IRMAA Will Impact Your Clients and Your Business Model

Most financial professionals build retirement plans around investments, taxes, and Social Security timing. Very few build them around health costs — and almost none build them around Medicare's IRMAA. That's a problem, because IRMAA sits at the intersection of all three: it is a health-related surcharge, triggered by taxable income, that gets collected straight out of a client's Social Security benefit.

IRMAA stands for the Income-Related Monthly Adjustment Amount. It is a surcharge that is added to your clients' base monthly Medicare premiums, and it is based on the amount of income they receive in retirement.

Here's the part that makes it unavoidable: everyone in retirement earns some sort of income, whether it is a pension, Social Security, wages, investments, or a combination of these different types. The higher the income an individual has, the higher the Medicare premiums they are subjected to. There is no opting out of the calculation — the only question is whether the plan accounts for it or ignores it.

This case study — originally published as a one-page overview for financial professionals in 2023 — walks through what IRMAA is, which income it counts, what it can cost a single ordinary client, and why that math should change how advisors think about their own business model.

IRMAA is determined by modified adjusted gross income (MAGI), and the Social Security Administration looks at a tax return from two years prior to set the current year's premium. You can see the full mechanics on our page covering how IRMAA is calculated. What matters for planning purposes is the breadth of income the calculation recognizes.

The original overview listed the types of income recognized by IRMAA:

Two entries on that list surprise almost everyone. First, capital gains including the home — a downsizing sale that produces a large taxable gain can push a client into an IRMAA bracket two years later. Second, dividends including municipalities — tax-exempt municipal bond interest is excluded from ordinary income tax, but it is added back for IRMAA's MAGI. A "tax-free" bond ladder is not IRMAA-free.

Notice what dominates the right-hand column: traditional, tax-deferred retirement accounts. The default American retirement portfolio — decades of pre-tax 401(k) and IRA contributions — is precisely the asset type that generates IRMAA-countable income when it is withdrawn or when required minimum distributions begin. The savings behavior advisors have encouraged for thirty years is the same behavior that creates IRMAA exposure at the end of the plan.

To start, it is important to note that an individual's Medicare costs are deducted directly from their Social Security benefit. IRMAA never shows up as a separate invoice. It shows up as a smaller Social Security check — which is exactly why so many clients (and advisors) never see it coming.

With that in mind, the original 2023 analysis modeled a deliberately ordinary client: someone who is 55 years old, will have a Social Security benefit of $3,200 per month in retirement, and holds a traditional 401(k) of $500,000.

Based on this simple scenario, this individual was projected to have approximately $465,000 deducted from their Social Security benefit over the course of retirement — the combined result of hitting an IRMAA income bracket and factoring in Medicare's premium inflation rates.

Sit with that number for a moment. This is not an ultra-high-net-worth edge case. A $500,000 401(k) and a $3,200 Social Security benefit describe a successful teacher, engineer, or small-business owner — the core client of most advisory practices. Yet the projection showed nearly half a million dollars of expected Social Security income being consumed by Medicare premiums and surcharges over a full retirement.

The mechanics behind the projection are worth understanding. Medicare premiums have historically grown faster than general inflation, and faster than Social Security's cost-of-living adjustments. Because premiums are deducted from the Social Security check, a benefit that grows slowly while premiums grow quickly means the net check flattens — and in long-horizon projections, the Medicare deduction line eventually crosses a painful share of the benefit itself. Landing in an IRMAA bracket accelerates that crossover, because the client is no longer paying the base premium but a multiple of it.

Historical context makes the bracket cliff concrete: figures like the 2023 base Part B premium of $164.90 per month only tell part of the story — a beneficiary in an IRMAA tier paid that base amount plus a surcharge on Part B and Part D, and crossing a threshold by even one dollar of MAGI triggered the full surcharge for the year. For current thresholds, see the 2025 IRMAA brackets.

The original overview made a claim that should stop every advisor mid-scroll: less than 1% of financial professionals are educated on this subject and are able to help clients with it.

Read that alongside the case study above. A surcharge capable of consuming hundreds of thousands of dollars of a mainstream client's retirement income was, at the time, being actively planned for by almost nobody in the profession. That gap cuts two ways for an advisory practice:

• Risk: Your existing clients are exposed to a cost your current planning process doesn't model. When they discover it — usually via a smaller-than-expected Social Security deposit or a determination letter — they will ask why their plan never mentioned it. Some will ask a different advisor.
• Opportunity: Learning about IRMAA will not only allow you to offer unique support to your current client base, it will also allow you to attract new clients who are not being serviced correctly by their current team.

The competitive dynamics are unusual. Most differentiators in wealth management — performance, fees, service models — are contested by every firm in the market. IRMAA planning, by contrast, is a substantive capability with demonstrable dollar impact that the overwhelming majority of competitors simply do not offer. An advisor who can show a prospect the projected Medicare deduction line inside their own retirement plan is having a conversation no one else has had with them.

It also reframes the value conversation. Reallocating retirement assets to minimize taxes and Medicare surcharges has repeatedly shown how to increase production, acquire new clients, and ultimately transform a practice — because the value is not an abstract basis-point debate; it is a specific, avoidable six-figure cost the advisor found and addressed.

IRMAA is driven by taxable income, and taxable income in retirement is substantially a product of planning decisions. That's what makes the surcharge actionable rather than merely unfortunate. In practice, IRMAA-aware planning revolves around a few levers:

• Asset location and reallocation. Shifting the mix between tax-deferred, taxable, and Roth assets over time changes how much MAGI a given spending level generates in the Medicare years.
• Withdrawal sequencing. Which accounts fund which years of spending determines when income spikes occur — and IRMAA's two-year lookback means income at 63 sets premiums at 65.
• Roth conversions, deliberately timed. Conversions raise income in the conversion year but can permanently lower future MAGI, RMDs, and IRMAA exposure. Modeling the trade-off — including any temporary bracket crossing during the conversion window — is the heart of the analysis. Strategies for managing the income side are covered in how to reduce MAGI.
• One-time income events. Home sales, business sales, and large capital-gain realizations deserve a two-year-forward IRMAA check before they happen, not after.
• Appeals when life changes. When a client retires or experiences another qualifying life-changing event, the surcharge based on their old working income can be challenged. The process runs through Form SSA-44; our guide to the IRMAA appeal covers the qualifying events and documentation.

None of this requires exotic products. It requires modeling — the ability to project Medicare premiums, IRMAA brackets, and Social Security deductions across a full retirement under different income strategies, and to show a client the difference between the default path and the planned one. That is precisely the analysis behind the $465,000 figure in this case study, and it is the analysis RetirementAdvisorPro was built to put in every advisor's hands.

This analysis was originally published in 2023 as a one-page educational overview by IRMAA Certified Planner, an organization created to help educate financial professionals about the concepts, rules, and regulations surrounding Medicare's IRMAA. The dollar figures above — the $3,200 monthly benefit, the $500,000 401(k), and the approximately $465,000 lifetime projection — are preserved from that original analysis and reflect assumptions as of its publication, including Medicare premium inflation rates in effect at the time.

The thresholds, premiums, and surcharge amounts change every year, so the specific numbers for any client should always be modeled against current figures — start with the current IRMAA brackets. The underlying conclusion, however, has only strengthened since 2023: Medicare's income-related surcharges are a structural feature of retirement income planning, and the advisors who can model them hold a real advantage over those who can't.