Medicare Part B Late Enrollment Penalty Calculator
If you don't sign up for Medicare Part B when you're first eligible and you don't have qualifying employer coverage, you may face a permanent premium penalty. Understanding this penalty before you make enrollment decisions can save you thousands of dollars over your lifetime.
The Part B late enrollment penalty is 10% for each full 12-month period you were eligible for Part B but chose not to enroll, added permanently to your monthly premium. For example, if you delayed two years without creditable coverage, your Part B premium would be 20% higher for as long as you have Medicare.
Use the calculator below to estimate your potential penalty. If you're still working and covered by an employer plan, you may qualify for a Special Enrollment Period (SEP) that lets you delay Part B without penalty. Contact Scott to verify your specific situation before making any enrollment decisions.
Frequently Asked Questions
How is the Part B late enrollment penalty calculated?
The penalty is 10% of the standard Part B premium for each full 12-month period you went without Part B and didn't have creditable employer coverage. In 2025, the standard premium is $185.00/month. A 2-year delay adds 20% ($37/month), making your premium $222.00/month — permanently.
Is the Part B penalty really permanent?
Yes. Unlike some other penalties, the Medicare Part B late enrollment penalty stays with you for as long as you have Part B. It is recalculated each year based on the new standard premium, so your penalty amount in dollars may increase even though the percentage stays the same.
What qualifies as creditable coverage that avoids the penalty?
Active employer or union health coverage (where the employer has 20 or more employees) qualifies. Once that coverage ends, you have an 8-month Special Enrollment Period to sign up for Part B without penalty. COBRA and retiree health coverage do NOT qualify as creditable coverage for Part B purposes.
I'm turning 65 but still working — do I need to sign up for Part B?
Not necessarily, but it depends on your employer's size and your coverage. If your employer has 20+ employees and you're actively covered under their plan, you can delay Part B without penalty. If your employer has fewer than 20 employees, Medicare becomes primary and you should enroll in Part B. Always confirm with HR before delaying.
Can the Part B penalty be waived or reduced?
In rare circumstances, enrollment errors or misinformation from official sources may result in the penalty being waived. There is no standard appeal process to reduce the penalty simply because it's large. This is why it's critical to understand your enrollment windows before making decisions.
Have Questions? Talk to Scott.
Scott is a licensed Medicare broker in Eugene, Oregon. No sales pressure — just honest guidance.