Avoiding Irmaa Can Actually Cost You More In Retirement: A Financial Adviser Explains Why And What You Can Do Instead

For many retirees, few acronyms generate more anxiety than IRMAA.

Countless articles, videos and financial discussions warn retirees to stay below the next Medicare premium threshold. But what if avoiding an IRMAA surcharge causes you to pay more over the course of retirement?

In many cases, that's what can happen when annual tax planning takes priority over lifetime tax planning.

The income-related monthly adjustment amount (IRMAA) is the Medicare surcharge higher-income beneficiaries might pay for Medicare Part B and Part D coverage.

Because IRMAA is based on your modified adjusted gross income (MAGI) from two years earlier, many retirees become intensely focused on staying below the next surcharge threshold.

That focus is understandable — but it can also be expensive.

Many retirees reject Roth conversion strategies or other tax-planning opportunities solely because they might temporarily increase Medicare premiums. In some cases, avoiding an IRMAA surcharge can ultimately result in paying significantly more in lifetime taxes.

• The better question isn't: "How can I avoid IRMAA this year?"
• Instead, ask: "How can I minimize the total taxes and costs my family is likely to pay over the course of retirement?"

Those are two very different objectives.

Think beyond this year's tax return

Traditional tax planning often centers on reducing this year's tax liability.

Lifetime tax planning takes a broader view by evaluating how today's decisions affect taxes, retirement income and wealth in the next 20 to 30 years.

That distinction matters because strategies that intentionally increase taxable income today — such as Roth conversions — can sometimes reduce taxes substantially later.

Depending on the circumstances, converting part of a traditional IRA to a Roth IRA could:

• Reduce future required minimum distributions (RMDs)
• Lower taxable income later in retirement
• Reduce the taxation of Social Security benefits
• Provide additional tax-free assets for future spending
• Improve tax flexibility throughout retirement
• Reduce taxes for a surviving spouse
• Leave heirs with more tax-efficient inheritances

None of those benefits can be evaluated by looking at only one tax year.

Focus on the right goal

Key takeaway: IRMAA is an important planning variable — but it should rarely outweigh a well-supported strategy that meaningfully reduces lifetime taxes.

Understanding the tax valley

Many retirees experience a period after they stop working but before claiming Social Security and before required minimum distributions begin.

During these years, taxable income might be temporarily lower than it will be later in retirement.

Financial planners often refer to this as a tax valley — a window that might present an opportunity to recognize income at relatively favorable tax rates.

Consider a hypothetical married couple, both age 63, with $2 million in traditional IRAs.

Because they recently retired, they temporarily find themselves in the 24% federal income tax bracket. Their retirement income plan projects substantially higher taxable income once Social Security benefits begin and required minimum distributions become mandatory.

Suppose they convert $150,000 per year to Roth IRAs over several years. The conversions increase their taxable income enough to trigger higher Medicare premiums through IRMAA.

At first glance, paying higher Medicare premiums seems undesirable.

However, those same Roth conversions might significantly reduce future required minimum distributions, lower future taxable income, reduce taxes for a surviving spouse, create greater tax flexibility later in retirement and leave heirs with more tax-efficient assets.

If a temporary Medicare surcharge of several thousand dollars helps reduce projected lifetime taxes by six figures, many retirees would likely consider that an attractive trade-off.

The numbers — not the premium increase alone — should drive the decision.

IRMAA is one variable — not the objective

Retirement planning requires balancing many competing financial factors:

• Federal income taxes
• State income taxes
• Social Security taxation
• Required minimum distributions
• Medicare premiums
• Estate planning
• Legacy goals

Each deserves consideration, but the mistake is allowing any one of those to dominate the entire planning process.

IRMAA should be viewed the same way investors evaluate transaction costs or capital gains taxes. It is a legitimate expense to consider — but not necessarily a reason to abandon an otherwise beneficial strategy.

Waiting can be expensive

Many retirees assume paying less tax today automatically leads to paying less tax overall.

Unfortunately, that assumption often proves incorrect.

Traditional IRAs continue growing tax deferred. Larger account balances frequently produce larger required minimum distributions, which could:

• Push retirees into higher tax brackets.
• Increase the taxable portion of Social Security benefits.
• Trigger higher Medicare premiums later in retirement.
• Increase tax burdens after the death of a spouse, when the surviving spouse begins filing as a single taxpayer.
• Leave beneficiaries inheriting taxable retirement accounts that generally must be distributed within 10 years under current law.

Ironically, retirees who spend years trying to avoid modest IRMAA surcharges today might pay larger Medicare surcharges later because their required minimum distributions have become substantially larger.

Every recommendation should begin with a projection

No two retirees have identical circumstances.

The appropriate Roth conversion strategy depends on numerous variables, including expected investment returns, future tax rates, longevity, charitable giving goals, pension income, state taxes, estate-planning objectives and anticipated spending needs.

For that reason, sophisticated retirement planning relies on long-term projections rather than general rules.

Stopping a Roth conversion because it crosses an IRMAA threshold might feel prudent, but without a lifetime analysis, it's impossible to know whether that decision improves a retiree's long-term financial outcome.

The goal isn't to win this year's tax return

The Internal Revenue Service calculates your taxes one year at a time — your retirement plan shouldn't.

The objective of retirement tax planning isn't minimizing taxes this year — nor is it minimizing Medicare premiums this year.

The objective is maximizing after-tax wealth throughout retirement while preserving flexibility for future spending, charitable giving and legacy planning.

Sometimes that means staying below an IRMAA threshold.

Other times, the math clearly supports accepting a temporary Medicare surcharge because doing so produces substantially larger long-term tax savings.

The answer depends on the analysis — not the acronym.

The Centers for Medicare & Medicaid Services (CMS) establishes IRMAA as an income-based adjustment to Medicare premiums, while IRS rules govern the taxation of Roth conversions in the year they occur.

Neither rule suggests retirees should automatically avoid Roth conversions because of a temporary increase in Medicare premiums. Instead, both reinforce the importance of evaluating tax decisions within the context of an overall retirement income strategy.

The most ideal retirement tax plans rarely optimize a single year — they optimize a lifetime.

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This article was written by and presents the views of our contributing adviser, not the Kiplinger editorial staff. You can check adviser records with the SEC or with FINRA.