Medicare Planning · Price Services Group, L.L.C.
How to avoid Medicare late enrollment penalties in 2026
Missing a Medicare enrollment deadline can add an ongoing surcharge to your premiums. Special Enrollment Periods and other exceptions may prevent a penalty. Check the separate Part B and Part D rules before deciding to wait.
The bottom line
- The Part B penalty is generally 10% per full 12 months of delay without a qualifying exception, while you have Part B.
- The Part D penalty uses 1% per full uncovered month after a qualifying gap; Extra Help recipients do not pay it.
- Part B and Part D have different exceptions: group health coverage based on current employment may qualify you for a Part B SEP; Part D requires creditable prescription drug coverage. Other special circumstances can also qualify.
- COBRA, retiree plans, and marketplace coverage do not protect you from the Part B penalty.
- Your Initial Enrollment Period is 7 months — 3 months before your birthday month, your birthday month, and 3 months after.
Medicare penalties can have lasting costs. Part B and Part D penalties generally continue while you have the respective coverage, but exceptions and assistance programs matter. Verify your situation with Medicare or Social Security rather than assuming every missed deadline produces a lifetime penalty.
The good news: the penalties are completely avoidable if you know the rules. This guide covers exactly when to enroll, what qualifies as a valid reason to delay, and the costly mistakes that trap thousands of new beneficiaries each year.
The three penalties at a glance
| Part | Penalty | When it applies | How to avoid it |
|---|---|---|---|
| Part A | None for premium-free Part A | If you must buy Part A, a 10% premium penalty may apply for twice the number of years you delayed | Qualifying Special Enrollment Periods may prevent a penalty |
| Part B | 10% per 12-month period uncovered | Every full year you were eligible but didn't enroll (without qualifying coverage) | Active employer coverage (yours or spouse's) lets you delay without penalty |
| Part D | 1% per month uncovered | Each month without creditable drug coverage after Part D eligibility | Creditable employer drug coverage lets you delay without penalty |
Source: Medicare.gov — Avoid Late Enrollment Penalties.
Your Initial Enrollment Period (IEP)
People first eligible for Medicare at 65 generally have a 7-month Initial Enrollment Period centered on their 65th birthday month:
- 3 months before your birthday month
- Your birthday month
- 3 months after your birthday month
For Part B and premium-Part A, when you enroll matters for when coverage starts:
- Enroll in months 1–3 (before birthday month): coverage starts the 1st of your birthday month
- Enroll in month 4 (birthday month): coverage starts the 1st of the following month
- Enroll in months 5–7 (after birthday month): coverage starts the first of the next month
If you miss your IEP, check whether you qualify for a Special Enrollment Period. Otherwise, the General Enrollment Period for Part B and premium-Part A runs January 1 – March 31, with coverage starting the month after you sign up. A late enrollment penalty may apply. Premium-free Part A follows different rules.
If your birthday is on the first of a month, Medicare uses the preceding month for your age-65 enrollment timing. Confirm your dates with Social Security before applying.
The Part B penalty — how it adds up
The Part B late-enrollment penalty is 10% of the standard Part B premium for every full 12-month period you were eligible for Part B but didn't enroll — and didn't have qualifying employer coverage.
Example: The 2026 standard Part B premium is $202.90/month. If you delayed Part B for 3 full years without qualifying coverage or another exception:
- 3 years × 10% = 30% penalty
- 30% × $202.90 = $60.87 before rounding
- After adding the penalty, the total monthly premium rounds to $263.80
The penalty generally continues while you have Part B. The dollar amount changes when the standard premium changes; Medicare Savings Programs and other exceptions may affect whether a penalty applies.
The Part D penalty — the drug coverage trap
You may owe a Part D penalty if, after your Initial Enrollment Period ends, you go 63 or more days in a row without Part D or creditable prescription drug coverage. The calculation uses 1% of the national base beneficiary premium for each full uncovered month. People receiving Extra Help do not pay this penalty.
Example: The 2026 national base beneficiary premium is $38.99/month. If you had 24 full uncovered months and no exception:
- 24 months × 1% = 24% penalty
- 24% × $38.99 = $9.3576, rounded to the nearest 10 cents: $9.40/month added to your Part D premium
- This amount adjusts annually and generally continues while you have Medicare drug coverage
Many people skip Part D at 65 because they're healthy and "don't take any prescriptions." But a single new diagnosis requiring a specialty drug can result in thousands in drug costs — plus the penalty you'd pay on top.
Delaying enrollment: check Part B and Part D separately
For Part B, group health coverage based on your or your spouse's current employment may qualify you for a Special Enrollment Period. Confirm which insurer pays first, especially with an employer of fewer than 20 employees. For Part D, obtain the plan's written creditable prescription drug coverage notice; employer health coverage alone does not establish drug creditability.
- Part B SEP: 8 months from when employment or employer coverage ends (whichever comes first)
- Part D SEP: generally two full months after the month employer or union coverage ends. Confirm your specific enrollment dates and avoid a 63-day drug coverage gap.
Critical distinction: the 8-month Part B SEP starts from when your active employment or employer coverage ends — not when COBRA ends. If you have employer coverage through March and COBRA runs through December, your 8-month clock starts in March, not December.
Coverage types that do NOT protect you from the Part B penalty: COBRA, retiree health coverage, marketplace/ACA plans, individual health insurance, VA coverage (for most situations). When in doubt, verify with your employer's benefits administrator and with Medicare directly.
IRMAA — the income-related premium surcharge
Separate from late-enrollment penalties, higher-income Medicare beneficiaries pay an additional surcharge on Part B and Part D premiums called IRMAA (Income-Related Monthly Adjustment Amount). IRMAA is based on your Modified Adjusted Gross Income (MAGI) from 2 years prior.
If your income has dropped significantly since then (retirement, death of a spouse, loss of a business), you can appeal IRMAA using SSA Form SSA-44. Unlike late-enrollment penalties, IRMAA adjusts each year as your income changes.
How to avoid all of this
- Know your 7-month IEP window and mark it on your calendar 6 months before you turn 65.
- Verify current-employment group coverage and payment order with your benefits administrator. Separately request the written Part D creditable coverage notice.
- Don't assume COBRA extends your Part B SEP. Its drug benefits may separately qualify as creditable for Part D.
- If you lack creditable drug coverage, consider Part D even if you take no prescriptions. Compare costs and enroll during a valid window to avoid a future penalty.
- Talk to a licensed Medicare agent before you turn 65, not after. The rules are straightforward once explained, but costly when misunderstood.
Frequently asked questions
What is the Medicare Part B late enrollment penalty?
Part B generally charges 10% of the standard premium for each full 12-month period of delay without a qualifying exception. Two full years would mean a 20% penalty, generally while you have Part B. Qualifying Special Enrollment Periods and Medicare Savings Programs may prevent a penalty.
What is the Medicare Part D late enrollment penalty?
After a gap of 63 or more days following your Initial Enrollment Period without Part D or creditable prescription drug coverage, you may owe 1% of the national base beneficiary premium per full uncovered month, rounded to the nearest 10 cents. It generally continues while you have Medicare drug coverage. Extra Help recipients do not pay this penalty.
Can I delay Medicare Part B without a penalty if I have employer insurance?
Yes — if you (or your spouse) are actively working and have health coverage through a current employer's group health plan, you can delay Part B without penalty. When that employment or coverage ends, you get an 8-month Special Enrollment Period to enroll in Part B without penalty. Important: COBRA, retiree coverage, and marketplace plans do NOT qualify as 'current employer coverage' for this purpose.
Does COBRA coverage protect me from the Part B penalty?
COBRA does not qualify as group health coverage based on current employment for the Part B Special Enrollment Period. That window generally ends 8 months after employment or that group coverage ends, whichever happens first; COBRA does not extend it. COBRA drug benefits may separately be creditable for Part D.
What is IRMAA and how does it affect my Medicare premiums?
IRMAA (Income-Related Monthly Adjustment Amount) is an additional surcharge on Part B and Part D premiums for higher-income beneficiaries. It's based on your income from 2 years prior. If your income drops significantly (retirement, loss of a spouse, etc.), you can appeal IRMAA using Form SSA-44. IRMAA is separate from late-enrollment penalties.
Turning 65 or losing employer coverage soon?
Kayla Price at Price Services Group, L.L.C. helps you navigate enrollment windows, avoid penalties, and find the right coverage — at no cost to you. We do not offer every plan available in your area.
Get a free enrollment review →Reviewed October 11, 2026. Sources: Medicare.gov penalty rules and Part D calculation · Medicare.gov coverage start dates and SEPs · CMS 2026 premiums. Price Services Group, L.L.C. is an independent licensed agency — we do not offer every plan available in your area.