The Medicare Part B late-enrollment penalty is generally 10% of the standard Part B premium for every complete 12-month period you could have had Part B but did not enroll. The surcharge usually remains on your monthly premium for as long as you have Part B. In the Centers for Medicare & Medicaid Services (CMS) 2026 example, a 24-month delay creates a 20% surcharge: $40.58 added to the $202.90 standard premium, for a rounded monthly bill of $243.50.
The safest way to avoid the penalty is to enroll during your Initial Enrollment Period around age 65, or to use the eight-month Special Enrollment Period (SEP) tied to qualifying current-employment group coverage. COBRA, retiree insurance and some small-employer plans do not provide the same protection.
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What the Part B late-enrollment penalty is
Part B covers medically necessary doctors’ services, outpatient care and many preventive services. If you are eligible for Part B and go without it for one or more complete 12-month periods, Medicare increases your monthly Part B premium by 10% for each period. The calculation counts only full 12-month blocks, not leftover months.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchThe surcharge generally continues for the entire time you keep Part B. It is not a one-time fee and it does not normally disappear after you have paid it for a few years. Because the premium and the percentage surcharge recur every month, a delay can affect a retirement budget for decades.
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The percentage is applied to the standard Part B premium used for the applicable year. Your actual bill can be higher if an income-related adjustment applies, so the CMS illustration is not a promise of every beneficiary’s premium.
How Medicare calculates the surcharge
The basic formula
Use this sequence:
- Determine how many complete 12-month periods passed while you could have enrolled in Part B but did not.
- Multiply that number by 10% to find the penalty percentage.
- Apply the percentage to the standard Part B premium for the year.
- Add the surcharge to the standard premium. Medicare rounds the resulting monthly amount according to its billing rules.
A 27-month delay contains two complete 12-month periods, so it produces a 20% penalty, not 30%. The remaining three months do not create another penalty period.
CMS’s 2026 example
| Item | 2026 amount |
|---|---|
| Standard Part B premium | $202.90 per month |
| Delay | 24 complete months |
| Penalty rate | 20% of the standard premium |
| 20% surcharge | $40.58 per month |
| Calculated total | $243.48 before rounding |
| Rounded monthly premium in the CMS example | $243.50 |
This is CMS’s official 2026 illustration. A person subject to an income-related adjustment can owe more than the amount shown, because the adjustment is separate from the late-enrollment calculation.
What the formula does not establish
The cited Medicare and CMS guidance does not provide a universal dollar cap on the Part B penalty or a national count of how many beneficiaries pay it. Do not rely on an assumed maximum or on an online estimate of how common the surcharge is.
Enrollment periods that can prevent a penalty
Initial Enrollment Period at 65
Your Initial Enrollment Period (IEP) generally begins three months before the month you turn 65 and ends three months after your birthday month. Enrolling in Part B during this window avoids a late-enrollment penalty for that eligibility period.
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Mark the entire window on your calendar rather than waiting for your birthday month. If you want Part B to start immediately after employer coverage ends, coordinate the effective date with the employer’s benefits office and Social Security before the job or coverage ends.
Special Enrollment Period for current-employment coverage
If you or a spouse has group health coverage based on current employment, Medicare generally offers an eight-month SEP after the employment or the group coverage ends, whichever comes first. Medicare also says you can use this SEP while you are still covered by the qualifying group plan.
The key requirement is that the coverage be tied to current employment. Ask the benefits administrator to confirm that basis in writing and to explain how the plan pays in relation to Medicare. Keep the employment end date and the coverage termination date; the earlier date controls the eight-month clock.
Enrollment may require forms documenting employer coverage. Submit the Social Security and employer-coverage paperwork early enough to obtain the Part B start date you need, particularly if employer coverage will end before you expect Medicare to begin.
Can you delay Part B while still working?
Often, yes, when you are covered by a group health plan based on current employment and the plan’s coordination rules make delaying Part B appropriate. The decision is not determined solely by whether you have an insurance card. Verify the employment basis, the employer’s size and the plan’s payment order.
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Questions for the benefits administrator
- Is the plan based on current employment, rather than retirement or continuation coverage?
- Is the employment yours, your spouse’s or another family member’s qualifying employment?
- How does the plan coordinate with Medicare when an employee is Medicare-eligible?
- What are the exact employment and group-coverage end dates?
- Will the plan continue paying claims if Part B is delayed?
- Which employer and Social Security forms are needed for an SEP enrollment?
Obtain answers before declining Part B. A general statement that the plan is “active” does not prove that it is qualifying current-employment coverage for Medicare purposes.
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Medicare specifically warns that job-based coverage from a company with fewer than 20 employees might not pay for services unless you have both Part A and Part B. Ask how the plan determines primary and secondary payment, and do not assume the employer plan will protect you from unpaid claims simply because premiums are being deducted.
Why COBRA does not protect you from the Part B penalty
COBRA continuation coverage lets you remain on an employer plan after employment or other qualifying events, but it does not extend the employment-based eight-month Part B SEP. Medicare’s guidance states that the clock starts when you stop working or lose job-based insurance, whichever happens first, whether or not you elect COBRA or another non-Medicare policy.
That means a person who retires, elects COBRA and waits beyond the eight-month deadline can still face the penalty. COBRA can also leave you waiting for the General Enrollment Period, which runs from January 1 through March 31, creating a period without Part B and exposing you to additional complete 12-month periods.
A practical COBRA timeline
- Record the last day of active employment and the last day of active employee coverage.
- Use whichever of those dates comes first to start the eight-month SEP clock.
- Do not count COBRA months as an extension of the deadline.
- Contact Social Security and the employer benefits office before the deadline to coordinate Part B’s effective date.
- Keep copies of the COBRA election, employment-end notice and employer-coverage documentation.
Medicare summarizes the rule this way: “You have up to 8 months after you stop working (or lose your health insurance, if that happens first) to sign up for Part B without a penalty, whether or not you choose COBRA.”
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Retiree insurance is different from current-employment coverage
Retiree insurance from a former employer or union is not the same as an active-employee group plan. Medicare warns that retiree coverage may not pay medical costs during periods when you were eligible for Medicare but had not enrolled in both Part A and Part B.
Before declining Part B, request the retiree plan’s written coordination rules. Ask whether the plan assumes Medicare is primary, whether claims are denied when Part B is missing, and whether enrolling later changes premiums or benefits. If the plan assumes Medicare enrollment, postponing Part B can create unpaid bills as well as a future surcharge.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What happens if you miss every protected enrollment window?
If you do not enroll during the IEP and do not qualify for an SEP, Medicare directs you to the General Enrollment Period from January 1 through March 31. Waiting for that period can produce a coverage gap because Part B is not available immediately when you first realize you missed the deadline.
The uncovered months continue to matter for penalty purposes. Once you eventually enroll, Medicare counts the complete 12-month periods in which you could have had Part B but did not. The resulting 10%-per-period surcharge generally remains while you maintain Part B.
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Immediate steps after discovering a missed deadline
- Write down the date you first became eligible for Part B, your 65th-birthday month and every employment or coverage end date.
- Ask Medicare or Social Security which enrollment period applies to your facts.
- Have the employer or union benefits office confirm in writing whether coverage was based on current employment.
- Ask whether your employer’s size changes who pays claims.
- Find out whether you can enroll under an SEP now or must wait for the General Enrollment Period.
- Request an estimate of the Part B premium, including any applicable income-related adjustment, after Medicare determines your penalty period.
Do not cancel COBRA, retiree coverage or another policy until you know when Part B will begin and which plan will pay during any transition.
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Comparing common coverage situations
| Coverage situation | Based on current employment? | Employer-size issue | Eight-month SEP? | Coverage-gap risk if Part B is delayed | Penalty risk |
|---|---|---|---|---|---|
| Active employee group plan at a qualifying employer | Usually yes; verify with the benefits administrator | Payment order can change with employer size | Generally available after employment or coverage ends, whichever comes first | Lower when dates and paperwork are coordinated | Usually avoidable if enrollment occurs during the SEP |
| COBRA continuation | No; it is continuation coverage | The former employer’s size does not extend the deadline | COBRA does not extend the current-employment SEP | High if the eight-month clock is missed | Possible, usually lasting while Part B is held |
| Retiree employer or union plan | No; it is based on former employment | Read the plan’s Medicare coordination rules | Not automatically available because of retiree coverage | High if the plan assumes Medicare and Part B is absent | Possible after a missed IEP or other qualifying SEP |
| Group plan from an employer with fewer than 20 employees | It may be current-employment coverage | Medicare warns the plan might not pay unless you have Part A and Part B | Confirm eligibility with Medicare and the plan | Potentially high if Medicare should be primary | Possible if no protected enrollment period applies |
A penalty-avoidance checklist
- Identify your IEP: Count three months before through three months after your 65th-birthday month.
- Classify your insurance: Determine whether it is active-employee coverage, COBRA, retiree coverage or another arrangement.
- Check employer size: Ask how the plan pays claims when a worker is Medicare-eligible, especially if fewer than 20 employees work for the company.
- Document dates: Keep the last day of employment and the last day of active group coverage.
- Protect the SEP: Treat the earlier of those dates as the start of the eight-month deadline.
- Coordinate effective dates: Work with the employer and Social Security so Part B starts when active coverage ends.
- File forms early: Submit the required employer-coverage and Social Security forms before the desired start date.
- Get case-specific help: Medicare, Social Security, your benefits office and State Health Insurance Assistance Program (SHIP) counselors can explain enrollment and coordination questions.
How to budget for the penalty
Start with the standard Part B premium for the year in question, then add the percentage created by complete uncovered 12-month periods. The CMS 2026 example shows why the surcharge is material: a 20% penalty adds $40.58 every month to the $202.90 standard premium, producing $243.50 after rounding.
Multiply the monthly difference by 12 to see the annual effect, then remember that the surcharge generally continues as long as you keep Part B. Your total can be higher if an income-related adjustment applies. Recheck the premium each year because the standard premium used in the calculation can change.
Where to get help with an uncertain case
Enrollment rules depend on the facts Medicare asks about: the type of coverage, current-employment status, employer size, dates and whether you are continuing coverage under COBRA. Ask Medicare or Social Security to identify the applicable enrollment period and required forms. Ask your employer or union benefits administrator for written coordination rules.
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Quick Recap
Key takeaways
- The standard rule is 10% of the applicable standard Part B premium for each complete 12-month period without Part B when you were eligible.
- The surcharge generally stays in place for the duration of Part B.
- CMS’s 2026 illustration uses a $202.90 premium and shows a 20% penalty producing a rounded $243.50 monthly premium after a 24-month delay.
- The IEP usually spans three months before through three months after your birthday month.
- Qualifying current-employment coverage can provide an eight-month SEP, but COBRA does not extend it.
- Retiree coverage and plans from employers with fewer than 20 employees require written confirmation of how claims are paid when Part B is missing.
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