Can I Delay Medicare Part B If Still Working?

Can I Delay Medicare Part B If Still Working? Understanding Enrollment Rules While Employed Past 65

The Short Answer: Yes, Most of the Time

Yes, you can often delay Medicare Part B if you are still working. But there is a big “if.” You need the right kind of health insurance from your job. If you get this wrong, you could pay a penalty for the rest of your life.

I know that sounds scary. When I first looked into this topic, I felt lost too. Medicare has a lot of rules, and many of them use hard-to-understand words. So I wrote this guide to simplify it.

In this article, I will walk you through:

1. What Medicare Part B is and when you can first sign up
2. The “20-employee rule” that decides if you can safely wait
3. Times when you should NOT delay Part B
4. How the late penalty works and how to avoid it
5. How to sign up later when you finally stop working
6. Special cases, like HSAs, spouse coverage, and COBRA
7. Answers to the most common questions people ask

By the end, you will know if delaying Part B makes sense for you. You will also know the exact steps to take so you don’t get hit with a penalty.

One quick note before we start. I am not a lawyer or a licensed insurance agent. This guide is for learning. Rules can change, and every person’s case is a little different. Before you make a final choice, I recommend you talk to Social Security, your employer’s benefits office, or your State Health Insurance Assistance Program (SHIP). SHIP counselors give free, unbiased Medicare help in every state.

Medicare Basics: What Is Part B?

Medicare is federal health insurance. It is mainly for people who are 65 or older. It has several parts, and each part covers different things.

Here is a quick look at the main parts:

• Part A (hospital insurance): Covers hospital stays, skilled nursing care, and hospice. Most people pay no monthly premium for Part A because they paid Medicare taxes while working.
• Part B (medical insurance): Covers doctor visits, outpatient care, lab tests, preventive care, and medical equipment like walkers.
• Part C (Medicare Advantage): A private plan that bundles Parts A and B, and often D. You must have Part A and Part B to join one.
• Part D (drug coverage): Helps pay for prescription drugs.

Why Part B Costs Money

Unlike Part A, Part B has a monthly premium for almost everyone. In 2026, the standard Part B premium is $202.90 per month. The yearly deductible is $283. People with higher incomes pay more. This extra charge is called IRMAA, and in 2026 it starts for single people earning over $109,000 or married couples earning over $218,000.

That is more than $2,400 a year for the standard premium alone. So it makes sense that people ask, “Why pay for Part B if my job already gives me good health insurance?”

When You First Can Sign Up

Your first chance to sign up is called your Initial Enrollment Period (IEP). It is a 7-month window:

1. It starts 3 months before the month you turn 65.
2. It includes the month you turn 65.
3. It ends 3 months after the month you turn 65.

For example, if you turn 65 in June, your window runs from March through September.

If you already get Social Security checks when you turn 65, Medicare automatically signs you up for Parts A and B. Your card shows up in the mail. If you are still working and don’t want Part B yet, you can decline it. I will explain how later.

The Key to Delaying: The 20-Employee Rule

The most important question is this: How many people work for your employer? The answer decides whether Medicare or your job plan pays your bills first.

When you have two kinds of insurance, one pays first. That one is called the primary payer. The other pays second, and it is called the secondary payer. The secondary payer covers only what’s left over.

If Your Employer Has 20 or More Employees

This is the good news case. If your company has 20 or more workers, your job plan pays first. Medicare would only pay second.

That means you can usually delay Part B with no penalty. Your job plan does the heavy lifting, so there is little reason to pay $202.90 a month for Part B.

To be safe, all of these should be true:

• You (or your spouse) are actively working at the job.
• The health plan comes from that current job.
• The employer has 20 or more employees.

If Your Employer Has Fewer Than 20 Employees

This is where people get into trouble. If your company has fewer than 20 workers, Medicare usually becomes the primary payer once you turn 65. Your job plan only pays second.

Here is why that matters. Many small-company plans expect you to have Part B. If you skip it, the plan may pay only the small amount it would have paid as a backup. You could end up paying most of the bill for a doctor visit or surgery.

So if you work for a small employer, you should usually sign up for Part B when you turn 65. Ask your benefits person in writing how the plan works with Medicare.

Quick Check: Can I Safely Delay?

What If I Have a Disability and Am Under 65?

The rule is a little different for people under 65 who get Medicare because of a disability. In that case, the employer needs 100 or more employees for the job plan to pay first. If your company is smaller, Medicare usually pays first.

When You Should NOT Delay Part B

Delaying Part B is not right for everyone. In some cases, waiting can cost you a lot of money. Here are the times I would sign up for Part B on time:

1. Your employer has fewer than 20 workers. As I explained above, Medicare pays first, so you need Part B to be fully covered.
2. You have COBRA. COBRA lets you keep your old job plan after you leave. But it does NOT count as coverage from current work. Time on COBRA will not protect you from the late penalty.
3. You have retiree health coverage. Retiree plans usually pay second to Medicare. Most expect you to have Parts A and B.
4. You have a Marketplace plan. If you buy insurance on HealthCare.gov or a state exchange, that plan does not let you skip Part B safely. You also may lose any premium tax credits once you qualify for Medicare.
5. You are self-employed with an individual plan. An individual plan is not group coverage from a job. It won’t protect you from the penalty.
6. You have VA health benefits only. VA care is great at VA facilities, but it does not count as job-based coverage for Part B. If you see doctors outside the VA, you may want Part B.
7. Your job plan tells you to enroll. Some plans, even at large companies, ask you to get Medicare at 65. Always read your plan rules.

A Story That Shows Why This Matters

Let me share a simple example. Imagine a man named Tom. He retired at 64 and went on COBRA. He thought COBRA was the same as his job plan, so he skipped Part B at 65. Two years later, his COBRA ran out.

When Tom tried to sign up for Part B, he found out two bad things. First, he had to wait for the General Enrollment Period. Second, he owed a lifetime late penalty. If Tom had signed up at 65, none of this would have happened.

The Part B Late Penalty, Explained Simply

If you don’t sign up for Part B when you are supposed to, you may owe a late enrollment penalty. This is what worries most people, and for good reason.

Here is how it works:

• You pay an extra 10% of the standard premium for each full 12 months you went without Part B (when you should have had it).
• The penalty is added to your monthly premium.
• In most cases, you pay it for as long as you have Part B. That usually means for life.

Penalty Example

Say you went 2 full years without Part B and without job coverage that counts. Your penalty would be 20% of the standard premium. With the 2026 premium of $202.90, that is about $40.58 extra each month. That adds up to almost $487 a year, every year. And because the premium goes up most years, the penalty grows too.

The good news is simple: if you delay Part B because you have job-based coverage through your current job, you will not owe this penalty. You need to sign up at the right time later.

Your Special Enrollment Period: How to Sign Up Later

When you finally stop working, or your job coverage ends, you get a Special Enrollment Period (SEP). This lets you sign up for Part B without a penalty.

Here are the key facts:

• The SEP lasts 8 months.
• It starts the month after your job ends or your job coverage ends, whichever comes first.
• You can also sign up any time while the job plan still covers you.

That “whichever comes first” part trips up a lot of people. If you quit in March but keep COBRA until December, your 8 months start in April, not January. Don’t wait for COBRA to run out.

My Advice: Don’t Use All 8 Months

Even though you have 8 months, I suggest you sign up before your job coverage ends. That way, there is no gap. Part B can start the first day of the month after your job plan stops.

What If I Miss My Special Enrollment Period?

If you miss it, you will have to use the General Enrollment Period. It runs from January 1 to March 31 each year. Your coverage starts the month after you sign up. You may also owe the late penalty, and you could go months without coverage.

The Two Forms You Need

To sign up for Part B later, you usually need two forms:

1. CMS-40B (Application for Enrollment in Medicare Part B). This is the main sign-up form.
2. CMS-L564 (Request for Employment Information). Your employer fills this out. It proves you had job coverage so that you won’t get a penalty.

You can send these to Social Security online, by fax, by mail, or in person. If your employer won’t fill out the CMS-L564, you can use other proof, like pay stubs or tax forms showing health premiums. Keep copies of everything.

Special Cases You Should Know About

Should I Still Sign Up for Part A?

For most people, yes. Part A is usually free, so many people sign up at 65 even while working. It can act as backup hospital coverage.

But there is one big exception: the Health Savings Account (HSA). Read the next part before you sign up for Part A.

What If I Have an HSA?

If you have a high-deductible health plan with an HSA, be careful. Once you have any part of Medicare, including Part A, you can no longer contribute to your HSA. You can still spend the money already in it.

Here are the rules I want you to remember:

• If you are getting Social Security checks, you can’t turn down Part A. So you would have to stop HSA contributions.
• If you sign up for Medicare after 65, Part A coverage goes back up to 6 months (but not before the month you turned 65).
• Because of this, you should stop HSA contributions 6 months before you sign up for Medicare. Otherwise, you may owe a tax penalty.

What About My Spouse’s Coverage?

If your spouse’s job plan covers you, the same rules apply. The plan must come from your spouse’s current job, and the employer must have 20 or more workers. When your spouse retires or loses that coverage, your 8-month Special Enrollment Period begins.

What About Part D?

Part D has its own late penalty. If your job plan has drug coverage that is “creditable” (meaning it is at least as good as Medicare’s), you can delay Part D too. Your plan should send you a yearly letter saying whether its drug coverage is creditable. Save these letters.

Does Delaying Part B Affect Medigap?

Yes, and in a good way. Your 6-month Medigap Open Enrollment Period starts when you are 65 or older and enrolled in Part B. During this window, insurers can’t charge you more or turn you down because of health problems. If you delay Part B, you save this window for when you need it most.

My Step-by-Step Checklist

Here is the simple plan I would follow if I were still working at 65:

1. Count your employer’s workers. Ask HR if the company has 20 or more employees.
2. Ask HR in writing whether the plan pays first or second to Medicare.
3. Decide on Part A. Sign up if it’s free, unless you want to keep contributing to an HSA.
4. Check your drug coverage letter to see if it is creditable for Part D.
5. Turn down Part B if you were auto-enrolled. Follow the steps on the card’s letter, or call Social Security at 1-800-772-1213.
6. Mark your calendar a few months before you plan to retire.
7. Have your employer complete Form CMS-L564
8. Send in Form CMS-40B before your job coverage ends to avoid a gap.
9. Keep copies of every form, letter, and confirmation.

Frequently Asked Questions

Q: Can I delay Medicare Part B if I’m still working at 65?

A: Yes, if you have health coverage from your current job (or your spouse’s current job) and the employer has 20 or more workers. If the employer is smaller, you usually need Part B at 65.

Q: Will I pay a penalty if I delay Part B while working?

A: No, as long as your coverage comes from current work and you sign up within 8 months after the job or coverage ends.

Q: Does COBRA count as job coverage?

A: No. COBRA does not protect you from the Part B late penalty. Sign up for Part B when your job ends, not when COBRA ends.

Q: How do I turn down Part B if I was signed up automatically?

A: Follow the directions that come with your Medicare card, or contact Social Security. Do this before your Part B start date if you can.

Q: Can I sign up for Part B while I’m still working?

A: Yes. You can sign up any time while you have job-based coverage. Many people do this a month or two before they retire.

Q: What if my employer won’t fill out Form CMS-L564?

A: You can send other proof instead. Examples include pay stubs showing health premiums, W-2 forms, or insurance cards and statements.

Q: Can I join a Medicare Advantage plan if I delay Part B?

A: Not until you have Part B. You need both Part A and Part B to join a Medicare Advantage plan.

Q: Is delaying Part B a smart way to save money?

A: It can be. If your job plan pays first, you could save more than $2,400 a year in premiums. Just make sure your plan is as good as Medicare, and you follow the sign-up rules later.

Final Thoughts

So, can you delay Medicare Part B if you are still working? For many people, the answer is yes. If you have a job plan from a company with 20 or more workers, you can usually wait with no penalty. You can save money and keep the coverage you already know.

But the rules are strict. COBRA, retiree plans, Marketplace plans, and small-employer plans usually don’t let you wait safely. And if you miss your 8-month window, the penalty can last for life.

My best tip: get answers in writing. Talk to your HR team, call Social Security, or contact your local SHIP for free help. A few phone calls now can save you thousands of dollars later.

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