Most people know that Medicare Part B has a standard monthly premium. What they don't know is that roughly 7% of Medicare beneficiaries pay significantly more -- sometimes three times the standard rate -- because of a surcharge called IRMAA. If you're planning retirement income, IRMAA is one of the most important and most overlooked variables in the equation.
What IRMAA is
IRMAA stands for Income Related Monthly Adjustment Amount. It's an additional premium added to your Medicare Part B and Part D costs when your income exceeds certain thresholds. The Social Security Administration determines your IRMAA bracket using your Modified Adjusted Gross Income (MAGI) from two years prior.
In 2026, your IRMAA is based on your 2024 tax return. This two-year lookback is why IRMAA catches many new retirees off guard: your income in your final working year (often high with salary, bonuses, and retirement distributions) determines your Medicare premium two years later, when you may be living on a much lower retirement income.
How the brackets work
There are six IRMAA tiers. The standard Part B premium in 2026 is $202.90/month. Single filers with 2024 MAGI above $109,000 (and married filing jointly above $218,000) pay additional surcharges that can more than triple the standard premium. The highest tier applies to incomes above $500,000 for single filers and $750,000 for joint filers.
Part D works the same way. Whatever Part D plan you're enrolled in, SSA adds a separate IRMAA surcharge based on the same brackets. The Part D surcharge ranges from roughly $13 to $81 per month depending on your tier. Combined with Part B surcharges, high-income retirees can pay $500 or more per month above the standard Medicare cost.
Use the IRMAA calculator on this site to find your exact 2026 bracket and monthly cost based on your MAGI.
The cliff effect
IRMAA brackets are fixed thresholds, not graduated rates. Being $1 over a threshold moves your entire premium to the next tier. Going from $105,999 to $106,001 in MAGI costs you hundreds of dollars per year in extra premiums -- for every additional dollar over the threshold.
This creates a real planning opportunity. If your projected MAGI is close to a threshold, managing income sources can keep you in a lower bracket. Strategies include:
- Timing Roth conversions to stay under a threshold
- Using qualified charitable distributions (QCDs) from an IRA to reduce taxable distributions (QCDs don't count toward MAGI)
- Harvesting capital losses to offset gains in years near a bracket cliff
- Delaying a profitable asset sale to the following year if it would push you over
Roth conversions and IRMAA
Roth conversions add to your MAGI in the year of conversion, which can push you into a higher IRMAA bracket two years later. A $60,000 conversion might move you from the first surcharge tier to the second -- costing $1,500+ per year in extra Medicare premiums for that year. Over several years of conversions, the cumulative IRMAA cost can meaningfully reduce the Roth conversion's tax advantage.
This doesn't mean avoiding conversions. It means modeling the IRMAA impact alongside the income tax savings. Many advisors recommend converting to the top of an IRMAA bracket rather than past it -- getting the Roth conversion tax benefit without triggering the next tier's surcharge.
How to appeal an IRMAA determination
If your income has dropped significantly since the year SSA is using, you can appeal. Qualifying life-changing events include: retirement or reduction in work hours, divorce, death of a spouse, loss of pension income, loss of income-producing property, or an employer settlement payment.
File Form SSA-44 with documentation of the life-changing event. SSA will use a more current year's income estimate instead of the two-year-old IRS data. New retirees often qualify because their income drops sharply in the year after a high-salary final working year.
Planning ahead
The most effective IRMAA management happens before you're on Medicare, not after. In the years before you turn 65, consider modeling your expected MAGI at 65 and 66 based on pension income, Social Security, IRA distributions, and capital gains. Identify which years will have elevated income (conversion years, asset sales, large RMDs) and which can be managed downward. The goal isn't to minimize income -- it's to avoid being $1 over a threshold when planning $50 under it would produce the same lifestyle.
The 2026 IRMAA brackets: exact thresholds and dollar costs
The 2026 IRMAA thresholds use 2024 MAGI. For single filers:
Tier 0 (standard): MAGI up to $109,000. Part B premium: $202.90/month. Part D: no surcharge.
Tier 1: MAGI $109,001 to $137,000. Part B premium: $284.10/month ($81.20 surcharge). Part D: $14.50/month surcharge.
Tier 2: MAGI $137,001 to $171,000. Part B premium: $405.80/month ($202.90 surcharge). Part D: $37.50/month surcharge.
Tier 3: MAGI $171,001 to $205,000. Part B premium: $527.50/month ($324.60 surcharge). Part D: $60.40/month surcharge.
Tier 4: MAGI $205,001 to $500,000. Part B premium: $649.20/month ($446.30 surcharge). Part D: $83.30/month surcharge.
Tier 5 (highest): MAGI above $500,000. Part B premium: $689.80/month ($486.90 surcharge). Part D: $91.00/month surcharge.
For married filing jointly, the thresholds are doubled: Tier 1 begins at $218,000, Tier 2 at $274,000, and so on. Married filing separately uses a dramatically compressed schedule: Tier 1 begins at $109,000 and Tier 5 begins at $403,000, with all the same income compressed into essentially two tiers between $109,000 and $403,000.
The annual cost difference between Tier 0 and Tier 1 for a single filer is ($81.20 + $14.50) x 12 = $1,148/year. Between Tier 0 and Tier 5, the annual difference is ($486.90 + $91.00) x 12 = $6,935/year. For a couple, double both figures. The value of IRMAA management is directly proportional to how many years you expect to be on Medicare and how close you are to a bracket boundary.
Pension lump sums and the two-year IRMAA lookback
The two-year lookback is IRMAA's most important structural feature for retirees who have recently taken large pension distributions. SSA uses your MAGI from the tax year that was filed two years ago. In 2026, that means your 2024 return determines your IRMAA tier for the year.
A retiree who took a $400,000 pension lump sum in 2024, reported it as a rollover on their tax return (avoiding immediate tax but with the amount included in gross income before the rollover adjustment), faces IRMAA calculated on that gross income. Wait -- does a direct rollover count toward MAGI for IRMAA purposes? The answer is generally no: a qualified direct rollover (Code G on the 1099-R) that goes directly from plan to IRA does not increase MAGI because the amount is excluded from adjusted gross income on Schedule 1. However, any portion that was not rolled over (cash taken) is included in AGI and counts toward MAGI for IRMAA.
Partial distributions taken as cash in the year before Medicare eligibility create IRMAA consequences two years later. A 63-year-old who takes a $60,000 partial lump sum as cash in 2024 to pay off a mortgage will have that $60,000 in their 2024 MAGI, potentially pushing their 2026 Medicare premium from Tier 0 to Tier 1 or Tier 2. Planning the timing and amount of pension distributions with the IRMAA lookback in mind avoids this two-year lag effect.
Required minimum distributions and IRMAA planning
Required minimum distributions are the dominant IRMAA driver for many retirees in their 70s and 80s. RMDs are included in MAGI in full. As a traditional IRA or 401(k) balance grows during the years before RMDs begin at 73, the eventual mandatory distributions increase correspondingly. A $1,200,000 IRA at 73 generates a first RMD of approximately $45,300 based on the 26.5 Uniform Lifetime Table divisor. Combined with Social Security and pension income, this total income may push a retiree into IRMAA Tier 2 or Tier 3 -- adding $200 to $330/month in Medicare premiums -- even if their pension and Social Security alone would have stayed in the standard tier.
The primary RMD and IRMAA management tools available to retirees include: partial Roth conversions in the years between retirement and RMD start (reducing the future traditional IRA balance and thus future RMDs), qualified charitable distributions once you turn 70.5 (QCDs reduce taxable income from IRA distributions by up to $111,000/year in 2026, directly lowering MAGI), and harvesting capital gains at zero rate in low-income years to diversify income sources into preferentially taxed capital gains rather than ordinary income.
Retirees with significant traditional IRA or 401(k) balances ($500,000 or more) should run a 20-year IRMAA projection that shows their expected MAGI by age, including projected RMDs, Social Security, and pension income. This projection often reveals that IRMAA tiers 2, 3, or 4 are unavoidable in later retirement years unless deliberate steps are taken in the earlier years to convert some of the traditional balance to Roth.
Married filing separately: when it helps and when it damages
For married couples where one spouse has significantly higher income, the intuition might be to file separately to protect the lower-income spouse's IRMAA tier. This intuition is almost always wrong. The IRMAA thresholds for married filing separately are dramatically compressed: Tier 1 begins at $109,000 -- the same as for single filers -- rather than the $218,000 threshold for married filing jointly. A couple filing jointly with $250,000 MAGI combined (each earning $125,000) would be in Tier 1 or possibly Tier 2 for joint filers, depending on the exact allocation. The same couple filing separately, if one spouse had $125,000 and the other $125,000, would each be in Tier 1 -- a similar outcome. But a couple where one spouse has $210,000 and the other has $50,000, filing jointly at $260,000 MAGI, hits Tier 2 jointly. Filing separately, the higher-income spouse at $210,000 hits Tier 4 (the MFS schedule compresses all income between $109,000 and $403,000 into Tier 4) while the lower-income spouse at $50,000 stays in Tier 0. In this specific case, the joint filing Tier 2 ($202.90/month surcharge each) is lower than the separately-filed result of Tier 4 plus Tier 0.
The IRMAA married filing separately schedule makes it advantageous only in very specific situations: typically when one spouse has extremely high income that would push a joint return to a high IRMAA tier and the filing cost of separate returns is worth the calculation. Run the specific numbers rather than relying on the general rule that separate filing is disadvantageous for IRMAA.
IRMAA appeals: the life-changing event process
IRMAA determinations can be appealed using SSA's life-changing event process when a significant event has reduced income since the lookback year. The IRS has designated 8 qualifying life-changing events: marriage, divorce or annulment, death of a spouse, work stoppage (including retirement), work reduction, loss of income from income-producing property, loss of employer pension income, and employer settlement payments.
Retirement is the most commonly used life-changing event for IRMAA appeals. If you retired in 2025 and your 2024 income (which SSA is using for 2026 IRMAA) included a full year of working salary but your 2026 income is pension-only and significantly lower, you can file an appeal using SSA Form SSA-44 (Medicare Income-Related Monthly Adjustment Amount -- Life-Changing Event). The appeal asks SSA to use a more recent tax year's income -- either 2025 or 2026 -- instead of the 2024 lookback.
The appeal process requires documentation. For a retirement event, SSA needs evidence of the retirement date (final pay stub, employer letter, or retirement benefit start date), and either a tax return for the more recent year or an estimate of expected income for the current year. If using a current-year estimate, SSA will grant a provisional reduction in IRMAA surcharges, then reconcile based on your actual tax return when filed. The appeal is filed directly with your local SSA office (in person or by mail) or online through your my Social Security account.
Approval timelines vary but are typically 30 to 60 days for straightforward retirement appeals with complete documentation. IRMAA surcharge adjustments, once approved, apply retroactively to the start of the Medicare benefit period for the year -- meaning if you appeal in March and your IRMAA is reduced, you receive credit for the January and February surcharges you already paid. Keep your appeal documentation organized because SSA may request additional verification during processing.
Roth conversion strategy for IRMAA avoidance
The gap years between retirement and Medicare eligibility (or between retirement and RMD start at 73) are the primary window for Roth conversions that reduce long-term IRMAA exposure. During these years, income is typically lower than it was during working years and lower than it will be after RMDs begin, creating a window where Roth conversions can be executed at moderate tax cost.
The strategy: identify the IRMAA tier thresholds for the year that your Roth conversion will affect (2 years after the conversion year, due to the lookback). Convert enough traditional IRA to Roth each year to fill your income up to but not over the next IRMAA tier boundary, while not triggering a jump to a higher IRMAA tier in the year of conversion's lookback year. This requires modeling both the conversion year's tax bracket and the IRMAA tier that will apply two years later.
For a single filer with $90,000 in pension and Social Security income in 2026, they are in IRMAA Tier 0 (under $109,000 MAGI). They can convert approximately $19,000 from traditional IRA to Roth without crossing into Tier 1, which begins at $109,001. Converting $19,000 at a 22% federal marginal rate costs approximately $4,180 in additional federal tax. The benefit: $19,000 less in future RMDs each year (once the account grows), and thus lower future MAGI that may prevent tier escalation. Over 15 years of systematic annual conversions at this level, the RMD reduction can prevent multiple tier jumps that would otherwise add $1,000 to $3,000/year in Medicare premiums indefinitely.
IRMAA and pension lump sums: planning the year-of-retirement income
The year you retire and begin Medicare is frequently the year with the most complex income interactions. A pension lump sum, a Roth conversion, a final salary, and the start of Medicare can all collide in the same calendar year, with IRMAA consequences that echo for two years.
A retiree who takes a $300,000 pension lump sum as cash (not as a direct rollover) in the year they turn 65 will have that amount included in their MAGI for the year. Two years later, SSA uses that income to set their IRMAA tier. A retiree who would otherwise have $90,000 in MAGI (pension plus Social Security) and be in Tier 0 can find themselves in Tier 4 or Tier 5 in the two years following the lump sum year -- adding $330 to $373/month in Medicare premiums for those two years. The IRMAA cost of a $300,000 cash lump sum taken without planning can easily be $7,000 to $9,000 over the two affected Medicare years.
The planning tool: take large pension distributions as direct rollovers to a traditional IRA rather than as cash. A qualified direct rollover (Code G on the 1099-R) does not increase MAGI -- the gross distribution appears on the tax return but is offset by the rollover amount on the same form. The IRMAA impact is zero for the properly executed rollover. Subsequent IRA distributions are then manageable in smaller annual amounts that can be calibrated to stay within specific IRMAA tiers.
The IRMAA calculator on this site's Medicare tool (/calculator/irmaa) lets you model different income scenarios and see the projected IRMAA tier and premium cost for each. Use it to compare: (a) taking the lump sum as cash this year, (b) taking the lump sum as a direct rollover and distributing smaller amounts in subsequent years, and (c) taking the annuity and avoiding the lump sum entirely. The after-Medicare-premium income comparison often reveals that the annuity or managed rollover strategy produces significantly more after-IRMAA lifetime income than a large cash lump sum in a single year.
Qualified charitable distributions: the IRMAA-free IRA withdrawal
Retirees who are 70.5 or older and have traditional IRA balances can use Qualified Charitable Distributions (QCDs) to satisfy all or part of their RMD without the distribution counting toward MAGI. A QCD is a direct transfer from your IRA to a qualified 501(c)(3) charity, up to $111,000 per person per year in 2026 (indexed for inflation). The distribution is excluded from gross income entirely -- it does not appear on your tax return as income, and it does not count toward your MAGI for IRMAA purposes.
For a retiree in IRMAA Tier 1 ($109,001 to $137,000 MAGI) with a $12,000 annual RMD that is pushing them into Tier 1, using a $12,000 QCD to a charity they were already planning to support eliminates the RMD income from MAGI, potentially dropping them back to Tier 0 and saving $1,148/year in IRMAA surcharges. The net effect is that the charitable contribution costs nothing in Medicare premiums that would have been paid anyway. Effectively, the government subsidizes the charitable gift through IRMAA savings.
QCDs count toward satisfying your RMD requirement. If your 2026 RMD is $18,000 and you execute a $18,000 QCD, you have satisfied the full RMD with no taxable income. Amounts above the RMD can also be executed as QCDs up to the $111,000 annual limit, continuing to reduce future IRA balances and future RMDs. The QCD is one of the most powerful tax planning tools available to retirees 70.5 and older and is particularly valuable for those near IRMAA tier boundaries.
Tracking your IRMAA tier year by year
IRMAA is not a one-time determination. SSA resets it annually based on the most recent available tax return. A year with unusually high income (a Roth conversion, a large capital gain, a pension lump sum) will typically produce elevated IRMAA in the two years following -- and then return to normal once the income event has passed through the lookback window. Retirees who understand the two-year lag can plan proactively: if you know 2025 will have unusually high income due to a planned transaction, you can model the 2027 IRMAA impact before executing, potentially restructuring the transaction to minimize the lookback consequence.
The practical tracking approach: maintain a simple annual record of your MAGI and the IRMAA threshold for the current year. When your MAGI is within $15,000 to $20,000 of the next tier boundary, any planned discretionary income event (Roth conversion, investment sale, large IRA withdrawal) should be evaluated against the IRMAA impact before execution. The IRMAA calculator at the IRMAA calculator on this site lets you enter your current and projected MAGI and see the exact tier and annual cost for each scenario, making this comparison straightforward.
IRMAA and Social Security: how benefits interact
Social Security benefits are themselves included in MAGI for IRMAA purposes -- but only the taxable portion. Up to 85% of Social Security benefits are included in gross income for federal tax purposes depending on total income. For retirees with pension income, IRA distributions, and Social Security, all three sources compound toward MAGI simultaneously, and the IRMAA threshold can be crossed by the interaction of all three rather than any single source in isolation.
Retirees who are in the first years of Social Security and Medicare simultaneously -- ages 65 to 72 -- face the tightest IRMAA management window. In these years, SS benefits are fully in payment, RMDs have not yet reached their peak (or have just begun at 73), and pension income is stable. Strategic decisions about when to take Social Security (delayed to 70 for maximum benefit), when to begin Roth conversions (earlier in this window, while income is lower), and how to structure IRA withdrawals to stay within specific MAGI thresholds determine the IRMAA tier for years and sometimes decades of Medicare enrollment. The compounding effect of getting these decisions right in the early Medicare years -- avoiding tier escalations that would persist for 10 to 20 years -- is one of the highest-leverage planning opportunities in retirement income management. A retiree who manages IRMAA tier boundaries from age 65 to 75 through disciplined Roth conversions, QCDs, and income timing can save $15,000 to $40,000 in Medicare surcharges over that decade compared to a retiree with identical income who takes no proactive steps. The IRMAA calculator on this site lets you model each year's projected MAGI against the current tier thresholds to identify exactly which income decisions move you across a boundary and which ones keep you safely within a tier. Run it before any significant income event -- pension distribution, Roth conversion, property sale, or IRA withdrawal -- to know the Medicare cost before you commit. IRMAA planning is one of the few areas of retirement income management where relatively modest changes in timing and structuring produce large, measurable, and permanent improvements in after-tax income. The thresholds are fixed and known. The lookback period is predictable. The tools are available. The only variable is whether you plan proactively or discover the surcharge after the income event has already occurred.
Use the present value calculator to frame pension income against total lifetime retirement income before modeling IRMAA exposure -- the size of the income stream determines which bracket tiers are at risk. Use the pension income tax calculator to model the combined federal tax and IRMAA surcharge on pension income alongside Social Security, since both work through the same MAGI figure but through different mechanisms.