Decision Prep
IRMAA: Why Income Can Raise Medicare Costs
Higher-income beneficiaries pay more for Part B and Part D. Here is how the surcharge works, when it shows up, and what to do if your income has dropped.
The short answer
IRMAA stands for Income-Related Monthly Adjustment Amount. It is an additional amount added to your Part B premium and your Part D premium if your income — as reported on your federal tax return — is above certain thresholds. The thresholds and bracket amounts are set each year by Medicare and Social Security. Most people are below the thresholds and pay nothing extra. People above the thresholds pay an extra amount per month, in addition to whatever their plan charges, for as long as their income stays in that range. The surcharge is based on Modified Adjusted Gross Income (MAGI) — usually from your tax return two years ago.
Discovering you owe a surcharge nobody mentioned earlier is unsettling. It is also fixable in some cases. The path is procedural, not personal.
Why this exists
When Part B was created, the premium was structured to cover roughly 25% of program costs, with general revenue covering the rest. Over time, Congress added higher premium tiers for higher-income beneficiaries — the wealthier you are, the larger a share of your own Part B costs you pay through the premium. Part D got a parallel income-based structure. IRMAA is that structure in action.
The result is that two beneficiaries on the same plan can pay meaningfully different premiums based on income alone. The plan doesn’t see this. The carrier doesn’t see this. Social Security calculates it; Medicare adds it to your monthly bill.
How it shows up
Most people first encounter IRMAA on their initial Medicare bill — or, if Medicare premiums are deducted from a Social Security check, in the deduction itself. Social Security sends a notice early in the year explaining the calculation. The notice tells you: your MAGI from two tax years prior, the bracket that income falls into, the extra amount being added to Part B per month, the extra amount being added to Part D per month, and your right to appeal.
When you can ask for a reconsideration
Social Security recognizes that income from two years ago does not always reflect current income. If you have experienced a “life-changing event” that reduced your income, you can request that they use a more recent year instead. The qualifying events are listed on Form SSA-44 and generally include: marriage, divorce or annulment, death of a spouse, work stoppage (retirement), work reduction, loss of income-producing property (involuntary), loss of pension income, and employer settlement payment ending.
You file Form SSA-44 with your local Social Security office, along with documentation. If they accept the request, they recalculate using the more recent year’s income. The form is not difficult. The paperwork is the part that takes time. It is worth doing if your income has genuinely fallen.
How this applies to you
If you are about to enroll in Medicare. Look at your tax return from two years ago. If your MAGI was above the threshold, plan for IRMAA on your first Medicare bill. If your current income is meaningfully lower because of retirement or work reduction, plan to file SSA-44 soon after you enroll.
If you are already enrolled and just got an IRMAA notice for the first time. Open the letter. Check the income year it references. If your income has dropped because of a qualifying event, file SSA-44.
If your income changes mid-year. A late-year retirement, a divorce, a spouse’s death — any of these can dramatically change your IRMAA position. You do not have to wait for the next tax cycle. SSA-44 can be filed when the event occurs, with documentation.
If your income is well above any threshold. Planning ahead for IRMAA as part of retirement-income strategy — Roth conversions, capital gains timing, and the like — is where licensed financial and tax professionals add real value.
What this is not
It is not a tax. It is a Medicare premium adjustment. It does not affect your tax return.
It is not permanent. If your income drops below the threshold in a future year, the surcharge drops with it — usually with the same two-year lag, unless you file SSA-44 for a faster adjustment.
It is not a penalty. It is a structural part of how Medicare premiums are set for higher-income beneficiaries.
It is not legal, tax, or financial advice. If your income picture is complex — capital gains, Roth conversions, business income, trust distributions — talk to a tax professional or a fee-only financial planner about income management around the IRMAA brackets.
Knowing the rule is what gives you the standing to use it.
The Clearing does not sell insurance, recommend specific plans, or earn commissions. When you are ready to decide, verify the details on Medicare.gov or with a SHIP counselor in your state.
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