Frequently Asked Questions
What is the Medicare Part B late enrollment penalty?
If you don't sign up for Part B when first eligible and don't have qualifying employer coverage, you pay a 10% penalty for every 12-month period you were eligible but didn't enroll — added to your Part B premium permanently. Example: if you were eligible for 2 years before enrolling, your Part B premium is 20% higher for life. In 2026, the standard Part B premium is $202.90/month — a 20% penalty adds $40.58/month, or about $487/year, forever.
What is the Medicare Part D late enrollment penalty?
If you go without creditable drug coverage for 63 or more consecutive days after your Initial Enrollment Period ends, you pay a 1% penalty for every month you were without coverage, multiplied by the national base beneficiary premium ($38.99 in 2026). The penalty is rounded to the nearest $0.10 and added to your monthly Part D premium permanently. A 24-month gap = 24% penalty = approximately $9.40/month added to your Part D premium every month for life.
What counts as creditable coverage for Medicare Part D?
Creditable prescription drug coverage is coverage that's expected to pay at least as much as standard Medicare drug coverage. It includes: employer or union drug coverage, VA drug benefits, TRICARE, FEHBP coverage, and individual health insurance that includes drugs. When you leave creditable coverage, your employer must provide a Notice of Creditable Coverage. Keep this notice — you'll need it to prove coverage and avoid Part D penalties.
Is there a Part A late enrollment penalty?
Yes, but it only applies to people who have to pay for Part A (those with fewer than 40 work quarters). If you're in this group and don't enroll when eligible, you pay a 10% premium penalty for twice the number of years you delayed enrollment. Most Americans get Part A premium-free and aren't affected by this penalty.
Can the late enrollment penalty be waived?
In limited circumstances. If you delayed enrollment because of employer coverage and disenroll after retiring, you have an 8-month Special Enrollment Period with no penalty. Proof of prior creditable coverage is required. If you receive a penalty in error, you can appeal through SSA. Some low-income seniors with Medicare Savings Program enrollment may have penalties reduced. There is no general waiver for simply missing the deadline.
Medicare late enrollment penalties are permanent — they follow you for the rest of your Medicare enrollment and compound over years into significant lifetime costs. A 2-year Part B delay creates a 20% premium increase every month for the rest of your life. Understanding every deadline prevents a mistake that cannot be undone.
Unlike most financial penalties, Medicare late enrollment penalties are permanent. They are added to your premium every month for the rest of your enrollment — there is no time limit after which they expire.
Part B Penalty — 10% Per Year, Forever
The Part B penalty is the most financially damaging for most seniors. If you don't enroll in Part B when first eligible (generally at 65) and you don't have qualifying employer coverage, you pay 10% extra on your Part B premium for every 12-month period you delayed.
| Delay | Penalty | Monthly Premium (2026) | Annual Extra Cost |
|---|---|---|---|
| 1 year | 10% | $223.20 | +$243/yr |
| 2 years | 20% | $243.50 | +$487/yr |
| 5 years | 50% | $304.40 | +$1,217/yr |
Part D Penalty — 1% Per Month, Forever
The Part D penalty applies if you go 63+ consecutive days without creditable drug coverage after your Initial Enrollment Period ends. The penalty is calculated as: number of months without coverage × 1% × national base premium ($38.99 in 2026), rounded to the nearest $0.10, added to your monthly Part D premium permanently.
A 24-month gap = 24% penalty = approximately $9.40/month extra. Over 20 years of retirement, that's roughly $2,250 in extra premiums for a delay of just 2 years.
The Exception: Employer Coverage
If you're still working at 65 and covered by your employer's health plan (or your spouse's), you can delay Medicare Parts B and D without penalty — as long as the employer coverage is considered "creditable." When you eventually retire or lose that coverage, you have an 8-month Special Enrollment Period for Part B and a 63-day window for Part D — both with no penalty.
Critical: COBRA and marketplace coverage after leaving employer insurance do NOT qualify as creditable coverage for avoiding penalties. Your 8-month SEP for Part B begins when the employer coverage ends — not when COBRA ends.
Key Enrollment Deadlines
Initial Enrollment Period (IEP): 7-month window — 3 months before your 65th birthday month, your birthday month, and 3 months after. Enroll in Parts A and B during this window to avoid penalties.
General Enrollment Period (GEP): January 1–March 31 each year — for those who missed IEP. Coverage starts July 1. You pay the penalty from the missed IEP date.
Special Enrollment Period (SEP): 8 months after losing employer coverage — no penalty. Must prove prior creditable coverage.
- Mark your 65th birthday on your calendar — your IEP begins 3 months before
- If working past 65, get a written Notice of Creditable Coverage from your employer
- When you leave employer coverage, enroll in Part B within 8 months — not when COBRA ends
- Keep all creditable coverage documentation — you may need it years later to dispute a penalty
- COBRA does not protect you from Part D penalty — enroll in Part D within 63 days of losing employer drug coverage
→ Medicare Parts A–D — Complete Overview
→ Medigap Enrollment Timing Guide
→ Lower Your Medicare Costs