Ins and Outs of IRMAA
IRMAA stands for Income-Related Monthly Adjustment Amount and is an increase in Medicare premium based on income. IRMAA matters because if you are not careful you may unexpectedly add a large expense to your insurance bill.
How is IRMAA Calculated
IRMAA is calculated based on your MAGI (Modified Adjusted Gross Income) from your tax return two years ago. This means that you not only need to look out for earned income, but also IRA distributions, Capital gains, bond interest, passive income, roth conversions ETC. And remember it wont raise your premiums this year or next, but two years from your tax return your premiums could spike if you are not careful.
What is the Income Limit?
MAGI | Part B Monthly | Part D Monthly |
≤ $103,000 | $174.70 | $0 |
$103k–$129k | ~$244 | ~$12 |
$129k–$161k | ~$349 | ~$32 |
$161k–$193k | ~$454 | ~$52 |
$193k–$500k | ~$560 | ~$72 |
> $500k | ~$594 | ~$81 |
Remember this is a cliff schedule so if you go one dollar over the said MAGI then you pay the full next tier of pemium.
Exceptions:
You can file an appeal to the income increase if you had a qualifying event including: Retirment, decrease in work hourse, death of a spouse, divorce etc.
In Short:
IRMAA is an increase in Medicare premium based on two years ago MAGI. If you are not careful what seems like a simple decision could become very expensive very quickly.
Ins and Outs of IRMAA
IRMAA, short for Income-Related Monthly Adjustment Amount, is an additional charge added to your Medicare Part B and Part D premiums when your income exceeds certain thresholds. IRMAA matters because, without careful planning, a single financial decision can unexpectedly increase your Medicare costs by hundreds—or even thousands—of dollars per year.
How Is IRMAA Calculated?
IRMAA is based on your Modified Adjusted Gross Income (MAGI) from your federal tax return two years prior.
MAGI includes more than just earned income. It also captures many other common sources of income, such as:
- Traditional IRA and 401(k) distributions
- Capital gains from the sale of investments
- Bond and interest income (including tax-exempt interest)
- Passive or rental income
- Roth conversions
- Business income
Because of the two-year lookback, income decisions made today may not impact your Medicare premiums until years later. For example, a large income event in 2023 could result in higher Medicare premiums in 2025. This delay is one of the main reasons IRMAA often catches retirees by surprise.
What Are the Income Limits?
Below is an example of how income levels can affect Medicare premiums for individuals for 2026.
MAGI (Single Files) | Part B Monthly Surcharge | Part B Monthly Total |
≤ $109,000 | 0 | $202.9 |
$109,000-$137,000 | $81 | $284.1 |
$137,000-$171,000 | $202.9 | $405.8 |
$171,000-$205,000 | $324.6 | $527.5 |
$205,000-$500,000 | $446.3 | $649.2 |
Greater than or Equal $500,000 | $487 | $689.9 |
MAGI (Joint Filers) | Part B Monthly Surcharge (Each Spouse pays Surcharge) | Part B Monthly Total (Each Spouse Pays This) |
≤ $218,000 | 0 | $202.9 |
$218,000 -$274,000 | $81 | $284.1 |
$274,000-$342,000 | $202.9 | $405.8 |
$342,000-$410,000 | $324.6 | $527.5 |
$410,000-$750,000 | $446.3 | $649.2 |
Greater than or Equal $750,000 | $487 | $689.9 |
Important: IRMAA follows a cliff structure, not a gradual phase-in. If your income exceeds a threshold by even one dollar, you pay the full higher premium for the entire year.
Why IRMAA Can Be Easy to Trigger
Many people assume IRMAA only affects high earners, but it commonly impacts middle- and upper-middle-income retirees. Common situations that can unexpectedly trigger IRMAA include:
- Large Roth conversions
- Required Minimum Distributions (RMDs)
- Selling a business or investment property
- Taking significant capital gains in a single year
- Receiving severance or bonus income
- Holding investments that generate tax-exempt interest
Even income that is not taxable can still count toward MAGI for IRMAA purposes.
Exceptions: Appealing an IRMAA Increase
You may be able to appeal an IRMAA surcharge if your income has decreased due to a qualifying life-changing event. Examples include:
- Retirement or work stoppage
- Reduction in work hours
- Death of a spouse
- Divorce or annulment
- Loss of income-producing property
If approved, the appeal can reduce or eliminate the IRMAA surcharge for the affected year. However, income increases due to voluntary financial decisions—such as Roth conversions or investment sales—generally do not qualify for an appeal.
In Short
IRMAA is an income-based increase to Medicare premiums determined by your MAGI from two years ago. Because it operates on a cliff system and includes many sources of income beyond wages, even seemingly simple financial decisions can lead to significantly higher Medicare costs if not planned carefully.
Understanding IRMAA ahead of time allows you to make informed tax and income decisions—and avoid unpleasant surprises down the road.
Bibliography:
LeValley, D. (2025, December 10). What is the IRMAA (income-related monthly adjustment amount)?. Kiplinger. https://www.kiplinger.com/retirement/medicare/what-is-the-irmaa?utm_source=chatgpt.com
Request to lower an income-related monthly adjustment amount (IRMAA). Social Security. (n.d.). https://www.ssa.gov/medicare/lower-irmaa?utm_source=chatgpt.com
2026 Medicare Parts A & B premiums and deductibles. CMS.gov. (n.d.). https://www.cms.gov/newsroom/fact-sheets/2026-medicare-parts-b-premiums-deductibles
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