2026 Medicare IRMAA Brackets, Premiums, and Planning Guide for Federal Retirees

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The Centers for Medicare & Medicaid Services (CMS) has officially finalized 2026 Medicare premiums and IRMAA brackets, confirming a meaningful increase in costs for many retirees.

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For 2026, the standard Medicare Part B premium is $202.90 per month, but higher-income beneficiaries will pay significantly more due to Income-Related Monthly Adjustment Amount (IRMAA) surcharges. Depending on income, total Part B premiums now range from $202.90 to $689.90 per month, with additional surcharges applied to Medicare Part D.

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This isn’t just a routine adjustment. According to CMS, the 2026 premium increase is driven by rising healthcare costs and utilization trends, pushing Part B premiums up from $185.00 in 2025 to $202.90 in 2026.

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For federal retirees, the real impact goes deeper.

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Medicare IRMAA is determined using your Modified Adjusted Gross Income (MAGI) from two years prior, meaning your 2024 income directly determines what you will pay in 2026. This calculation is administered by the Social Security Administration, which uses IRS tax return data to assign surcharge tiers.

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Income sources that trigger IRMAA include:

• Federal annuity (FERS/CSRS)
  
  
• Thrift Savings Plan (TSP) withdrawals
  
  
• Social Security benefits (partially taxable)
  
  
• Roth conversions
  
  
• Capital gains and investment income
  
  

Because of this structure, IRMAA is not just a Medicare issue—it’s a tax and income planning problem that begins years before retirement decisions are made.

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The Centers for Medicare & Medicaid Services (CMS) has officially released the 2026 IRMAA brackets and Medicare Part B premium adjustments, confirming higher costs for many retirees.

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For 2026, the standard Part B premium is $202.90 per month, but your actual cost depends on your income. Under the 2026 Medicare IRMAA brackets, higher-income beneficiaries will pay between $202.90 and $689.90 per month for Part B, along with additional surcharges applied to Medicare Part D.

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These Medicare 2026 IRMAA brackets are based on your 2024 Modified Adjusted Gross Income (MAGI), following the standard two-year lookback rule used by the Social Security Administration. The SSA applies IRMAA using a structured, income-based sliding scale that considers both your reported income and tax filing status. Because Medicare uses a two-year lookback rule, income decisions made in 2024 directly determine Medicare premiums in 2026, as administered by the Social Security Administration (SSA).

Income sources that trigger IRMAA include:

• Federal annuity (FERS/CSRS)
  
  
• Thrift Savings Plan (TSP) withdrawals
  
  
• Social Security benefits (partially taxable)
  
  
• Roth conversions
  
  
• Capital gains and investment income

This income is measured using Modified Adjusted Gross Income (MAGI), a tax-based calculation defined by the IRS, and is used to determine whether additional Medicare surcharges apply.

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These income-related adjustments known as IRMAA are applied by the Social Security Administration to both Part B and Part D premiums for higher-income beneficiaries.

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For federal retirees, this creates a critical planning challenge.

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Income from multiple sources including federal annuity payments (FERS or CSRS), Thrift Savings Plan (TSP) withdrawals, Social Security benefits, Roth conversions, and capital gains all count toward MAGI and can push you into higher IRMAA brackets in 2026.

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Because of this, IRMAA is not just a Medicare issue, it is a forward-looking tax calculation problem, where even small income changes can significantly increase your healthcare costs.

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Quick 2026 IRMAA Facts 

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• The 2026 IRMAA brackets are based on 2024 MAGI (2-year lookback rule)
  
  
• Applies to both Medicare Part B and Part D premiums
  
  
• First surcharge tier begins at:
  
  
  • $109,000 (single filers)
    
    
  • $218,000 (married filing jointly)
    
    
• Part B premiums for 2026 range from $202.90 to $689.90 per month
  
  
• Part D IRMAA surcharges range from $14.50 to $91.00 per month
  
  
• The top IRMAA bracket remains effectively frozen through at least 2028
  
  

These thresholds are part of the broader IRMAA calculation for 2026, which determines your Medicare surcharges

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Why Many Retirees Are Seeing Higher Medicare Premiums in 2026

Although the 2026 IRMAA income thresholds were adjusted slightly for inflation, the increases were modest. 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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IRMAA operates as a cliff, not a progressive system. Exceeding a threshold by even one dollar results in the full surcharge for that tier, rather than applying only to the excess income. This structure makes IRMAA one of the most common and costly Medicare surprises for retirees.
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What Is IRMAA?

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IRMAA (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 exceeds IRS-defined thresholds.

IRMAA applies to all Medicare beneficiaries, including those enrolled in Medicare Advantage prescription drug plans (MA-PD). The SSA determines IRMAA annually using IRS-reported income data and notifies beneficiaries of surcharges through official determination letters.
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Official Source of 2026 Medicare and IRMAA Data

The 2026 Medicare premiums, deductibles, and IRMAA surcharges are published by the Centers for Medicare & Medicaid Services and summarized in official publications released through Medicare.gov. These figures are finalized annually following statutory formulas and inflation indexing rules.

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What’s New in the 2026 IRMAA Brackets?

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Inflation Adjustments Applied

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The first four IRMAA brackets increased slightly based on the CPI-U increase of +1.02% for the 12 months ending August 2025.
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2026 Standard Premium Released

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• Medicare Part B standard premium (2026): $202.90
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IRMAA Surcharges Finalized

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• Part B surcharges increased ~3%–9%
  
  
• Part D surcharges increased ~6%

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2026 Bracket Thresholds

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• First surcharge tier starts at:
  $109,000 MAGI (single)
  $218,000 MAGI (married filing jointly)
• Top bracket begins at:
  • $500,000 (single)
  • $750,000 (married filing jointly
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How IRMAA Is Calculated (2026)

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IRMAA is determined using IRS income data, Medicare rules, and inflation-adjusted thresholds. After the IRS processes your 2024 tax return, the Social Security Administration (SSA) uses your MAGI and filing status to place you into one of the 2026 IRMAA brackets. This is why timing matters, income from two years prior directly affects your current Medicare costs.

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

• Adjusted Gross Income (AGI)
  
  
• Tax-exempt interest (such as municipal bonds)
  
  

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

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Each year, the first four IRMAA brackets are adjusted for inflation using the Consumer Price Index (CPI-U). Because recent inflation adjustments were relatively modest, the 2026 IRMAA brackets saw only small increases making it easier for retirees to move into higher tiers due to routine income events.

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Once your bracket is determined, the applicable surcharge is added to your Part B premiums for 2026 and your Part D premium. These amounts are finalized annually and applied as fixed monthly adjustments.

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“The percentage by which the average CPI-U for the 12-month period ending August exceeds the prior year’s average.”

Understanding the IRMAA “Cliff”

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A key feature of the system is that IRMAA does not work like a traditional tax bracket.

Once your income exceeds a threshold, the full surcharge for that bracket applies.

Example:

A single retiree earning $137,001 in 2024 pays the same 2026 surcharge as someone earning significantly more within the same tier. This “cliff effect” is why even small increases in income can lead to higher Medicare costs under the 2026 Medicare IRMAA brackets.

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What Income Counts Toward IRMAA in 2026?

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Understanding what counts toward IRMAA is critical for managing your position within the IRMAA brackets.

Included in MAGI:

• Pension income (FERS/CSRS)
  
  
• TSP withdrawals
  
  
• Capital gains and dividends
  
  
• Roth conversions
  
  
• Rental and business income
  
  

Because all of these sources feed into the IRMAA calculation for 2026, even a single financial decision like selling investments or converting to Roth can impact your Medicare premiums two years later, which is why understanding how to reduce IRMAA premiums is critical.

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2026 Medicare Part B and Part D Costs

Because IRMAA applies directly to Medicare Part B and Part D, these are the most important costs to understand when evaluating the IRMAA brackets and overall Medicare expenses.

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The Part B premiums for 2026 start at $202.90 per month but increase significantly based on income under the latest IRMAA brackets, reaching up to $689.90 per month. These adjustments are determined through the IRMAA calculation for 2026, which uses your prior income to assign surcharge tiers.

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Why the increase?

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CMS noted that without regulatory action lowering spending on skin substitutes through the 2026 Physician Fee Schedule, the Part B premium would have been $11/month higher. Rule changes will reduce spending on skin substitutes by 90%, limiting premium growth without affecting patient care.

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2026 Part B IRMAA Brackets

(For Single Filers ≤ $109,000 and Married Filing Jointly ≤ $218,000)

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Also read - how much will medicare part b cost in 2026

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

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2026 Part B IRMAA (Married Filing Separately)

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2026 Part B Immunosuppressive-Only IRMAA Table

(For kidney transplant recipients losing full Medicare after 36 months)

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2026 Medicare Part D IRMAA Surcharges

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Part D IRMAA  Married Filing Separately

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Income Sources That Trigger IRMAA (MAGI Breakdown)

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Planning Ahead

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While these tables reflect the 2026 IRMAA brackets, many retirees also look ahead to IRMAA brackets 2027. Although future thresholds have not yet been officially released, understanding how income flows through the current IRMAA brackets can help you plan ahead and potentially reduce future Medicare costs.

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Why IRMAA Matters for Federal Retirees

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Federal retirees are uniquely exposed to IRMAA because they often 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 (RMDs) 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.

Another key issue is the IRMAA “cliff.” Unlike progressive tax brackets, IRMAA applies the full surcharge as soon as you exceed a threshold even by $1. A modest capital gain, Roth conversion, or one-time withdrawal can move you into a higher tier under the latest IRMAA brackets.

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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 are experiencing “bracket creep” without making any major financial changes.

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This is why proactive planning is critical. Coordinating withdrawals, managing TSP distributions, and monitoring your IRMAA calculation for 2026 can help reduce exposure and avoid unnecessary Medicare costs.

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Also read - opm disability retirement

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How IRMAA Is Paid

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IRMAA is collected differently depending on whether you are already receiving Social Security benefits. For retirees who are drawing Social Security, both the Part B premium and the IRMAA surcharge are automatically deducted from your monthly benefit. This means you may see a lower Social Security payment than expected when IRMAA applies.

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If you have delayed Social Security something many federal retirees do to maximize benefits IRMAA is billed separately by Medicare. You will receive the CMS-500 premium bill, usually on a quarterly basis, and must pay it directly. Failure to pay IRMAA on time can result in delinquency notices, interruptions in coverage, or complications with reinstatement.

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Medicare treats Part B and Part D IRMAA separately. Even if your FEHB or employer plan pays your Part D premium, your IRMAA portion must still be paid directly to Medicare. This surprises many retirees who assume their plan handles everything related to Part D.

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You can pay IRMAA through several methods:

• MyMedicare.gov – the preferred option because it’s fast, secure, and fee-free.
• Bank bill pay – automated from your financial institution.
• Medicare Easy Pay – an automatic monthly withdrawal system.
• Mailed payments – sent to the Medicare Premium Collection Center.

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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 an SSA-44 for a qualifying life-changing event. Monitoring your mail, MyMedicare account, and payment status helps prevent missed payments or confusion when surcharges change at the start of a new calendar year.

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• If receiving Social Security → IRMAA deducted automatically.
• If delaying Social Security → CMS sends a quarterly bill (Form CMS-500).
• Part D IRMAA is paid directly to Medicare, not the Part D plan.

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Payment options:

• MyMedicare.gov (recommended)
• Bank bill pay
• Mail to CMS premium center

Strategies to Reduce or Avoid IRMAA

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1. Spread Out Roth Conversions

Avoid large, single-year MAGI spikes.

2. Balance Income Across Three Buckets

• Taxable
  
  
• Tax-deferred
  
  
• Tax-free (Roth/HSA)
  

3. Maximize Pre-Tax Contributions (while working)

Reduces MAGI now → reduces IRMAA two years later.

4. Manage Capital Gains Timing

Avoid bunching gains into one tax year.

5. Use QCDs for RMDs

Direct charitable gifts reduce taxable income.

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

May reduce IRMAA due to:

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

How Federal Pension Advisors Can Help?

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Planning for Medicare costs is more than just checking a premium table. We specialise in helping federal employees:

• Project future Medicare expenses
  
• Optimise TSP and annuity withdrawals
  
• Lower IRMAA exposure legally and efficiently
  
• Free Pension & Benefits Review
• IRMAA Planning & Tax Strategy
• Medicare Education for Retirees

Take control of your Medicare premiums before they control your retirement.

Ready to protect your retirement from IRMAA surprises?

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Schedule your free review today at Federal Pension Advisors and get clarity on your Medicare future.

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What You Can Do Now

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Medicare will finalise the 2026 IRMAA brackets later this year after the COLA release. Meanwhile:

• Review your 2024 tax return and project your MAGI for 2026.
  
  
• Estimate whether you’ll cross a threshold and consider adjusting withdrawal timing or conversions.
  
  
• Consult your federal benefits advisor to ensure your income strategy aligns with your Medicare/retirement goals.
  
  

Taking a few minutes now to map your income plan can avoid a costly IRMAA surprise later.

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Conclusion

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IRMAA can significantly increase Medicare costs, but it’s not random it’s predictable and manageable. By understanding the finalized 2026 brackets and managing your MAGI strategically, you can stay in control of your healthcare expenses.

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FAQs

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1. What are the IRMAA income brackets for 2026?

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

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

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

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3. Who has to pay IRMAA in 2026?

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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.

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4. What is IRMAA based on?

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

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Disclaimer

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.