Medicare Part D Late Enrollment Penalty: How It’s Calculated (2026)

Skipping drug coverage when you first get Medicare can feel like a smart way to save money if you don’t take many prescriptions. But it can cost you for as long as you have Medicare drug coverage. Here’s how the Part D late enrollment penalty works.

I’m Michael Cubell, a licensed independent agent with Triangle Life & Health (licensed since 2013, NPN 16899969). I help people in 15 states sort through Medicare every day. Here’s the plain-English version.

When Does the Penalty Apply?

You may owe the penalty if, after your Initial Enrollment Period ends, you go 63 or more days in a row without either a Medicare drug plan (stand-alone Part D or a Medicare Advantage plan with drug coverage) or other creditable prescription drug coverage.

“Creditable” means the coverage is expected to pay at least as much as standard Medicare drug coverage. It can come from a current or former employer or union, TRICARE, the VA, or the Indian Health Service. Your plan must tell you each year whether its drug coverage is creditable. Keep that letter.

How the Penalty Is Calculated

Medicare multiplies 1% of the national base beneficiary premium by the number of full months you were eligible but went without coverage. The result is rounded to the nearest $0.10 and added to your monthly premium.

Example: 24 months without coverage

Year	Math	Monthly penalty
2026	24% × $38.99 = $9.36	$9.40 (rounded)
2027	24% × $41.33 = $9.92	$9.90 (rounded)

That’s on top of your plan premium, every month, for as long as you have Medicare drug coverage. Because the base premium can change each year, the penalty amount can go up or down. The percentage you owe doesn’t go away.

3 Ways to Avoid the Penalty

1. Enroll when you’re first eligible, even if you take few or no prescriptions. There are often low-premium plans available.
2. Add Part D within 63 days of losing other creditable coverage, like when you retire from a job with drug coverage.
3. Keep proof of creditable coverage and give it to your new plan when they ask. If you don’t, you could be charged a penalty you don’t actually owe.

Think the Penalty Is Wrong?

Your plan will send a letter if you owe a penalty. You can ask for a review (a “reconsideration”), generally within 60 days of the date on the letter, using the form that comes with it. Include proof of any creditable coverage you had.

Turning 65 soon? My Turning 65 Medicare checklist walks through every deadline. There’s a similar penalty for Part B, covered in Part B late enrollment penalty explained.

Frequently Asked Questions

How much is the Part D late enrollment penalty in 2026?

It’s 1% of the 2026 national base premium ($38.99) for each full month you went without creditable drug coverage, rounded to the nearest $0.10. For example, 24 months works out to $9.40 a month in 2026.

Is the Part D penalty permanent?

Generally, yes. You’ll pay it as part of your premium for as long as you have Medicare drug coverage. The amount is recalculated each year based on that year’s national base premium.

What counts as creditable drug coverage?

Drug coverage expected to pay at least as much as standard Medicare drug coverage. Examples include many employer and union plans, TRICARE, VA coverage, and Indian Health Service coverage. Your plan tells you each year whether it’s creditable.

Do I need Part D if I don’t take any medications?

If you don’t have other creditable drug coverage, it’s usually wise to enroll when you’re first eligible. Going without can lead to a lifelong penalty if you need drug coverage later.

Does Extra Help remove the Part D penalty?

Yes. People who qualify for Extra Help don’t pay the Part D late enrollment penalty.

Questions? Let’s Talk It Through

Retiring from a job with drug coverage? Let’s make sure there’s no gap. Call me at (919) 944-8443 or schedule a free consultation. No pressure, just straight answers.

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