2026 Medicare IRMAA Brackets and Surcharge Amounts for Federal Retirees

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Quick 2026 IRMAA Facts

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• The 2026 IRMAA brackets are based on 2024 MAGI (the standard two-year lookback rule).

• IRMAA applies to both [Medicare Part B and Part D premiums].

• First surcharge tier begins at $109,000 (single) or $218,000 (married filing jointly).

• 2026 Part B premiums range from $202.90 to $689.90 per month depending on income.

• Part D IRMAA surcharges range from $14.50 to $91.00 per month.

• The top IRMAA bracket remains effectively frozen through at least 2028.

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Why Many Retirees Are Seeing Higher Medicare Premiums in 2026

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Although the 2026 IRMAA income thresholds were adjusted slightly for inflation, the increases were modest (CPI-U rose just +1.02% for the 12 months ending August 2025). As a result, many retirees are crossing IRMAA thresholds not because of lifestyle changes but due to routine income events such as required minimum distributions, pension COLAs, or portfolio gains.

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THE IRMAA "CLIFF" EXPLAINED

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IRMAA does not work like a traditional tax bracket. Once your MAGI exceeds a threshold, the full surcharge for that bracket applies to your premium, not just the amount over the threshold.

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Example: A single retiree with $137,001 in 2024 MAGI pays the same 2026 surcharge as someone earning $170,000 within the same tier. This cliff effect is the most common and most expensive IRMAA surprise federal retirees face.

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What Is IRMAA?

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IRMAA the Income-Related Monthly Adjustment Amount is an income-based surcharge added to standard Medicare Part B and Part D premiums when a beneficiary's Modified Adjusted Gross Income (MAGI) exceeds IRS-defined thresholds. The Social Security Administration determines IRMAA annually using IRS-reported income data and notifies beneficiaries through official determination letters.

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IRMAA applies to all Medicare beneficiaries, including those enrolled in Medicare Advantage prescription drug plans (MA-PD). The 2026 brackets and premium amounts come directly from CMS's official announcement and are summarized in publications released through Medicare.

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What's New in the 2026 IRMAA Brackets

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Several changes shaped the 2026 IRMAA picture:

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Inflation adjustments to thresholds

The first four IRMAA brackets increased modestly based on the CPI-U increase of +1.02% for the 12 months ending August 2025, a smaller adjustment than in recent inflationary years.

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Part B premium increase

The Medicare Part B standard premium for 2026 is $202.90 per month, up from $185.00 in 2025. CMS noted that without specific regulatory action lowering spending on certain medical items, the 2026 Part B premium would have been roughly $11/month higher.

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Surcharge increases

• Part B surcharges increased approximately 3%–9% across the tiers.
• Part D surcharges increased approximately 6%.

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Threshold structure

• First surcharge tier starts at $109,000 MAGI (single) or $218,000 (married filing jointly).
• Top bracket begins at $500,000 (single) or $750,000 (married filing jointly).

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How IRMAA Is Calculated for 2026

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IRMAA is determined using IRS income data, Medicare rules, and inflation-adjusted thresholds. Once the IRS processes your 2024 tax return, the SSA uses your MAGI and filing status to assign you to one of the 2026 IRMAA brackets. This is why timing matters, income from two years prior directly determines your current Medicare costs.

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Medicare starts with your Modified Adjusted Gross Income (MAGI), which includes:

• Adjusted Gross Income (AGI) from your tax return.

• Tax-exempt interest (such as municipal bonds) added back.

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MAGI also reflects income from federal pensions, TSP withdrawals, capital gains, Roth conversions, dividends, and other taxable income streams. Once calculated, your MAGI is compared against the 2026 IRMAA brackets to determine your surcharge tier.

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2026 Medicare Part B Costs

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The Part B premium starts at $202.90 per month but increases significantly based on income, reaching up to $689.90 per month at the top tier. For more detail, see our guide to 2026 Part B premium details.

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2026 Part B IRMAA Brackets (Single and Married Filing Jointly)

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The full breakdown of 2026 Part B premiums by income tier:

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2026 Part B IRMAA (Married Filing Separately)

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MARRIED FILING SEPARATELY HAS A SEVERELY COMPRESSED STRUCTURE

Notice that MFS filers skip directly from the $0 surcharge tier into the second-highest tier as soon as MAGI exceeds $109,000. There is no graduated middle range. Federal retirees with substantial individual income who file separately can face dramatically higher Medicare costs than those filing jointly.

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2026 Part B Immunosuppressive-Only IRMAA Brackets

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For kidney transplant recipients who lose full Medicare coverage after 36 months, immunosuppressive-only Medicare maintains drug coverage. The 2026 IRMAA structure for this population:

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2026 Medicare Part D IRMAA Surcharges

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Part D IRMAA surcharges are paid in addition to your Part D plan's monthly premium. They're paid directly to Medicare not to your Part D insurer.

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Part D IRMAA Married Filing Separately

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Income Sources That Trigger IRMAA

Federal retirees often pay IRMAA without realizing how each income source contributes. Here's the full MAGI breakdown:

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WHY THIS TABLE MATTERS

The two "No" rows at the bottom qualified HSA withdrawals and qualified Roth withdrawals are the most powerful IRMAA management tools available to federal retirees. Income drawn from these sources doesn't increase your MAGI and won't push you into a higher IRMAA tier.

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Why IRMAA Matters Especially for Federal Retirees

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Federal retirees are uniquely exposed to IRMAA because they typically draw income from multiple sources at the same time FERS or CSRS annuities, TSP withdrawals, Social Security benefits, and investment income. Each of these feeds into MAGI, which determines your placement within the IRMAA brackets.

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For many retirees, the combination of a federal pension and required minimum distributions from the TSP is enough to push them into higher IRMAA brackets even if they don't consider themselves high-income earners. This can result in hundreds or even thousands of dollars in additional Medicare costs annually.

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Inflation adjustments to pensions and market-driven portfolio gains can also increase income over time. Because the 2026 IRMAA brackets saw only modest increases, many retirees experienced "bracket creep" without making any major financial changes.

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How IRMAA Is Paid

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IRMAA is collected differently depending on whether you're already receiving Social Security benefits.

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If you're drawing Social Security

Both your Part B premium and the IRMAA surcharge are automatically deducted from your monthly Social Security payment. This means you may see a lower Social Security benefit than expected when IRMAA applies without realizing IRMAA is the cause.

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If you've delayed Social Security

Many federal retirees delay Social Security to maximize their benefits. In that case, IRMAA is billed separately by Medicare. You'll receive the CMS-500 premium bill, usually quarterly, and must pay it directly. Failure to pay on time can result in delinquency notices, coverage interruptions, or complications with reinstatement.

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Part B vs Part D IRMAA

Medicare treats Part B and Part D IRMAA as separate payments. Even if your FEHB or employer plan pays your Part D premium, the IRMAA portion must still be paid directly to Medicare. This surprises many retirees who assume their plan handles all Part D-related charges.

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Payment options

• MyMedicare.gov — the preferred method. Fast, secure, fee-free.
• Bank bill pay — set up automated payments through your bank.
• Medicare Easy Pay — automatic monthly withdrawal directly from your account.
• Mailed payments — sent to the Medicare Premium Collection Center.

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ONE COMMON SURPRISE

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Because IRMAA is tied to your income from two years earlier, you might continue receiving IRMAA bills even after your income decreases unless you file Form SSA-44 for a qualifying life-changing event. Monitoring your mail and MyMedicare account helps prevent missed payments or confusion when surcharges change at the start of a new calendar year.

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Strategies to Reduce or Avoid IRMAA

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IRMAA is predictable and partially manageable. The earlier you plan, the more options you have.

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1. Spread Roth conversions across multiple years

Converting a large traditional balance to Roth in a single year can spike your MAGI and push you into a much higher IRMAA tier. Spread conversions across 3-5 years to avoid bracket-jumping.

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2. Balance income across three buckets

Build retirement income from a mix of:

• Taxable accounts (brokerage, regular savings)
• Tax-deferred accounts (Traditional TSP, Traditional IRA)
• Tax-free accounts (Roth TSP, Roth IRA, HSA)

Drawing from tax-free accounts in years where you're close to an IRMAA threshold can keep your MAGI in a lower tier.

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3. Maximize pre-tax contributions while still working

Every dollar you contribute to a Traditional TSP or pre-tax retirement account reduces your current MAGI which reduces your IRMAA two years later. This is especially valuable in the final 2-3 years before retirement.

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4. Manage capital gains timing

Avoid bunching large capital gains (such as selling appreciated investments or a home above the exclusion) into a single tax year. Spreading gains across multiple years can keep you below IRMAA cliffs.

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5. Use Qualified Charitable Distributions (QCDs) for RMDs

Federal retirees age 70 1⁄2 or older can transfer up to a specified amount directly from a traditional IRA to a qualified charity. The QCD satisfies your RMD without adding to MAGI.

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6. File Form SSA-44 for Life-Changing Events

If your income drops significantly due to a qualifying life-changing event, you can request that SSA recalculate your IRMAA based on current income rather than your two-year-old tax return. Qualifying events include:

• Retirement
• Death of a spouse
• Divorce
• Work reduction
• Loss of income-producing property

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PROTECT YOUR RETIREMENT FROM IRMAA SURPRISES

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Federal Pension Advisors helps federal retirees project future Medicare expenses, optimize TSP and annuity withdrawals, and lower IRMAA exposure legally and efficiently. Free pension and benefits review available.

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Schedule your free Medicare and IRMAA planning review to get clarity on your Medicare future before the next IRMAA determination letter arrives.

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What You Can Do Right Now

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• Review your 2024 tax return and project your 2026 MAGI. If you're close to a threshold, small actions now can save thousands.

• Estimate whether you'll cross an IRMAA threshold in the coming years and consider adjusting withdrawal timing or Roth conversion size.

• Run TSP projections to age 73. Use our TSP calculator to see how RMDs will affect your future MAGI starting at age 73.

• Look at coordinated IRMAA reduction strategies. Read our guide to how to lower IRMAA premiums. There are specific strategies that work especially well for federal retirees.

• Watch the 2026 COLA announcement. Your Social Security and pension 2026 COLA combine with IRMAA changes to determine your net Medicare-related cost in 2026.

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Final Thoughts

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IRMAA can significantly increase Medicare costs, but it's not random, it's predictable, calculable, and manageable. By understanding the finalized 2026 brackets and managing your MAGI strategically across the years before and during retirement, you can stay in control of your healthcare expenses rather than being surprised by them.

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The federal retirees who handle IRMAA best aren't the ones with the lowest income, they're the ones who plan their income years ahead. With a two-year lookback, the decisions you make in 2024 are already determining your 2026 costs. The decisions you make today will determine your costs in 2027 and beyond.

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Frequently Asked Questions

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1. What are the IRMAA income brackets for 2026?

The 2026 IRMAA brackets start at MAGI above $109,000 for single filers and $218,000 for married filing jointly. There are five tiers above the base, with Part B surcharges ranging from $81.20 to $487.00 per month and Part D surcharges from $14.50 to $91.00 per month. Your 2026 IRMAA is based on your 2024 tax return.

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2. How much will Medicare Part B cost in 2026?

The standard Medicare Part B premium for 2026 is $202.90 per month. If IRMAA applies, the total monthly Part B cost ranges from $284.10 up to $689.90, depending on your income tier. The Part B annual deductible for 2026 is $283.

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3. Who has to pay IRMAA in 2026?

Anyone whose 2024 MAGI exceeds $109,000 (single) or $218,000 (married filing jointly) must pay IRMAA in 2026. IRMAA applies even if you're enrolled in a Medicare Advantage plan with drug coverage (MA-PD).

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4. What is IRMAA based on?

IRMAA is based on your Modified Adjusted Gross Income (MAGI) from two years earlier. For 2026 IRMAA, your 2024 tax return determines your tier. MAGI includes your AGI plus tax-exempt interest such as municipal bond income.

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5. Can I appeal my IRMAA determination?

Yes. If your income has dropped significantly due to a qualifying life-changing event, retirement, death of a spouse, divorce, work reduction, or loss of income-producing property you can file Form SSA-44 to request that SSA use your current income instead of your two-year-old tax return.

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6. Does IRMAA apply if I delay Social Security?

Yes. IRMAA applies to your Medicare premiums regardless of whether you've started Social Security. If you've delayed Social Security, IRMAA is billed separately by Medicare via Form CMS-500, typically on a quarterly basis.

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7. Do qualified Roth withdrawals affect IRMAA?

No. Qualified Roth IRA and Roth TSP withdrawals do not count toward MAGI and therefore don't trigger IRMAA. This makes Roth accounts one of the most valuable IRMAA-management tools for federal retirees especially when paired with strategic Roth conversions during low-income years before Medicare eligibility begins.

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DISCLAIMER

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This article is intended for informational and educational purposes only. It should not be considered financial, legal, or tax advice. Individual circumstances vary, and federal retirees should consult with a qualified tax or financial professional before making decisions regarding IRMAA, income management, or Medicare planning. The official 2026 Medicare premium and IRMAA figures are published by CMS and Medicare.gov verify against the most current source before relying on these figures for personal financial decisions.

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