How the Two-Year IRMAA Lookback Works in 2026
Medicare IRMAA (Income-Related Monthly Adjustment Amount) is an additional premium surcharge added to standard Medicare Part B and Part D premiums for high-income beneficiaries whose modified adjusted gross income exceeds certain thresholds. Medicare Part B premiums are not the same for everyone. If your modified adjusted gross income (MAGI) exceeds certain thresholds, you pay an Income-Related Monthly Adjustment Amount (IRMAA) on top of the standard premium. Understanding "medicare irmaa 2026" means knowing that your 2024 tax return determines your 2026 Part B and Part D surcharges, creating a two-year window to plan income reductions.
Medicare uses a two-year lookback to set your Part B and Part D premiums. For 2026 premiums, the Social Security Administration (SSA) reviews your 2024 tax return. Your 2024 MAGI — adjusted gross income plus tax-exempt interest — determines whether you pay the standard $185.00 monthly Part B premium or a higher amount with an IRMAA surcharge.1
This lag creates a planning opportunity. A retiree who sold a business or realized a large capital gain in 2024 may face an unexpected surcharge in 2026. Conversely, someone who reduced their income in 2024 through strategic withdrawals or Roth conversions will see lower premiums two years later.
The lookback applies to both Part B and Part D IRMAA. Part D uses separate income brackets, so a retiree in a high tier may pay surcharges on both premiums simultaneously. The SSA notifies beneficiaries by mail in November or December of the year before the premium change takes effect.
Key 2026 Bracket Thresholds and Monthly Surcharge Amounts
The 2026 IRMAA structure has five tiers for Part B, with surcharges ranging from 35% to 85% of program costs above the base premium. The table below shows the monthly surcharge amounts for single filers and married couples filing jointly.
| Filing Status | 2024 MAGI Range | Part B Monthly Surcharge | Total Part B Premium |
|---|---|---|---|
| Single | $106,000 or less | $0 | $185.00 |
| Single | $106,001 – $133,000 | $74.00 | $259.00 |
| Single | $133,001 – $171,000 | $185.00 | $370.00 |
| Single | $171,001 – $214,000 | $296.00 | $481.00 |
| Single | $214,001 – $500,000 | $407.00 | $592.00 |
| Single | Over $500,000 | $443.00 | $628.00 |
For married couples filing jointly, the thresholds double: $212,000, $266,000, $342,000, $428,000, and $750,000.2 A couple with 2024 MAGI of $250,000 falls into the second tier, paying a $74 monthly surcharge per person — $1,776 total annually for both.
Part D IRMAA surcharges add another layer. For a single filer with MAGI between $106,001 and $133,000, the Part D surcharge is approximately $13.70 per month.3 Higher tiers add $35.30, $56.80, $78.30, or $85.80 monthly.3
Roth Conversion Timing: When It Offsets Future IRMAA Surcharges
Roth conversions increase MAGI in the year of conversion, which can trigger higher IRMAA surcharges two years later. The key is timing conversions to fall outside the lookback window for years when you expect lower premiums.
Consider a retiree who plans to convert $50,000 from a traditional IRA to a Roth IRA. If they convert in 2025, that $50,000 appears on their 2025 tax return and affects 2027 premiums1. If they wait until 2026, the conversion impacts 2028 premiums. The optimal strategy is to convert in a year when the retiree's other income is low enough to stay within a lower IRMAA bracket.
A practical approach: convert in the year after a major life event that reduces income, such as selling a business or retiring mid-year. The lower base income offsets the conversion amount, keeping MAGI below the next bracket threshold. For example, suppose a retiree retires in June 2025 and has only six months of salary. Converting roughly $40,000 in 2025 may keep their MAGI under the $106,000 threshold1, avoiding any 2027 surcharge.
RMD Scheduling and IRMAA Bracket Management for Retirees
Required minimum distributions (RMDs) from traditional IRAs and 401(k)s can push retirees into higher IRMAA brackets unexpectedly. The first RMD year — age 73 under current rules — often coincides with other income sources, creating a MAGI spike.
One strategy is to take RMDs early in the year and use the funds for qualified charitable distributions (QCDs). A QCD transfers IRA assets directly to a qualified charity, counting toward the RMD requirement without increasing MAGI. For 2024, a retiree with a $30,000 RMD could direct $20,000 as a QCD, reducing their taxable income by that amount and potentially lowering their 2026 IRMAA bracket.
Another tactic is to coordinate RMD timing with capital gains harvesting. If a retiree expects to be in a higher bracket in 2026 due to an RMD, they might delay selling appreciated assets until 2027, when the RMD impact has passed. This avoids stacking two income events in the same lookback year.
Filing a Life-Changing Event Appeal to Reduce Your IRMAA
The SSA allows IRMAA appeals for qualifying life-changing events using Form SSA-44. These events include retirement, divorce, death of a spouse, loss of pension income, or a significant reduction in work hours. If you retired in 2025, you can file an SSA-44 to request that the SSA use your current income instead of your 2024 MAGI.
The appeal process requires documentation. For retirement, submit a letter from your former employer confirming your retirement date and final salary. For a reduction in work hours, provide pay stubs showing the decrease. The SSA typically processes appeals within 60 to 90 days, and approved reductions apply retroactively to the start of the premium year.
A common mistake is filing too late. File the SSA-44 as soon as you receive your IRMAA notice, ideally within 60 days. If you miss the window, you can still file mid-year, but the reduction applies only from the month of approval, not the start of the year.
Planning Ahead: 2025 Income Decisions and 2027 Premium Implications
The two-year lookback means 2025 income decisions directly affect 2027 Medicare premiums. Retirees should model their 2025 MAGI against the 2027 bracket thresholds, which are adjusted annually for inflation but typically follow similar tier structures.
Key 2025 decisions to evaluate:
- Roth conversion amounts: Keep conversions small enough to stay within a single bracket tier.
- Capital gains realization: Delay large gains until a year with lower other income.
- HSA contributions: Maximize health savings account contributions, which reduce MAGI dollar-for-dollar.
- QCD timing: Schedule QCDs early in the year to reduce taxable IRA distributions.
For a retiree with $120,000 in 2025 income from pensions and Social Security, adding a $20,000 Roth conversion pushes MAGI to $140,000 — into the second IRMAA tier for 2027. Reducing the conversion to $10,000 keeps MAGI at $130,000, staying in the first tier and saving approximately $888 in annual surcharges per person1.
Practitioner Case Study: Real-World IRMAA Optimization Scenario
This scenario is illustrative and does not represent any specific individual.
Michael, age 68, retired in June 2024. His 2024 MAGI was $145,000 — including six months of salary and a $30,000 consulting payment. Based on that return, his 2026 Part B premium includes a $185 monthly surcharge, totaling $2,220 annually.
In 2025, Michael's income dropped to approximately $85,000 from pension and Social Security alone1. He filed an SSA-44 appeal in January 2026, providing his 2025 tax return and a retirement letter. The SSA approved the appeal in March 2026, reducing his 2026 Part B premium to the standard $185.00 per month. He also received a refund for the surcharges paid in January and February.
Michael then planned his 2025 Roth conversions carefully. He converted $20,000 in December 2025, bringing his 2025 MAGI to $105,000 — just under the $106,000 threshold for 20271. This preserved his standard premium for two more years while moving funds to a Roth IRA for tax-free growth.
Your Next Step
Review your 2024 tax return and calculate your MAGI. Compare it against the 2026 IRMAA bracket thresholds. If you are within $10,000 of the next bracket, identify income reduction strategies for 2025 — such as QCDs, HSA contributions, or delaying capital gains — to lower your 2027 premiums. If you experienced a qualifying life event in 2025, download Form SSA-44 and gather documentation now. File the appeal as soon as you receive your 2026 IRMAA notice to maximize savings.