2026 IRMAA Brackets: How High-Income Retirees Avoid a Medicare Premium Surcharge

What Is IRMAA and Who Pays It?

IRMAA stands for Income-Related Monthly Adjustment Amount. It is not a penalty — it is a sliding-scale surcharge Medicare adds to your Part B (medical) and Part D (drug) premiums when your income is above a set threshold. Congress created IRMAA in 2003 and expanded it over time to shift more Medicare costs to higher earners.

Think of the standard Part B premium ($202.90 in 2026) as the base everyone pays; IRMAA is the markup. It is collected automatically by reducing your Social Security check, or by direct bill if you are not yet collecting Social Security. Roughly 7% of beneficiaries pay IRMAA in a given year.

IRMAA applies separately to Part B and Part D. There is no IRMAA on Part A premiums (most people pay $0 for Part A). If you have a Medicare Advantage plan with drug coverage, you still owe the Part D IRMAA surcharge.

The Two-Year Lookback

The most important IRMAA concept is the two-year lookback. Social Security does not ask for your current income — it uses the MAGI from the tax return the IRS has on file, typically two years old. In 2026, that means your 2024 return determines whether you pay IRMAA and which tier you land in.

This creates a real problem for new retirees: someone who earned a high salary in 2024 but retired in 2025 may still face IRMAA in 2026. The upside is a two-year runway — income you reduce today affects your IRMAA two years from now.

MAGI for IRMAA is your Adjusted Gross Income plus tax-exempt interest (such as municipal bond interest). It does not include Roth distributions, return of basis, or HSA withdrawals — which is why those are popular IRMAA-management tools.

2026 IRMAA Brackets and Surcharges

The 2026 figures below reflect the amounts published by Social Security. The standard Part B premium is $202.90/month, and IRMAA adds a surcharge on top.

For single filers, the tiers begin at MAGI above $109,000 and rise through five brackets up to MAGI of $500,000 and above, where the total Part B premium reaches $689.90/month. For married filing jointly, the same surcharge amounts apply but the income thresholds are doubled (starting above $218,000). Married filing separately uses a compressed schedule.

Part D surcharges use the same income thresholds and range from roughly $14.50 to $91.00/month, added on top of your specific Part D plan's premium. Because exact bracket dollar amounts are adjusted periodically, confirm the current figures at Medicare.gov or SSA before relying on them.

The Cliff Effect: Why One Dollar Can Cost Thousands

IRMAA brackets work like a cliff, not a gradual ramp. Unlike income tax, where only dollars above a threshold are taxed at the higher rate, crossing an IRMAA threshold by a single dollar bumps your entire Part B and Part D premium to the next tier for the whole year.

Example: a single filer just under a bracket boundary pays the lower tier's premium; earning $1 more pushes them to the next tier and can add well over $1,000 a year — triggered by that single dollar.

This makes tax planning in the year two years before enrollment highly valuable. A planner or CPA who knows your IRMAA tier can help you decide whether to realize a capital gain or do a Roth conversion this year, or defer it to avoid crossing a boundary.

Part B vs. Part D IRMAA

Both carry surcharges but work slightly differently. Part B is one published total premium per tier regardless of your Medigap plan. Part D surcharges are additive — they pile on top of whatever your drug plan charges.

If you are in a Medicare Advantage plan that includes drug coverage, you still pay the Part D IRMAA surcharge; the surcharge follows the beneficiary, not the plan type.

The Part B surcharge is collected by Social Security. If you're collecting benefits, it comes out of your check; if not (common for early retirees who delayed benefits), Social Security bills you — set up autopay so a missed bill doesn't trigger disenrollment.

How to Appeal IRMAA After a Life-Changing Event

If your income dropped after the lookback year due to a qualifying life-changing event, you don't have to wait two years. File Form SSA-44 ('Medicare Income-Related Monthly Adjustment Amount — Life-Changing Event') to ask Social Security to use more recent income.

Social Security recognizes seven qualifying events: marriage, divorce or annulment, death of a spouse, work stoppage, work reduction, loss of income-producing property, and loss or reduction of pension income. A voluntary retirement counts as 'work stoppage' — a critical point for people who retire in their early 60s.

Download SSA-44 from SSA.gov, attach documentation (final pay stub, termination letter, divorce decree, death certificate), and submit it to your local office. If approved, the corrected premium typically takes effect within a few months, and any overpaid surcharges are refunded.

Strategies to Reduce Your MAGI

Because IRMAA is driven by MAGI with a two-year lookback, the most effective moves happen before you cross a boundary in the target tax year. Levers include maximizing pre-tax retirement contributions, harvesting capital losses to offset gains, and timing Roth conversions to a year when you're already above a boundary rather than just below one.

Two strategies are especially powerful for retirees. Qualified Charitable Distributions: if you're 70½ or older, you can donate directly from your IRA to a qualified charity and exclude that amount from MAGI entirely. And HSA contributions (while still working under a high-deductible plan before Medicare) reduce AGI and grow tax-free — but you cannot contribute once on Medicare.

Planning around IRMAA is not about avoiding your fair share — it's about not letting a poorly timed Roth conversion or one-time sale push you into a higher tier unnecessarily. Even a one-year tier reduction can save a couple thousands. Work with a fee-only planner or CPA who models IRMAA each year within two years of enrollment.