Medicare IRMAA Brackets 2026: How to Avoid the High-Income Surcharge
Medicare IRMAA brackets in 2026 use your 2024 income and can add $850+ a year to Part B and Part D. Here's how the tiers work and how to stay under them.
You retired comfortably, kept your income modest, and then a letter from the Social Security Administration arrived telling you your Medicare premium is going up by $74 a month — not because you did anything wrong this year, but because of a tax return you filed back in 2024. That surprise has a name: the Medicare IRMAA brackets, and in 2026 they catch more middle-class retirees than most people expect.
IRMAA stands for Income-Related Monthly Adjustment Amount — a surcharge added on top of standard Medicare Part B and Part D premiums for higher earners. The frustrating part is the two-year lookback: your 2026 Medicare IRMAA brackets are calculated from your 2024 modified adjusted gross income (MAGI). A one-time event in 2024 — a Roth conversion, a home sale, an inherited IRA distribution — can quietly push you into a surcharge tier today.
What IRMAA Is and Why It Hits in 2026
Most people on Medicare pay the standard Part B premium, which the Centers for Medicare & Medicaid Services (CMS) sets each year. For 2025 that base premium was $185.00 per month. CMS finalizes the 2026 figure in the fall, and based on trustee projections it is expected to rise modestly, likely into the low $200s per month.
If your income sits above the first threshold, you pay that base premium plus an IRMAA surcharge on both Part B and your Part D drug plan. The surcharge is not gradual — it works as a cliff. Go one dollar over a bracket line and you jump to the next full surcharge tier for the entire year.
That cliff design is what makes IRMAA worth planning around. Unlike federal income tax, where the next dollar is taxed at a marginal rate, here a single dollar of MAGI can cost you hundreds of dollars over twelve months.
The 2026 IRMAA Brackets, Tier by Tier
The brackets adjust for inflation each year, and CMS publishes the official 2026 numbers in late 2025. The table below uses the most recent confirmed thresholds with the modest inflation adjustment expected for 2026 — treat the dollar figures as close estimates until CMS releases the final notice. What matters is the structure, which does not change.
| Single filer MAGI (2024) | Married filing jointly (2024) | Part B surcharge/mo | Part D surcharge/mo |
|---|---|---|---|
| ≤ $109,000 | ≤ $218,000 | $0 (base only) | $0 |
| $109,001 – $137,000 | $218,001 – $274,000 | ~$74 | ~$14 |
| $137,001 – $171,000 | $274,001 – $342,000 | ~$185 | ~$36 |
| $171,001 – $205,000 | $342,001 – $410,000 | ~$295 | ~$58 |
| $205,001 – $500,000 | $410,001 – $750,000 | ~$406 | ~$81 |
| > $500,000 | > $750,000 | ~$443 | ~$88 |
A married couple where both spouses are on Medicare pays the surcharge twice — one IRMAA for each person. So a couple landing in the second tier isn’t looking at $74 a month; they’re looking at roughly $176 a month combined across Part B and Part D, or more than $2,100 a year in extra premiums.
Why your 2024 return is the one that counts
The Social Security Administration pulls the most recent return the IRS has on file, which is your 2024 tax year data for 2026 premiums. MAGI for IRMAA means your adjusted gross income plus tax-exempt interest (like muni bond interest). That means even “tax-free” income can push you over a line.
This is exactly why a Roth IRA conversion ladder needs to be sized carefully — a conversion that looks tax-smart in isolation adds directly to the MAGI that sets your Medicare premium two years later.
What It Means For Your Retirement Income Plan
The retirees most exposed to IRMAA are rarely the wealthiest. They are people with a normal income year that got a one-time bump: selling a rental property, taking a large inherited IRA distribution under the 10-year rule, or realizing capital gains to rebalance.
Required minimum distributions (RMDs) are the other quiet driver. Once RMDs begin, that taxable income lands on top of Social Security and pensions, and for retirees with large traditional 401(k) balances it can permanently park them in an IRMAA tier. Strategies like Roth conversions before RMDs start trade a tax bill today for lower MAGI later — but the conversion year itself can trigger IRMAA, so timing matters.
The takeaway: IRMAA turns income timing into real money. The same total income spread evenly across years may avoid surcharges that a lumpy income pattern would trigger.
Action Steps to Stay Under the IRMAA Brackets
- Know your gap to the next cliff. Pull your projected MAGI and compare it to the bracket line above you. If you’re within a few thousand dollars, every additional dollar of income deserves scrutiny.
- Time Roth conversions in lower-income years. Convert in years before Social Security and RMDs stack up, and size each conversion to “fill up” to just below an IRMAA line rather than blowing past it.
- Use Qualified Charitable Distributions (QCDs). If you’re 70½ or older, a QCD sends IRA money directly to charity and is excluded from MAGI — it satisfies part of your RMD without raising your IRMAA tier.
- Harvest gains deliberately. Spread asset sales across tax years instead of one large realization. Pairing this with tax-loss harvesting can offset gains and keep MAGI down.
- File Form SSA-44 after a life-changing event. If a one-time income spike won’t repeat — or if you retired and your income dropped — you can ask SSA to use a more recent, lower year.
Frequently Asked Questions
Is IRMAA permanent once I’m in a bracket?
No. IRMAA is recalculated every year using the relevant tax return. A high-income year fades out of the calculation two years later, so a one-time spike means one year of surcharges, not a life sentence.
Does tax-exempt muni bond interest count toward IRMAA?
Yes. MAGI for IRMAA adds tax-exempt interest back in. This surprises many retirees who shifted into munis specifically for tax-free income.
Can I appeal an IRMAA surcharge?
Yes — file Form SSA-44 for a “life-changing event” such as retirement, divorce, death of a spouse, or loss of pension income. SSA can then use a more recent year that reflects your real income.
Do both spouses pay IRMAA separately?
Yes. If both spouses are enrolled in Medicare and the couple’s joint MAGI crosses a threshold, each spouse pays the surcharge on their own Part B and Part D premiums.
How is the 2026 surcharge actually billed?
For most retirees it’s deducted directly from the Social Security benefit. If you aren’t yet collecting Social Security, Medicare bills you separately.
Bottom Line
The Medicare IRMAA brackets in 2026 are driven by your 2024 income, and because they work as cliffs, a single dollar can cost you over $850 a year — more for couples. Plan your conversions, withdrawals, and asset sales around the bracket lines, and use QCDs and Form SSA-44 when they apply.
This article is for informational purposes only and does not constitute investment or tax advice. Always do your own research before making financial decisions.
For more on coordinating withdrawals and tax-advantaged accounts in retirement, see our guides on stacking the HSA triple tax advantage and the NUA strategy for company stock in a 401(k).
Sources: CMS Medicare Costs · Social Security Administration — Medicare Premiums (IRMAA) · IRS — Retirement Topics