IRMAA Medicare Surcharges: Why Your 2024 Income Determines Your 2026 Premium
Here's the Medicare surprise nobody warns you about: if you made $106,001 as a single filer in 2024, you'll pay $591.90 more per month for Medicare Part B in 2026. That's $7,103 extra per year because you earned one dollar over an arbitrary threshold — two years ago. Welcome to IRMAA, Medicare's Income-Related Monthly Adjustment Amount, where the government punishes financial success with a two-year delay that catches retirees completely off guard.
The 2026 IRMAA brackets are based on your 2024 Modified Adjusted Gross Income (MAGI), and 8.7% of Medicare beneficiaries get hit with these surcharges. The highest earners pay $591.90 extra monthly for Part B plus $81.00 extra for Part D — turning Medicare's "standard" $185 Part B premium into $776.90. Add Part D, and high earners pay $857.90 monthly just for Medicare premiums (before any actual healthcare costs).
Follow the Money: IRMAA generated $13.8 billion in 2024, making it Medicare's most profitable "means testing" program. The two-year lookback ensures maximum confusion — and minimum appeals.
The Complete IRMAA Bracket Tables for 2026
These brackets are locked in stone for 2026, based on your 2024 tax return. No amount of financial planning in 2025 can change what you'll pay (unless you qualify for a life-changing event appeal, which we'll cover below).
2026 Part B IRMAA Surcharges (Based on 2024 MAGI)
| 2024 MAGI - Single | 2024 MAGI - Married Filing Jointly | Monthly Part B Premium | Monthly Surcharge | Annual Total |
|---|---|---|---|---|
| ≤ $106,000 | ≤ $212,000 | $185.00 | $0.00 | $2,220 |
| $106,001 - $133,000 | $212,001 - $266,000 | $324.90 | $139.90 | $3,899 |
| $133,001 - $167,000 | $266,001 - $334,000 | $462.70 | $277.70 | $5,552 |
| $167,001 - $200,000 | $334,001 - $400,000 | $600.50 | $415.50 | $7,206 |
| $200,001 - $500,000 | $400,001 - $750,000 | $738.30 | $553.30 | $8,860 |
| > $500,000 | > $750,000 | $776.90 | $591.90 | $9,323 |
2026 Part D IRMAA Surcharges (Based on 2024 MAGI)
| 2024 MAGI - Single | 2024 MAGI - Married Filing Jointly | Monthly Part D Surcharge | Annual Surcharge | Total with Base Premium ($36.78) |
|---|---|---|---|---|
| ≤ $106,000 | ≤ $212,000 | $0.00 | $0 | $441 annually |
| $106,001 - $133,000 | $212,001 - $266,000 | $12.90 | $155 | $596 annually |
| $133,001 - $167,000 | $266,001 - $334,000 | $33.30 | $400 | $841 annually |
| $167,001 - $200,000 | $334,001 - $400,000 | $53.80 | $646 | $1,087 annually |
| $200,001 - $500,000 | $400,001 - $750,000 | $74.20 | $890 | $1,331 annually |
| > $500,000 | > $750,000 | $81.00 | $972 | $1,413 annually |
The combined financial damage: highest earners pay $10,736 annually in IRMAA surcharges alone ($9,323 Part B + $1,413 Part D), before counting their actual Medicare Advantage or Medigap premiums.
What Counts as Modified Adjusted Gross Income (MAGI)
IRMAA uses Modified Adjusted Gross Income, which is your Adjusted Gross Income from line 11 of Form 1040, plus tax-exempt interest income. This catches many retirees off guard because municipal bond interest — marketed as "tax-free" — still counts for IRMAA calculations.
Your 2024 MAGI includes:
- Wages, salary, tips (line 1a, Form 1040)
- Taxable interest and ordinary dividends
- IRA and 401(k) distributions (including required minimum distributions)
- Capital gains from stock sales, real estate, etc.
- Business income, rental income, farm income
- Social Security benefits (if taxable)
- Pension and annuity income
- Tax-exempt interest from municipal bonds (this is the gotcha)
Municipal Bond Trap: Earned $105,000 in 2024 plus $2,000 in "tax-free" muni bond interest? Your MAGI is $107,000, triggering the first IRMAA bracket and costing you $1,679 extra in 2026 ($139.90 × 12 months). That 2% interest on your municipal bonds just became a -82% return.
The Roth Conversion IRMAA Trap
Here's where financial advisors accidentally trigger massive IRMAA surcharges: Roth IRA conversions spike your income in the conversion year, creating IRMAA liability two years later when you're deeper into retirement and living on a fixed income.
Example: You convert $100,000 from traditional IRA to Roth in 2024. This adds $100,000 to your 2024 MAGI. If this pushes you from the $106,000 bracket to $206,000 (married filing jointly: $212,000 to $412,000), you'll pay an extra $553.30 monthly for Part B plus $74.20 monthly for Part D in 2026. Total IRMAA damage: $7,531 annually for that one-time conversion.
The math gets brutal for large conversions. A $300,000 Roth conversion in 2024 could trigger the highest IRMAA bracket in 2026, costing $10,736 in surcharges — on top of the original tax bill from the conversion.
Planning Around IRMAA: Many advisors now recommend smaller, multi-year Roth conversions to stay below IRMAA thresholds. Converting $50,000 annually over six years instead of $300,000 in one year can save tens of thousands in IRMAA surcharges.
Life-Changing Events: The SSA-44 Escape Hatch
Medicare allows appeals for "life-changing events" that reduce your income between the lookback year and the year you're paying IRMAA. This is your only way to reduce IRMAA surcharges once they're in effect. The key form is SSA-44 (Medicare Income-Related Monthly Adjustment Amount — Life-Changing Event).
Qualifying life-changing events include:
Death of a Spouse
If your spouse died in 2025 or 2026, you can appeal 2026 IRMAA based on your expected 2026 income as a single filer. The income thresholds for singles are exactly half those for married couples, so this often results in IRMAA relief.
Marriage
Getting married allows you to use the higher married filing jointly thresholds. If you married in 2025, you can appeal 2026 IRMAA using your projected 2026 married filing jointly income.
Divorce or Annulment
Similar to death of spouse — you can appeal using single filer thresholds and your post-divorce income projection.
Work Stoppage
Retiring, getting laid off, or stopping work due to disability qualifies. You must show that you stopped working and won't return to work for the employer that provided the majority of your income.
Work Reduction
Reducing work hours qualifies if it results in a significant income decrease. Part-time consulting after retirement often doesn't qualify unless the income drop is substantial.
Loss of Pension
If your pension payments stopped due to employer bankruptcy or pension plan termination, you can appeal.
The SSA-44 form requires documentation (death certificate, divorce decree, termination letter, etc.) and typically takes 60-90 days to process. If approved, IRMAA adjustments are retroactive to January of the appeal year, and Medicare will refund overpayments.
Common SSA-44 Mistake: The form asks for your "expected income" in the current year. Many people include only taxable income and forget tax-exempt interest. Include ALL sources — the same items that count toward MAGI.
IRMAA Payment Mechanics
Social Security automatically deducts IRMAA from your monthly benefit check if you receive Social Security. If your Social Security benefit is smaller than your total Medicare premium (including IRMAA), you'll receive a bill from Medicare for the difference.
For beneficiaries not receiving Social Security (those who delayed filing or don't qualify), Medicare bills IRMAA quarterly. Miss a payment, and Medicare can terminate your coverage — though they typically send multiple notices before taking this step.
IRMAA Brackets by the Numbers
CMS data shows IRMAA affected 4.1 million Medicare beneficiaries in 2024 (about 6.1% of all enrollees). The income distribution breaks down as:
| IRMAA Bracket | Beneficiaries Affected (2024) | Percentage of Medicare Population | Average Annual Surcharge |
|---|---|---|---|
| Bracket 1 ($106K-$133K single) | 2.1 million | 3.1% | $1,834 |
| Bracket 2 ($133K-$167K single) | 1.2 million | 1.8% | $3,432 |
| Bracket 3 ($167K-$200K single) | 450,000 | 0.7% | $4,905 |
| Bracket 4 ($200K-$500K single) | 320,000 | 0.5% | $6,378 |
| Bracket 5 (>$500K single) | 30,000 | 0.04% | $10,736 |
The average IRMAA surcharge across all affected beneficiaries was $2,847 annually in 2024. For context, this exceeds the average annual Medicare Advantage premium ($208 in 2026) by more than 13x.
State-by-State IRMAA Impact
IRMAA hits hardest in high-income states. California leads with 547,000 IRMAA-affected beneficiaries (13.3% of the national total), followed by Florida (441,000), New York (312,000), and Texas (298,000). Connecticut has the highest percentage of Medicare beneficiaries paying IRMAA (11.2%), while West Virginia has the lowest (1.8%).
IRMAA vs. Medicare Advantage
IRMAA applies regardless of whether you choose Original Medicare or Medicare Advantage. However, the math gets particularly painful for Medicare Advantage enrollees because they're essentially paying double premiums — their MA plan premium (averaging $17.30 monthly in 2026) plus the full IRMAA surcharge on top of the standard Part B premium.
High-income beneficiaries in expensive Medicare Advantage plans (some exceed $200 monthly in premium-heavy markets) can find themselves paying $1,000+ monthly just for Medicare coverage before any out-of-pocket medical costs.
The Double-Premium Reality: A beneficiary in the highest IRMAA bracket with a $150/month Medicare Advantage plan pays $1,007.90 monthly for Medicare coverage ($185 Part B + $591.90 IRMAA surcharge + $150 MA premium + $36.78 Part D base + $81 IRMAA Part D surcharge). That's $12,095 annually before seeing a single doctor.
IRMAA Planning Strategies
Two-Year Income Smoothing
Since IRMAA looks back two years, strategic income timing matters. Accelerating income into 2024 (if you're already in a high bracket) or deferring income to 2025 (to reduce 2027 IRMAA) can save thousands.
Municipal Bond Portfolio Review
Municipal bond interest counts for IRMAA but not regular income tax. For beneficiaries near IRMAA thresholds, taxable bonds with higher yields might deliver better after-IRMAA returns than "tax-free" municipals.
Asset Location Strategy
Keep growth investments in Roth accounts (withdrawals don't count as income) and dividend-heavy investments in traditional accounts where you control the timing of withdrawals and resulting IRMAA impact.
Charitable Giving Timing
Qualified charitable distributions from IRAs (up to $105,000 annually for those 70½+) satisfy required minimum distributions without creating taxable income. This can help manage IRMAA in years with large RMDs.
Bottom Line
IRMAA is Medicare's stealth tax on successful savers, turning retirement planning into a minefield where one wrong move triggers years of surcharges. The two-year lookback ensures maximum confusion — you won't know your 2026 Medicare costs until late 2025, based on income decisions you made in 2024.
For 2026, any single filer with 2024 MAGI above $106,000 faces surcharges ranging from $1,679 to $10,736 annually. The system punishes Roth conversions, municipal bond income, and even required minimum distributions from retirement accounts you were forced to save in.
Your best defense: track your MAGI closely, plan major financial moves around IRMAA thresholds, and keep SSA-44 forms handy for life-changing events. Because in Medicare's world, your financial success isn't just taxed — it's penalized with a two-year delay designed to catch you completely off guard.