Your Part B Premium Depends on Your Income From Two Years Ago

Medicare Part B premiums are not the same for everyone. The amount you pay each month depends on your Modified Adjusted Gross Income (MAGI) from two years before the year you are enrolled. If you are enrolling in 2024, Medicare looks at your 2022 tax return. This is called Income-Related Monthly Adjustment Amount (IRMAA), and it means higher earners pay more than the standard premium.

The standard Part B premium in 2024 is $164.90 per month, but you may pay anywhere from that amount up to $560.50 per month depending on your income bracket. The income thresholds change each year, and they are different for people who are single, married filing jointly, married filing separately, and head of household.

If your income drops significantly — because you retire, lose a job, or have a major life change — you can request that Medicare recalculate your premium using your current year income instead. This is called a Life-Changing Event, and you have 60 days from the event to report it.

Key Takeaways

  • Medicare uses your income from two years prior to set your Part B premium, so 2024 premiums are based on 2022 income.
  • Higher income means higher premiums through IRMAA brackets that range from the standard rate up to $560.50 per month in 2024.
  • If your income drops due to retirement, job loss, or divorce, you can report a Life-Changing Event within 60 days to have your premium recalculated.
  • You report income changes to Social Security, not to Medicare directly, and the change takes effect the month after Social Security processes it.
  • Your Part B premium is deducted from your Social Security check each month, or you receive a bill if you do not receive Social Security.

The Income Brackets That Determine Your Premium Amount

Medicare divides enrollees into five income tiers, each with its own premium. In 2024, the brackets are based on your MAGI from your 2022 tax return. For a single person, the brackets start at $103,000 and go up to $500,000 or more. For married couples filing jointly, they start at $206,000 and go up to $750,000 or more.

The standard premium covers the base cost of Part B. Each higher bracket adds a surcharge on top of that standard amount. Someone in the highest income bracket pays roughly three times the standard premium. These surcharges are recalculated every year based on the previous year's income data and the cost of Part B for the coming year.

Your MAGI includes your adjusted gross income plus tax-exempt interest income. If you are married filing separately, the rules are stricter and the income thresholds are much lower — starting at just $103,000 combined income. This can result in very high premiums for married couples who file separately.

Why Medicare Looks Back Two Years Instead of Using Current Income

Medicare uses a two-year lookback period because it needs time to process income data from tax returns. The Social Security Administration receives tax information from the IRS, matches it to Medicare enrollees, and calculates premiums based on that data. This process takes months, so by the time your premium is set, the income year is already two years in the past.

This system protects most people most of the time — your income is usually stable from year to year. But it creates a problem for people whose income drops suddenly. If you retire mid-year, lose a job, or have a major life event, your current income may be much lower than what Medicare is charging you for, even though you are paying based on last year's higher income.

That is why the Life-Changing Event process exists. If you experience a may have access to event, you can ask Social Security to use your current year income instead of waiting two years for the lookback to catch up.

Life-Changing Events That Let You Request a Premium Recalculation

A Life-Changing Event is a significant change in your life that reduces your income. The most common may have access to events are retirement, loss of employment, loss of income-producing property, death of a spouse, divorce or annulment, and reduction in pension or annuity payments. You must report the event within 60 days of when it happens.

To report a Life-Changing Event, contact Social Security at 1-800-772-1213 or visit your local Social Security office in person. You will need to provide documentation of the event — a termination letter from your employer, a divorce decree, a death certificate, or a letter from your pension provider showing the reduction. Social Security will ask you to estimate your income for the current year.

Once Social Security processes your request, your new premium takes effect the following month. You will receive a notice in the mail showing your new premium amount. If you overpaid based on the old premium, Social Security will refund the difference or credit it toward future premiums.

How Your Premium Is Collected Each Month

If you receive Social Security benefits, your Part B premium is deducted automatically from your monthly check. You see the deduction on your Social Security statement each month. If you do not receive Social Security, Medicare sends you a bill quarterly for your Part B premium, and you pay it directly to the government.

Your premium is set for the calendar year, so it stays the same from January through December unless you report a Life-Changing Event. In December, you will receive a notice showing your premium for the following year. If your income has changed and you think your premium is wrong, that is the time to contact Social Security and request a recalculation.

If you cannot afford your Part B premium, you may be able to get help through Medicaid or the Medicare Savings Program, depending on your state and income level. These programs can pay your Part B premium for you if you meet their income and asset limits.

What Happens If Your Income Changes Mid-Year

If your income drops during the year — because you retire, lose a job, or experience another may have access to event — you do not have to wait until the next year to adjust your premium. You can report the change to Social Security within 60 days, and they will recalculate your premium based on your estimated income for the current year.

The key word is "estimated." Social Security will ask you to project what your income will be for the full year. If you retire in June, you estimate your income for January through December of that year, not just June through December. This estimate should be reasonable and based on actual circumstances, not a guess.

If your estimate turns out to be wrong — if you earn more than you projected — Social Security may adjust your premium again the following year when they see your actual tax return. If you earn less, you will not owe anything back. The system is designed to prevent you from overpaying when your circumstances change.

Income Sources That Count Toward Your MAGI

Your MAGI includes wages, self-employment income, interest, dividends, capital gains, rental income, Social Security benefits, pensions, and annuities. It also includes tax-exempt interest from municipal bonds, which many people do not realize counts toward the MAGI calculation. Distributions from traditional IRAs and 401(k)s count as income in the year you withdraw them.

Some income does not count. Supplemental Security Income (SSI) does not count. Gifts do not count. Proceeds from selling your home do not count, though capital gains on the sale do. If you are married filing jointly, both spouses' income is combined for the MAGI calculation, even if only one of you is enrolled in Medicare.

If you have substantial investment income or are selling assets, be aware that these will affect your Part B premium two years later. Some people time large withdrawals or sales to minimize the impact on their Medicare costs, though this requires careful planning with a tax professional.

Frequently Asked Questions

Can I appeal my Part B premium if I think it is wrong?

Yes. If you believe Medicare used the wrong income information, you can request a reconsideration from Social Security. You have 60 days from the date on your premium notice to file an appeal. You will need to provide documentation of your actual income, such as a tax return or a letter from your employer.

What if I am newly retired and my income dropped but Medicare is still charging me the old premium?

Contact Social Security within 60 days of your retirement date and report it as a Life-Changing Event. Bring your termination letter or retirement paperwork and estimate your income for the current year. Social Security will recalculate your premium based on your new income.

Does my spouse's income affect my Part B premium if we file taxes separately?

Yes. Even if you file taxes separately, Social Security combines both spouses' income for the MAGI calculation. This is one reason married couples filing separately often face very high Part B premiums. You may want to consult a tax professional about whether filing jointly would lower your Medicare costs.

If I have a large capital gain one year, will my Part B premium go up for two years?

Yes. Capital gains count as income in the year you realize them, so a large sale will increase your MAGI for that year. Your Part B premium will be higher two years later when Medicare processes that tax return. If the gain was a one-time event, you can request a recalculation after the year ends if your income drops back down.

What is the difference between Part B premium and Part B deductible?

The premium is the monthly fee you pay to have Part B coverage, regardless of whether you use it. The deductible is the amount you have to pay out of your own pocket before Part B starts covering your doctor visits and tests. They are separate costs.