For the average retiree receiving $2,071 a month in Social Security, the Part B premium now consumes 9.8% of the check before supplemental coverage, deductibles, or any other healthcare cost enters the picture, AOL reported last week. Research from Boston College's Center for Retirement Research, cited in the same report, found the Part B increase absorbed more than 25% of the full 2026 COLA. A retiree who expected a $56 raise opened January's deposit statement and found $38.

The premium reduction and the deductible are separate hits that work differently. The $17.90 premium increase comes off every monthly check automatically, before spending a cent on care. The annual Part B deductible, which rose from $257 to $283, per CMS, adds another $26 in out-of-pocket exposure, but only kicks in when care is actually used, and resets each January. For a retired couple where both partners receive the average benefit, the combined net gain after Part B premium increases is roughly $76 a month in 2026. That's before the deductible.

More than 7 million Medicare enrollees were already spending at least 10% of their annual income on Part B premiums alone before this year's increase, KFF found.

One federal rule limits the damage for some beneficiaries. Under the hold harmless provision, the Part B premium increase for certain Social Security recipients is capped at the dollar amount of their COLA, preventing their net benefit from actually declining. About 4 million low-income beneficiaries will have their 2026 increase capped under this protection; those with monthly benefits of roughly $640 or less may not absorb the full $17.90, 401k Specialist reported last November. The provision does not apply to new Medicare enrollees, those paying premiums directly rather than through benefit deduction, or higher-income enrollees subject to income surcharges.

For roughly 8% of Part B enrollees, $202.90 is the starting point, not the bill, per CMS data cited by USA Today. The income-related monthly adjustment amount, known as IRMAA, layers a surcharge on top of the standard premium when modified adjusted gross income from 2024 exceeded $109,000 for single filers or $218,000 for joint filers.

The 2026 IRMAA brackets, per NerdWallet:

| 2024 individual MAGI | 2024 joint MAGI | 2026 monthly Part B premium | |---|---|---| | Up to $109,000 | Up to $218,000 | $202.90 | | $109,001–$136,000 | $218,001–$272,000 | $284.10 | | $136,001–$163,000 | $272,001–$326,000 | $394.90 | | $163,001–$500,000 | $326,001–$750,000 | $505.70 | | Above $500,000 | Above $750,000 | $689.90 |

At the top bracket, Part B alone costs more than $8,200 a year, KFF notes. IRMAA also applies to Part D prescription drug coverage, adding between $14.50 and $91 per month on top of the plan premium depending on income level, NerdWallet reports. One detail that catches people off guard: IRMAA applies whether someone is enrolled in Original Medicare or Medicare Advantage, since all beneficiaries owe the Part B premium regardless of coverage type.

The two-year lookback creates a specific trap. IRMAA is calculated from the 2024 tax return, meaning a single high-income year from a Roth conversion, required minimum distribution, capital gains realization, or business sale can lock a retiree into an elevated bracket for two consecutive years, even if their current income is far lower, AOL reported. A financially sound decision in 2024 can produce two years of elevated premiums that never showed up in the original plan.

None of these options reverse the standard $17.90 increase. They address surcharges, access assistance, or correct an inaccurate determination. The options split clearly by situation.

Most retirees paying the standard rate: If your monthly benefit is near or below $640, confirm that the hold harmless provision has been applied correctly by contacting the Social Security Administration at 800-772-1213. Lower-income enrollees may also qualify for a Medicare Savings Program, a Medicaid-administered benefit that can cover Part B premiums and cost-sharing. Eligibility criteria vary by state; contact your state Medicaid office or medicare.gov for the rules that apply to you, per KFF.

Retirees facing IRMAA whose income has since dropped: File Form SSA-44 with Social Security if income declined due to a qualifying life event, including retirement, divorce, death of a spouse, or reduction in work income. The SSA will use more recent income data to reassess the surcharge rather than waiting for the next annual cycle, NerdWallet explains. Separately, retirees who believe an error triggered the surcharge can call 800-772-1213 to request reconsideration. That pathway applies when IRS data contained a mistake, when the SSA used outdated figures, or when a beneficiary filed an amended return for the year in question. It does not apply to retirees still earning at the income levels that triggered the bracket.

Retirees still managing taxable income: IRMAA thresholds make income timing a Medicare issue, not just a tax one. Spreading Roth conversions across multiple years, coordinating capital gains realizations, and managing RMDs to stay below the $109,000 single or $218,000 joint threshold can prevent crossing into a surcharge bracket in future years. A one-time spike from an otherwise reasonable financial move can mean two years of elevated premiums, the kind of cost that rarely appears in a standard retirement projection, per NerdWallet.

The 2026 increase is not an anomaly. Part B premiums have outpaced the Social Security COLA three consecutive years: 9.7% premium growth against a 2.8% COLA in 2026; 5.8% against 2.5% in 2025; 6% against 3.2% in 2024, 401k Specialist reported. The gap compounds. Each year premiums grow faster than benefits, a slightly larger share of Social Security goes to healthcare before anything else gets paid.

The mechanism is structural, not accidental. By law, the standard Part B premium is set to cover 25% of total Part B spending, so as healthcare utilization and prices rise, premiums follow automatically, KFF explains. CMS attributed the 2026 increase to projected price changes and utilization growth consistent with historical patterns, Investopedia noted. The COLA tracks general consumer inflation, a different index rising at a different rate. Healthcare costs move on their own trajectory, which means Medicare can keep taking a larger bite from Social Security checks even in years when broader inflation cools.

A Senate Joint Economic Committee report published this month projected Part B premiums could reach roughly $5,000 annually by 2035, approximately double the current $2,440 level, per Morningstar. Treat that as directional rather than precise: part of the projected increase rests on assumed Medicare Advantage overpayment rates that a separate MedPAC analysis suggests may already be declining, from roughly 20% in 2025 to about 14% in 2026. The near-term picture is more concrete. Early estimates for the 2027 COLA range from 1.7% to 2.8%, with the official announcement due in October, Morningstar reported. If Part B keeps rising anywhere near its recent pace, next year's net gain could be smaller than this year's $38.

"Medicare Part B premiums consistently overtaking Social Security COLAs degrades American seniors' quality of life over time," Shannon Benton, executive director of the Senior Citizens League, said in a statement. "Our members constantly tell us that they feel like their benefits aren't keeping up, and this is a great example of that experience in action."

The $200 threshold got the attention. The harder point is that the mechanism producing these increases isn't a glitch. It's the program working exactly as designed.