You don't have to enroll in Medicare at 65, but waiting can cost you money in penalties for the rest of your life

Medicare enrollment at 65 is not automatic or mandatory. You can delay it. However, if you delay beyond your Initial Enrollment Period — which runs from three months before your 65th birthday through three months after — you will owe a permanent penalty on your monthly premiums. The penalty amount depends on how long you waited and which parts of Medicare you delayed. For most people, the financial cost of waiting outweighs any benefit, but there are specific situations where delaying makes sense.

The key exception is if you are still working and covered by your employer's health plan. If your employer has 20 or more employees, you can delay Medicare without penalty as long as you are actively employed and covered by that plan. Once you leave that job or lose that coverage, you have eight months to enroll in Medicare without penalty — this is called your Special Enrollment Period.

Key Takeaways

  • You can delay Medicare past 65, but you will pay a permanent penalty on Part B and Part D premiums for every year you waited, unless you had employer coverage.
  • If you are still working and your employer has 20 or more employees and covers you, you can delay Medicare without penalty until you leave that job.
  • Your Initial Enrollment Period is three months before your 65th birthday through three months after — missing this window triggers penalties unless you may have access to for a Special Enrollment Period.
  • Part A (hospital insurance) rarely carries a penalty because most people do not pay a premium for it, but delaying Part B and Part D will cost you permanently.

How the penalty works and what it costs

The Part B penalty is 10 percent of the standard monthly premium for each full year you delayed enrollment past your Initial Enrollment Period. If you waited three years, you pay 30 percent more than the standard premium for the rest of your life. In 2024, the standard Part B premium is $164.90 per month, so a three-year delay would add roughly $49 per month permanently to your bill. That penalty does not go away if you eventually enroll.

The Part D penalty (prescription drug coverage) works the same way: 1 percent of the national average premium for each month you delayed. If you waited 12 months, you owe 12 percent more on your drug plan premium forever. This penalty applies only if you go without creditable drug coverage — meaning coverage as good as Medicare's — during the months you were not enrolled.

Part A (hospital insurance) usually has no premium if you or your spouse paid Medicare taxes for at least 10 years, so there is typically no penalty for delaying it. However, if you do owe a premium for Part A, the penalty is 10 percent per year, the same as Part B.

When delaying Medicare makes financial sense

Delaying is most practical if you are still working and your employer's health plan covers you. Your employer plan becomes your primary insurance, and Medicare becomes secondary. You do not need to enroll in Medicare while you are covered this way. When you leave your job or lose that coverage, you have eight months to enroll without penalty.

Some people also delay if they are still working, earning income, and do not yet need the coverage. However, this strategy is risky: if you miss your Initial Enrollment Period and do not have employer coverage to protect you, the penalty is permanent. The only way to avoid the penalty after missing your Initial Enrollment Period is to prove you had creditable coverage (coverage as good as Medicare) during the months you were not enrolled in Medicare.

If you are not sure whether your employer plan qualifies as creditable coverage, ask your employer's benefits department or your plan administrator directly. They can tell you whether your plan meets Medicare's standards. Keep documentation of this coverage in case you need it later to avoid or reduce a penalty.

What happens if you miss your enrollment window

If you pass your Initial Enrollment Period without enrolling and you do not have a may have access to reason (like employer coverage), you will have to wait until the next General Enrollment Period, which runs January 1 through March 31 each year. Your coverage would not start until July 1 of that year. During the months between when you turned 65 and when your coverage starts, you have no Medicare protection and will owe the permanent penalty once you do enroll.

The only way to avoid the penalty after missing your Initial Enrollment Period is to show you had creditable coverage during the gap. Creditable coverage means coverage that is at least as good as Medicare — this can be an employer plan, TRICARE (military coverage), the Veterans Health Administration, or certain other plans. You will need to provide proof of this coverage to Medicare when you enroll late.

How to enroll if you decide to move forward

You can enroll in Medicare through several routes. The easiest is online at Medicare.gov, where you can create an account and submit your enrollment information. You can also call 1-800-MEDICARE (1-800-633-4227) and speak with a representative who can walk you through the process. If you prefer in person, you can visit your local Social Security office.

You will need your Social Security number and information about any current health coverage you have. If you are still working and covered by an employer plan, tell Medicare that when you enroll — it will affect which parts you need to enroll in and when your coverage starts. Enrollment typically takes a few minutes online or by phone, and your coverage usually starts the first day of the month after you enroll.

Special situations: working past 65 or part-time work

If you are self-employed or work part-time, the employer coverage exception does not explore to you automatically. You are generally required to enroll in Medicare at 65 even if you are still working. However, if you have health coverage through a spouse's employer plan and that employer has 20 or more employees, you may be able to delay based on that coverage instead.

If you are unsure whether your work situation qualifies you for a delay, contact Medicare directly at 1-800-MEDICARE. They can review your specific circumstances and tell you whether you can delay without penalty. It is better to ask before you miss your enrollment window than to discover later that you owe a permanent penalty.

Medicare parts and what each one covers

Part A covers hospital stays, skilled nursing facility care, hospice, and some home health services. Part B covers doctor visits, outpatient care, and preventive services. Part D covers prescription drugs. Part C (Medicare Advantage) is an alternative to Parts A and B offered by private insurers — if you choose Part C, you do not enroll in Parts A and B separately.

You do not have to enroll in all parts at once. However, if you delay Part B or Part D past your Initial Enrollment Period and do not have creditable coverage, you will owe a penalty. Part A typically has no penalty because there is usually no premium. Understanding which parts you need depends on your health, your current coverage, and your income.

Frequently Asked Questions

Can I delay Medicare and keep my employer coverage?

Yes, if your employer has 20 or more employees. You can stay on your employer plan and delay Medicare without penalty. Once you leave that job or lose coverage, you have eight months to enroll in Medicare without penalty. After those eight months, you will owe a permanent penalty if you enroll late.

What if I turn 65 but do not want Medicare yet?

You can decline Medicare, but only if you have creditable coverage through an employer plan or another source. If you do not have creditable coverage and you do not enroll during your Initial Enrollment Period, you will owe a permanent penalty when you eventually enroll. The penalty applies to Part B and Part D for every year you delayed.

Do I have to enroll in Part D if I do not take prescription drugs?

You do not have to enroll in Part D if you do not take medications. However, if you enroll in Part D later, you will owe a penalty for every month you were not enrolled, unless you had creditable drug coverage from another source during that time. If you think you might need drugs in the future, enrolling now avoids the penalty.

What is the penalty if I wait two years to enroll in Medicare?

For Part B, a two-year delay costs you 20 percent more on your monthly premium for life. For Part D, it costs 24 percent more (2 percent per month). These penalties are permanent and do not decrease over time, so the longer you wait, the more you pay in total over your lifetime.

Can I enroll in Medicare Part A only and skip Part B?

Yes, you can enroll in Part A without Part B. However, if you later want Part B and you are not still working with employer coverage, you will owe the Part B penalty. Part A usually has no premium, so there is no penalty for delaying it, but Part B does carry a penalty if you delay past your Initial Enrollment Period.