Turning 65 doesn’t have to take you off your job’s health plan. I’m Michele Sanchez, owner of Michele Sanchez Insurance Agency, and I hear this question from people across Marco Island, Naples, and the rest of Collier County every year.
Whether you need Medicare while you’re still working past 65 depends on your employer’s size, the type of coverage you have, and a few tax rules that are easy to overlook.
This is a little different from your Initial Enrollment Period (IEP), the standard 7-month window built around turning 65. When you keep working past 65, the timeline for some parts of Medicare can shift.
Key Takeaways
- Whether you need Medicare while still working past 65 depends mainly on your employer’s size, not your age.
- If your employer has 20 or more workers, you can usually delay Part B without a penalty while that coverage continues.
- Once your employer coverage ends, you get an 8-month Special Enrollment Period to sign up for Part B without a late penalty.
- If you have an HSA, plan your contributions before you enroll in Part A.
Why Does My Employer’s Size Matter?
Your employer’s size is the main factor in whether you can delay Medicare. If your employer has 20 or more employees, its health plan generally pays first, which lets you put off Part B without a penalty. If your employer has fewer than 20 employees, Medicare generally pays first, which usually means you’ll want to enroll at 65 to avoid a gap in coverage.
| Your situation | Should you enroll at 65? | Who usually pays first? |
| Employer has 20+ workers | Usually no, you can delay Part B | Employer plan |
| Employer has fewer than 20 workers | Usually yes | Medicare |
| Self-employed or individual (non-group) plan | Usually yes | Medicare |
| Spouse’s employer has 20+ workers | Usually no | Employer plan |
The official name for this is the Medicare Secondary Payer (MSP) rule. The Centers for Medicare & Medicaid Services (CMS) uses them to decide whether Medicare or your employer’s plan pays first once you turn 65.
What If My Employer Has 20 or More Employees?
If your employer has 20 or more workers and you’re covered through your current job, you can generally delay Part B without a late penalty. Many people still sign up for Part A at 65 because most people don’t pay a premium for Part A after working 40 quarters.
You can keep delaying Part B until your job or your coverage ends, whichever comes first. After that, you have an 8-month Special Enrollment Period to sign up. If you sign up after that window closes, a late enrollment penalty may apply.
When you do enroll, you’ll also choose how your coverage is set up. One option is Original Medicare (Parts A and B) with a standalone Part D drug plan, often paired with a Medigap policy. Another is a Medicare Advantage plan (Part C), which often includes drug coverage and may include extras like dental and vision. I like to talk this through with my clients before their Special Enrollment Period starts, so the choice isn’t rushed.
What If My Employer Has Fewer Than 20 Employees?
If your employer has fewer than 20 workers, you’ll usually want to enroll in Part A and Part B at 65. Medicare generally pays first in this case, and your employer plan pays second, if it pays at all. Some small-employer plans may not cover certain claims if you haven’t enrolled in Medicare, so I recommend confirming this with your HR department.
It’s also a good idea to check your employer’s headcount with HR before you decide. Employer size can change from year to year.
What If I’m Covered Through My Spouse’s Job?
The same 20-employee rule applies when your coverage comes from a spouse who’s still working. If your spouse’s employer has 20 or more workers, you can typically delay Part B the same way an employee would. Some employers still require spouses to enroll in Medicare at 65 to stay on the plan, so please confirm the rule with the plan’s benefits administrator.
What If I’m Self-Employed and Still Working Past 65?
If you’re self-employed, your coverage usually doesn’t count as a group health plan based on current employment, which is what Medicare looks for when determining whether you can delay Part B. This often applies to people with an ACA Marketplace plan, since Marketplace coverage isn’t employer group coverage. In most of these cases, enrolling in Medicare at 65 helps you avoid a Part B penalty later. If you’re unsure how your plan is treated, ask your insurance company or give me a call and we’ll look at it together.
Do COBRA, VA Benefits, and TRICARE Let Me Delay Medicare?
These types of coverage work differently from active employer coverage. If one of them is your only coverage, it’s usually worth signing up for Medicare at 65.
COBRA: COBRA doesn’t let you delay Part B without a penalty. Your 8-month Special Enrollment Period starts when your job or active coverage ends, not when COBRA ends.
VA benefits: VA health care on its own doesn’t give you a Special Enrollment Period for Part B. Many veterans enroll in Part B at 65 to keep their options open.
TRICARE: If you have TRICARE and qualify for premium-free Part A, you generally need Part B to keep your TRICARE coverage (TRICARE For Life).
How Can Medicare Affect My HSA?
If you sign up for Part A after 65 or apply for Social Security after 65, your Part A coverage can backdate up to 6 months (but not earlier than the month you turned 65). HSA contributions made during those backdated months may count as excess contributions under IRS rules, and excess contributions can be subject to a 6 percent tax each year until they’re corrected.
Here’s an example. Say you keep working until 67 and apply for Social Security in September. Your Part A coverage backdates 6 months, to March. HSA contributions you made from March onward would be excess contributions.
Many people plan for this by stopping HSA contributions about 6 months before they enroll in Part A. Because everyone’s tax situation is different, I also suggest checking with your tax advisor.
How Does Delaying Part B Affect My Medigap Window?
Your one-time Medigap Open Enrollment Period starts the first month you have Part B and are 65 or older, not simply the month you turn 65. During these 6 months, insurers can’t deny you a Medigap policy or charge you more because of your health history. If you delay Part B while working, this window moves with it. After it closes, insurers may use medical underwriting unless you qualify for certain guaranteed-issue rights.
This is why I like to review the timing with clients before they enroll in Part B. Looking at your timeline ahead of time can help you keep your Medigap options open.
How Much Could a Late Enrollment Penalty Cost?
If you delay Part B without qualifying employer coverage, Medicare adds 10 percent to your Part B premium for each full 12-month period you went without it. In most cases, that penalty stays for as long as you have Part B.
According to the Centers for Medicare & Medicaid Services, the. So one full year of delay without qualifying coverage adds about $20.29 a month to your premium. 2026 standard Part B premium is $202.90 a month
Part D is separate. If you go 63 days or more without Part D or other creditable drug coverage after your IEP ends, a Part D late penalty may apply. Many employer plans send a yearly notice telling you whether your drug coverage is creditable, so it’s worth keeping that letter.
How Do I Enroll in Medicare While Still Working?
1. Apply online at SSA.gov. Most people find this the most convenient option.
2. Call Social Security at 1-800-772-1213 if you’d rather apply by phone.
3. Visit your local Social Security office if you’d like someone to go through your documents with you.
Have your Social Security number, proof of age, and current employer coverage details ready before you start. If you’re enrolling during a Special Enrollment Period after leaving a job, Social Security will also ask for proof of your employer coverage (Form CMS-L564, which your employer completes).
Can I Get Help Reviewing My Situation?
Each rule above has exceptions, and your employer, your spouse’s plan, or your HSA may affect which ones apply to you. When we talk, I’ll go over your employer size, your coverage, and your timeline so you have the information you need before you decide.
If you’re on Marco Island or looking for a Medicare agent in Naples, FL, I’m happy to go over this with you. Please call me at (239) 682-8567. There’s no cost to you for my assistance.
For the broader rules on Medicare timing, you can read my Medicare guide, or browse my Medicare Basics post for an overview of Parts A through D. My education center has more enrollment walkthroughs as well.
Frequently Asked Questions
Can I wait to sign up for Medicare if I’m still working?
Yes, if you have coverage through your current job or your spouse’s current job at an employer with 20 or more workers. You then get an 8-month Special Enrollment Period once that job or coverage ends.
What coverage lets me delay Part B without a penalty?
Group health coverage based on current employment, yours or your spouse’s, generally lets you delay Part B without a penalty. COBRA, retiree coverage, VA benefits alone, and individual plans generally don’t.
Does COBRA count as coverage for delaying Part B?
No. If you have COBRA, it’s usually best to sign up for Part B during your 8-month Special Enrollment Period, which starts when your job ends, so you can avoid a Part B penalty.
Will I be penalized if I don’t sign up at 65?
Only if you don’t have qualifying coverage. Without it, Medicare adds 10 percent to your Part B premium for each full 12 months you went without Part B, and in most cases that penalty stays for as long as you have Part B.
Does my spouse’s employer coverage let me delay Medicare too?
Usually yes, if the employer has 20 or more workers. Some employers still require spouses to enroll at 65, so it’s best to confirm with the benefits administrator.
Does Medicare Part A start automatically if I am still working at 65?
It does if you’re already collecting Social Security retirement benefits when you turn 65, even if you keep your job-based plan. If you’re not collecting Social Security yet, you’ll need to sign up for Part A yourself. For most people, Part A is premium-free.
What if my employer offers a retiree health plan instead of an active employee plan?
Retiree coverage works differently from an active employee plan and generally doesn’t let you delay Part B without a penalty. Most retiree plans expect you to enroll in Medicare at 65 and then pay second. I recommend checking with your plan administrator before you decide to wait.
Warmly,
Michele Sanchez
