IRMAA is the surcharge Medicare adds to your Part B and Part D premiums when your income is above a threshold. It catches people by surprise for one reason: it is based on your tax return from two years ago, not on what you earn now. Enter that income below and this page will show you which bracket you land in and what it adds each month.
Check your bracket
Use the tax return Medicare will look at — see below for which year that is. Nothing is sent anywhere; this runs in your browser.
Which year’s income does Medicare use?
The return from two years earlier. Your premium this year is set by the tax return you filed for the year before last, because that is the most recent return the IRS has finished processing when the figures are set. If that return was not available, Medicare goes back one more year.
This two-year lag is why IRMAA lands on people who are no longer earning what triggered it. The year you sold a business, exercised options, took a large distribution, or sold a property is the year that sets your premium two years later — often the year after you retired, when your income has already dropped.
Why did my premium go up when my income went down?
Almost always the two-year lag. The surcharge is looking at a year you may barely remember. It is not a mistake, and calling Medicare will not change it — but it may still be reversible, which is the next section.
Can I get IRMAA reduced or removed?
Yes, in two situations, and both are underused.
The first is a life-changing event. Social Security will recalculate using your current income rather than the two-year-old return if you had one of a defined list of events: marriage, divorce or annulment, death of a spouse, you or your spouse stopping work or reducing hours, loss of income-producing property, loss or reduction of a pension, or an employer settlement payment. Retirement counts — it is “work stoppage,” and it is the most common qualifying event there is. The form is SSA-44.
The second is a plain error: the return Medicare used was amended, or the IRS sent the wrong information. Both are fixable with documentation.
Notice what is not on the list — simply having lower income now, with no qualifying event behind it. In that case the surcharge stands for the year and falls away on its own when the newer return catches up.
How the brackets work, and why the edges matter
IRMAA is a cliff, not a slope. There is no gradual phase-in: one dollar over a threshold moves you into the next bracket for the entire year, for both Part B and Part D. Crossing the first threshold by a single dollar costs the same as crossing it by twenty thousand.
That is what makes IRMAA a planning problem rather than a billing problem. The decisions that move you across a line — a Roth conversion, when to take a capital gain, which account to draw from — are made in the year that counts, two years before the bill arrives. By the time you see the surcharge, the year that caused it is closed.
What this page does not do
It tells you the bracket and the surcharge. It does not tell you whether a Roth conversion is worth the IRMAA it triggers, how to sequence withdrawals across account types, or how this interacts with the taxation of your Social Security. Those are real questions and they are not one-page questions — and some of them belong with your tax professional rather than with me.
What I can help with is the Medicare side: whether a life-changing event applies to you, what SSA-44 needs, and how the surcharge interacts with the coverage you choose. There is no cost for that conversation. Pick a time or call 770-765-7007.
If you are still working out your enrollment timing, the enrollment calculator covers that, and what Medicare costs lays out the pieces this sits on top of.
Common questions
Does IRMAA apply to Medicare Advantage or a supplement?
It applies to Part B and Part D. If you have a Medicare Advantage plan you still pay your Part B premium, so the Part B surcharge still reaches you, and the Part D portion applies through the drug coverage inside the plan. A Medicare Supplement premium is set by the insurance company and is not affected by IRMAA.
Is IRMAA permanent?
No. It is decided year by year. If the income that triggered it was a one-off, the surcharge falls away once a lower return works its way through — usually the following year.
How will I find out I owe it?
Social Security sends an initial determination notice, generally toward the end of the year, telling you what your premiums will be. That notice is also what starts the clock on appealing or filing SSA-44, so it is worth opening rather than filing away.
What counts toward the income figure?
It is your adjusted gross income plus tax-exempt interest. That last part surprises people — municipal bond interest escapes income tax but still counts here.
Does one dollar over really move me up a bracket?
Yes. That is exactly how the thresholds work, and it is the strongest argument for looking at this two years ahead rather than reacting to the notice when it arrives.