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Quick Answer
You can safely delay Medicare Part B (and Part D) if you have qualifying employer coverage through active employment at a company with 20+ employees. Delaying without qualifying coverage triggers a permanent 10% Part B penalty for each 12-month period missed, plus a Part D penalty of 1% per month. Part A is usually free and safe to take at 65.
Coverage Comparison by Plan Type
| Plan Type | Coverage | Notes |
|---|---|---|
| Active employer (20+ employees) | Safe to delay Part B and D | Employer coverage is primary; Medicare secondary |
| Retiree coverage only | NOT safe to delay | Retiree coverage is secondary to Medicare; penalties apply |
| COBRA coverage | NOT safe to delay | COBRA is secondary to Medicare; penalties apply |
| No employer coverage | Must enroll at 65 | Missing IEP triggers permanent penalties |
Understanding Your Coverage Options
When You Can Safely Delay Part B
You can delay Part B enrollment without penalty if you (or your spouse) are actively employed at a company with 20 or more employees and you are covered under that employer's group health plan. The key word is 'active' - retiree coverage, COBRA, and marketplace plans do NOT qualify.
When you eventually leave that employer coverage, you have an 8-month Special Enrollment Period (SEP) to enroll in Part B without penalty. This SEP begins when employment ends or the employer coverage ends, whichever comes first.
What It Covers
- Delay is penalty-free with active employer group coverage (20+ employees)
- 8-month SEP to enroll after employment or coverage ends
- Part A can usually be taken at 65 for free (if 40+ work quarters) without affecting employer coverage
- Spouse's employer coverage also qualifies if you are covered under it
What It Doesn't Cover
- Retiree coverage does NOT qualify - you must enroll in Part B at 65
- COBRA does NOT qualify as creditable employer coverage for delay purposes
- Marketplace/ACA plans do NOT qualify for penalty-free delay
Part B Late Enrollment Penalty
If you delay Part B enrollment without qualifying coverage, you face a permanent 10% premium surcharge for each full 12-month period you were eligible but did not enroll. This penalty is added to your Part B premium for as long as you have Medicare.
For example, if you delay 2 years without qualifying coverage, your Part B premium increases by 20% permanently. At $202.90/month in 2026, that's an extra $40.58/month - or $486.96/year - for life.
What It Covers
- Penalty applies only to Part B premium, not Part A
- Penalty is calculated based on full 12-month periods of non-enrollment
- You can appeal the penalty if you can prove you had creditable coverage
What It Doesn't Cover
- No waiver of penalty for most circumstances - it is permanent
- Does not apply if you had qualifying employer coverage during the delay period
- Does not affect Part A enrollment or premiums
Permanent Penalty Warning
The Part B late enrollment penalty is permanent - it never goes away. A 2-year delay without qualifying coverage adds 20% to your Part B premium for life.
Part D Late Enrollment Penalty
The Part D late enrollment penalty is 1% of the national base beneficiary premium ($36.78 in 2026) for each month you went without creditable drug coverage after becoming eligible for Medicare. Unlike Part B, this penalty is recalculated annually based on the national base premium.
Creditable drug coverage includes most employer group plans, VA drug coverage, and TRICARE. If your employer plan provides creditable drug coverage, you can delay Part D without penalty until you lose that coverage.
What It Covers
- Employer group drug coverage counts as creditable - delay is penalty-free
- VA drug coverage is creditable - no Part D penalty
- TRICARE drug coverage is creditable - no Part D penalty
- Penalty begins only after a continuous 63-day gap in creditable coverage
What It Doesn't Cover
- Marketplace/ACA drug coverage is NOT always creditable - verify with your plan
- Penalty is recalculated each year and never goes away
- Does not cover the cost of drugs during the penalty period
Small Employer (under 20 Employees): Must Enroll
If your employer has fewer than 20 employees, Medicare becomes the primary payer at age 65 - even if you are still actively employed. Your employer plan becomes secondary. If you do not enroll in Part B, your employer plan may deny claims that Medicare would have paid, leaving you with large unexpected bills.
This is one of the most common and costly Medicare mistakes. Always check your employer's size before deciding to delay.
What It Covers
- Must enroll in Part B at 65 if employer has under 20 employees
- Part A is still usually free and should be taken at 65
- Coordination of benefits: Medicare pays first, employer plan pays second
What It Doesn't Cover
- Employer plan does NOT pay what Medicare would have paid if you skip Part B
- No SEP available - you must use your IEP (7-month window around 65th birthday)
- Late enrollment penalty applies if you miss your IEP
How to Enroll after Delaying
When your qualifying employer coverage ends, you have an 8-month Special Enrollment Period to enroll in Part B. You do not need to wait for the General Enrollment Period (Jan 1 – Mar 31). Coverage begins the month after you enroll, or up to 6 months retroactively if you delay within the SEP.
For Part D, you have a 63-day window after losing creditable drug coverage to enroll without penalty. Contact your Part D plan directly or enroll through Medicare.gov.
What It Covers
- 8-month SEP for Part B after employer coverage ends
- 63-day window for Part D after losing creditable coverage
- Can enroll in Part B at any time during the 8-month SEP - no waiting for GEP
- Retroactive Part B coverage available for up to 6 months if requested
What It Doesn't Cover
- SEP does not extend beyond 8 months - missing it means waiting for GEP with penalty
- GEP (Jan 1–Mar 31) coverage does not start until July 1 - a long gap
- Does not waive penalties if you miss the SEP window
Medicare Delay Penalty Calculator (2026)
| Scenario | Part B Penalty | Part D Penalty | Notes |
|---|---|---|---|
| Delay with qualifying employer (20+ employees) | None | None | Safest delay scenario |
| Delay 1 year without qualifying coverage | +10% permanently (~$20.29/month) | +12% of base premium/year | Costly mistake |
| Delay 2 years without qualifying coverage | +20% permanently (~$40.58/month) | +24% of base premium/year | Very costly |
| Delay with COBRA or retiree coverage | +10% per year missed | +1%/month without creditable Rx | Common mistake - COBRA does not qualify |
| Small employer (under 20 employees) | +10% per year if delayed | +1%/month without creditable Rx | Must enroll at 65 |
✦ Important Exceptions
VA Coverage and Part B
VA health benefits do not qualify as creditable coverage for Part B delay purposes. You should still enroll in Part B if eligible.
Working past 65 with Large Employer
If your employer has 20+ employees and you are actively employed, you can delay Part B and Part D indefinitely without penalty.
Social Security before 65
If you collect Social Security before 65, you are automatically enrolled in Part A and Part B at 65. You must actively opt out of Part B if you want to delay.
FEHB (Federal Employees)
Federal employees with FEHB coverage can delay Part B. FEHB is creditable coverage for both Part B and Part D delay purposes.
✦ Legislative Updates
2026 Part B Premium: $202.90/month
PassedThe standard Part B premium increased to $202.90/month in 2026, making the 10% penalty worth $20.29/month per year of delay.
Part D Base Premium: $36.78/month (2026)
PassedThe national base beneficiary premium for calculating Part D penalties is $36.78 in 2026.
IRA Part D Redesign (2025)
PassedThe Inflation Reduction Act capped Part D OOP at $2,000 in 2025, making Part D enrollment more valuable than before.
Steps to Avoid Medicare Penalties
The best way to avoid Medicare penalties is to understand your coverage situation before you turn 65. If you have employer coverage, confirm your employer size and whether your drug plan is creditable. Keep documentation of all coverage periods.
If you are approaching the end of employer coverage, contact Social Security or Medicare.gov immediately to begin the enrollment process. Do not wait until the last minute - processing can take 4–6 weeks.
Medicare Delay Checklist
- Confirm your employer has 20+ employees before deciding to delay Part B
- Verify your employer drug plan is 'creditable' - ask HR for a creditable coverage notice each year
- Do NOT delay if you have COBRA, retiree coverage, or a marketplace plan
- Set a reminder for your 8-month SEP window when employment ends
- Enroll in Part A at 65 if it is premium-free - it does not affect employer coverage
- If you receive Social Security before 65, actively opt out of Part B if you want to delay
- Keep documentation of your employer coverage in case you need to appeal a penalty later
✦ Frequently Asked Questions
David Haass
AuthorDavid Haass is a licensed Medicare expert who has been helping beneficiaries navigate their Medicare options for over a decade.
Ashlee Zareczny
ReviewerAshlee Zareczny is a licensed Medicare agent dedicated to helping those eligible for Medicare find the best coverage options.