IRMAA (Income-Related Monthly Adjustment Amount)
A Medicare premium surcharge added to Part B and Part D for higher-income beneficiaries, set by a two-year look-back at modified adjusted gross income and applied as an all-or-nothing income "cliff."
Detailed Explanation
IRMAA is the income-related surcharge that higher-income Medicare beneficiaries pay on top of the standard Part B and Part D premiums, authorized by Section 1839(i) of the Social Security Act and administered by the Social Security Administration. For 2026 the standard Part B premium is $202.90 per month, and IRMAA adds a tiered surcharge above it: $81.20, $202.90, $324.60, $446.30, or $487.00 per month, producing total Part B premiums as high as $689.90. A separate Part D IRMAA adds $14.50 to $91.00 per month on top of the drug-plan premium. The tier is set by modified adjusted gross income (MAGI), defined for IRMAA as adjusted gross income (Form 1040 line 11) plus tax-exempt interest (line 2a), from the tax return two years earlier, so 2026 premiums are based on 2024 MAGI. The single-filer surcharge begins above $109,000 of MAGI and the married-filing-jointly surcharge above $218,000. IRMAA is a cliff, not a graduated rate: crossing a threshold by a single dollar imposes the entire higher surcharge for the whole year, and because each enrolled spouse pays their own surcharge, a couple can pay it twice. Married-filing-separately filers who lived with a spouse face a compressed, harsher schedule that jumps almost to the top with very little income. IRMAA is usually withheld from the Social Security benefit, and the Medicare hold-harmless rule does not protect IRMAA payers, so a surcharge can actually shrink the net Social Security check. A one-time income spike, such as a large capital gain, a Roth conversion, or a home sale above the exclusion, raises MAGI two years before it shows up as higher premiums, and those spikes are not appealable life-changing events; only the eight events on Form SSA-44 (work stoppage, work reduction, marriage, divorce, death of a spouse, loss of pension, loss of income-producing property, and an employer settlement) support a reduction request. Because IRMAA is redetermined every year, a one-year spike raises premiums for one year only.
Key Points
- 2026 Part B: $202.90 base premium, with IRMAA add-ons of $81.20 / $202.90 / $324.60 / $446.30 / $487.00 (total up to $689.90 per month).
- 2026 Part D IRMAA: $14.50 to $91.00 per month on top of the drug-plan premium.
- MAGI for IRMAA equals AGI (line 11) plus tax-exempt interest (line 2a), from two years prior (2026 uses the 2024 return).
- It is a cliff: one dollar over a threshold triggers the full surcharge for the entire year.
- Each spouse enrolled in Medicare pays their own IRMAA, so couples can pay it twice.
- One-time spikes (capital gain, Roth conversion, home sale) are not appealable; only the eight SSA-44 life-changing events are.
Practical Example
A married couple filing jointly has 2024 MAGI of $219,000, just $1,000 over the $218,000 threshold. For 2026 each spouse on Medicare pays an extra $81.20 of Part B plus $14.50 of Part D each month, about $1,148 per person for the year, or roughly $2,297 for the couple, all triggered by the last $1,000 of income.
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Learn about Tax Planning & StrategyRelated Terms
Modified Adjusted Gross Income (MAGI)
Adjusted gross income with certain items added back, used to gate eligibility for credits, deductions, surcharges, and Medicare IRMAA, with the exact add-backs differing by rule.
Adjusted Gross Income (AGI)
Adjusted Gross Income is your total gross income reduced by specific above-the-line deductions, used as the starting point for calculating your federal taxable income.
Roth Conversion
The process of moving funds from a traditional pre-tax retirement account (IRA, 401(k)) to a Roth account, paying ordinary income tax on the converted amount in exchange for tax-free future growth and withdrawals.
Qualified Charitable Distribution (QCD)
A direct transfer from an IRA to a qualified charity by a taxpayer age 70 and a half or older, satisfying the RMD without inclusion in taxable income.
Net Investment Income Tax (NIIT)
A 3.8 percent additional federal tax on net investment income for taxpayers with modified adjusted gross income above statutory thresholds.
Required Minimum Distribution (RMD)
The annual minimum amount that must be withdrawn from most retirement accounts after a specified age, taxed as ordinary income.
Capital Gain
The profit realized from the sale of a capital asset such as stock, real estate, or cryptocurrency, taxed at preferential rates if held longer than one year.
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