What is IRMAA

IRMAA stands for the Income-Related Monthly Adjustment Amount. IRMAA is a surcharge that is added to your monthly Medicare costs based on the amount of income you are receiving in retirement from various sources such as: pension, Social Security, W2 wages, investments, or a combination of these different types.

In practical terms, IRMAA means that Medicare is not a flat-price program. Most beneficiaries pay the standard Part B premium and their chosen Part D plan premium — but once your income crosses certain thresholds, the federal government adds an extra monthly charge to both. The surcharge applies per person, so a married couple where both spouses are enrolled in Medicare can pay it twice.

IRMAA was created by the Medicare Modernization Act of 2003 and first applied to Part B premiums in 2007. It was extended to Part D prescription drug coverage in 2011. The idea is straightforward: higher-income beneficiaries shoulder a larger share of the true cost of their Medicare coverage, rather than receiving the same taxpayer subsidy as everyone else.

What makes IRMAA uniquely frustrating for retirees is that it is determined by your income from two years ago — and many people first learn it exists when a determination letter from the Social Security Administration arrives in the mail.

Medicare does not use your take-home pay or even your taxable income to determine IRMAA. It uses your Modified Adjusted Gross Income (MAGI) — your adjusted gross income plus tax-exempt interest. For IRMAA purposes, income includes:

Notice what is on that list: nearly every traditional source of retirement income. Required minimum distributions from a traditional IRA count. The taxable portion of your Social Security benefit counts. Even tax-exempt municipal bond interest is added back in when calculating MAGI for Medicare.

Just as important is what is not on the list. Qualified Roth IRA and Roth 401(k) distributions, health savings account (HSA) withdrawals for qualified expenses, life insurance loans, and qualified charitable distributions (QCDs) from an IRA generally do not increase MAGI. This is why the type of income you draw in retirement matters as much as the amount — and why strategies for reducing MAGI sit at the center of IRMAA planning.

Annually, Medicare IRMAA brackets are reviewed and adjusted for both income levels and surcharge amounts for both Medicare Part B and Part D. Below are the 2025 brackets and total monthly Part B premiums, along with the Part D surcharge added on top of your drug plan's premium.

Two things stand out in this table. First, the brackets are cliffs, not phase-ins: crossing a threshold by a single dollar of MAGI moves your entire premium to the next tier for the full year. Second, the surcharges compound across both parts of Medicare — a beneficiary in the top bracket paid over $6,300 more per year in 2025 than a beneficiary at the standard rate, per person.

For historical context, when this page was first published the 2023 standard Part B premium was $164.90 per month, with the first IRMAA threshold at $97,000 (single) and $194,000 (married filing jointly). The thresholds are inflation-adjusted each year, which is why staying current matters. You can find the full detail on our 2025 IRMAA brackets page, along with current and historical IRMAA brackets going back to the program's start.

Each year, the IRS shares tax return data with the Social Security Administration. The SSA looks at your MAGI from two years prior — so your 2025 premiums were based on your 2023 tax return — and compares it against the current year's bracket thresholds. If your MAGI lands above the first threshold, the SSA mails you an Initial IRMAA Determination notice stating the surcharge you will pay.

This two-year lookback is where most IRMAA surprises come from. The income that triggers the surcharge is often income earned before retirement — a final year of full salary, a business sale, a severance package, or a large capital gain from downsizing a home. You may be fully retired and living on far less, yet still be billed as a high earner because of what your tax return showed two years ago.

If you feel as though you should not be in an IRMAA bracket, there is always the option to appeal — the SSA has a specific process for beneficiaries whose income has dropped because of a life-changing event, covered in the next section. In retirement, income is a must, but it must be the right kind of income. Two households can spend identical amounts each month, yet one pays thousands in IRMAA surcharges and the other pays none, purely because of where their income comes from.

Because IRMAA is redetermined annually, a single high-income year usually means a single year of surcharges — and conversely, an income spike in any year of retirement (a Roth conversion, an inherited IRA distribution, a property sale) can create a surcharge two years later. For a full walkthrough of the mechanics, see how IRMAA is calculated.

If you think that you have been placed into an IRMAA bracket unfairly and want to appeal this decision, Medicare and Social Security have created an appeal process to assist you in taking action to correct this.

The primary route is Form SSA-44, "Medicare Income-Related Monthly Adjustment Amount – Life-Changing Event." The SSA will use a more recent, lower-income year to set your premiums if you have experienced one of these qualifying events:

• Work stoppage (retirement) or work reduction
• Marriage, divorce, or annulment
• Death of a spouse
• Loss of income-producing property (beyond your control, such as disaster or theft)
• Loss or reduction of a pension
• Employer settlement payment from a bankruptcy or reorganization

Retirement itself is the most common qualifying event: if your two-year-old tax return reflects your final working years but your income has since fallen, an SSA-44 filing can move you to a lower bracket — or out of IRMAA entirely. If the SSA used incorrect or outdated tax data, you can also request a reconsideration of the determination itself.

We recommend contacting a financial professional to assist you in this appeals process to ensure that you have the correct information submitted to the federal government and the best chance of a positive outcome. Our guide to appealing IRMAA covers the documentation, deadlines, and step-by-step filing process in detail.

For financial advisors, IRMAA has quietly become one of the most consequential — and most overlooked — variables in retirement income planning. It sits at the intersection of tax planning, Social Security timing, and healthcare costs, and it is one of the few "taxes" a client can trigger or avoid based purely on how their withdrawals are sequenced.

Consider the planning decisions that routinely interact with IRMAA brackets:

• Roth conversions — the conversion income lands in MAGI and can push a client over a bracket cliff two years later
• Required minimum distributions — RMDs from large traditional balances can lock clients into IRMAA for life
• Asset location and capital gains harvesting — realized gains count toward MAGI in the year realized
• Social Security claiming — the taxable portion of benefits feeds MAGI
• Charitable strategy — QCDs satisfy RMDs without adding to MAGI

Advisors who model Medicare IRMAA alongside taxes and income can often save clients thousands of dollars a year with no change in lifestyle — just changes in which accounts fund it. This page's original publisher, IRMAA Certified Planner, was created to educate financial professionals on exactly these rules; that educational mission now continues here at RetirementAdvisorPro, where the focus is giving advisors the software to model IRMAA scenarios for real client plans.

Estimating your IRMAA exposure takes three inputs: your MAGI from two years ago, your tax filing status, and the current year's bracket table. Find your MAGI on your tax return (AGI plus any tax-exempt interest), then locate your row in the bracket table above. That is your Part B premium and Part D surcharge for the year.

Projecting IRMAA forward is harder — and more valuable. Future premiums depend on this year's income decisions, next year's RMDs, bracket inflation adjustments, and how Social Security, pension, and portfolio withdrawals stack up in each future tax year. That is a multi-decade, multi-variable projection, which is exactly what retirement income planning software is built for.

RetirementAdvisorPro models IRMAA year by year across a full retirement plan: it flags which years a client crosses a bracket cliff, quantifies the cost, and lets advisors test strategies — Roth conversion timing, withdrawal sequencing, QCDs — that keep MAGI on the right side of the thresholds. If you are a financial professional, you can schedule a free demo to see the IRMAA planning tools in action.

IRMAA is the Income-Related Monthly Adjustment Amount — a surcharge on Medicare Part B and Part D premiums for beneficiaries whose income exceeds annual thresholds. It is calculated from your tax return two years prior, it operates on hard bracket cliffs, and it is reassessed every year.

Because IRMAA is driven by the kind of income you draw and when you draw it, it is one of the most controllable costs in retirement. Awareness of the brackets, smart sequencing of withdrawals, and a timely appeal after a life-changing event can each save thousands of dollars per year — often with no change in spending at all.