Medicare Late Enrollment Penalties: How Much They Cost and How to Avoid Them

By Austin Tyler · Tyler Insurance Group · Updated July 2026

Most Medicare missteps can be corrected the following year. This is the rare one that cannot. Sign up late without the right kind of coverage, and Medicare can add a penalty to your premium for the rest of your life, one that slowly grows over time. The reassuring news is that these penalties are almost entirely avoidable once the rules are clear. Our team walks families through the two penalties that matter most (Part B and Part D), what they cost in 2026 with real numbers, who is safely exempt, and the simple steps that keep you from ever paying one.

First, why the penalty exists

Medicare works because healthy people join on time, not only when they get sick. To keep that fair, the rules reward signing up during your first window and charge a penalty to those who wait without a good reason. The phrase to remember is creditable coverage, which simply means other health or drug coverage at least as good as Medicare's. With it, the clock does not start. Without it, most months of waiting count against you.

The Part B late enrollment penalty

Part B covers doctors, outpatient care, and tests. Enroll late without creditable coverage from a current job, and the penalty is:

• 10% added to your Part B premium for each full 12-month period you could have had Part B but did not enroll.
• Paid for as long as you have Part B, which for most people means for life.
• Because it is a percentage of a premium that usually rises each year, the dollar penalty tends to grow over time too.

The standard Part B premium in 2026 is $202.90 a month. Here is how the penalty stacks on top of it.

A real example Frank retires at 65 with no other coverage but decides he "feels fine" and skips Part B. He finally enrolls three years later. That is three full 12-month periods, so his penalty is 30%. On the 2026 premium, 30% of $202.90 is about $60.87 extra every month, roughly $730 a year, added on top of his regular premium for the rest of his life. A three-year delay quietly became a lifelong bill.

 

 

The Part D late enrollment penalty

Part D is prescription drug coverage. Many people assume they can skip it because they "do not take many pills." That is the trap, because the penalty is based on how long someone goes without creditable drug coverage, whether or not they needed medicine during that time.

• The penalty is 1% of the national base beneficiary premium for each full month without Part D or other creditable drug coverage.
• The base premium used for the math is $38.99 in 2026. The penalty is rounded to the nearest 10 cents and added to the drug plan premium.
• Like Part B, it generally lasts as long as you have Part D coverage.
  
  

A real example Linda goes 26 months after becoming eligible without a drug plan and without other creditable coverage. Her penalty is 26% of $38.99, about $10.14, rounded to $10.10 a month. It does not sound like much, but it is permanent, it rises as the base premium rises, and she pays it on top of whatever drug plan she eventually chooses.

What about Part A?

Most people receive Part A (hospital coverage) for free because they or a spouse paid Medicare taxes for at least 10 years, and there is no penalty for something that costs nothing. A Part A penalty applies only to the small number of people who must buy Part A. For them, it is 10% added to the Part A premium, paid for twice the number of years delayed. For most retirees, this one never comes up.

The three penalties at a glance

Part	Penalty	How long you pay it
Part B	10% of the premium for each full year late	As long as you have Part B (usually life)
Part D	1% of $38.99 for each full month late	As long as you have Part D (usually life)
Part A	10% surcharge (only if you must buy Part A)	Twice the number of years you delayed

 

Who is exempt: the creditable coverage rule

There is no penalty for delaying Medicare as long as you had the right kind of coverage instead. The most common ways people stay penalty-free:

• You (or your spouse) are still working with employer coverage. If the job's health plan is creditable and the employer has 20 or more employees, you can usually delay Part B and Part D safely. When the job or coverage ends, a Special Enrollment Period allows sign-up for Part B within 8 months and Part D within 63 days, with no penalty.
• You have creditable drug coverage. Coverage from an employer, a union, or the VA that is at least as good as Part D keeps the Part D clock from starting. Keep the notice each year that confirms your coverage is creditable.
• You qualify for Extra Help. People who receive the Part D low-income subsidy do not pay the Part D late penalty.

The traps that cause most penalties

 

• Assuming Medicare enrolls you automatically. It does so only if you are already drawing Social Security. Otherwise you must sign up yourself.
• Thinking COBRA or retiree coverage counts as "current employer" coverage for Part B. It usually does not, and it does not create a Special Enrollment Period.
• Skipping Part D because you take few or no medications. The penalty is about time without coverage, not whether you filled a prescription.
• Waiting past the 8-month Part B window after a job ends, which can leave you stuck until the next General Enrollment Period, plus a penalty.

How to make sure you never pay one

Avoiding these penalties comes down to a few clear steps:

• Know your 7-month window. Your Initial Enrollment Period runs from three months before the month you turn 65 to three months after. With no other creditable coverage, enroll in this window.
• If you are still working, confirm your coverage is creditable in writing. Ask the benefits office and keep the letter. That paper is what protects you later.
• When employer coverage ends, act quickly. Sign up for Part B within 8 months and a Part D plan within 63 days. Do not wait for a gap to open.
• Do not leave a drug-coverage gap. Even for someone taking nothing today, a low-cost Part D plan or other creditable coverage stops the penalty clock.
• When in doubt, ask a licensed agent before deciding to wait. A five-minute check now can prevent a penalty that lasts decades.

 

The one thing to remember A late penalty is not a one-time fine. It is a surcharge added to your premium for life, and it grows as premiums rise. That is exactly why a quick conversation before turning 65, or before leaving a job with coverage, is worth so much.

 

Already have a penalty? Your options

Being told you owe a late penalty is not the end of the road, but it is worth acting on. A couple of paths may help:

• Ask for a reconsideration. If the penalty looks wrong (for example, you did have creditable coverage), you can appeal. For Part D you will receive a form to request a review, and proof of prior creditable coverage is the key.
• Check whether you qualify for Extra Help. If you now qualify for the Part D low-income subsidy, the Part D penalty goes away.

Either way, get the details right before responding, because the proof you provide is what makes the difference.

Prefer a local walk-through? Our Kentucky team breaks the same rules down for Bluegrass-area readers in their guide to Medicare late enrollment penalties .

 

Quick recap

• The Part B penalty is 10% of your premium for each full year you were late, added for life; on the 2026 premium of $202.90 that is real money every month.
• The Part D penalty is 1% of $38.99 for each full month without creditable drug coverage, and it is permanent too.
• "Creditable coverage," such as a current employer's plan, keeps the penalty clock from starting.
• When job coverage ends, you have 8 months for Part B and 63 days for Part D to enroll penalty-free, so act quickly.
• Do not skip Part D just because you take few pills, and check with a licensed agent before deciding to wait.

Common questions

How much is the Medicare Part B late enrollment penalty?

The Part B penalty adds 10% to the monthly premium for each full 12-month period you could have had Part B but did not sign up. In 2026 the standard Part B premium is $202.90, so a two-year delay (a 20% penalty) adds about $40.58 a month. You pay the penalty for as long as you have Part B, which usually means for life.

How is the Part D drug penalty calculated?

The Part D late penalty is 1% of the national base beneficiary premium ($38.99 in 2026) for each full month you went without Part D or other creditable drug coverage after becoming eligible. At 26 months late, that is 26% of $38.99, or about $10.10 a month, added to the drug plan premium for as long as you have Part D coverage.

Can Medicare late enrollment penalties ever go away?

Usually no. Both the Part B and Part D penalties are generally permanent and last as long as you keep that coverage. The amount can even rise over time, because it is a percentage of a premium that goes up most years. The exceptions are narrow, such as qualifying for the Part D Extra Help program or winning an appeal, so the safest plan is to avoid the penalty in the first place.

How do I avoid a Medicare late enrollment penalty if I am still working?

With creditable coverage from a current employer (yours or your spouse's), you can usually delay Part B and Part D without penalty. When that job coverage ends, a Special Enrollment Period gives you eight months to sign up for Part B and 63 days to join a Part D plan, penalty-free. Keep proof that the coverage was creditable, and enroll within those windows.

Do I get a penalty if I do not sign up for Medicare at 65?

Only if you had no other creditable coverage and no Special Enrollment Period. Still working at 65 with qualifying employer coverage? You can delay without penalty. But simply skipping enrollment with no creditable coverage starts the Part B and Part D penalties for every month you are late, and they follow you for life once you enroll.