Should I Keep Employer Insurance When I Turn 65?
By Logan Steele · July 26, 2026 · 6 min read
Turning 65 doesn't automatically mean you should drop employer coverage and run to Medicare. For many people, staying on the employer plan for a few more years is the smarter financial move. For others, it's a costly mistake.
Here's how to decide whether to keep your employer plan at 65 — and how to do it without triggering a lifetime Medicare penalty.
Start with the employer-size test
The same 20-employee rule applies here. If your employer has 20 or more employees, the employer plan is primary and you can usually delay Part B safely. If your employer has fewer than 20, Medicare is primary and you generally need Part B at 65.
When keeping employer coverage makes sense
- Your employer pays most of the premium. A heavily subsidized group plan can be cheaper than Medicare plus Medigap plus Part D.
- You have dependents on the plan. Medicare only covers you; your family may need the employer coverage.
- Your doctors and drugs are well covered. If the network and formulary fit your needs, switching may not help.
- You plan to keep working for several years. There's no rush if your coverage is creditable and you're happy with it.
When Medicare is usually the better choice
- Your employer plan is expensive or has a narrow network.
- You see specialists not in the employer network.
- You plan to retire within 12–24 months. Switching earlier can avoid a rushed decision later.
- Your employer has under 20 employees. Medicare is primary, so you need Part B anyway.
How to keep employer coverage and stay penalty-free
If you delay Part B because you have creditable employer coverage, you must get two things right:
- Enroll in Part B during your 8-month Special Enrollment Period after employment or coverage ends.
- Keep your Part D creditable-coverage notice from HR — the one-page letter that proves your drug coverage was as good as Part D.
The HSA complication
If you enroll in any part of Medicare, you must stop contributing to a Health Savings Account. Part A can be backdated up to six months, so stop HSA contributions at least six months before you plan to enroll or file for Social Security.
- ✅ Confirm employer size in writing.
- ✅ Compare total annual cost: premiums + deductibles + copays + drugs.
- ✅ Check whether your doctors and drugs are in-network on both options.
- ✅ Plan your Part B enrollment date before you retire.
- ✅ Stop HSA contributions before enrolling in Medicare.
Educational only — not legal or tax advice. Employer size rules, HSA rules, and enrollment windows can change; confirm with HR, Social Security, or a licensed agent before acting.