Medicare premiums and your tax return: the income surcharge
Your Medicare premium is set by the income on your return from two years back. What crosses the line, how the ladder works, and what to do if income falls.
Quick answers
- Why did my Medicare premium go up?
- Because of the income on the tax return you filed two years ago. Above a threshold, Social Security adds an income-related amount to your Part B premium and to your drug plan premium.
- I retired this year. Can I get the surcharge reduced?
- You can ask. Where a life-changing event has cut your household income, Social Security can lower the extra amount. Ask them rather than the IRS, since the surcharge is not a tax.
- Are Medicare premiums tax deductible?
- Part B and Part D premiums count as medical expenses. That only helps if you itemize and your total medical costs clear the floor, so many people get nothing from it.
Your Medicare premium is worked out from the income shown on a tax return two years old, so what you pay in 2026 traces back to the return covering 2024. That lag is why a premium can climb in a year when your income has already dropped.
The two-year lag
Above a certain level of modified adjusted gross income the premium stops being the standard one, and Social Security is the body that writes to tell you so. The income it works from is neither this year's nor last year's. It comes off the return covering the year before last, which is normally the most recent return the agency has to hand.
Put that on a calendar and the surprise explains itself. The year that fixes the premium is often the year of a house sale, a Roth conversion, or a last year of full-time work. It is a year that ended long before the letter arrived, and it may look nothing at all like the one you are actually living in.
Where the line sits, and how the ladder behaves
At or below the threshold you pay the standard premium. Above it you pay that plus an amount set by where your income fell.
| Standard monthly Medicare Part B premium | $202.90 | Medicare.gov, Medicare costs, Part B premium |
|---|---|---|
| Modified AGI from two years earlier above which a higher Part B premium applies, individual return or married filing separately | $109,000 | Medicare.gov, Medicare costs, Who pays a higher Part B premium because of income? |
| Modified AGI from two years earlier above which a higher Part B premium applies, joint return | $218,000 | Medicare.gov, Medicare costs, Who pays a higher Part B premium because of income? |
| Highest monthly Medicare Part B premium in the income-related ladder | $689.90 | Medicare.gov, Medicare costs, Who pays a higher Part B premium because of income? |
Counting the standard one there are six bands, and each is a step rather than a slope. A single dollar past a band's edge moves you onto the next premium for the whole of the year, which is why this is worth checking in December rather than in June.
The case people miss is married filing separately. That column is a much shorter ladder. It opens at the same first threshold as an individual return and then reaches the highest bands far sooner.
Part D has its own surcharge
A drug plan carries its own income-related monthly adjustment amount, worked out from how you file and from the same two-year-old return. It is added on top of whatever your plan charges rather than taking the place of it, and it runs off the same income thresholds as Part B. The two surcharges are separate and both can apply in the same year, so the total increase is often larger than the Part B ladder alone would suggest.
When your income has already fallen
There is a remedy, and it is the one genuinely actionable thing here. Where a life-changing event has cut what the household brings in, you can ask Social Security to bring the extra amount down. The events readers describe are retirement, the death of a spouse, a divorce, a job loss; those are the situations people bring rather than an official list.
Two practical points go with it. The request goes to Social Security and not to the IRS, because the surcharge is not a tax and the IRS does not set it. And ask as soon as the letter lands, with whatever proves the new income level already gathered, since the surcharge otherwise runs on for the year.
Are the premiums deductible
Part B premiums count as a medical expense, and Part D premiums can be counted as one too. That matters less often than it sounds. Medical expenses reach a return only if you itemize, and only the part above a floor does anything at all, so many people get nothing from it. The medical expense deduction carries the floor and the full list of what qualifies.
A better route exists for anyone it fits. Someone self-employed with a net profit for the year may be able to take health insurance costs as an adjustment to income instead of as an itemized deduction, and the instructions for that deduction say Medicare premiums you pay voluntarily for coverage in your own name, of a kind similar to qualifying private health insurance, can go into the calculation. Its conditions travel with it: the plan has to be established under your trade or business, the deduction cannot come to more than your earned income from that business, and no premium counts for a month in which you could have joined a health plan that your own employer subsidized, or one paid for in part by a spouse's employer or by the employer of a dependent or of your child under twenty-seven.
What to do in a year you expect a big number
A Roth conversion, a house sale, a large distribution or a lump sum all land on the return that will set a premium two years later. The planning therefore belongs in the year of the event, not in the year of the letter. Roth or traditional, and what a conversion costs covers the first of those, and is Social Security taxable covers the income that sits underneath most of these returns.
The last honest line is the arithmetic of a step. Crossing a band by a small amount costs exactly what crossing it by a large amount costs, which is what makes an hour spent on this in December worth more than a month spent on it in the spring.