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The Part D penalty is permanent. Unlike some other Medicare late enrollment penalties, the Part D penalty is added to your premium for as long as you have drug coverage — it never disappears.
Part D Late Enrollment Penalty Calculator
2026 base premium: $38.99/month
Monthly Penalty
$4.70
Annual Penalty
$56.40
20-Year Total
$1,128
Months without coverage12 months
Penalty as % of base premium12%
Penalty calculation12 × 1% × $38.99
Formula: Monthly Penalty = months × 1% × $38.99 (2026 base premium), rounded to nearest $0.10.
The penalty is recalculated each year using the new base premium — it can increase over time.
The penalty is recalculated each year using the new base premium — it can increase over time.
Part D Penalty by Months Delayed (2026)
| Months Without Coverage | Monthly Penalty | Annual Penalty | 10-Year Cost |
|---|---|---|---|
| 6 months | $2.30 | $27.60 | $276 |
| 12 months | $4.70 | $56.40 | $564 |
| 18 months | $7.00 | $84.00 | $840 |
| 24 months | $9.40 | $112.80 | $1,128 |
| 36 months | $14.00 | $168.00 | $1,680 |
| 48 months (4 years) | $18.70 | $224.40 | $2,244 |
| 60 months (5 years) | $23.40 | $280.80 | $2,808 |
Understanding the Part D Late Enrollment Penalty
Medicare Part D prescription drug coverage is optional, but if you delay enrollment without having creditable coverage elsewhere, you'll face a permanent late enrollment penalty added to your monthly premium.
What Triggers the Penalty
The penalty clock starts the month after your Initial Enrollment Period (IEP) ends — typically the end of the third month after you turn 65. If you go 63 or more consecutive days without creditable coverage, the penalty applies when you do enroll.
What Counts as Creditable Coverage
- Most employer or union prescription drug plans
- TRICARE (military coverage)
- VA drug benefits
- Federal Employees Health Benefits (FEHB)
- Indian Health Service coverage
- PACE (Program of All-inclusive Care for the Elderly)
Your insurer must send you a "Notice of Creditable Coverage" each fall. Keep this letter — you may need it when you enroll in Part D.
Frequently Asked Questions
In limited cases, yes. If you can provide proof of creditable coverage for the disputed period (such as a Notice of Creditable Coverage letter), Medicare may recalculate your penalty. If your previous insurer failed to send required notices, you may have grounds to request a review. Contact your plan or CMS to request a reconsideration.
Yes. The penalty is recalculated each year based on the new national base beneficiary premium. If the base premium rises (it was $36.78 in 2025 and is $38.99 in 2026), your penalty rises proportionally. The number of months stays fixed, but the dollar amount changes annually.
Even if you currently take no medications, enrolling in a low-cost Part D plan during your IEP protects you from the penalty. Basic plans can cost as little as $0–$15/month. Given that the penalty is permanent, this is almost always the better financial choice.
Yes. Part B also has a late enrollment penalty of 10% of the standard premium for each full 12-month period you delay — also permanent. If you had employer coverage when you turned 65 and delayed Part B, you'll receive a Special Enrollment Period when that coverage ends, with no penalty. See our enrollment periods guide.
If your Medicare Advantage plan includes drug coverage (MAPD plan), you are enrolled in Part D and will not face the penalty. If your MA plan does not include drug coverage, you would need a standalone Part D plan to avoid the penalty.
Disclaimer: MedicareBudget provides Medicare cost calculators and educational information for informational purposes only. This is not medical advice, legal advice, or a substitute for licensed professional guidance. Always verify current figures at Medicare.gov or call 1-800-MEDICARE (1-800-633-4227). Contact: contact@medicarebudget.net