What Is IRMAA? The 2026 Medicare Surcharge on Higher Incomes, Explained
What Is IRMAA? The 2026 Medicare Surcharge on Higher Incomes, Explained
A plain-English guide to the Income-Related Monthly Adjustment Amount — the 2026 brackets, what counts as income, the two-year lookback, and the life-changing-event appeal.
Updated for 2026 · Read time: ~10 min · Category: Medicare & Retirement Income · Educational
Most people budget for their Medicare Part B premium as a single, predictable number. Then a higher-income household opens a Social Security statement and finds the premium is hundreds of dollars a month larger than expected — with no obvious explanation on the page. The cause usually has an unfamiliar name: IRMAA, the Income-Related Monthly Adjustment Amount.
IRMAA is not a penalty and it is not a mistake. It is a surcharge built into the Medicare rules, and it follows a set of brackets, timing quirks, and income definitions that are worth understanding before they show up on a statement. This guide walks through the vocabulary and the 2026 figures so the concept is clear. It is educational only — not advice, and not a recommendation of any product or strategy.
What IRMAA Actually Stands For
IRMAA stands for Income-Related Monthly Adjustment Amount. In plain English, it is an extra amount added on top of the standard Medicare Part B (medical) and Part D (prescription drug) premiums for beneficiaries whose income is above certain thresholds. Lower- and middle-income beneficiaries pay the standard premium; higher-income beneficiaries pay the standard premium plus the surcharge.
A few things make IRMAA distinctive. It applies to both Part B and Part D at the same time. It is set by the federal government and adjusted each year. And it is based on your income from a tax return filed two years earlier — a detail that surprises a lot of people, and one we come back to below.
Tip from Alfred:
Think of the standard Part B premium as the “cover charge” everyone pays to get in. IRMAA is a surcharge added to the ticket for higher-income guests. Same door, same coverage — just a different price depending on the income the government sees on file.
The 2026 IRMAA Brackets
The Centers for Medicare & Medicaid Services published the 2026 figures on November 14, 2025, effective January 1, 2026. The standard 2026 Part B premium is $202.90 per month, and the average standalone Part D premium is about $34.50. Above the thresholds, the surcharge climbs across five tiers. The table below shows the 2026 schedule, based on your 2024 income.
2026 IRMAA schedule (amounts are per person, per month). These are the official federal figures for 2026 and are adjusted annually — confirm current amounts at SSA.gov and Medicare.gov.
| 2024 income — Single | 2024 income — Married filing jointly | Part B (surcharge / total) | Part D surcharge |
|---|---|---|---|
| $109,000 or less | $218,000 or less | $0 / $202.90 | $0 |
| $109,001 – $137,000 | $218,001 – $274,000 | +$81.20 / $284.10 | +$14.50 |
| $137,001 – $171,000 | $274,001 – $342,000 | +$202.90 / $405.80 | +$37.50 |
| $171,001 – $205,000 | $342,001 – $410,000 | +$324.60 / $527.50 | +$60.40 |
| $205,001 – $499,999 | $410,001 – $749,999 | +$446.30 / $649.20 | +$83.30 |
| $500,000 or more | $750,000 or more | +$487.00 / $689.90 | +$91.00 |
At the top of the scale, the combined Part B and Part D surcharge is $487.00 + $91.00 = $578.00 per month — roughly $6,936 per person per year above the base premiums. Married couples where both spouses are on Medicare can each owe a surcharge. (Note a quirk: for married-filing-jointly, most thresholds are double the single amount, but the top bracket is $750,000 rather than $1,000,000.)
Why It’s a Cliff, Not a Ramp
IRMAA does not phase in gradually. It works as a series of cliffs. Crossing a threshold by a single dollar moves the entire premium into the next tier for the whole year — on both Part B and Part D at once.
⚠️ The one-dollar cliff (illustrative). Consider two single filers with 2024 income right at the first line. One reports $137,000 and stays in the first surcharge tier: +$81.20/month on Part B. The other reports $137,001 — one dollar more — and lands in the next tier: +$202.90/month on Part B, plus a larger Part D surcharge. That single dollar of reported income changes the Part B surcharge by more than $120 a month for the year. This is an illustration of how the brackets work, not a recommendation about anyone’s income.
The Two-Year Lookback
Here is the timing detail that catches people off guard: your IRMAA in a given year is based on the tax return from two years earlier. Your 2026 surcharge is determined by your 2024 income, because that is the most recent return the Social Security Administration can obtain from the IRS when it sets 2026 premiums in late 2025.
That two-year gap means the income that sets today’s Medicare premium was earned — and, in many cases, already spent or reinvested — years ago. A one-time event well in the past, such as a large capital gain or a big retirement-account withdrawal, can quietly raise a premium long after the fact.
Tip from Alfred:
IRMAA is like a photograph taken two years ago that arrives in the mail today. The picture is already developed — the income year is closed. That is exactly why the vocabulary is worth learning early, while the years that matter are still in front of you.
What Counts as Income (MAGI)
IRMAA is based on Modified Adjusted Gross Income (MAGI), not simply your salary or your taxable income. For most people, the IRMAA version of MAGI is your Adjusted Gross Income (Form 1040, Line 11) plus your tax-exempt interest (Line 2a). Sources that commonly feed into it include:
- Wages, self-employment, and business income
- The taxable portion of Social Security benefits
- Distributions from traditional IRAs, 401(k)s, and other tax-deferred accounts — including Roth conversions in the year they occur
- Taxable interest, dividends, and capital gains
- Pension, annuity, rental, and royalty income
⚠️ The “tax-free” add-back. A detail that surprises many retirees: tax-exempt interest — such as interest from municipal bonds — is added back in for the IRMAA calculation. Income that is tax-free for income-tax purposes can still count toward an IRMAA threshold. It is one of the more common reasons a household lands just over a bracket line.
Life-Changing Events and the SSA-44 Appeal
Because IRMAA looks back two years, it can reflect income from a period that no longer describes your situation — for example, if you have since retired or lost a spouse and your income has dropped. The Social Security Administration recognizes certain “life-changing events” and provides a form, SSA-44, to ask that the surcharge be based on more recent income instead of the two-year-old return.
Events the SSA lists include marriage, divorce or annulment, death of a spouse, work stoppage or reduction, loss of income-producing property, and loss of certain pension income. Whether a given situation qualifies, and what documentation is needed, are questions the SSA answers case by case — and they are exactly the kind of questions people bring to a licensed professional. The form is available at SSA.gov.
Where Are You in the Timeline?
IRMAA lands differently depending on where someone sits relative to Medicare enrollment. Below are common situations and the questions that tend to come up in each — framed for understanding, not as instructions.
Still a few years from 65
The income earned now is what will be “looked back on” when premiums are first set. A question that commonly comes up: which of these years fall inside the two-year window for the first Medicare premium, and what income is expected in them?
Newly enrolled in Medicare
The first premium reflects a return from two years ago. A common question: does that older return still describe the household’s income, or has something changed enough that an SSA-44 review is worth discussing?
Already paying an IRMAA surcharge
A common question: which bracket applies, how close is the household to the next line, and is any of the income that pushed it there a one-time event that will not repeat?
Recent life change (retirement, loss of a spouse)
A common question: does the change qualify as a life-changing event for SSA-44 purposes, and what documentation would the SSA expect?
Ideas People Commonly Discuss With a Professional
When IRMAA comes up in planning conversations, a handful of concepts are widely discussed. They are described here as vocabulary and trade-offs to understand, not as steps to take — the right choice depends entirely on an individual’s full financial picture, and these decisions involve tax and investment questions that belong with a qualified tax professional and advisor.
One widely discussed framework is managing MAGI in the “lookback” years. Because MAGI is what the brackets measure, people often ask their advisors how different sources of income — traditional-account withdrawals, Roth conversions, capital gains, municipal-bond interest — flow into MAGI, and how the timing of those items interacts with the two-year lookback. There are genuine trade-offs on every side: for example, a Roth conversion raises MAGI in the year it happens (potentially affecting a future IRMAA) while changing the tax character of later withdrawals. None of that is one-size-fits-all, which is why it is a conversation rather than a rule.
The point of understanding the vocabulary is simply this: the decisions that affect a Medicare premium often happen years before the bill arrives, so the conversation is more useful early than late.
Want to walk through it with a person, not a table?
A no-cost Retirement Essentials meeting is a place to ask these questions about your own situation.
Frequently Asked Questions
Does everyone on Medicare pay IRMAA?
No. Most beneficiaries pay the standard premium. In 2026, the surcharge only applies to single filers with 2024 income above $109,000 or joint filers above $218,000.
Is IRMAA based on this year’s income?
No — it is based on the tax return from two years earlier. The 2026 surcharge uses 2024 income.
Does tax-exempt interest really count?
Yes. For the IRMAA MAGI calculation, tax-exempt interest (such as municipal-bond interest) is added back to Adjusted Gross Income.
What if my income dropped after a life change?
The SSA allows a request to use more recent income for certain life-changing events, using Form SSA-44. Whether a situation qualifies is decided by the SSA.
Do both spouses pay a surcharge?
If both spouses are enrolled in Medicare and the household is above a threshold, each spouse can owe a Part B and Part D surcharge based on the joint income.
How is the surcharge collected?
The Part B surcharge is typically deducted from a Social Security payment. The Part D surcharge is billed separately by Medicare, even when the drug plan premium is paid to a private insurer.
