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Medicare Part B Late Enrollment Penalty: How to Avoid a Lifetime Surcharge

Missing your Medicare Part B enrollment window triggers a permanent premium penalty -- 10% for every 12-month period you were eligible but did not enroll. Here is how to avoid it.

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William Gray
••3 min read
Medicare Part B Late Enrollment Penalty: How to Avoid a Lifetime Surcharge

Medicare Part B Late Enrollment Penalty: How to Avoid a Lifetime Surcharge

The Medicare Part B late enrollment penalty is one of the most financially damaging mistakes a new Medicare beneficiary can make -- and it is entirely avoidable with proper planning. The penalty is permanent, lasting for as long as you have Medicare Part B.

How the Penalty Works

If you do not enroll in Medicare Part B when you are first eligible and do not have a qualifying exception, you pay a 10% premium surcharge for every 12-month period you were eligible but did not enroll.

Example: If you were eligible for Part B at 65 but didn't enroll until 68 -- a 3-year delay -- your penalty is 30%. The standard 2020 Part B premium is $144.60/month. With a 30% penalty, you pay $187.98/month -- an extra $43.38/month, every month, for the rest of your life.

Over 20 years, that 30% penalty costs more than $10,000 in extra premiums.

When You Are First Eligible

For most people, the Initial Enrollment Period (IEP) for Medicare Part B is a 7-month window:

  • 3 months before the month you turn 65
  • The month you turn 65
  • 3 months after the month you turn 65

If you do not enroll during your IEP and do not have a qualifying exception, the penalty clock starts.

The Major Exception: Employer Coverage

The most important exception to the Part B penalty is active employer coverage. If you (or your spouse) are actively working and covered by an employer group health plan from an employer with 20 or more employees, you can delay Part B without penalty.

Key rules:

  • The employer must have 20 or more employees
  • You must be actively employed (not retired with COBRA or retiree coverage)
  • When your employer coverage ends, you have an 8-month Special Enrollment Period to enroll in Part B without penalty

COBRA and retiree coverage do NOT count as qualifying employer coverage for purposes of avoiding the Part B penalty. If you retire and go on COBRA, you must enroll in Part B within your IEP or face the penalty.

Small Employer Exception

If your employer has fewer than 20 employees, Medicare is primary -- meaning Medicare pays first, and your employer plan pays second. In this case, you should enroll in Part B during your IEP even if you have employer coverage, because your employer plan may not pay claims that Medicare should have paid first.

The Special Enrollment Period After Employer Coverage Ends

When your qualifying employer coverage ends (or your employment ends), you have an 8-month Special Enrollment Period to enroll in Part B without penalty. This SEP begins the month after employment or employer coverage ends -- whichever comes first.

Important: Do not wait until your COBRA runs out to enroll in Part B. COBRA is not qualifying coverage for SEP purposes -- the 8-month SEP starts when your active employment ends, not when COBRA ends.

General Enrollment Period

If you miss both your IEP and your SEP, you can enroll during the General Enrollment Period (January 1-March 31 each year), with coverage beginning July 1. The late enrollment penalty applies.

Checking Your Penalty

If you're unsure whether you owe a penalty, contact Social Security (1-800-772-1213) or your local Social Security office. They can tell you your penalty amount and when it was assessed.

We do not offer every plan available in your area. Please contact Medicare.gov or 1-800-MEDICARE to get information on all of your options.

Explore Topics

#Part B Penalty#Late Enrollment#Medicare Enrollment#Medicare Costs

About the Author

William Gray — Independent Medicare Broker
FL #W690237

William Gray

Independent Medicare Broker

US Air Force Veteran · Florida Medicare Specialist

William Gray is an independent Medicare insurance broker based in Daytona Beach and Palm Coast, FL. A US Air Force veteran (A-10 crew chief, Germany), he spent years in corporate insurance before going independent to serve Florida seniors directly. He has helped more than 1,000 clients across Northeast Florida compare Medicare Advantage, Medigap, and Part D plans — always at no cost to the client.

FL License #W690237 — VerifiedAHIP Medicare Certified1,000+ Florida clients helped60+ carriers compared for every client5.0 stars — 60+ verified Google reviews
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We do not offer every plan available in your area. Any information we provide is limited to those plans we do offer in your area. Please contact Medicare.gov or 1-800-MEDICARE (TTY: 1-877-486-2048) to get information on all of your options.

Not affiliated with or endorsed by the U.S. government or the federal Medicare program. This is an advertisement for insurance. William Gray and affiliated licensed agents are independent insurance agents, not government employees or representatives. Medicare has neither reviewed nor endorsed this information.

Not all plans or types of coverage may be available in your area. Plan availability, benefits, and premiums vary by county and ZIP code. Enrollment in any plan depends on contract renewal. Benefits, premiums, and cost-sharing may change on January 1 of each year.

Independent Agent & Compensation Disclosure. William Gray is an independent licensed insurance agent (FL License #W690237) and is not employed by or exclusively affiliated with any single insurance company. William is compensated by insurance carriers when you enroll in a plan. This compensation does not affect the premium you pay — your premium is the same whether you enroll through a broker or directly with the carrier. Affiliated agents are independent contractors solely responsible for their own conduct and representations.

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