Medicare is not the same price for everyone. In 2026, higher-income beneficiaries can pay more for Medicare Part B and Part D because of IRMAA, the Income-Related Monthly Adjustment Amount, and the determination generally uses 2024 modified adjusted gross income rather than current-year income.
That creates a planning issue for retirees because a one-time income event can lead to higher Medicare premiums later. A Roth conversion, large IRA withdrawal, realized capital gain, or other spike in income can push someone into a higher IRMAA bracket even if that income does not repeat.
This article explains how IRMAA works, what the 2026 brackets look like, what types of income can trigger a surcharge, and which planning moves may help reduce avoidable premium increases.
What is IRMAA?
IRMAA stands for Income-Related Monthly Adjustment Amount. It is an additional charge applied to Medicare Part B and Part D premiums for beneficiaries whose income exceeds certain thresholds.
Social Security uses tax return information to determine whether the surcharge applies. For 2026, that determination generally looks back two years to 2024 income.
This matters because retirees often focus on taxes without realizing that Medicare premiums can also change based on reported income. IRMAA is not a separate plan choice. It is an income-based premium adjustment.
Which parts of Medicare does IRMAA affect?
IRMAA affects:
- Medicare Part B
- Medicare Part D
For Part B, the surcharge is added to the standard monthly premium. For Part D, the surcharge is added on top of the premium charged by the prescription drug plan.
In 2026, the standard Medicare Part B premium is $202.90 per month before any IRMAA surcharge is added.
How IRMAA is Calculated
The key input is modified adjusted gross income, or MAGI. For Medicare IRMAA purposes, MAGI generally includes adjusted gross income plus tax-exempt interest, including municipal bond interest.
That point is important because some retirees assume tax-exempt income does not matter for Medicare premiums. For IRMAA, municipal bond interest can still count in the income calculation.
The other important rule is timing. Medicare generally uses income from two years earlier, which means a 2024 income spike can affect 2026 premiums.
2026 IRMAA brackets
For 2026, the first IRMAA threshold begins above $109,000 for individual filers and above $218,000 for married couples filing jointly. Beneficiaries below those thresholds generally do not pay IRMAA.
The published 2026 surcharge ranges are:
- Part B IRMAA: $81.20 to $487.00 per month
- Part D IRMAA: $14.50 to $91.00 per month
At the top bracket, the total Medicare Part B premium reaches $689.90 per month in 2026, combining the standard premium and the highest surcharge.
Individual filers
- $109,000 or less: No IRMAA surcharge.
- $109,001 to $137,000: Part B +$81.20; Part D +$14.50
- $137,001 to $171,000: Part B +$202.90; Part D +$37.50
- $171,001 to $205,000: Part B +$324.60; Part D +$60.40
- $205,001 to $499,999: Part B +$446.30; Part D +$83.30
- $500,000 or more: Part B +$487.00; Part D +$91.00
Married filing jointly
$218,000 or less: No IRMAA surcharge.
- $218,001 to $274,000: Part B +$81.20; Part D +$14.50
- $274,001 to $342,000: Part B +$202.90; Part D +$37.50
- $342,001 to $410,000: Part B +$324.60; Part D +$60.40
- $410,001 to $749,999: Part B +$446.30; Part D +$83.30
- $750,000 or more: Part B +$487.00; Part D +$91.00
Why IRMAA catches retirees off guard
IRMAA often appears after a year with unusually high income. Because Medicare uses a two-year lookback, the surcharge may show up well after the event that caused it.
That means a retiree can make a one-time planning move in 2024 and not feel the Medicare effect until 2026. The delay makes IRMAA easy to miss during routine tax and withdrawal planning.
Another issue is that crossing a threshold can trigger a full higher bracket. Even if income rises by a relatively small amount above a cutoff, the surcharge can jump to the next tier.
Common income events that can trigger IRMAA
Several routine planning decisions can increase MAGI enough to trigger or worsen IRMAA:
- Large withdrawals from traditional IRAs
- Roth conversions
- Realized capital gains from investment sales
- Pension or annuity income
- Tax-exempt municipal bond interest
None of these are inherently bad moves. The issue is that each can affect Medicare premiums as well as taxes.
Roth conversions and IRMAA
Roth conversions are a common planning tool because they can reduce future required minimum distributions and create tax-free withdrawal flexibility later. But the converted amount is generally included in taxable income for the year of conversion, which can increase MAGI and trigger IRMAA.
That does not mean retirees should avoid Roth conversions. It means the size and timing of conversions should be modeled carefully, especially for households near an IRMAA threshold.
For some retirees, a series of smaller conversions across multiple years may be easier to manage than one large conversion in a single year. That approach can help control both tax brackets and Medicare premium consequences.
Capital gains, sales, and one-time income spikes
Selling appreciated investments or property can also create an IRMAA issue because realized gains increase income for tax purposes. A large gain recognized in one year can move a household into a higher premium bracket later.
This can matter in several situations:
- Selling concentrated stock positions
- Selling a business interest
- Selling investment real estate
- Rebalancing a taxable portfolio with large gains
When a gain is unavoidable, timing may still matter. Spreading transactions across years or pairing gains with losses may help reduce the impact in some cases.
How Retirees May Reduce IRMAA Exposure
Retirees cannot opt out of IRMAA if income exceeds the thresholds, but they may be able to manage the income that drives the surcharge. The planning goal is not always to avoid IRMAA completely. It is to avoid unnecessary surprises and make informed tradeoffs.
Manage Withdrawals Across Account Types
Households that can draw from taxable accounts, traditional IRAs, cash, and Roth accounts have more flexibility in controlling MAGI. Qualified Roth withdrawals generally do not increase taxable income, which can be helpful in years when a retiree wants to stay below a threshold.
Spread Income Over Multiple Years
A one-year income spike is often what triggers the surcharge. In some cases, staging conversions, gains, or distributions over several years can reduce the risk of crossing into a higher bracket.
Pay Attention To Tax-Exempt Interest
Municipal bond interest may be exempt from federal income tax, but it still matters for IRMAA MAGI. Retirees with large muni holdings should include that income when projecting Medicare premium exposure.
Consider Qualified Charitable Distributions
Qualified Charitable Distributions can reduce taxable IRA income because eligible amounts sent directly to charity are excluded from taxable income. That may also reduce MAGI and help manage IRMAA exposure.
Coordinate Social Security Timing
Social Security benefits can affect overall income calculations, so claiming decisions may influence how much room remains for Roth conversions or other taxable events. That does not create one universal answer, but it does make coordination important.
Can you appeal IRMAA?
Yes, in some cases. Social Security says beneficiaries can ask to lower their IRMAA after a life-changing event that reduced household income.
Examples include:
- Retirement
- Death of a spouse
- Divorce or annulment
- Work stoppage or a significant loss of income
The request is generally made using Form SSA-44. Social Security directs beneficiaries whose income has gone down because of a qualifying life-changing event to use that form to request a new determination.
Example: How A Retiree Can Accidentally Trigger IRMAA
Suppose a married couple usually has MAGI below $218,000, but in 2024 they complete a large Roth conversion that pushes their income above that threshold. In 2026, Medicare may apply IRMAA because the determination uses 2024 income.
The conversion could still be worthwhile, but the higher premium would be part of the total cost of that strategy. A smaller, staged conversion plan might have produced a different result.
That is the real point of IRMAA planning. It is not just about avoiding a surcharge. It is about understanding the full cost of a retirement-income decision before making it.
Frequently Asked Questions
Does everyone on Medicare pay IRMAA?
No. IRMAA applies only to beneficiaries whose income exceeds the relevant thresholds.
Is IRMAA based on current-year income?
Generally no. For 2026, Medicare typically uses 2024 income because of the two-year lookback rule.
Does municipal bond interest count toward IRMAA?
Yes. Tax-exempt municipal bond interest is generally included in Medicare MAGI calculations.
Can IRMAA go away in a future year?
Yes. If income later falls below the thresholds, the surcharge can decline or disappear in a later determination year.
Can a retiree challenge an IRMAA notice?
Yes. Social Security says a beneficiary may request a lower IRMAA after a qualifying life-changing event by filing Form SSA-44.
Final thoughts
IRMAA is easy to overlook because it sits at the intersection of tax planning, retirement withdrawals, and Medicare costs. But once income crosses the thresholds, the surcharge becomes a real cash-flow issue, especially for married couples where both spouses may be affected.
The good news is that IRMAA is not random. It follows published thresholds and known income rules, which means retirees can plan around it if they look far enough ahead. Reviewing withdrawals, Roth conversions, gains, charitable distributions, and claiming decisions in one coordinated plan can make a meaningful difference.
A surcharge notice is a bad time to discover that taxes, Medicare premiums, withdrawals, and Roth conversions were never coordinated. Sitting down with a financial advisor who specializes in retirement income planning can help you evaluate IRMAA alongside tax strategy, Social Security timing, portfolio withdrawals, and long-term healthcare costs before expensive surprises show up. Medicare premiums for higher-income retirees are directly affected by prior-year income, which is exactly why these decisions are better made proactively than reactively
