IRMAA: Medicare's High-Income Surcharge Explained

Most Medicare beneficiaries pay a standard Part B premium — $202.90 per month in 2026. But if your income exceeds certain thresholds, you pay significantly more. This extra charge is called the Income-Related Monthly Adjustment Amount, or IRMAA — a surcharge that can add hundreds of dollars per month to your Medicare costs.

Understanding IRMAA is critical for anyone approaching Medicare eligibility with above-average retirement income. This guide explains how IRMAA is calculated, what the 2026 brackets are, what it actually costs over a full year, the income “cliff” that catches people off guard, and — importantly — how to manage your income to stay below the thresholds and how to appeal the surcharge when your income has recently dropped.

What Is IRMAA?

IRMAA is a means-tested premium surcharge applied to Medicare Part B and Medicare Part D (prescription drug coverage) for beneficiaries whose income exceeds defined thresholds. The surcharge is calculated by the Social Security Administration (SSA) and added directly to your monthly Medicare premiums.

The surcharge was created by the Medicare Modernization Act of 2003 and expanded over subsequent years. The intent is to have higher-income beneficiaries pay a larger share of Medicare’s true cost — standard premiums cover only about 25% of Part B’s actual cost, while the top IRMAA tier covers roughly 85%.

Key facts:

• IRMAA applies to both Part B and Part D premiums
• It’s based on your modified adjusted gross income (MAGI) from two years prior
• The SSA uses IRS tax data to determine your income — you don’t need to report it separately
• IRMAA is re-evaluated annually — if your income drops, your surcharge drops in the following year
• Each spouse on Medicare pays IRMAA separately, so a high-income couple effectively pays it twice

How IRMAA Is Calculated

The SSA uses your MAGI from two years ago to determine your current-year IRMAA. In 2026, this means they’re looking at your 2024 tax return.

Your MAGI for IRMAA purposes is your adjusted gross income (AGI) plus any tax-exempt interest income (such as interest from municipal bonds). It does not include Social Security benefits unless those benefits are already included in your AGI. Note the trap: municipal-bond interest is income-tax-free but still counts toward IRMAA, so “tax-free” muni income can still raise your Medicare premiums.

Most people don’t need to calculate this themselves — SSA sends a letter in late fall (called an IRMAA determination letter) informing you of your upcoming premium level for the next year.

2026 IRMAA Brackets: Part B

The standard Part B premium is $202.90/month in 2026. IRMAA surcharges are in addition to this amount:

Note: Brackets are adjusted annually. Verify current-year amounts at Medicare.gov.

2026 IRMAA Brackets: Part D

IRMAA also applies to Part D drug coverage. The surcharge is added on top of whatever premium your specific plan charges:

The Part D surcharge applies even if you get drug coverage through a Medicare Advantage plan that bundles prescriptions, and it’s billed to you directly by Medicare — not by your plan.

What IRMAA Actually Costs You Per Year

Monthly figures understate the bite. Here’s the annual surcharge per person — Part B and Part D combined — at each tier, on top of the standard premiums everyone pays:

For a high-income couple in the top tier, IRMAA alone adds nearly $14,000 a year to their Medicare costs — a recurring expense that, for many retirees, rivals what they spend on everything else in healthcare costs in retirement. Because the surcharge is per person, the couple column is simply double the per-person figure: both spouses pay their own surcharge once each is enrolled.

IRMAA Is a Cliff, Not a Slope

This is the single most important thing to understand about IRMAA — and the detail that costs people the most money.

IRMAA is not phased in gradually. The moment your MAGI crosses a threshold by even one dollar, the entire surcharge for that tier applies. There is no marginal blending.

Consider a single filer with 2024 MAGI of exactly $109,000 — they pay no surcharge. Earn one more dollar ($109,001), and they jump into Tier 1: +$81.20/month on Part B plus +$14.50 on Part D, or $1,148.40 for the year. One dollar of income triggers over eleven hundred dollars of surcharge. For a couple where both are on Medicare, that same dollar costs $2,296.80.

The practical lesson: when your income is anywhere near a threshold, the last few thousand dollars of MAGI — a slightly-too-large Roth conversion, an extra capital-gains sale, a year-end IRA withdrawal — can be extraordinarily expensive. Knowing exactly where the next cliff sits before December 31 is worth real money.

Strategies to Manage Your MAGI and Avoid IRMAA

Because IRMAA is driven entirely by MAGI, the surcharge is one of the few Medicare costs you can actively control through tax planning. The goal is to keep MAGI below the next threshold in years that matter. Common strategies:

• Time Roth conversions carefully. Converting traditional IRA money to a Roth raises MAGI in the conversion year and can trigger IRMAA two years later — but converting before you reach Medicare age (or in deliberately sized annual chunks) can lower future Required Minimum Distributions, which themselves push MAGI up later. See retirement tax planning for how conversions interact with brackets.
• Use Qualified Charitable Distributions (QCDs). After age 70½, you can send up to the annual QCD limit directly from your IRA to charity. A QCD satisfies your RMD but is excluded from MAGI — one of the cleanest ways to lower the income that drives IRMAA.
• Spread capital gains across years. A single large asset sale can blow through a threshold. Realizing gains over two or three years, or harvesting losses to offset them, can keep each year under the cliff.
• Mind the drawdown order. Drawing from Roth accounts (tax-free, not in MAGI) instead of traditional accounts in a high-income year is a core part of building retirement income strategies that keep MAGI controlled.
• Coordinate with Social Security timing. When you claim benefits affects your taxable income mix; see when to claim Social Security.
• Remember the muni-bond caveat. Tax-exempt interest still counts toward IRMAA MAGI, so shifting to municipal bonds reduces income tax but not necessarily IRMAA.

None of this means avoiding income for its own sake — the long-term benefit of a Roth conversion often outweighs a one-year IRMAA hit. The point is to make the trade-off deliberately, with the cliff in view.

The “Two-Year Lookback” Problem

The most frustrating aspect of IRMAA is the two-year lookback. If you retired in 2025 and your income dropped dramatically from 2024 to 2025, you’ll still be charged 2026 IRMAA based on your 2024 (pre-retirement) income.

This creates a situation where people who have recently retired face unexpectedly high Medicare premiums precisely when their income has dropped. The good news: there’s a formal appeal process to correct this (covered below).

Why Age 63 Matters

The lookback has a specific consequence for people approaching Medicare. Because 2026 IRMAA is based on 2024 income, the MAGI that determines your very first year of Medicare premiums is your income from two years before you turn 65 — roughly age 63. If you’re planning a large Roth conversion, a business sale, or any income spike, doing it at 63–64 can saddle your first Medicare years with IRMAA. Building MAGI awareness into your plans should start before you enroll. See Medicare enrollment periods and what Part B covers for the enrollment timeline.

The Survivor’s IRMAA Cliff

One of the cruelest IRMAA traps hits widows and widowers. While both spouses are alive, a couple uses the married-filing-jointly thresholds — no surcharge until MAGI exceeds $218,000. After a spouse dies, the survivor files as a single taxpayer the following full year, and the threshold is cut nearly in half, to $109,000.

So household income can fall after a spouse’s death while IRMAA appears for the first time. A couple at $200,000 MAGI paid no surcharge; the surviving spouse with $150,000 of income is suddenly in a Part B + Part D surcharge tier. The death of a spouse is a qualifying life-changing event for appeal (below), but the appeal only resets IRMAA to the survivor’s own estimated income — if that income still exceeds the single thresholds, the surcharge stands. This is a core reason survivors should revisit their income plan; see spousal Medicare strategies.

Life-Changing Events That Allow IRMAA Appeals

You can request an IRMAA determination using a more recent year’s income if you experienced a qualifying “life-changing event”:

1. Marriage
2. Divorce or annulment
3. Death of a spouse
4. Work reduction (your hours were reduced by your employer)
5. Work stoppage (retirement, layoff, leaving work to care for a family member)
6. Loss of income-producing property (due to disaster, fraud, or other circumstances beyond your control)
7. Loss of pension income (e.g., your former employer’s pension plan terminated)
8. Receipt of settlement from an employer (employer bankruptcy or settlement)

Notably, a simple market downturn that reduced your investment income is not a qualifying life-changing event. Neither is a one-time event you chose, like a Roth conversion or a home sale. But stopping work — even by choice — is.

How to Appeal IRMAA

The appeal is straightforward. File Form SSA-44 (“Medicare Income-Related Monthly Adjustment Amount — Life-Changing Event”) with your local Social Security office.

Required information:

• The specific life-changing event and when it occurred
• Your estimated income for the more recent year (or the year that better reflects your current situation)
• Supporting documentation (W-2s, tax returns, termination letter, pension termination notice)

You can file in person, by mail, or by calling SSA at 1-800-772-1213. If approved, SSA recalculates your IRMAA using the newer, lower income figure — potentially dropping you into a lower bracket or eliminating the surcharge entirely.

Appeal deadlines: You have until December 31 of the year following the year when the IRMAA took effect to appeal. File as soon as possible after your income drops. For the full step-by-step process, the qualifying-event documentation, and worked examples, see our dedicated guide to IRMAA appeals and life-changing events.

IRMAA and Roth Conversion Strategy

One important tax planning consideration: Roth IRA conversions increase your MAGI in the conversion year and can push you into a higher IRMAA bracket two years later.

For example, if you do a large Roth conversion in 2026 that pushes your 2026 MAGI above $109,000, you’ll face IRMAA surcharges in 2028.

This doesn’t mean Roth conversions are bad — the long-term tax benefits often outweigh IRMAA costs — but the surcharge is a real cost to factor into conversion calculations. A financial planner familiar with Medicare can help you model the full impact.

Similarly, large capital gains events, Required Minimum Distributions (RMDs) that push income above thresholds, or large IRA withdrawals can all trigger IRMAA. Understanding your MAGI in retirement is part of effective Medicare cost planning.

Married Filing Separately: A Costly Status

If you’re married and file your taxes separately, you face much harsher IRMAA treatment. The “married filing separately” brackets are highly compressed: there’s no graduated middle, so even modest income above $109,000 jumps you straight to the second-highest surcharge, and income above $391,000 triggers the top tier.

Most married couples who file separately do so for specific legal or financial reasons. If that’s your situation, be aware of the IRMAA impact. Filing jointly often significantly reduces your combined IRMAA burden.

Comparing IRMAA to Other Medicare Cost Considerations

IRMAA affects your premiums, but there are other Medicare cost variables worth comparing:

• Medigap vs. Medicare Advantage: If you’re paying high IRMAA surcharges on Part B, your total Medicare cost equation shifts significantly. See our comparison of Medicare Advantage vs. Original Medicare and the detailed supplement vs. Advantage cost breakdown to understand how the two systems interact with IRMAA.

• Part D drug coverage: If your IRMAA surcharge on Part D makes your total drug coverage costs high, it’s worth shopping plans during open enrollment. See our guide to Medicare Part D and how Part B vs. Part D split drug costs for details.

• Lower-income beneficiaries: If your income is low rather than high, Medicare Savings Programs may help reduce your Part B premium rather than add to it.

Frequently Asked Questions

Does IRMAA ever go away on its own? Yes. IRMAA is recalculated every year using your MAGI from two years prior. If your income falls below the thresholds, the surcharge automatically disappears the following year — no form needed. It is not a permanent label.

Do my spouse and I each pay IRMAA? Yes, if you’re both enrolled in Medicare and your joint income is over the threshold, each of you pays the surcharge on your own Part B and Part D premiums. That’s why the couple figures in the cost table above are double the per-person amounts.

Does selling my house trigger IRMAA? It can. The taxable capital gain on a home sale counts toward MAGI. The first $250,000 of gain (single) or $500,000 (married filing jointly) on a primary residence is generally excluded, but any gain above that — or the sale of a second home or investment property — can push you over a threshold two years later. A home sale is not a qualifying life-changing event for appeal.

If I delay enrolling in Part B, do I still owe IRMAA? IRMAA only applies once you’re enrolled in Part B and/or Part D. If you’re still working with creditable employer coverage and have delayed Part B, you don’t pay the surcharge yet — but it will apply based on your MAGI once you enroll. See Medicare enrollment periods.

Is the Part D surcharge paid to my drug plan? No. Even though it’s tied to Part D, the IRMAA surcharge is billed to you directly by Medicare (usually deducted from Social Security), separate from the premium you pay your plan.

Key Takeaways

• IRMAA is a surcharge on Medicare Part B and Part D premiums for higher-income beneficiaries
• In 2026, single filers with income above $109,000 and joint filers above $218,000 are subject to IRMAA
• It’s a cliff, not a slope — one dollar over a threshold triggers the full tier surcharge (over $1,100/year per person at Tier 1)
• The top tier adds nearly $7,000/year per person, or close to $14,000 for a couple
• The surcharge is based on income from two years prior (your 2024 return determines 2026 IRMAA), so MAGI planning should start around age 63
• Roth conversions, large capital gains, RMDs, and even tax-exempt muni interest can all push you into IRMAA brackets — QCDs and careful drawdown order can keep MAGI down
• Surviving spouses face a hidden cliff when the threshold halves from joint to single
• If your income dropped due to retirement, divorce, death of spouse, or other qualifying events, you can appeal using Form SSA-44
• IRMAA is re-evaluated each year; a drop in income this year will reduce your surcharge two years from now

Sources

• SSA.gov — Medicare premiums for higher-income beneficiaries (IRMAA)
• SSA.gov — Request to lower your IRMAA
• SSA.gov — Form SSA-44: Medicare IRMAA life-changing event (PDF)
• CMS.gov — 2026 Medicare Parts A & B premiums and deductibles (fact sheet)
• Medicare.gov — Medicare costs

All sources are official government or nonprofit consumer resources, verified July 2026. Medicare and Social Security rules and dollar amounts change annually — confirm current figures at the links above before making decisions.