When Should You Enroll in Medicare if Still Working?
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Quick Answer
If your employer has 20+ employees and offers creditable coverage, you can safely delay Part B. If your employer has fewer than 20 employees, you must enroll in both Part A and Part B at 65 to avoid coverage gaps and penalties.
Coverage Comparison by Plan Type
| Plan Type | Coverage | Notes |
|---|---|---|
| Employer (20+ employees) | Primary | Group plan pays first, Medicare pays second. You may delay Part B. |
| Employer (<20 employees) | Secondary | Medicare pays first. You must enroll in Part A and Part B. |
| Self-Employed | Must Enroll | No group plan available; enroll at 65. |
| COBRA / Retiree Plan | Not Creditable | Does not count as active employer coverage. Enroll in Part B immediately. |
Understanding Your Coverage Options
Understanding Employer Coverage Coordination
When you have health insurance through your employer or your spouse's employer, that coverage must coordinate directly with Medicare. The size of the company is the most critical factor in this coordination.
If the employer has twenty or more employees, the group health plan pays first, and Medicare pays second. In this specific scenario, you might choose to delay Medicare Part B to save on monthly premiums.
However, if the company has fewer than twenty employees, Medicare pays first. You must enroll in both Part A and Part B to avoid massive gaps in your healthcare coverage.
Important: Company Size Matters
The 20-employee threshold determines whether your employer plan or Medicare is the primary payer. Getting this wrong can leave you with significant coverage gaps.
Medicare Enrollment Options While Working
You have several distinct choices when you turn sixty-five. You can enroll in both Part A and Part B, regardless of your current employment status.
Because Part A is premium-free for most individuals who have worked at least ten years in the United States, it is generally wise to enroll in Part A immediately. Part A covers inpatient hospital stays and skilled nursing facility care.
You can then decide to safely delay Part B, which covers outpatient medical services, if your current employer coverage is officially considered creditable.
Risks of Delaying Medicare Enrollment
Delaying your enrollment carries significant risks if you do not follow the strict rules set by the Centers for Medicare and Medicaid Services.
If you delay Part B without having creditable active employer coverage, you will face a permanent late enrollment penalty. This penalty increases your Part B premium by ten percent for every full twelve-month period you could have had Part B but did not sign up.
Additionally, you might experience a dangerous gap in your medical coverage while you wait for the next General Enrollment Period to open.
Late Enrollment Penalty
The Part B late enrollment penalty is permanent and increases your premium by 10% for each full 12-month period you could have had Part B but didn't enroll.
Medicare Enrollment Scenarios While Working
| Scenario | Part A | Part B | Penalty Risk |
|---|---|---|---|
| Employer 20+ employees | Enroll (free) | Can delay | None if creditable |
| Employer <20 employees | Enroll (free) | Must enroll | High if delayed |
| Self-employed | Enroll (free) | Must enroll | High if delayed |
| COBRA coverage | Enroll (free) | Must enroll | High if delayed |
| HSA contributor | Delay or stop HSA | Can delay | Tax penalty on HSA |
Health Savings Account Considerations
If you contribute to a Health Savings Account through a high-deductible health plan at work, you must be exceptionally careful. The Internal Revenue Service dictates that you cannot contribute to a Health Savings Account once you are enrolled in any part of Medicare, including the premium-free Part A.
To avoid tax penalties, you must stop all contributions to your account at least six months before you apply for Medicare or Social Security benefits.
Tips for Making the Right Enrollment Decision
To make the best choice, you should start planning several months before your sixty-fifth birthday. Speak with your human resources department to understand exactly how your current plan works with Medicare.
Once you decide to transition to Medicare, securing a Medicare Supplement plan is the premier way to protect your retirement finances. A Medicare Supplement plan steps in to pay the substantial deductibles and coinsurance that Original Medicare leaves behind.
Enrollment Decision Checklist
- •Confirm your employer's size (20+ or fewer than 20 employees)
- •Verify if your employer coverage is considered creditable
- •Check if you contribute to a Health Savings Account
- •Contact Social Security 3 months before turning 65
- •Compare your employer plan costs vs. Medicare + Medigap
- •Understand the Special Enrollment Period rules
✦ Frequently Asked Questions
David Haass
AuthorDavid Haass is the Chief Technology Officer and Co-Founder of Elite Insurance Partners and MedicareFAQ.com. He is a member and regular contributor to Forbes Finance Council.
Ashlee Zareczny
ReviewerAshlee Zareczny is the Director of Operations for MedicareFAQ. As a licensed Medicare agent in all 50 states, she is dedicated to educating those eligible for Medicare.