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Understanding Medicare Part B and IRMAA Basics

Medicare Part B covers doctor visits, outpatient care, medical equipment, and preventive services for people 65 and older, as well as some younger people with disabilities or end-stage renal disease. Most people pay a monthly premium for Part B coverage. In 2024, the standard Part B premium is $164.90 per month, though some people pay more based on their income.

IRMAA stands for Income-Related Monthly Adjustment Amount. This is an extra charge added to your Part B premium when your income exceeds certain thresholds. The Social Security Administration uses your modified adjusted gross income (MAGI) from two years prior to determine whether you owe an IRMAA surcharge. For example, when calculating 2024 IRMAA amounts, Social Security looks at your 2022 tax return.

The income brackets that trigger IRMAA change each year. For 2024, single filers with MAGI above $97,000 and married couples filing jointly with MAGI above $194,000 face IRMAA surcharges. These surcharges can range from $69.90 to $560.50 per month for Part B alone. Part D prescription drug coverage also has its own IRMAA surcharges.

Not everyone pays IRMAA. Approximately 7 to 8 million Medicare beneficiaries pay income-related premiums out of roughly 67 million total Medicare beneficiaries, meaning roughly 10-12% of Medicare users are affected by these additional charges. However, the number of people paying IRMAA has grown steadily over the past decade as more people reach the income thresholds.

Practical takeaway: Understanding that IRMAA is an income-based surcharge, not a penalty, helps you recognize why your Part B premium may differ from the standard amount listed in Medicare materials.

How IRMAA Thresholds Work and Income Calculations

Social Security determines IRMAA by comparing your modified adjusted gross income (MAGI) against yearly thresholds. Your MAGI includes your adjusted gross income plus tax-exempt interest income. The thresholds are set at specific dollar amounts, and anyone above these amounts pays additional premiums in tiers based on how far their income exceeds the threshold.

For 2024, the IRMAA brackets for Part B are: $97,000 to $121,000 (single) or $194,000 to $242,000 (married filing jointly) results in a $69.90 monthly surcharge; $121,001 to $145,000 (single) or $242,001 to $290,000 (married) results in a $174.70 surcharge; and income continues to tier upward to a maximum surcharge of $560.50 for individuals earning above $500,000 or married couples earning above $1,000,000.

The two-year lookback period can work in your favor during major life changes. If you had higher income in 2022 but retired or experienced a significant income reduction by 2024, you may still face 2024 IRMAA based on 2022 income. However, Social Security has a process called a "Life-Changing Event" that may allow you to request an exception if your income has dropped significantly due to retirement, death of a spouse, loss of income-producing property, or other specific circumstances.

Tax-exempt interest income counts toward your MAGI, even though you don't pay income tax on it. This includes interest from municipal bonds, Treasury securities that are exempt from state taxes, and certain other sources. Distributions from Roth IRAs don't count toward MAGI, but distributions from traditional IRAs, 401(k)s, and other pre-tax retirement accounts do count as income for IRMAA purposes.

Practical takeaway: Request your Social Security earnings statement to see what income amount Social Security has on record for you, since this is the number they use to calculate your IRMAA. You can verify this matches your actual tax return from two years prior.

Requesting a Refund or Reduction for Part B IRMAA

Social Security allows Medicare beneficiaries to request relief from IRMAA if their current year income is substantially lower than the prior-year income used to calculate their premium. This is called an IRMAA appeal or exception request. Common reasons include retirement, loss of income-producing property, receipt of a one-time payment (like an inheritance), or death of a spouse.

To request an exception, you contact Social Security directly, not Medicare. You can call Social Security at 1-800-772-1213 (TTY 1-800-325-0778) during business hours, visit your local Social Security office, or call the Medicare Part B premium inquiry line. You'll need to provide documentation showing your current year income estimate is substantially lower than what Social Security has on file.

Acceptable documentation includes recent pay stubs, a letter from your employer confirming a job loss or reduced hours, bank statements showing cessation of investment income, or a recent tax return. Social Security looks at whether your income decline is permanent or temporary. A temporary reduction due to between-job status may not result in relief, while retirement or loss of a major income source usually does.

If Social Security approves your exception request, they can reduce or eliminate your IRMAA surcharge for that year and sometimes the following year as well. This could mean lowering your Part B premium back to the standard amount, saving you between $70 and $560 per month depending on your income tier. Some people receive refunds of excess premiums they paid at the higher IRMAA rate.

The time needed to process an exception request varies, but Social Security typically responds within 30 to 60 days. During the appeal process, you're expected to continue paying your current IRMAA amount. If your request is approved, any overpayment is refunded to you, usually within 2 to 4 weeks after Social Security makes their decision.

Practical takeaway: If you've recently retired or experienced a significant income drop, request an IRMAA exception even if you think you might not qualify—Social Security makes the determination based on specific rules, and you have nothing to lose by submitting documentation of your income change.

Special Circumstances That May Reduce Your IRMAA

Social Security recognizes specific life events that justify reducing IRMAA even if your two-year-old income appears high. These "Life-Changing Events" include: retirement (ending your employment), loss of income-producing property, loss of pension income, death of a spouse, divorce or annulment, and receipt of a settlement from a legal judgment or settlement agreement related to job loss or business closure.

Retirement is the most common qualifying event. If you were working and earning a high income in 2022, but retired in 2023 or 2024, Social Security can adjust your IRMAA based on your new, lower retirement income. You'll need to provide documentation like a letter from your employer stating your retirement date, your last pay stub showing your final paycheck, or a Social Security statement showing your benefit amount.

Loss of a spouse affects IRMAA in two ways. First, if your spouse dies, your income threshold for IRMAA changes from the "married filing jointly" amount to the "single" amount, which is roughly half. This means you could move into a lower income tier. Second, if your household income decreases because your spouse's income is no longer part of the calculation, you may qualify for a reduction. You'll need a death certificate and proof of when the death occurred.

Divorce or legal separation also changes your filing status for IRMAA purposes. Going from "married filing jointly" to "single" typically reduces your income threshold. If your ex-spouse had substantial income that was counted in the "married" calculation, your MAGI may now fall below the threshold that triggered your IRMAA. You'll need a copy of your divorce decree or legal separation agreement.

One-time events like inheritances or legal settlements can trigger an exception request. If you received a large inheritance that artificially boosted your 2022 income above the IRMAA threshold, but this was a one-time payment unlikely to recur, Social Security may reduce your IRMAA. Similarly, if you received a settlement from a lawsuit related to job loss, this may qualify as a temporary increase that shouldn't affect