Why Some Retirees Pay $689.90 a Month for Medicare While Others Pay $202.90

Most people on Medicare pay the standard Part B premium each month and never give it a second thought. In 2026, that amount is $202.90, a figure that rose $17.90 from the 2025 level of $185.00 and one that rarely becomes a major focus in retirement planning.

What catches many retirees off guard is learning that a neighbor, sibling, or former coworker with the exact same coverage is paying more than triple that amount.

The difference has nothing to do with health history or which plan someone chooses. It all comes down to income, specifically, income from two years ago, collected through a surcharge called IRMAA. The tricky part is that most people have no idea what IRMAA is until a letter from Social Security arrives telling them they owe more.

What IRMAA Is and Why It Exists

IRMAA stands for Income-Related Monthly Adjustment Amount. It is the mechanism Medicare uses to charge higher premiums to beneficiaries above certain income thresholds. The surcharge is added on top of the standard $202.90 Part B premium and rises across five tiers based on modified adjusted gross income (MAGI), which is adjusted gross income plus any tax-exempt interest income added back in.

For 2026, IRMAA kicks in above $109,000 in MAGI for single filers and $218,000 for married couples filing jointly. At the lowest surcharge tier, the total monthly premium rises to $284.10. At the top tier, which applies to single filers above $500,000 and joint filers above $750,000, the total monthly premium reaches $689.90. That is a difference of $487 a month compared to the standard rate, or roughly $5,844 per year. About 5.1 million Medicare beneficiaries paid Part B IRMAA surcharges in 2025, representing roughly 7% to 8% of all enrollees.

IRMAA applies to both Part B and Part D premiums. Part D surcharges range from $14.50 to $91.00 per month in 2026, added on top of whatever a beneficiary already pays for their prescription drug plan. That cost layer goes largely unmentioned in most retirement planning conversations, even though it compounds the total exposure for higher-income enrollees.

The Five Tiers for 2026

The table below shows how Part B premiums escalate across all five IRMAA tiers for individual and joint filers in 2026.

There is also a separate and considerably harsher schedule for married beneficiaries who lived with their spouse at any point during the year but file separate tax returns. In that case, the standard $202.90 premium applies only below $109,000 in MAGI. Cross that line by even a dollar, and the surcharge jumps immediately to $446.30 for a total of $649.20. Above $391,000, it reaches $689.90. Filing separately while married is one of the fastest ways to trigger a disproportionate Medicare surcharge, because the brackets that apply to single filers are compressed into just two steps instead of five.

One additional detail worth flagging: the top bracket ($500,000 for single filers, $750,000 for joint filers) is frozen by statute through at least 2028. Because the lower tiers are adjusted for inflation each year while the ceiling stays fixed, more high-income retirees will drift into Tier 5 over time as incomes and bracket thresholds rise around a stationary cap.

The Two-Year Lookback That Catches Retirees Off Guard

Medicare does not use current-year income to set premiums. It uses income from two years prior, meaning 2026 premiums are based on what appeared on the 2024 tax return. That two-year lookback creates a situation where a retiree who has already left the workforce and dramatically reduced income can still be stuck paying a high IRMAA surcharge because of what they earned before retiring.

The cliff effect makes all of this worse. IRMAA thresholds are hard cutoffs, not gradual phase-ins. Cross into another tier by even a single dollar and it triggers the full higher premium for the entire year. A large Roth conversion, a capital gain from selling a rental property, or a one-time business distribution in the wrong tax year can push MAGI over a threshold and result in thousands of dollars in unexpected Medicare costs two years later.

How to Manage MAGI Before It Becomes a Problem

The two-year lookback is both a planning opportunity and a trap. Retirees and their financial advisors who monitor MAGI carefully in the years leading up to and during Medicare enrollment can avoid unnecessary surcharges. Qualified charitable distributions allow IRA owners aged 70 and a half or older to direct up to $111,000 per year directly to a charity from their IRA, satisfying required minimum distributions without the amount ever appearing in AGI. That limit rose from $108,000 in 2025 and is now indexed for inflation annually.

The QCD strategy has become even more valuable following changes to charitable deduction rules in 2026. Because the distribution bypasses AGI entirely rather than flowing through as income first, it reduces MAGI dollar for dollar regardless of whether the taxpayer itemizes. Spreading Roth conversions over multiple years, rather than executing a single large conversion, keeps MAGI from spiking across a tier boundary in one tax year. Timing capital gains across tax years can similarly smooth the income curve that Medicare will eventually evaluate.

The Appeal Option Many Retirees Do Not Know Exists

A higher IRMAA bill is not necessarily final. Form SSA-44, available through Social Security, allows beneficiaries to appeal their surcharge when a qualifying life-changing event has reduced income since the year being evaluated. Retirement, divorce, the death of a spouse, or the loss of income-producing property all qualify.

The important catch is that Medicare will not automatically adjust premiums when income drops. The beneficiary has to initiate the appeal, and many simply do not know the option exists until they have already paid the higher amount for months or longer.

One especially painful scenario is what retirement planners sometimes call the widow or widower trap. When a spouse passes away, the survivor’s tax filing status switches from married filing jointly to single. At the exact same income level, single filers hit IRMAA brackets far sooner than joint filers. The result can be a significant premium increase even though nothing about the surviving spouse’s day-to-day spending or lifestyle has changed. Filing Form SSA-44 promptly after such a life event is the most direct way to address that problem.

The gap between $202.90 and $689.90 per month is not arbitrary. It traces back to income from two years earlier, hard tier cutoffs with no phase-in, and a system that does not volunteer adjustments when circumstances change. Getting familiar with how IRMAA works well before Medicare enrollment, and revisiting it annually during the years that feed the two-year lookback, is one of the more straightforward ways to protect retirement cash flow.

Editor’s note: This article has been updated to reflect the correct 2026 qualified charitable distribution limit of $111,000 per individual (up from $108,000 in 2025, per IRS Notice 2025-67), and to add context on Part D IRMAA surcharges, the frozen top-tier bracket through 2028, and the approximately 5.1 million Medicare beneficiaries who paid Part B IRMAA surcharges in 2025.

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