Medicare Late Enrollment Penalty Calculator
Missing your Medicare enrollment window results in permanent premium penalties. Use this free tool to calculate exactly how much you will pay for Part B and Part D if you enroll late.
Medicare penalties are permanent. Unlike most financial penalties, Medicare late enrollment penalties are added to your premium for life — not just for a limited period. The best way to avoid them is to enroll on time. If you are unsure of your enrollment window, use our enrollment date calculator or speak with one of our agents.
Calculate Your Penalty
Enter the number of months you went without coverage to see your estimated penalty. Both calculators use 2026 premium rates.
How Medicare Penalties Work
- 10% added to your premium for every 12-month period you were eligible but did not enroll
- Applies if you do not have creditable employer coverage during the delay
- Penalty is permanent — it lasts for as long as you have Part B
- Calculated based on the standard premium at the time you enroll, then adjusted annually
- Example: 2 years late = 20% penalty = +$40.58/mo on top of standard premium (2026 rates)
- 1% of the national base beneficiary premium for each month without creditable drug coverage
- Applies if you go 63 or more consecutive days without creditable drug coverage
- Penalty is permanent — added to your Part D premium for life
- The dollar amount changes each year as the national base premium changes
- Example: 18 months late = 18% penalty = ~$6.62/mo added to your Part D premium (2026 rates)
How to Avoid Medicare Penalties
The good news is that Medicare penalties are entirely avoidable with proper planning. The most important step is knowing your enrollment window and acting within it.
If you are still working and covered by an employer group health plan, you may be able to delay Medicare enrollment without penalty. However, the rules are specific — retiree coverage, COBRA, and most marketplace plans do not count as creditable coverage for delaying Part B.
Our agents help hundreds of people each year navigate these decisions. A 15-minute conversation can save you hundreds of dollars per year in permanent penalties.
Calculate Your Enrollment DatesRelated Medicare Tools & Resources
Enter your birthday to find your exact enrollment window and coverage start date.
A full overview of Parts A, B, C, and D — eligibility, costs, and how they work together.
Answers to the most common Medicare questions, organized by topic.
Penalty Questions Answered
Not Sure If You Will Face a Penalty?
Our agents review your specific situation — your current coverage, your birthday, and your employment status — to tell you exactly when you need to enroll and how to avoid any penalties. The consultation is free.
Penalty estimates are based on 2026 standard premium rates. Actual amounts may vary. This tool is for informational purposes only and does not constitute legal or financial advice.