What IRMAA Is and Why It Matters

IRMAA stands for Income-Related Monthly Adjustment Amount, and it is an extra charge added to your Medicare Part B and Part D premiums if your income is above a certain level. It is not a separate program — it is an adjustment to what you already pay for Medicare coverage. The higher your income, the higher your IRMAA charge, and it can add anywhere from roughly $70 to over $500 per month to your premiums, depending on your income bracket and the year.

IRMAA uses your tax return from two years before the current year to calculate your income. So in 2024, Medicare looks at your 2022 tax return. This two-year lag matters because it means a major life change — like retirement or a drop in investment income — may not show up in your IRMAA calculation right away. Understanding how IRMAA works helps you plan for the real cost of Medicare and know when you can request an adjustment if your situation changes.

Key Takeaways

  • IRMAA is an extra monthly charge on your Part B and Part D premiums based on your income from two years prior, not your current income.
  • Income thresholds change each year; in 2024, single filers with income above $103,000 and married couples filing jointly above $206,000 begin paying IRMAA.
  • If your income drops due to retirement, divorce, or death of a spouse, you can request a Life-Changing Event adjustment without waiting two years.
  • IRMAA brackets have multiple tiers, so your adjustment amount increases as your income rises, not all at once.
  • You receive a notice each year showing your IRMAA amount; you have the right to appeal or request a recalculation if the income figure is wrong.

How Income Thresholds and Brackets Work

Medicare sets income thresholds each year, and they vary by filing status. For 2024, the thresholds start at $103,000 for single filers and $206,000 for married couples filing jointly. If your income falls below these amounts, you pay the standard Part B and Part D premiums with no IRMAA adjustment. Once you cross the threshold, your premiums rise in steps.

The brackets are not all-or-nothing. If you earn $110,000 as a single filer, you do not jump into the highest bracket — you pay IRMAA based on which bracket your income falls into. In 2024, there are five income brackets for IRMAA, each with its own monthly surcharge. The surcharge increases as your income rises, so someone earning $150,000 pays more than someone earning $110,000, but not the maximum amount. These thresholds and bracket amounts change annually, so the numbers you see this year will differ next year.

Which Income Counts Toward IRMAA

IRMAA uses your Modified Adjusted Gross Income (MAGI), which is your adjusted gross income plus certain tax-exempt income. For most people, MAGI is the same as the adjusted gross income on your tax return. But it also includes tax-exempt interest, half of your Social Security benefits, and foreign earned income if you have any of those sources.

This means that even if you do not owe federal income tax, you can still have IRMAA applied if your total income — including Social Security and tax-exempt interest — crosses the threshold. Pensions, rental income, investment gains, and retirement account withdrawals all count. If you are married filing jointly, Medicare adds both spouses' incomes together, even if only one of you is on Medicare.

When IRMAA Changes and How to Request an Adjustment

Your IRMAA is recalculated each year based on your prior-year tax return. Most people receive a notice in the mail showing their new IRMAA amount for the upcoming year. However, if a major life event happens — such as retirement, divorce, death of a spouse, or a significant drop in income — you do not have to wait two years for the adjustment to take effect. You can request a Life-Changing Event adjustment right away.

To request an adjustment, contact Social Security at 1-800-772-1213 or visit your local Social Security office. You will need to provide proof of the event: a retirement letter, divorce decree, death certificate, or documentation of the income change. Social Security will review your request and may recalculate your IRMAA using your current-year income instead of the prior-year figure. This process usually takes a few weeks, and if approved, your new premium amount takes effect the following month.

How to Appeal an IRMAA Notice

If you receive an IRMAA notice and believe the income figure is wrong, you have the right to appeal. This can happen if your tax return was amended, if you reported income that should not have been counted, or if there was a clerical error. You have 60 days from the date on the notice to request an appeal.

To appeal, call Social Security at 1-800-772-1213 and ask to speak with a representative about your IRMAA notice. Have your tax return and any supporting documents ready. If Social Security agrees that the income was reported incorrectly, they will recalculate your IRMAA. If you disagree with their decision, you can request a hearing before an administrative law judge, though this process takes longer.

Strategies to Manage IRMAA

While you cannot avoid IRMAA if your income is high, some people look for ways to manage it. One common approach is timing large income events. Since IRMAA uses income from two years prior, a major withdrawal or sale planned for this year will not affect your IRMAA until two years from now. This means you have time to plan around it if possible.

Another consideration is the source of income. Roth conversions, for example, increase your taxable income in the year of the conversion, which will show up in your IRMAA calculation two years later. Some people work with a tax professional to understand how different income sources affect their IRMAA and plan accordingly. However, these strategies are complex and depend on your full financial picture — a tax advisor or financial planner familiar with Medicare can help you think through your specific situation.

IRMAA for Part B and Part D

IRMAA applies to both Part B (medical insurance) and Part D (prescription drug coverage). Your Part B premium increases based on your IRMAA bracket, and your Part D premium also increases. Some people pay IRMAA on both; others may have only Part D coverage and pay IRMAA only on that. If you have a Medigap or Medicare Advantage plan, IRMAA does not explore to those premiums — only to the underlying Part B and Part D costs.

If you drop Part D coverage and go without prescription drug insurance for more than 63 days in a row, you may face a permanent late enrollment penalty when you do sign up. This penalty is separate from IRMAA and is calculated based on how long you went without coverage. Understanding both IRMAA and late enrollment penalties helps you make informed choices about which coverage to keep.

Frequently Asked Questions

Does IRMAA explore to Medicare Advantage plans?

No. IRMAA applies only to your Part B and Part D premiums. If you have a Medicare Advantage plan, you still pay Part B IRMAA, but the Advantage plan premium itself is not subject to IRMAA. However, you should check your plan documents, as some plans may have other income-based adjustments.

What happens to IRMAA if I go back to work after retirement?

Your IRMAA will not change when ready because it is based on your prior-year tax return. However, when your new income shows up on your tax return two years later, your IRMAA will increase. If the increase is significant, you may be able to request a Life-Changing Event adjustment sooner, though going back to work is not typically considered a may have access to event — only major decreases in income usually may have access to.

Can I reduce my IRMAA by lowering my income?

Not in the short term, because IRMAA uses prior-year income. However, if you have a genuine life change — such as retirement or a job loss — you can request an adjustment. Some people also explore tax-planning strategies with a professional, but these are complex and not suitable for everyone. The key is understanding that IRMAA is based on past income, not current income, so changes you make now will not affect your IRMAA for two years.

What if I disagree with the income amount on my IRMAA notice?

Call Social Security at 1-800-772-1213 within 60 days of receiving the notice and explain the discrepancy. Bring your tax return and any documents that support your claim. If Social Security agrees the income was wrong, they will recalculate your IRMAA. If you disagree with their decision, you can request a hearing.

Does IRMAA explore to my spouse if only I am on Medicare?

No, IRMAA is calculated based on the income of the person enrolled in Medicare. However, if you are married filing jointly, both spouses' incomes are combined for the IRMAA calculation. So your spouse's income counts toward your IRMAA, even if your spouse is not on Medicare.