Medicare IRMAA Calculator 2026: Estimate Your Income Surcharge
Figures last verified against official sources in July 2026.
Quick Answer
In 2026, Medicare IRMAA surcharges begin when your 2-year prior MAGI exceeds $106,000 for single filers or $212,000 for married joint filers. Tier 1 adds $81.20/month to Part B and $13.70/month to Part D. The highest earners above $500,000 (single) or $750,000 (joint) pay up to $443.90/month extra on Part B.
We noticed that many seniors receive an unexpected IRMAA surcharge notice from Social Security because their income two years ago was elevated by a job salary, property sale, or one-time retirement withdrawal. We built this free tool because seniors deserve a clear, instant plain English calculator to check their exact IRMAA tier without insurance broker calls, email signups, or selling personal data.
- Retirees with income above $100,000 who want to check if they owe an IRMAA surcharge on their 2026 Medicare premiums.
- Seniors planning large 401(k) withdrawals, Roth IRA conversions, or property sales who want to model the IRMAA impact beforehand.
- People who received an initial IRMAA determination letter and want to verify if they qualify for an appeal using SSA Form SSA-44.
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How to Use This Tool — Step by Step
- Step 1 — Locate your 2024 tax return (Form 1040). Find Line 11 for your Adjusted Gross Income (AGI) and Line 2a for tax-exempt interest income.
- Step 2 — Calculate your Modified Adjusted Gross Income (MAGI). Add Line 11 (AGI) and Line 2a (tax-exempt interest) together to find your Medicare MAGI.
- Step 3 — Select your tax filing status in the calculator. Choose Single, Married Filing Jointly, or Married Filing Separately.
- Step 4 — Click "Calculate My IRMAA Surcharge." View your exact Part B and Part D surcharge tiers and total combined monthly payment for 2026.
💡 Pro Tip — Lower Your IRMAA Surcharge with Form SSA-44
If your 2024 income was high because you were still working, but you retired or had a qualifying life-changing event in 2025 or 2026, you do not have to pay the higher IRMAA rate! File Form SSA-44 with Social Security to request an immediate reduction. Use our IRMAA appeal letter generator to create your custom appeal packet.
Real-Life Examples — How IRMAA Calculations Work in Practice
Henry is single and took an extra IRA distribution in 2024, resulting in a 2024 MAGI of $125,000.
| Category | Value |
|---|---|
| 2024 MAGI (Single) | $125,000 |
| IRMAA Tier | Tier 1 ($106,001 – $133,000) |
| Part B Monthly Surcharge | +$81.20 |
| Part D Monthly Surcharge | +$13.70 |
Henry pays $284.10 per month for Part B ($202.90 base + $81.20 IRMAA) plus an extra $13.70/month on his Part D plan.
Henry noted that because his 2025 income returned to normal ($85,000), his IRMAA surcharge will automatically drop back to $0 for the 2027 plan year.
David retired in December 2024. Their joint 2024 MAGI was $250,000 while working, but their current 2026 retirement income is $140,000.
| Item | Original 2026 Notice | After SSA-44 Appeal |
|---|---|---|
| IRMAA Tier Based on 2024 Tax Return | Tier 1 ($212k–$266k) | Base Rate (Income < $212k) |
| Combined Monthly Part B Cost for Both | $568.20 / month | $405.80 / month |
By appealing with Form SSA-44, David and Susan saved $162.40 per month ($1,948.80 per year) in Medicare surcharges.
They submitted Form SSA-44 with proof of David's retirement, successfully eliminating their IRMAA tier.
These are representative examples based on official 2026 CMS rates. Individual surcharges vary based on IRS tax records. Always verify your official determination with the Social Security Administration.
Common Mistakes and How to Avoid Them
Assuming Municipal Bond Interest Is Exempt from Medicare IRMAA
Many seniors believe tax-exempt municipal bond interest does not count toward Medicare calculations. In reality, Social Security adds tax-exempt interest (Line 2a of Form 1040) directly back into your AGI to calculate your Medicare MAGI.
The fix is to include Line 2a tax-exempt interest when estimating your MAGI. Read official rules at Social Security Medicare premiums guide.
Not Realizing Married Filing Separately Has Extremely Low Thresholds
Seniors who file Married Filing Separately face a harsh Tier 1 threshold starting at just $106,000 MAGI, pushing them rapidly into high IRMAA brackets.
The fix is to consult a tax professional to evaluate whether filing jointly provides lower overall healthcare and tax costs. Learn more at irs.gov tax filing guides.
Failing to Appeal When Your Income Drops Due to a Life-Changing Event
Social Security automatically applies your 2-year-old tax return. If you retired, divorced, or lost income since then, they will overcharge you unless you submit an appeal.
The fix is to file Form SSA-44 immediately. Use our IRMAA appeal wizard to verify if your situation qualifies.
Official Government Sources Used in This Tool
| Source Name | What We Used It For | Direct Link |
|---|---|---|
| CMS 2026 Medicare Parts A & B Premiums & IRMAA Brackets | Official 2026 IRMAA income tiers and Part B surcharge rates | CMS 2026 Premiums Fact Sheet |
| Social Security Administration — Medicare Premiums & Appeals | Official SSA guidelines for IRMAA determination and appeal processes | SSA Official Medicare Premiums |
| SSA Form SSA-44 (Life-Changing Event Appeal) | Official SSA appeal form for requesting IRMAA reduction | SSA-44 Appeal Form PDF |
Seniors Audit is an independent educational platform. We are not affiliated with, endorsed by, or connected to any government agency, insurance company, or financial services firm. All calculations use the official formulas and current figures published by the agencies listed above. We do not receive payment for referrals, leads, or any action taken by visitors to this site.
Frequently Asked Questions
What is an IRMAA calculator and how does it work?
An IRMAA calculator determines whether your income triggers an Income-Related Monthly Adjustment Amount (IRMAA) surcharge on your Medicare Part B and Part D premiums. It takes your Modified Adjusted Gross Income (MAGI) from two years prior (2024 tax return for 2026 premiums) and your tax filing status, compares your income to official CMS brackets, and displays your exact monthly surcharge.
How do I use this Medicare IRMAA calculator?
To use this Medicare IRMAA calculator, select your tax filing status (Single, Married Filing Jointly, or Married Filing Separately) and enter your MAGI from two years ago (Form 1040 Line 11 plus tax-exempt interest). You can also toggle multi-year mode to compare your current surcharge against projected future years side-by-side.
How do I calculate IRMAA for my Medicare premiums?
To calculate IRMAA, locate your Adjusted Gross Income on Line 11 of your IRS Form 1040 from two years prior and add any tax-exempt interest from Line 2a to calculate your MAGI. Compare this figure to the official CMS IRMAA tier table for your filing status. If your single income exceeds $106,000 or joint income exceeds $212,000 in 2026, add the corresponding monthly surcharge to your standard Part B premium.
What is the difference between IRMAA calculation 2025 and 2026 rules?
The core mechanics of the IRMAA calculation for 2025 and 2026 remain identical, but CMS adjusts the income threshold brackets and standard premium amounts annually for inflation. For 2026, the standard Part B premium is $202.90, and the initial IRMAA threshold begins at $106,000 for single filers and $212,000 for joint filers.
How does the Medicare Part B IRMAA calculator compute Part B surcharges?
The Medicare Part B IRMAA calculator matches your MAGI to one of five CMS income tiers above the standard rate. In 2026, Tier 1 adds $81.20/month, Tier 2 adds $202.90/month, Tier 3 adds $324.60/month, Tier 4 adds $446.30/month, and Tier 5 adds $486.90/month on top of the base $202.90 Part B premium.
What tax return year determines my 2026 IRMAA surcharge?
Social Security uses your tax return from two years prior to determine your current benefit year's IRMAA. For your 2026 Medicare premiums, Social Security uses your 2024 tax return filed with the IRS in 2025. If you experienced a life-changing event in 2025 or 2026 that lowered your income, you can appeal using SSA Form SSA-44.
How can I appeal or lower my IRMAA surcharge using Form SSA-44?
If your income dropped due to a qualifying life-changing event — such as retirement, work reduction, marriage, divorce, or loss of income-producing property — you can file Form SSA-44 (Medicare Income-Related Monthly Adjustment Amount - Life-Changing Event) with Social Security along with proof of your event and new estimated income to request a lower bracket.
Does IRMAA apply to Medicare Advantage (Part C) plans?
Yes. If you choose a Medicare Advantage plan, you must still pay your Part B premium (including any Part B IRMAA surcharge). Additionally, if your Medicare Advantage plan includes Part D prescription drug coverage, you pay the Part D IRMAA surcharge directly to Medicare or your plan provider.
Important Terminologies & Abbreviations Explained
A higher monthly surcharge added to Medicare Part B and Part D premiums for individuals with higher income.
Your IRS Adjusted Gross Income (AGI) plus tax-exempt interest income. Social Security uses this figure to determine your IRMAA tier.
Medicare medical insurance covering doctor visits and outpatient care. Standard 2026 premium is $202.90/month.
Medicare prescription drug coverage. High earners pay an extra Part D IRMAA surcharge on top of their plan premium.
The official Social Security form used to appeal an IRMAA surcharge after experiencing a qualifying life-changing event.
The federal government agency that establishes annual IRMAA income brackets and Medicare premium rates.
Other Free Tools You May Find Useful
For a complete guide to how Medicare premiums and income surcharges work, visit our Medicare education hub — including our article on Medicare costs, penalties, and IRMAA brackets explained in plain English. If you need to calculate your complete monthly bill, use our Medicare premium calculator. If your income dropped due to retirement or a life event, our IRMAA appeal letter generator creates your appeal in minutes. You can also verify your exact MAGI figure with our MAGI for Medicare calculator.
About This Educational Estimate: This tool is for educational purposes only. Seniors Audit uses the official formulas published by Centers for Medicare & Medicaid Services (CMS), but results are estimates based on the information you entered. Rules, rates, and eligibility thresholds change annually and vary by individual circumstance.
Always verify your specific result directly with Centers for Medicare & Medicaid Services (CMS) at 1-800-633-4227 or at www.medicare.gov before making enrollment, coverage, or financial decisions.
If you have Medicare questions, a free SHIP counselor in your state can review your specific situation at no cost — find yours at shiphelp.org.
Seniors Audit is independent and not affiliated with any government agency or insurance company. We are not affiliated with, endorsed by, or connected to any government agency, insurance company, or financial services firm. All calculations use the official formulas and current figures published by the agencies listed above. We do not receive payment for referrals, leads, or any action taken by visitors to this site. Last reviewed: July 2026.