IRMAA: Tools to Anticipate, Adjust, and Pay
Medicare is not, as it’s often called, free healthcare starting at 65. It has a cost, and that cost rises with income in a way that catches many by surprise. Most retirees assume Medicare premiums are fixed. You sign up, the premium is deducted from Social Security, and it becomes just another background expense. For many people that assumption holds. For others, it does not. And when it does not, the surprise can be costly.
The reason is IRMAA, the Income-Related Monthly Adjustment Amount. IRMAA is an added surcharge applied to Medicare Part B and Part D premiums once income crosses certain levels. The structure is not gradual. It works in sharp brackets. If income exceeds a threshold by even one dollar, the higher premium applies for the entire year. There is no phase-in and no smoothing.
IRMAA was not part of Medicare when the program began. It was introduced in 2003 as part of the Medicare Modernization Act and implemented a few years later. The intent was straightforward. Medicare costs were rising, and policymakers wanted higher-income retirees to pay a larger share. Rather than raise premiums for everyone, IRMAA targeted those with higher reported income. In theory, that made sense. In practice, income is not the same as wealth, and retirement income often arrives unevenly. A system built on annual snapshots of income does not always reflect retirees’ true financial picture.
Timing adds another layer of frustration. Medicare premiums are based on income from two years prior. A high-income year that feels distant can still produce higher monthly Medicare premiums. By the time the increase appears, the income recognition that caused it is already behind you.
Retirement income is rarely smooth, which makes this system awkward. One year might include a Roth conversion, a business sale, real estate gains, or large capital gains. The next year might look far more modest. IRMAA does not average those years together. One spike can raise premiums for a full year even if income quickly declines.
At higher income levels, the cost becomes meaningful. At the top IRMAA tiers, Part B premiums are more than three times the standard amount. When Part D surcharges are included, Medicare becomes a noticeably larger line item than most retirees expect. For example, a married couple with income modestly above $250,000 could see their combined Part B and Part D premiums increase by roughly $2,000 to $3,000 per year compared to the standard premium level. At a higher income level, around $350,000, that additional cost can approach $9,000 per year, with further increases at even higher income brackets. The coverage does not change. Only the premium does.
None of this means IRMAA should drive every planning decision. Many decisions that trigger IRMAA are still part of good overall strategies. Roth conversions can make sense and can lead to lower future IRMAA premiums despite the upfront pain. Selling a concentrated stock position can reduce risk and enhance returns. Required minimum distributions are unavoidable. The issue is not whether income should be recognized, but whether its timing can be managed deliberately. Spreading income across years can reduce how often IRMAA thresholds are crossed and by how much they are crossed. Partial Roth conversions instead of large ones, coordinating income between spouses, and being thoughtful about when gains are realized can all help. These steps do not eliminate IRMAA in every case, but they can soften its impact.
There is also a rule many retirees never learn. IRMAA is not always final. If income drops because of a qualifying life-changing event, Medicare will consider requests for a reduction in premiums using Social Security Form SSA-44. Qualifying events include retirement or work stoppage, reduction in work hours, death of a spouse, divorce, marriage, unexpected loss of income-producing property, loss of pension income, and certain employer settlement payments. Voluntary income events like selling investments at a gain do not qualify, but many real-life changes do.
The adjustment is not automatic. Medicare does not know that you retired or that income dropped unless you tell them. Form SSA-44 allows you to report income that has already declined or income you expect to be lower going forward. Documentation is required, and the process takes effort, but the potential savings can be significant. This option is underused, largely because people do not know it exists. Many retirees simply assume the higher premium is locked in and move on, even when an adjustment may be available.
Another common misunderstanding involves how Medicare premiums are paid and how that interacts with Health Savings Accounts. For most retirees, Part B and Part D premiums are automatically deducted from Social Security. Because the money never passes through a bank account, people would never think of trying to pay those premiums with HSA funds. However, Medicare premiums, including IRMAA surcharges, are qualified medical expenses for HSA purposes. Even when premiums are withheld from Social Security, you can reimburse yourself from your HSA if you have one.
This ability to draw down an HSA account is important for tax planning, especially since HSAs lack the stretch benefits of other retirement accounts. If a spouse is the beneficiary, the HSA simply becomes their HSA. If anyone else inherits it, the account is no longer an HSA, and the entire balance generally becomes taxable in the year of death. Because of that, many retirees choose to be more intentional about spending HSA dollars during retirement, particularly on expenses like Medicare premiums that are unavoidable anyway.
HSAs cannot be used for Medigap premiums, but they can be used for Part B, Part D, Medicare Advantage premiums, and IRMAA surcharges. Used thoughtfully, HSA dollars can reduce taxes, improve cash flow, and prevent those funds from becoming an unexpected tax bill later.
IRMAA is a type of income tax. It is not a penalty, but it can certainly feel that way when it shows up unexpectedly. It does not appear clearly on a tax return, does not affect withholding, and often shows up two years after the income that caused it. Because of this timing, it is easy to overlook and difficult to anticipate.
The goal is not to avoid income. The goal is awareness. Understanding the thresholds, the two-year lookback, when a high-income year is temporary, when an appeal may be possible, and how HSAs fit into the picture can help prevent surprises.
Many of the decisions that trigger IRMAA are good ones, but timing matters. If you would like to understand how income decisions today might affect Medicare premiums down the road, we’re always available to answer questions and help you plan ahead.
Eric Wathen, CFA®