What Medicare Part B Will Cost You in 2025

Medicare Part B premiums and deductibles change every year. For 2025, the standard monthly premium is $185.80 for most people who have Medicare Part B. The annual deductible is $240. After you meet that deductible, you typically pay 20% of the cost for doctor visits, outpatient services, and other covered care — Medicare pays the other 80%.

These figures explore if you enroll in Part B when you first become may be able to access or during the standard enrollment period. If you delay enrollment without a valid reason, you may pay a permanent penalty on top of the base premium. The actual amount you pay can also be higher if your income is above certain thresholds, which triggers an additional surcharge called Income-Related Monthly Adjustment Amount (IRMAA).

Key Takeaways

  • The standard Part B premium for 2025 is $185.80 per month, and the annual deductible is $240.
  • You pay 20% of covered services after you meet your deductible; Medicare covers the remaining 80%.
  • If your modified adjusted gross income exceeds certain limits, you will pay an additional surcharge on top of the base premium.
  • Late enrollment penalties are permanent and increase your premium for as long as you have Part B.
  • Your actual costs depend on which services you use and whether you have supplemental coverage or a Medicare Advantage plan.

How Income Affects Your Part B Premium in 2025

If your income is above a certain level, Medicare charges you more for Part B. This extra charge is called Income-Related Monthly Adjustment Amount (IRMAA). For 2025, the income thresholds are based on your modified adjusted gross income from two years prior — so your 2025 IRMAA is based on your 2023 tax return.

The income brackets and surcharges vary. If you file taxes as a single person and your 2023 modified adjusted gross income was between $97,000 and $121,000, you pay an additional amount on top of the $185.80 base premium. Higher income brackets trigger higher surcharges. Married couples filing jointly have different thresholds, starting at $194,000. If your income changes significantly — due to retirement, a major sale, or loss of a spouse — you can request a reconsideration of your IRMAA.

Part B Deductible and Coinsurance Explained

The Part B deductible of $240 per year means you must pay that amount out of pocket before Medicare begins to share costs with you. This deductible resets on January 1 each year. Once you have paid $240 toward covered services, Medicare then covers 80% of the approved amount for most outpatient services, and you pay the remaining 20%.

The 20% you pay is called coinsurance. For example, if you see a doctor and the approved charge is $100, you pay $20 and Medicare pays $80 — but only after you have met your $240 deductible. Some services, such as preventive care visits and screenings, are covered at 100% with no deductible or coinsurance required. Other services, like mental health visits, may have different cost-sharing rules.

Late Enrollment Penalties and How They Work

If you do not enroll in Part B when you first become may be able to access and you do not have a valid reason for the delay, Medicare charges you a permanent penalty. The penalty is 10% of the base Part B premium for each full 12-month period you were not enrolled. This penalty is added to your premium for as long as you have Part B.

For example, if you delayed enrollment for two years and the base premium is $185.80, your penalty would be roughly $37.16 per month (20% of the base premium), added to your regular premium. This penalty does not go away if you enroll later. Valid reasons for delaying enrollment without penalty include having employer coverage through current work or being a federal employee. If you believe you have a valid reason, you can request a waiver of the penalty when you enroll.

Supplemental Coverage and Medicare Advantage Alternatives

Many people buy additional coverage to reduce their out-of-pocket costs under Original Medicare Part B. A Medigap (supplemental) policy is sold by private insurers and covers some or all of the costs you would otherwise pay — such as the deductible, coinsurance, and copayments. Medigap premiums vary by plan type and insurer, and they are separate from your Part B premium.

Alternatively, you can enroll in a Medicare Advantage plan (Part C), which is an all-in-one alternative to Original Medicare. Medicare Advantage plans typically have lower or no premiums than Medigap, but they often have higher deductibles and copayments, and they restrict you to a network of doctors. Some Medicare Advantage plans include prescription drug coverage (Part D) built in. Your choice between Original Medicare with Medigap, Original Medicare alone, or Medicare Advantage affects your total 2025 costs significantly.

When and How Part B Premiums Are Deducted

If you receive Social Security benefits, your Part B premium is automatically deducted from your monthly Social Security payment. If you do not receive Social Security, Medicare sends you a bill each month, and you pay directly. Some people pay quarterly or annually if they prefer. You can change your payment method by contacting Social Security or Medicare.

Premiums are due on the first of the month for coverage that month. If you enroll in Part B for the first time, your coverage typically begins the first day of the month after you enroll, and your first premium is due then. If you are late paying a premium, Medicare may disenroll you, and you would have to wait until the next enrollment period to re-enroll — which could trigger a late enrollment penalty.

Changes to Part B Costs Year to Year

Part B premiums and deductibles are adjusted annually based on inflation and changes in Medicare's costs. The Centers for Medicare & Medicaid Services (CMS) announces the new amounts each fall for the following year. The 2025 figures — $185.80 premium and $240 deductible — are higher than 2024 amounts. Future years will likely see further increases, though the exact amount depends on economic conditions and healthcare costs.

If you are already enrolled in Part B, you do not need to do anything when costs change. Your premium adjustment happens automatically. If you are considering whether to enroll, comparing the 2025 costs to your expected healthcare use and your other coverage options can help you decide whether Part B makes sense for you.

Frequently Asked Questions

Do I have to pay Part B premiums if I am still working?

If you are covered by an employer health plan through current work, you can delay Part B enrollment without penalty. However, you must enroll within eight months of losing that employer coverage or you will face a late enrollment penalty. Once you do enroll, you will pay the standard Part B premium plus any applicable IRMAA surcharge.

Can I get Part B for free?

No. Everyone with Part B pays at least the base premium of $185.80 per month in 2025, unless you may have access to for a subsidy through Medicaid or another program. Some low-income beneficiaries may receive help paying premiums through the Medicare Savings Program, which is run by your state.

What happens if I cannot afford the Part B premium?

Contact your state Medicaid office or local Area Agency on Aging to learn about the Medicare Savings Program. This program helps pay Part B premiums, deductibles, and coinsurance for people with limited income and resources. may be able to access and benefit amounts vary by state.

Does Part B cover everything a doctor charges?

Part B covers the approved amount Medicare sets for each service. If a doctor does not accept Medicare assignment, they can charge you more than the approved amount. You are responsible for the difference. Doctors who accept assignment agree to charge only the Medicare-approved amount.

Will my Part B costs increase if I delay enrollment?

Yes. If you delay enrollment without a valid reason, you pay a permanent 10% penalty per year of delay, added to your base premium. This penalty never goes away. Additionally, your income-related surcharge (IRMAA) is calculated based on your income from two years prior, so higher recent income will increase your 2025 costs.