What MAGI Means for Your Medicare Costs
Modified Adjusted Gross Income (MAGI) is the income figure Medicare uses to decide how much you pay for Part B (doctor visits) and Part D (prescription drugs). It is not the same as the income number on your tax return. Medicare calculates MAGI by taking your Adjusted Gross Income from your taxes and adding back certain types of income that the IRS excludes — mainly tax-exempt interest from municipal bonds.
Why this matters: if your MAGI crosses certain thresholds, your monthly premiums jump significantly. A single person earning $91,000 in 2024 pays the standard Part B premium. At $91,001, the premium increases. At higher income levels, it increases again. These thresholds change each year, and they affect millions of Medicare beneficiaries.
Medicare sends you a letter each year showing the MAGI they calculated and the premium tier you fall into. If you believe the income figure is wrong — because you had a major life change like retirement, a spouse's death, or a business sale — you can request a review and potentially lower your premiums retroactively.
Key Takeaways
- MAGI is calculated by adding tax-exempt interest back to your Adjusted Gross Income, and it determines your Part B and Part D premium amounts.
- Income thresholds that trigger higher premiums change yearly; in 2024, single filers see increases starting at $91,000 and continuing at higher brackets.
- If your income drops due to retirement, job loss, or a spouse's death, you can request a Life-Changing Event review to lower your premiums for that year and possibly the next.
- Medicare uses your tax return from two years prior to set current-year premiums, so 2024 premiums are based on 2022 income.
- Married couples filing jointly have higher thresholds than single filers, and each spouse's income counts toward the household total.
How Medicare Calculates Your MAGI
Start with your Adjusted Gross Income (AGI) from your federal tax return — the number on line 11 of Form 1040. Then add back any tax-exempt interest you received, usually from municipal bonds or bond funds. That sum is your MAGI for Medicare purposes.
Most people's MAGI is the same as their AGI because they have little or no tax-exempt interest. But if you own municipal bonds or bond mutual funds, the interest they generate counts toward MAGI even though it does not count on your taxes. This is the main reason someone's Medicare MAGI can be higher than they expect.
Medicare uses your tax return from two years before the current year. So in 2024, Medicare looks at your 2022 tax return to set your 2024 premiums. This two-year lag means your premiums do not when ready reflect a recent income drop — but it also means you can request an adjustment if your circumstances have changed.
Income Thresholds and Premium Tiers for 2024
Medicare divides beneficiaries into income brackets. Each bracket has its own Part B and Part D premium amounts. The standard Part B premium applies to people below the first threshold. Above that, premiums increase in steps.
For 2024, the thresholds are:
| Filing Status | Income Range | Part B Premium Increase |
|---|---|---|
| Single | $91,000 or less | Standard premium (no increase) |
| Single | $91,001–$114,000 | +$70 per month |
| Single | $114,001–$142,000 | +$175 per month |
| Single | $142,001–$170,000 | +$280 per month |
| Single | Over $170,000 | +$385 per month |
| Married filing jointly | $182,000 or less | Standard premium (no increase) |
| Married filing jointly | $182,001–$228,000 | +$70 per month |
| Married filing jointly | Over $228,000 | Increases continue in steps |
Part D (prescription drug) premiums follow a similar structure with their own thresholds. The exact amounts vary by plan, but the income brackets are the same. These thresholds increase slightly each year to account for inflation.
When Your Life Changes and MAGI No Longer Fits
If you retire, lose a job, sell a business, or experience another major income drop, your MAGI from two years ago may no longer reflect your current situation. Medicare allows you to request a review based on a Life-Changing Event.
may have access to events include retirement, loss of income-producing property, loss of a pension, death of a spouse, divorce, or a significant drop in business income. You must request the review within 60 days of the event. If approved, Medicare can lower your premiums for the current year and sometimes the following year as well.
To request a review, contact Social Security at 1-800-772-1213 or visit your local Social Security office with proof of the event — a retirement letter, a death certificate, a divorce decree, or a notice of job loss. Social Security handles the request on Medicare's behalf. The process typically takes four to six weeks.
What Counts as Income and What Does Not
For MAGI purposes, income includes wages, self-employment income, interest, dividends, capital gains, rental income, and Social Security benefits (if you file a joint return with a spouse). It also includes distributions from retirement accounts like IRAs and 401(k)s, whether or not you needed the money.
Tax-exempt interest from municipal bonds and bond funds counts toward MAGI even though it does not count on your taxes. This surprises many people. If you have a significant amount in municipal bonds, your MAGI can be substantially higher than your taxable income.
Some income does not count: Supplemental Security Income (SSI), certain veterans' benefits, and workers' compensation do not factor into MAGI. Roth conversion income counts, as do distributions from inherited IRAs. If you are unsure whether a particular income source counts, ask your tax preparer or contact Social Security.
Understanding Your Medicare Notice of Premium Adjustment
Each year, Medicare sends you an Initial Enrollment Notice or a notice of premium changes. This letter shows the MAGI Medicare calculated, the income bracket you fall into, and your Part B and Part D premiums for the coming year.
Read this notice carefully. If the MAGI amount is wrong — for example, if it includes income you no longer receive — you have the right to dispute it. You have 60 days from the date of the notice to request a review. Include documentation of the error: a corrected tax return, a letter from your employer, or proof of the life-changing event.
If you do not request a review within 60 days, you can still appeal later, but the process becomes more complicated. It is easier to act quickly when you receive the notice.
Strategies to Manage MAGI and Premiums
If your MAGI is close to a threshold and you are concerned about higher premiums, talk to a tax professional or financial advisor about your options. Some strategies people explore include timing charitable donations, managing retirement account withdrawals, or reviewing investment income.
Be cautious about making major financial decisions solely to lower MAGI. The premium increase may be smaller than the cost of restructuring your finances. A tax professional can help you understand the trade-offs.
If you have limited income and your premiums are a hardship, you may be able to get help through the Part D Low-Income Subsidy or Medicare Savings Programs run by your state. These programs have their own income limits, which are usually higher than the MAGI thresholds. Contact your state Medicaid office or call 1-800-MEDICARE to learn whether you may be may be able to access.
Frequently Asked Questions
Why does Medicare use income from two years ago?
Medicare needs time to process millions of enrollments and set premiums before the year begins. Using the prior year's tax return — which is filed and finalized — gives them a stable, verified income figure. This lag works in your favor if your income recently dropped, because you can request an adjustment.
Does my spouse's income count if we file separately?
If you are married and file separate tax returns, only your own income counts toward your MAGI. However, if you file jointly, both spouses' income is combined. This is one reason some married couples choose to file jointly for Medicare purposes even if they file separately for other reasons.
What if I disagree with the MAGI amount on my notice?
Contact Social Security within 60 days of receiving the notice. Provide documentation of the error — a corrected tax return, a letter from your employer, or proof of a life-changing event. Social Security will review your request and send you a new notice if the MAGI is adjusted.
Can I lower my premiums by not claiming certain income on my taxes?
No. Medicare uses your actual tax return, not what you report to them. If you underreport income on your taxes to lower Medicare premiums, you are committing tax fraud. Medicare and the IRS share information, and discrepancies are audited.
Do I have to pay higher premiums if my income is temporarily high?
If the high income was a one-time event — a business sale, an inheritance, or a large capital gain — you can request a Life-Changing Event review. Medicare may adjust your premiums if the event is unlikely to recur. Temporary spikes from retirement account withdrawals or bonus income are harder to adjust, so discuss your situation with Social Security.