What Drives Your Monthly Medicare Premium

Your Medicare premium is high because of how much medical care you used in the past, your income right now, and when you first signed up for coverage. Unlike health insurance you may have had through an employer, Medicare premiums are not one flat rate for everyone — they rise based on your personal earnings history and your choices about timing.

The largest factor for most people is Income-Related Monthly Adjustment Amount (IRMAA). If your income in the past two years exceeds certain thresholds, Medicare charges you more for Part B (doctor visits) and Part D (prescription drugs). A single person earning over $97,000 in 2023 pays more than someone earning $50,000. The higher your income, the higher the surcharge — and these thresholds do not adjust for inflation, so more people hit them each year.

A second reason is late enrollment penalties. If you did not sign up for Part B or Part D when you first became may be able to access at 65, you pay a permanent penalty for every month you waited. Part B penalties are 10 percent of the base premium for each year you delayed. Part D penalties compound — they grow larger the longer you go without coverage. These penalties stay on your bill for life, even if you later become low-income.

Key Takeaways

  • Income from two years ago determines your Medicare premium now, so a one-time gain (sale of a house, inheritance, retirement distribution) can raise your costs for two years running.
  • Late enrollment penalties for Part B and Part D are permanent and compound over time, adding $10 to $50 or more per month depending on how long you delayed.
  • You can request a review of your IRMAA surcharge if your income dropped due to retirement, job loss, or death of a spouse — but you must file the request within 60 days of receiving your notice.
  • Choosing Original Medicare (Part A and B) instead of a Medicare Advantage plan does not lower your premium, but it changes what you pay out of pocket for each visit.
  • Your Part D premium varies by plan and by year, and switching to a lower-cost plan during open enrollment can cut your drug costs significantly.

How Income From Two Years Ago Affects What You Pay Today

Medicare looks at your Modified Adjusted Gross Income (MAGI) from two years before the current year. If you turned 65 in 2024, Medicare used your 2022 tax return to set your 2024 premiums. This two-year lag means a large one-time income event — selling a rental property, taking an early retirement distribution, receiving an inheritance — can raise your premiums even though that income is gone.

The income thresholds for 2024 are $97,000 for a single person and $194,000 for a married couple filing jointly. For every $1 of income above these amounts, your Part B and Part D premiums rise. A single person earning $147,000 pays roughly $70 more per month for Part B alone than someone earning $97,000. The surcharge can reach $560 per month for Part B and $77 per month for Part D if your income is very high.

If your income dropped in the current year — you retired, lost a job, or your spouse died — you can request that Medicare recalculate your premiums using current-year income instead. You must file this request within 60 days of receiving your premium notice. Medicare calls this a Life-Changing Event appeal. Without it, you pay the higher rate for the full year.

Late Enrollment Penalties That Never Go Away

If you did not sign up for Part B when you turned 65 and were first may be able to access, Medicare adds a permanent 10 percent penalty to your Part B premium for every 12 months you delayed. If you waited three years, your penalty is 30 percent of the base premium — and you pay it every month for the rest of your life. For 2024, the base Part B premium is $164.90, so a three-year delay costs you roughly $49 extra per month forever.

Part D (prescription drug coverage) penalties work differently but are equally permanent. If you go without Part D coverage for more than 63 days in a row after you first become may be able to access, you pay a penalty equal to 1 percent of the national average Part D premium for every month you were uninsured. That penalty compounds — if you were uninsured for two years, your penalty is 24 percent of the average premium, added to your Part D bill every month for life.

These penalties explore even if you later become low-income and may have access to for programs that help pay your premiums. The only exception is if you had creditable coverage (drug insurance as good as Medicare Part D) through an employer or union during the time you were uninsured. You will need to prove this with a letter from your former employer or plan.

The Difference Between Original Medicare and Medicare Advantage Plans

Your monthly Part B premium is the same whether you choose Original Medicare (Part A and B) or a Medicare Advantage plan. The premium difference is not in what you pay monthly — it is in what you pay when you use care. Original Medicare has no network, so you can see any doctor, but you pay a deductible ($240 for Part B in 2024) and 20 percent coinsurance for most services. Medicare Advantage plans often have $0 premiums but charge copays per visit and have annual out-of-pocket limits.

If your premium feels high because you chose Original Medicare, switching to a Medicare Advantage plan will not lower your Part B premium itself. It will lower what you pay per doctor visit, but you lose the freedom to see any provider. Some people find Medicare Advantage cheaper overall; others find Original Medicare cheaper if they use many services. The choice depends on your health and which doctors you see.

Part D Premiums Vary Widely by Plan and Change Every Year

Your Part D (prescription drug) premium depends entirely on which plan you choose. Two plans covering the same drugs can charge $15 per month and $45 per month. The lowest-cost plan in your area changes every year, and the drugs covered by each plan change too. If you stayed with the same plan for three years, you may be paying $20 more per month than the cheapest option available to you now.

During the annual open enrollment period (October 15 to December 7), you can switch to any other Part D plan without penalty. Medicare's Plan Finder tool lets you enter your current drugs and see which plans cover them and at what cost. Many people find they can cut their Part D premium by $100 to $200 per year just by switching plans. If you have not checked your options in the past two years, this is often the fastest way to lower your total Medicare costs.

If you take expensive brand-name drugs, ask your doctor whether a generic or lower-tier alternative exists. Some plans charge $50 for a brand-name drug but $5 for the generic version. Your pharmacist can also tell you which plans have the lowest copay for your specific medications.

Programs That Help Pay Your Premiums If Your Income Is Low

If your income is below 150 percent of the federal poverty line (roughly $2,100 per month for a single person in 2024), you may may have access to for Medicaid or the Medicare Savings Program to help pay your Part B and Part D premiums. These programs are run by your state, not by Medicare, and may be able to access rules vary. Some states cover premiums only; others also cover deductibles and copays.

To find out whether you may have access to, contact your state Medicaid office or call 211. You will need to provide proof of income (recent pay stubs, tax return, or Social Security statement) and proof of citizenship. Processing usually takes two to four weeks. If you are approved, the program pays your premium directly to Medicare, and your monthly bill drops when ready.

These programs do not lower your income-based surcharge (IRMAA). If you earn $100,000 and may have access to for Medicaid, you still pay the IRMAA surcharge on top of your base premium. But Medicaid or the Medicare Savings Program will cover the base premium itself, so your net cost may still be lower.

What to Do If Your Premium Increased Suddenly

If your Part B or Part D premium jumped from one month to the next, check your Medicare Summary Notice or log into your Medicare account to see the reason. The most common causes are: (1) your income rose above an IRMAA threshold, (2) you turned 65 and enrolled late, or (3) you switched plans and the new plan costs more.

If the increase is due to IRMAA and your income actually dropped in the current year, file a Life-Changing Event appeal within 60 days. If it is due to a late enrollment penalty, you cannot remove it, but you can reduce future costs by switching to a cheaper Part D plan during open enrollment. If you switched plans and regret it, you have 60 days to switch back to your previous plan without penalty.

If you cannot afford your premium, contact your state Medicaid office or call 211 to ask about low-income information programs. Do not skip paying your premium — if you fall behind, Medicare can disenroll you from Part D, and you will owe a penalty when you re-enroll.

Frequently Asked Questions

Can I appeal my IRMAA surcharge if my income dropped this year?

Yes. If your income fell due to retirement, job loss, death of a spouse, or other major life change, you can request that Medicare recalculate your premiums using current-year income. You must file this appeal within 60 days of receiving your premium notice. Contact Social Security or Medicare to request a Life-Changing Event review and provide proof of the income change.

Will my late enrollment penalty ever go away?

No. Late enrollment penalties for Part B and Part D are permanent and stay on your bill for life. The only way to avoid them is to sign up during your initial may be able to access period (the seven months centered on your 65th birthday) or within 63 days of losing other creditable coverage.

Can I switch Part D plans if I think I am paying too much?

Yes, during the annual open enrollment period from October 15 to December 7 each year. You can switch to any other Part D plan at no penalty. Use Medicare's Plan Finder to compare costs for your current medications. Many people save $100 to $300 per year by switching to a lower-cost plan.

Does switching from Original Medicare to Medicare Advantage lower my Part B premium?

No. Your Part B premium is the same regardless of which plan type you choose. The difference is in copays and out-of-pocket costs per visit. Medicare Advantage often has lower copays but a network; Original Medicare has no network but higher coinsurance. Compare your total expected costs, not just the monthly premium.

What if I cannot afford my Medicare premium?

Contact your state Medicaid office or call 211 to ask about the Medicare Savings Program or Medicaid. These programs help pay premiums, deductibles, and copays for people with low income. You will need to provide proof of income and citizenship. Processing takes two to four weeks.