Is Your October Social Security Check Smaller Than Expected? Here's Why

If your Social Security deposit landed in your account this month and the amount looked off, you're not imagining things. Those senior benefits typically arrive on a predictable schedule, but the dollar figure attached to that deposit can shift for reasons that have nothing to do with a mistake by the Social Security Administration (SSA).

Several routine, built-in features of how Social Security works can quietly reduce a monthly payment, even in years when benefits are supposed to go up. Understanding what's behind the numbers can help you figure out whether your payment is accurate or whether it's worth a call to the SSA.

Medicare Part B premiums come out before you see a dime

For most beneficiaries, the Medicare Part B premium is deducted automatically from a Social Security check before it ever reaches a bank account. The standard Part B premium rose to $202.90 a month in 2026, up $17.90 from $185.00 in 2025, according to the Centers for Medicare & Medicaid Services (CMS). That increase alone can make a check look smaller than the prior year's deposit, even though the underlying Social Security benefit went up.

The Part B deductible also increased to $283 in 2026 from $257 in 2025, per CMS. While the deductible doesn't come out of a Social Security payment directly, it's part of the broader cost picture that can catch retirees off guard this time of year.

IRMAA surcharges can push your premium even higher

Higher earners may pay more than the standard Part B premium through an income-related monthly adjustment amount, or IRMAA. Medicare bases this surcharge on modified adjusted gross income (MAGI) from two years prior, so 2026 premiums are determined by 2024 tax returns, according to CMS.

For 2026, individuals with MAGI above $109,000 (or married couples filing jointly above $218,000) may pay more than the standard premium. The surcharges scale up from there, according to CMS:

• MAGI above $109,000 up to $137,000 (individual) or $218,000 up to $274,000 (joint): $284.10 total monthly premium.
• Above $137,000 up to $171,000 (individual) or $274,000 up to $342,000 (joint): $405.80 total monthly premium.
• Above $171,000 up to $205,000 (individual) or $342,000 up to $410,000 (joint): $527.50 total monthly premium.
• Above $205,000 and less than $500,000 (individual) or $410,000 up to $750,000 (joint): $649.20 total monthly premium.
• $500,000 or above (individual) or $750,000 or above (joint): $689.90 total monthly premium.

Because IRMAA is based on income from two years earlier, a retiree who sold a home, took a large retirement account withdrawal, or had another high-income year in 2024 could see a surprise surcharge show up in 2026, even if their current income is much lower. The SSA does offer a process to request a reconsideration if a life-changing event, like retirement or divorce, reduced income since that tax year.

The earnings test can reduce benefits for people still working

Beneficiaries who claim Social Security before reaching full retirement age (FRA), generally 67 for people born in 1960 or later, and who continue working, may have benefits temporarily withheld under the retirement earnings test.

For 2026, the SSA will withhold $1 in benefits for every $2 earned above $24,480 a year for people who won't reach FRA this year. In the calendar year someone reaches FRA, a higher limit applies: $65,160, with $1 withheld for every $3 earned above that amount, counting only earnings before the month FRA is reached, according to the SSA. Once someone reaches full retirement age, the earnings test no longer applies, and there's no limit on how much they can earn while collecting benefits.

It's worth noting that money withheld under the earnings test isn't gone for good. The SSA recalculates the benefit at FRA to credit back the months withheld, which can mean a modestly higher check going forward.

Tax withholding elections quietly shrink the deposit

Social Security benefits can be subject to federal income tax depending on total household income, and some beneficiaries choose to have taxes withheld directly from their monthly payment rather than paying a lump sum later. 

If a withholding election was recently set up or changed, it may be why this month's deposit looks smaller than expected. Beneficiaries can check or adjust voluntary tax withholding through IRS Form W-4V or by reviewing elections in their my Social Security account.

Overpayment recovery can take a serious bite

If the SSA determines someone was overpaid in a prior year, often due to unreported income, a change in marital status, or a processing error, it generally recoups the money by withholding part of future payments.

As of April 25, 2025, the SSA's default withholding rate for Social Security overpayments is 50% of the monthly benefit, according to the agency. That means someone newly flagged for an overpayment could see a portion of their check withheld until the balance is repaid. For SSI overpayments, the default withholding rate remains 10% of the maximum federal benefit rate, per the SSA.

Anyone surprised by a sudden drop tied to an overpayment notice has the right to appeal the decision or request a waiver if they believe the overpayment wasn't their fault and repayment would cause financial hardship, according to the SSA.

Even the COLA increase itself can offset part of the raise

Each January, Social Security benefits increase by the annual cost-of-living adjustment (COLA), which is tied to inflation data from the Bureau of Labor Statistics. For 2026, the COLA is 2.8%, raising the average retired worker's benefit to an estimated $2,071 a month, according to the SSA's 2026 COLA fact sheet.

But a higher gross benefit doesn't always mean a higher net deposit. Because Medicare premiums and IRMAA thresholds are set independently, a COLA raise can push some beneficiaries' income into a higher IRMAA bracket, or simply get absorbed by that year's Part B premium increase. In some cases, the dollar increase in a monthly check barely covers, or doesn't fully cover, the increase in what's deducted for Medicare.

What to do if the numbers still don't add up

Beneficiaries who can't account for a lower-than-expected payment have a few ways to dig deeper. A my Social Security account shows the breakdown of current benefit amounts, any Medicare premium deductions, and notices related to IRMAA or overpayment recovery. 

The SSA also mails a COLA notice each year detailing the new benefit amount and deductions, and that notice is available digitally for account holders who opt in by the SSA's annual deadline.

If the discrepancy still isn't clear after checking online records, the SSA can be reached directly at 1-800-772-1213 to ask about specific deductions on file.

Bottom line

A smaller-than-expected Social Security check is rarely a sign of an error or low financial fitness. More often, it reflects the normal interaction between benefit calculations, Medicare premiums, IRMAA thresholds, tax elections, and overpayment rules that were already part of the system. Because several of these factors are based on income from a year or two earlier, they can show up unexpectedly and without much advance warning.

Reviewing your my Social Security account each year, especially after a COLA increase, can help you understand exactly what's being deducted and why, rather than being caught off guard by the final deposit amount.

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