How Inherited IRA Withdrawals Can Trigger IRMAA Medicare Surcharges

When you inherit a traditional IRA from someone other than a spouse, the account comes with both an opportunity and a deadline. Most non-spouse beneficiaries must empty the account by the end of the tenth year after the original owner's death — and what you do with those years matters more than many people realize. One of the quieter risks is how the timing of your withdrawals can affect your Medicare premiums long after the money is gone.

The 10-year rule and what it actually requires

Under current rules stemming from the SECURE Act, most non-spouse inherited IRA beneficiaries are subject to the 10-year rule: the full balance must be withdrawn by December 31 of the tenth year following the account owner's death. A small group of "eligible designated beneficiaries" — surviving spouses, minor children of the deceased, disabled or chronically ill individuals, and those less than ten years younger than the decedent — still qualify for longer treatment. For most adult children inheriting from a parent, the ten-year window applies.

There is an important wrinkle that can apply depending on the decedent's situation: if the original account owner had already begun required minimum distributions (RMDs), the IRS's finalized rules generally require the beneficiary to also take minimum annual distributions during years 1 through 9, not just empty the account by year 10. The rules here are fact-specific, so confirming your obligations with a tax professional based on your actual circumstances is a worthwhile first step.

For more on the foundational rules that govern non-spouse inherited IRAs, see Inheriting an IRA: Rules Every Adult Child Should Know. If you inherited from a spouse instead, the rules are meaningfully different — see RMD Rules When Inheriting an IRA as a Spouse Explained.

The common mistake: deferring everything to the end

It is a reasonable instinct to want to "let it grow tax-deferred as long as possible." For decades, that logic worked well with the old stretch IRA, which let beneficiaries spread distributions across their own life expectancy. Under the 10-year rule, the math is different.

When a beneficiary defers all discretionary withdrawals and then takes a single large distribution at or near year 10, they concentrate what may be a decade of accumulated growth into one or two tax years. The result is a spike in taxable income that can have ripple effects well beyond the income tax bill — most notably, on Medicare premiums.

How IRMAA works and why a lump sum can trigger it

IRMAA stands for Income-Related Monthly Adjustment Amount. It is a surcharge on Medicare Part B and Part D premiums that applies when your modified adjusted gross income (MAGI) exceeds certain thresholds. The key mechanical features that make it particularly sensitive to a sudden income spike:

It is a cliff, not a slope. Each IRMAA tier is a hard cutoff. Going even one dollar over a threshold triggers the full surcharge for that tier for the entire year — not just on the income above the line.

It looks back two years. Medicare premiums for 2026 are based on your 2024 MAGI. A large inherited IRA withdrawal taken in 2024 would raise your 2026 premiums, even if your income has since returned to normal.

It applies per person. Each Medicare-enrolled spouse in a household can face their own surcharge independently.

Here are the 2026 IRMAA tiers for Medicare Part B, based on 2024 MAGI (Source: Centers for Medicare & Medicaid Services and Social Security Administration, 2026 Medicare Parts A & B Premiums and Deductibles fact sheet, as of July 2026):

A single year's large inherited IRA distribution can push MAGI into the upper tiers, resulting in significantly higher Medicare premiums roughly two years later. Once income normalizes in subsequent years, premiums typically return to the standard rate — but that does not recover the surcharges paid during the high-income year. (The Social Security Administration does offer a narrow appeal process via Form SSA-44 if a qualifying life-changing event — such as retirement or a loss of income — caused the spike, but this is not a substitute for proactive planning.)

How spreading withdrawals across multiple years may help

The planning idea is relatively straightforward: distributing the inherited IRA balance more evenly across the available years may help keep your annual MAGI lower and more level, which can make it easier to stay under an IRMAA threshold in any single year.

Rather than waiting for year 10 and absorbing one large taxable event, a beneficiary working with a tax professional might consider:

• Reviewing income each year. Lower-income years — for example, early in retirement before Social Security begins, or during a career transition — can be good times to take larger distributions.
• Filling brackets deliberately. Taking distributions up to (but not over) a tax bracket ceiling, or an IRMAA threshold, can spread the tax cost more evenly across the window.
• Looking at the full income picture. Inherited IRA withdrawals do not happen in isolation. Social Security income, RMDs from other retirement accounts, pension payments, and investment income all feed into MAGI. A withdrawal that looks modest on its own may combine with other income in ways that push MAGI over a threshold.
• Accounting for the two-year lag. Because IRMAA looks back two years, the distribution year is not the year you feel the Medicare premium impact. That delay is worth mapping into any multi-year plan.

None of this is a guarantee of any particular tax or Medicare-premium outcome. The right approach depends heavily on the individual's complete income picture, filing status, other retirement assets, and timing. These are coordination questions, not simple rules — which is exactly why they benefit from coordinated professional planning.

Why this kind of planning requires a coordinated team

An inherited IRA sits at the intersection of tax law, retirement income planning, Medicare timing, and estate considerations. Looking at any one of those in isolation can lead to decisions that look optimal from one angle while quietly creating costs in another.

This is the kind of coordination our team is designed to provide. As an independent RIA, Wealth Ease acts as a fiduciary — meaning we are committed to acting in your interest across your full financial picture, not just one account. Our team includes CFP®, AIF®, and CPA professionals who look at how an inherited account fits alongside your tax situation, your Medicare timing, your other income sources, and your longer-term plan.

We work with clients navigating life transitions, including those who have recently inherited assets and need to understand their options clearly before acting. If you are managing an inherited IRA — or expect to be — the earlier a plan is in place, the more years are available to work with.

Reach out to our team to talk through what a withdrawal strategy might look like for your situation.

This article is educational and is not personalized investment, tax, or legal advice. Tax rules related to inherited IRAs are complex and fact-specific; your obligations depend on your relationship to the original account owner, the decedent's RMD status, and other individual factors. Consult a qualified tax professional about your specific circumstances. Wealth Ease Wealth Management is a registered investment adviser.

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