Do You Have to Sign Up for Medicare at 65 If You’re Still Working? (2026 Update)
Introduction
Turning 65 is a major milestone and for most Americans, it also means making important Medicare decisions. But what if you’re still working and covered by an employer health plan? Do you really need to sign up for Medicare right away?
The answer depends on the size of your employer, your family coverage situation, and your financial plans (like Health Savings Accounts). Let’s break it down using the updated 2026 Medicare numbers so you can make an informed choice.
TL;DR:
- If you work for a small employer (19 employees or fewer) or are on an ACA plan, you must sign up for Medicare at 65.
- If you work for a large employer (20+ employees), you don’t have to enroll yet — but it’s worth comparing costs between your employer coverage and Medicare.
- Be careful with HSA contributions: once you’re on Medicare Part A or B, you can no longer contribute.
- If your spouse or children rely on your employer plan, joining Medicare could affect their coverage.
- 2026 costs: Part B Premium ≈ $206.50/month, Deductible ≈ $288; Part D base premium ≈ $38.99, Deductible up to $615, out-of-pocket threshold ≈ $2,100.
When You Must Enroll in Medicare at 65
If you are still working at 65 and your employer has 19 or fewer employees, Medicare rules require you to sign up for Part A and Part B. That’s because Medicare becomes your primary coverage in this situation.
Similarly, if you’re enrolled in an ACA marketplace plan, you must move to Medicare at 65. The ACA coverage won’t act as primary insurance once you’re eligible for Medicare, and you could face penalties if you delay.
When You Can Delay Medicare
If you (or your spouse) are covered by a large employer plan (20+ employees), you’re not required to sign up for Medicare right away. The employer plan stays primary, and Medicare would be secondary if you did enroll.
In this case, you have a choice:
- Stay on your employer plan until you retire.
- Compare costs between Medicare and your employer plan to see which is more affordable.
For 2026, here’s what Medicare looks like:
- Part B premium: ≈ $206.50/month
- Part B deductible: ≈ $288
- Part D base premium: ≈ $38.99/month
- Part D maximum deductible: ≈ $615
- Part D out-of-pocket threshold (catastrophic coverage): ≈ $2,100
Depending on your employer’s premium and coverage, switching to Medicare may save you money — or it may not.
Special Considerations
Health Savings Accounts (HSAs)
If you’re still contributing to an HSA, you need to be careful. Once you enroll in any part of Medicare (A or B), you can no longer contribute to your HSA. This often makes it better to delay Medicare if you want to maximize your tax-advantaged savings.
Coverage for Your Family
If your spouse or children rely on your employer’s plan, switching yourself to Medicare could leave them without affordable coverage. Employer plans often won’t cover family members once the employee leaves for Medicare. In this case, it may be better to stay with your employer plan until your family’s needs are met.
Frequently Asked Questions
Only if you fail to enroll when required. As long as you’re covered by a large employer plan (20+ employees), you can delay without Penalty.
Yes. Many people choose Medicare if it’s cheaper or provides better coverage. Just compare the costs before deciding.
You’ll have an Special Enrollment Period to sign up for Medicare without penalties once your employer coverage ends.
Conclusion
Whether or not you need to enroll in Medicare at 65 depends mostly on your employer size and your family/financial situation.
- Small employer or ACA plan? You must enroll at 65.
- Large employer plan? You can delay, but compare costs first.
- HSA users or families on your plan? Think carefully before making changes.
With Medicare costs rising again in 2026 — Part B premiums nearing $206.50/month and Part D deductibles up to $615 — it’s more important than ever to review your options carefully.
⚠️ Disclaimer: This article is for educational purposes only. Medicare rules are complex, and situations vary. Always confirm your options with Medicare or a licensed insurance professional before making decisions.
Michael Quinn is a seasoned Medicare insurance expert and licensed agent dedicated to simplifying the complexities of healthcare coverage. With over a decade of experience, he is a trusted advisor known for his compassionate guidance and commitment to empowering individuals. As the Cofounder of REMEDIGAP in 2013, Michael offers unbiased resources and personalized support to assist clients in making informed decisions.
His expertise has been recognized on reputable platforms such as USA Today and Nerdwallet, solidifying his reputation as a reliable and knowledgeable industry leader. With a Master's Degree in Communicative Disorders, Michael combines strong communication skills with a genuine passion for positively impacting lives through tailored insurance solutions.
Written by Michael Quinn
Licensed Broker, REMEDIGAP Founder
Fact Checked by Joann Quinn
Chief Compliance Officer
As a licensed insurance broker, REMEDIGAP upholds the principles of integrity in our editorial standards and ensures transparency in how we receive compensation from our insurance partners.
