium is $202.90, up from $185 the year before.

That increase alone can make a January deposit look noticeably smaller than December's, even if your gross benefit ticked up slightly with the annual cost-of-living adjustment (COLA). If you're also enrolled in a Part D prescription drug plan, that premium may be deducted the same way, adding another layer to the gap.

The bigger surprises tend to come from IRMAA, the Income-Related Monthly Adjustment Amount. Higher-income beneficiaries may owe a surcharge on top of the standard Part B and Part D premiums, based on tax return information from two years earlier.

A retiree focused on the COLA increase may not realize that an IRMAA threshold pushed their Medicare deductions well above the standard amount at the same time.

That said, if your income has dropped after retirement or another qualifying life event, you can request a reassessment by filing a SSA-44 form with the Social Security Administration. In some cases, this can bring the premium back down.

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Federal tax withholding is optional, but easy to forget

Unlike Medicare premiums, federal tax withholding on Social Security is entirely voluntary. But once it's in place, it stays until you change it, and that's where confusion tends to start.

The SSA allows four flat withholding rates: 7%, 10%, 12%, or 22% of your gross monthly benefit. On a monthly benefit of $1,800, a 10% election means $180 comes out before the money reaches your bank account. The idea is to prepay part of your federal income tax throughout the year rather than facing a lump sum at filing time.

Some retirees made that choice years ago through IRS Form W-4V or with SSA's help, often when their income looked different than it does now. If your tax picture has changed since then, the rate you selected may no longer fit. Until you update it, though, the withholding continues to come out of every check.

Working retirees can run into the earnings test

If you collect Social Security before full retirement age (FRA) and still earn money from work, your monthly benefit can be reduced for a while under the earnings test.

The 2026 thresholds work like this:

If you won't reach full retirement age at any point during the year, the SSA will withhold $1 in benefits for every $2 earned above $24,480.
If you're reaching full retirement age sometime in 2026, a different formula applies for the months leading up to your birthday: $1 withheld for every $3 earned above $65,160.
After the month you reach full retirement age, the test no longer applies, regardless of earnings.

An important detail that often gets overlooked is that this money isn't forfeited. Once you reach full retirement age, the SSA recalculates your benefit to credit back every dollar that was withheld. Your monthly payment going forward will be permanently higher as a result.

In practice, the earnings test works more like a temporary deferral, but because the reduced checks arrive without much warning, many retirees assume the money is gone.

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If the numbers still don't add up

If you've reviewed your Medicare premiums, checked for tax withholding, and compared your earnings against the relevant threshold, and your deposit still doesn't match what you expected, it's worth calling the SSA at 1-800-772-1213 to request a detailed breakdown.

Your benefit statement, available anytime through your My Social Security account at ssa.gov, will show more details.

Errors are uncommon, but they do happen, and they're easier to resolve early than after several months of incorrect payments have accumulated.

Bottom line

A drop in your Social Security deposit can feel alarming, but it rarely means what most people fear. The base benefit is almost always intact, and the difference usually comes from what is being subtracted along the way.

Taking a few minutes to understand your deductions can help you avoid money mistakes that compound over months of misread statements and unnecessary worry. Once you know where the money is going, your checks become easier to read and much easier to plan around.

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