What IRMAA Is and Why It Affects Your Medicare Costs

IRMAA stands for Income-Related Monthly Adjustment Amount. It is an extra charge added to your Medicare Part B (doctor visits) and Part D (prescription drugs) premiums if your income is above a certain threshold. The higher your income, the more you pay — sometimes significantly more than someone with lower income paying the standard premium.

IRMAA is not a separate program or a penalty for earning money. It is how Medicare adjusts your premium costs based on what you reported to the IRS two years ago. If you earned more in 2022, you may see IRMAA charges on your 2024 Medicare bill. This two-year lag is important because your income may have changed since then, but Medicare will not adjust your IRMAA until the following year.

The adjustment applies to individuals and married couples filing jointly. If you are married and file separately, IRMAA rules are stricter and you should speak with Medicare directly about your situation.

Key Takeaways

  • IRMAA is an extra monthly charge on your Medicare Part B and Part D premiums based on your income from two years prior.
  • Income thresholds change each year, and exceeding them triggers brackets that increase your premiums by $70 to over $300 per month depending on how much over the limit you are.
  • Medicare calculates IRMAA using your Modified Adjusted Gross Income (MAGI) from your tax return, which includes wages, interest, dividends, and some Social Security benefits.
  • You can request a review if your income dropped due to retirement, death of a spouse, or loss of income-producing property, and Medicare may adjust your IRMAA retroactively.
  • IRMAA affects only Part B and Part D premiums; it does not change your Part A (hospital) costs or out-of-pocket limits.

How Income Thresholds and Brackets Work

Medicare sets income thresholds each year. In 2024, for example, the thresholds begin at $103,000 for individuals and $206,000 for married couples filing jointly. These numbers change annually, usually increasing slightly. If your Modified Adjusted Gross Income (MAGI) falls at or below the threshold for your filing status, you pay the standard Part B and Part D premiums with no IRMAA adjustment.

Once you exceed the threshold, you move into one of several IRMAA brackets. Each bracket adds a specific amount to your Part B premium and a separate amount to your Part D premium. For 2024, someone just over the threshold might pay an extra $70 per month on Part B, while someone significantly over might pay $350 or more. The exact amount depends on how far above the threshold your income falls and which bracket you land in.

The brackets are wide — you do not jump to the highest tier just by exceeding the threshold by a small amount. However, the cumulative effect across both Part B and Part D can be substantial. A couple with significantly higher income may see combined IRMAA charges of $400 to $600 per month or more.

What Income Counts Toward IRMAA

Medicare uses your Modified Adjusted Gross Income (MAGI) from your federal tax return. MAGI includes wages, self-employment income, interest, dividends, capital gains, and rental income. It also includes a portion of your Social Security benefits — specifically, the amount of Social Security that you count as taxable income on your return.

Some income does not count toward IRMAA. Veterans' benefits, Supplemental Security Income (SSI), and certain types of tax-exempt interest are excluded. However, most retirement income — including distributions from IRAs, 401(k)s, and pensions — does count. If you took a large withdrawal from a retirement account in 2022, that withdrawal will increase your 2024 IRMAA even if you did not need the money.

This is why the two-year lag matters. You cannot control what you earned two years ago, but you can plan ahead. If you know you will have a large one-time income event (such as selling a home or taking a retirement account distribution), you may want to discuss the timing with a tax professional or financial advisor to understand the IRMAA impact.

When IRMAA Changes Take Effect

Medicare calculates your IRMAA based on your tax return from two years prior. Your 2024 IRMAA is based on your 2022 tax return. Your 2025 IRMAA will be based on your 2023 tax return. This means there is always a delay between when your income changes and when your Medicare premiums adjust.

If your income dropped significantly — for example, because you retired, your spouse died, or you lost income-producing property — you do not have to wait two years for relief. You can request a Life-Changing Event review from Medicare. If Medicare approves your request, they may adjust your IRMAA retroactively to the month you reported the change, and you may receive a refund of overpaid premiums.

Life-changing events that may have access to for a review include retirement, death of a spouse, divorce, loss of income-producing property, and loss of a pension or annuity. You must report the change within 60 days of when it happened. Medicare will ask for documentation — a retirement letter from your employer, a death certificate, a divorce decree, or a property loss statement.

How to Request an IRMAA Review

To request a review, contact Medicare directly at 1-800-MEDICARE (1-800-633-4227). You can also visit your local Social Security office if you receive Social Security benefits. Have your most recent tax return and documentation of the life-changing event ready when you call.

Medicare will ask you to complete a form called the Medicare Income-Related Monthly Adjustment Amount — Life-Changing Event form. You can request this form by phone, or you can read it from Medicare.gov. The form asks for your current income estimate and the reason for the change. Medicare typically responds within 30 days, though processing times vary.

If Medicare approves your request, your new IRMAA will take effect the month after they process your review. If you overpaid premiums in the months between when your income changed and when Medicare adjusted your IRMAA, you will receive a refund or a credit toward future premiums.

IRMAA and Your Overall Medicare Costs

IRMAA affects only your Part B and Part D premiums. It does not change your Part A premium (most people pay nothing for Part A if they or their spouse paid Medicare taxes for at least 10 years). It also does not change your deductibles, copayments, or coinsurance amounts — the out-of-pocket costs you pay when you actually use medical services.

However, IRMAA can significantly increase your total Medicare costs. If you are in a high IRMAA bracket, your monthly premium for Part B alone could be $350 or more, compared to the standard premium of around $175 for 2024. Over a year, that difference adds up. For someone with both Part B and Part D IRMAA charges, the annual impact can exceed $5,000.

This is why understanding IRMAA matters when you are planning for retirement. If you are considering when to retire, when to take Social Security, or when to withdraw from retirement accounts, the IRMAA impact is worth discussing with a financial advisor or tax professional. Small changes in timing can sometimes result in meaningful savings on Medicare premiums.

Planning Ahead to Reduce IRMAA

If you know your income will be high in a given year, you cannot avoid IRMAA for the two years that follow. However, you can plan to reduce income in future years. Some strategies people discuss with financial advisors include timing large withdrawals from retirement accounts, managing the sale of investments to spread capital gains over multiple years, or delaying Social Security to reduce your current income.

These strategies are personal and depend on your overall financial situation. What works for one person may not work for another. A financial advisor or tax professional can help you model different scenarios and understand the long-term impact of IRMAA on your retirement budget.

If you are already in a high IRMAA bracket and your income is unlikely to drop, focus on understanding your total Medicare costs and budgeting accordingly. IRMAA is not going away, but knowing exactly what you will pay each month helps you plan the rest of your retirement finances.

Frequently Asked Questions

Can I appeal my IRMAA if I think Medicare made a mistake?

Yes. If you believe Medicare used the wrong income figure or made a calculation error, you can request a review. Contact Medicare at 1-800-MEDICARE and explain the error. You will need to provide documentation, such as a corrected tax return or an amended return you filed with the IRS. Medicare will investigate and adjust your IRMAA if an error is found.

Does IRMAA explore if I am still working?

Yes. IRMAA is based on your income from your tax return, regardless of whether you are working or retired. If you are working and earning above the threshold, you will have IRMAA charges. This is one reason some people time their retirement carefully — to manage the income that will trigger IRMAA in future years.

What happens to IRMAA if my spouse dies?

Your IRMAA is based on your filing status and income. If your spouse dies, your filing status changes, and your income may drop. You should report your spouse's death to Medicare within 60 days. Medicare may adjust your IRMAA retroactively, and you may receive a refund of overpaid premiums. Contact 1-800-MEDICARE to report the change.

Can I reduce my IRMAA by reducing my income right now?

Not when ready. Your current IRMAA is based on income from two years ago, so reducing your income now will not affect your IRMAA until two years from now. However, if you have a may have access to life-changing event — such as retirement or loss of income-producing property — you can request a review and potentially lower your IRMAA sooner.

Is there a maximum IRMAA amount I will have to pay?

Yes. There is a highest IRMAA bracket, and once you reach it, your premiums do not increase further no matter how high your income goes. In 2024, the highest bracket applies to individuals with MAGI over $500,000 and married couples over $1,000,000. However, most people with IRMAA fall into lower brackets.