What IRMAA is and who pays it
The Income Related Monthly Adjustment Amount (IRMAA) is a Medicare premium surcharge on Part B and Part D for higher-income beneficiaries. It is administered jointly by the Social Security Administration and the Centers for Medicare & Medicaid Services and is determined by Modified Adjusted Gross Income (MAGI) from the tax return filed two years earlier.
2025 IRMAA tiers
| MAGI (2023 tax return) | Total monthly Part B premium | Approx. annual cost per couple |
|---|---|---|
| ≤ $206,000 | $185.00 | $4,440 |
| $206,001 – $258,000 | $259.00 | $6,216 |
| $258,001 – $322,000 | $370.00 | $8,880 |
| $322,001 – $386,000 | $480.90 | $11,542 |
| $386,001 – $749,999 | $591.90 | $14,206 |
| ≥ $750,000 | $628.90 | $15,094 |
Single filers face the same surcharge structure at roughly half the MAGI thresholds. Part D adds its own surcharge on top of whatever drug-plan premium the beneficiary chose.
The two-year lookback
IRMAA in calendar year N is determined by the MAGI on the tax return for year N–2. Practical implications:
- Income at age 63 sets IRMAA at age 65.
- A Roth conversion this year shows up on Medicare premiums two years later.
- A one-time event (sale of a business, large capital gain, inheritance from a non-spouse) creates a single-year IRMAA spike that is recoverable in the following year.
Why IRMAA is a cliff, not a slope
Each tier is a hard threshold. One dollar of MAGI above a tier breakpoint moves the beneficiary to the higher surcharge for the entire year — and for both spouses on a joint return. For a couple, crossing the first tier costs approximately $1,776/year, and crossing the next costs approximately $4,440/year.
Common income events that trigger IRMAA
- Roth conversions in retirement.
- Required Minimum Distributions starting at age 73 or 75.
- Concentrated stock or RSU sales after retirement.
- Sale of a business or commercial real estate.
- Inherited IRA distributions under the 10-year rule.
- Pension lump-sum elections.
Form SSA-44 — appealing a life-changing event
SSA-44 lets beneficiaries request that IRMAA be recalculated using a more recent year's income when one of eight qualifying life-changing events has occurred:
- Marriage
- Divorce or annulment
- Death of a spouse
- Work stoppage
- Work reduction
- Loss of income-producing property
- Loss of pension income
- Employer settlement payment
Retirement is the most common trigger. A client who retires in March and whose income drops substantially can file SSA-44 with their first Medicare enrollment and avoid waiting two years for the surcharge to fall.
Planning strategies that work
1. Convert to the IRMAA tier, not the bracket
Set the conversion ceiling at the next IRMAA breakpoint, not the next federal bracket. The breakpoint usually binds first.
2. Bunch capital gains into pre-Medicare years
Realize concentrated positions at age 62–63 instead of 65+. The same dollars never trigger IRMAA if they are out of the system before the lookback applies.
3. Use QCDs to lower MAGI in retirement
Qualified Charitable Distributions from an IRA reduce both AGI and MAGI for IRMAA purposes, unlike itemized charitable deductions which do not.
4. Coordinate with surviving-spouse modeling
A surviving spouse re-enters the IRMAA tables as a Single filer at thresholds roughly half as high. The bigger lifetime IRMAA risk is often the year after a spouse dies, not in joint-filing years.
Annual IRMAA checklist
- Mid-November: project current-year MAGI; identify the binding breakpoint for the year two ahead.
- Stress-test any Roth conversion or capital gain against that breakpoint.
- Schedule QCDs before the first dollar of RMD leaves the IRA.
- If a qualifying life event occurred, file SSA-44 immediately — do not wait for the surcharge notice.
Stephen Arnold
Founder & CEO of Wealth Protection Advisory. Pension and retirement planner with 20+ years advising small business owners. Creator of the Designer DB Plus® strategy and author of Designer DB Plus® Game-Changing Tax Reduction & Retirement Strategy.