What Is IRMAA? The Medicare Surcharge That Blindsides Retirees

Most retirees expect a fixed Medicare premium. IRMAA is the reason that expectation is wrong for millions of Americans every year.

In 2026, if your 2024 modified adjusted gross income exceeded $106,000 as a single filer (or $212,000 married filing jointly), you are paying a Medicare surcharge on top of your standard Part B and Part D premiums. The Social Security Administration adds it automatically, and many retirees only discover it when they see the deduction from their first benefit check.

How IRMAA Actually Works

IRMAA stands for Income-Related Monthly Adjustment Amount. It is not a penalty or a tax. It is a tiered premium adjustment that Medicare applies based on your income from two years ago.

The two-year lookback is the part that surprises people most. Your 2026 IRMAA surcharge is based on your 2024 tax return. That means a one-time income event in 2024, such as a Roth conversion, a business sale, or a large capital gain, can trigger a surcharge you pay throughout all of 2026. The income used is your Modified Adjusted Gross Income (MAGI), which includes wages, Social Security benefits, dividends, capital gains, and IRA distributions.

The 2026 IRMAA Brackets

Medicare Part B has a standard 2026 premium of $185.00 per month. IRMAA adds to that based on five income tiers.

For single filers:

• $106,001 to $133,000: $259.00/month total Part B premium
• $133,001 to $167,000: $370.00/month
• $167,001 to $200,000: $480.90/month
• $200,001 to $500,000: $591.90/month
• Above $500,000: $628.90/month

For married filing jointly, the thresholds are roughly double: the first surcharge tier begins at $212,001.

Part D IRMAA surcharges are separate and stack on top of whatever your plan premium already is. At the highest income tier, Part D adds another $81.00 per month per person. A married couple at the top bracket could pay over $1,400 per month in combined Part B and Part D premiums before any cost-sharing.

Why Retirees Get Blindsided

The surcharge problem is almost always a planning problem, not an income problem. The most common triggers are retirement-year income spikes that were either necessary or poorly timed.

Roth conversions are the biggest culprit. A retiree converting $150,000 from a traditional IRA to a Roth in 2024 may have pushed their MAGI into the second or third IRMAA bracket, raising their 2026 Medicare costs by $2,000 to $4,000 per person. Required Minimum Distributions from large IRAs create the same problem, and unlike Roth conversions, they cannot be avoided.

Capital gains from selling a home, a rental property, or a concentrated stock position also count toward MAGI. If you live in a state with no income tax but took a large gain in 2024, you still face federal IRMAA in 2026. The state tax picture affects your take-home, but Medicare uses federal MAGI regardless. See our breakdown of capital gains tax by state to understand how your state tax exposure interacts with your total retirement income picture.

How to Appeal or Reduce IRMAA

IRMAA is recalculated every year, so a one-year income spike does not follow you forever. If your income dropped in 2025 (the most recent tax year at the time 2026 surcharges were assessed), you may be able to request a redetermination using your 2025 return.

The IRS also allows appeals based on a life-changing event. Qualifying events include retirement, divorce, death of a spouse, loss of income-producing property, or reduction in pension income. You file Form SSA-44 with the Social Security Administration to request a lower IRMAA tier based on a more recent year's income.

The cleanest long-term fix is managing MAGI before age 63. That means spacing out Roth conversions across multiple years to stay below bracket thresholds, harvesting capital gains strategically, and working with a financial planner who understands the two-year lookback rule.

Where you retire also affects your total cost burden, because state income taxes on retirement income compound the Medicare surcharge problem. States that tax IRA withdrawals and Social Security push your MAGI higher relative to your spendable income. Our guide to the best states for retirees to avoid taxes covers which states reduce your overall exposure, and our post on states that don't tax Social Security is directly relevant if benefit income is part of your retirement income mix.

Key Takeaways

• In 2026, IRMAA begins for single filers with 2024 MAGI above $106,000 and married filers above $212,000, based on your most recent available tax data.
• At the highest income tier, a married couple could pay over $1,400 per month combined for Part B and Part D premiums alone.
• IRMAA is recalculated annually and can be appealed using Form SSA-44 if you experienced a qualifying life-changing event that reduced your income.

Use our retirement cost calculator to see how IRMAA, state income taxes, and cost of living combine in different states, and compare your options before you decide where to retire.