Understanding IRMAA: How a High-Income Year Can Raise Your Medicare Premiums

If your Medicare premium jumped and you are not sure why, a high-income year in the recent past may be the cause. The Income-Related Monthly Adjustment Amount, known as IRMAA, is a surcharge added to standard Medicare Part B and Part D premiums when a retiree's income exceeds certain thresholds. It catches many retirees off guard because it is based on income from two years prior, not the current year.

This timing gap is what makes IRMAA confusing. A retiree who sold a business, took a large capital gain, or converted a portion of a traditional IRA to a Roth IRA two years ago may not connect that event to a higher Medicare bill arriving today. Understanding how the lookback works, what counts as income, and what options exist to manage or appeal the surcharge can help you plan ahead rather than react after the fact.

• IRMAA is a surcharge on top of standard Medicare Part B and Part D premiums, not a separate program.
• It is based on your Modified Adjusted Gross Income (MAGI) from two years prior, a structure often called the "lookback."
• The surcharge is tiered. Income above certain thresholds moves you into progressively higher surcharge brackets.
• One-time income events, such as a Roth conversion, asset sale, or large capital gain, can temporarily push you into IRMAA territory.
• A life-changing event, like retirement or divorce, may qualify you to appeal IRMAA using Form SSA-44.

IRMAA stands for Income-Related Monthly Adjustment Amount. Medicare Part B (medical insurance) and Part D (prescription drug coverage) have standard monthly premiums that most beneficiaries pay. IRMAA adds an additional amount on top of those standard premiums for beneficiaries whose income exceeds certain levels.

The surcharge structure is tiered: as income rises above the base threshold, beneficiaries move into higher brackets, each carrying a larger add-on to both Part B and Part D premiums. Because the Social Security Administration administers IRMAA determinations, it is worth confirming the current-year dollar thresholds and surcharge amounts directly with the agency, since these figures are adjusted periodically and we do not want to quote a number that may already be outdated by the time you read this.

The part that surprises most retirees is timing. IRMAA for a given year is based on your tax return from two years earlier. In other words, your Medicare premium this year is influenced by what you earned, two years ago, not last year and not this year.

This lookback exists because tax return data takes time to process and become available to Medicare. The practical effect is that a single unusual income year, even one that will never repeat, can raise your premiums for a full year down the road.

IRMAA uses Modified Adjusted Gross Income (MAGI), which is broader than take-home pay. It generally includes:

• Wages, self-employment income, and business income
• Interest, dividends, and capital gains
• Taxable IRA and retirement plan distributions
• The taxable portion of Social Security benefits
• Tax-exempt interest, which is added back for this calculation

Because capital gains and retirement account withdrawals count, decisions that feel purely investment-related, selling a concentrated stock position, taking a larger-than-usual IRA distribution, or converting funds to a Roth IRA, can all move MAGI higher and potentially trigger or increase an IRMAA surcharge two years later.

Plan the timing of Roth conversions. Because a Roth conversion adds to taxable income in the year it occurs, converting a large amount in a single year can push MAGI into a higher IRMAA bracket two years out. Spreading conversions across multiple years, or coordinating conversion amounts with where you sit relative to IRMAA thresholds, may help manage the surcharge exposure. This is a case where investment strategy and tax strategy need to be looked at together, not in isolation.

Consider qualified charitable distributions (QCDs). For IRA owners of the applicable age, directing distributions straight to a qualified charity can satisfy charitable giving goals while keeping that amount out of MAGI, compared with taking the distribution as taxable income and then donating separately. Confirm current eligibility rules and limits with your tax professional before using this strategy.

Appeal through Form SSA-44 after a life-changing event. If your income two years ago was unusually high but has since dropped due to a qualifying life-changing event, retirement, reduced work hours, marriage, divorce, or the death of a spouse, you may be able to request a reduction in your IRMAA determination. The Social Security Administration's Medicare premium adjustment page describes this process. If you believe you qualify, confirm the current filing details, required documentation, and deadlines directly with the Social Security Administration or your advisor before submitting anything.

• Assuming this year's Medicare premium reflects this year's income, rather than income from two years ago.
• Converting a large lump sum to a Roth IRA without checking where that pushes you relative to IRMAA brackets.
• Not appealing after a legitimate life-changing event, simply because the original IRMAA notice looked final.
• Treating IRMAA as strictly a Medicare issue rather than a retirement income and tax planning issue.

Every family's income picture, tax situation, and Medicare timeline is different, and IRMAA decisions rarely stand alone. They intersect with Roth conversion planning, required minimum distributions, charitable giving, and the sale of a business or concentrated asset. In our experience, the biggest missed opportunities happen when these pieces are planned separately instead of together. If a high-income year is on the horizon, or if you have already received an IRMAA surcharge notice and are not sure whether it can be appealed, it may help to schedule a call with us to look at your income timeline as a whole.

Does IRMAA apply to everyone on Medicare? No. It only applies to beneficiaries whose MAGI from two years prior exceeds the applicable threshold for their filing status.

Is IRMAA a one-time charge or ongoing? It is reassessed annually based on the applicable prior-year tax return, so it can change from year to year depending on your income.

Can a single Roth conversion trigger IRMAA? Yes, if the conversion is large enough to push your MAGI above a threshold for that tax year, it can result in an IRMAA surcharge two years later.

What if my income was unusually high two years ago but has since gone down? You may be able to request a reduction using Form SSA-44 if the drop is tied to a qualifying life-changing event. Confirm eligibility and process directly with the Social Security Administration.

Does IRMAA affect Part A (hospital insurance)? IRMAA applies to Part B and Part D premiums, not Part A, which most beneficiaries do not pay a premium for.

Do qualified charitable distributions help avoid IRMAA? They may help by keeping the distributed amount out of MAGI, but eligibility rules apply. Confirm details with your tax professional.

Is IRMAA the same for everyone in a given income bracket? Surcharge amounts are tiered by income bracket and filing status, so amounts can differ. Confirm current figures with the Social Security Administration.

Can I plan around IRMAA before I retire? Yes. Because IRMAA is based on income from two years earlier, income and conversion timing decisions made well before Medicare enrollment can influence future premiums.

Where can I find the current-year IRMAA thresholds? The Social Security Administration publishes current premium and threshold information, which is worth checking each year since figures are periodically adjusted.

Who administers IRMAA determinations? The Social Security Administration determines IRMAA based on tax return data, while Medicare applies the resulting premium adjustment.

• Social Security Administration, Medicare Premium Adjustment (IRMAA)