You do not have to sign up for Medicare the moment you turn 65, but waiting can cost you money in penalties for the rest of your life

Medicare enrollment is not automatic, and you are not required to join the day you become may be able to access. However, if you delay past your Initial Enrollment Period — the seven-month window that starts three months before the month you turn 65 — you will owe a permanent penalty on your monthly premiums. The penalty grows larger the longer you wait, and it never goes away.

The main exception is if you have health insurance through your job or your spouse's job when you turn 65. In that case, you can delay Medicare without penalty, as long as you sign up within eight months of losing that coverage. If you do not have job-based coverage and you miss your Initial Enrollment Period, you will pay more for Medicare for as long as you have it.

Key Takeaways

  • Your Initial Enrollment Period is seven months long — three months before, the month of, and three months after the month you turn 65.
  • If you miss this window and do not have job-based health insurance, you will pay a permanent 10 percent penalty on Part B premiums and a permanent 1 percent penalty per month on Part D premiums.
  • Job-based coverage through your employer or spouse's employer lets you delay Medicare without penalty, but you must sign up within eight months of losing that coverage.
  • You can sign up for Medicare through Social Security, Medicare.gov, or by calling 1-800-MEDICARE.

What happens if you miss your enrollment window

If you do not sign up during your Initial Enrollment Period and you do not have job-based coverage, Medicare will charge you a late enrollment penalty on two parts of Medicare: Part B (doctor and outpatient care) and Part D (prescription drugs).

The Part B penalty is 10 percent of the standard monthly premium for each full year you were may be able to access but not enrolled. If the standard premium is $175 a month and you waited three years, you would pay an extra $52.50 per month for life. The Part D penalty is 1 percent of the national average premium for each month you were not enrolled. These penalties are added to your monthly bill and never decrease, even if you move to a different plan.

The only way to avoid these penalties is to have had creditable coverage — health insurance that is at least as good as Medicare Part B or Part D — during the time you were not enrolled. Job-based insurance, retiree coverage, TRICARE (military health coverage), or the Veterans Health Administration all count as creditable coverage.

When you can delay Medicare without a penalty

If you are still working and covered by your employer's health plan when you turn 65, you do not have to sign up for Medicare right away. The same applies if you are covered under your spouse's employer plan. You can stay on that coverage and delay Medicare without owing any penalty, as long as your employer has 20 or more employees.

Once you leave that job or lose the coverage for any reason, you have eight months to sign up for Medicare. This eight-month window is called your Special Enrollment Period. If you sign up within those eight months, you will not owe a late penalty. If you wait longer than eight months, the penalty clock starts ticking.

Tell your employer or your spouse's employer that you are declining Medicare coverage because you have job-based insurance. You may need to sign a form. This protects you by creating a record that you had creditable coverage, which is what Medicare will ask for if you ever need to prove you should not owe a penalty.

How to sign up during your Initial Enrollment Period

You have three ways to sign up for Medicare: through Social Security, through Medicare.gov, or by phone.

The easiest route for most people is to sign up through Social Security. If you are already receiving Social Security benefits, Medicare will contact you automatically about three months before you turn 65. If you are not yet receiving benefits, you can go to ssa.gov, create an account, and sign up for both Social Security and Medicare at the same time. You can also visit your local Social Security office in person.

You can also sign up directly at Medicare.gov. Create an account, answer questions about your health coverage history, and submit your information online. This takes about 10 minutes. If you prefer to speak with someone, call 1-800-MEDICARE (1-800-633-4227). The line is open Monday through Friday, 8 a.m. to 8 p.m. Eastern time. Have your Social Security number and information about any current health coverage ready.

Sign up during your Initial Enrollment Period even if you plan to delay Part A (hospital insurance). Signing up for Part B and Part D on time protects you from penalties later, and you can choose not to use them while you are still working.

What to do if you missed your enrollment window

If you missed your Initial Enrollment Period and you no longer have job-based coverage, you can still sign up, but you will owe a late penalty. The penalty is permanent and will be added to your monthly premium.

Sign up as soon as you realize you missed the window. Call 1-800-MEDICARE or visit Medicare.gov. Bring documentation of any health coverage you had during the time you were not enrolled in Medicare — this will not erase the penalty, but it may reduce it or prevent it from growing larger.

If you believe you have a good reason for missing the important date — such as a serious illness, a language barrier, or incorrect information from someone you trusted — you can ask Medicare to waive or reduce the penalty. This is called a waiver request. There is no may provide it will be approved, but it is worth asking. Medicare will review your situation and let you know within 30 days.

Part A versus Part B: different rules for each

Part A (hospital insurance) and Part B (doctor and outpatient care) have slightly different rules about when you must sign up.

Most people do not owe a premium for Part A because they or their spouse paid Medicare taxes while working. If you do not owe a premium for Part A, there is no penalty for signing up late. However, if you do owe a premium for Part A — which is rare — you will owe a 10 percent penalty for each year you delayed, just like Part B.

Part B always has a premium, and the late penalty applies if you miss your Initial Enrollment Period and do not have job-based coverage. If you are still working and covered by your employer's plan, you can delay Part B without penalty. Once you leave that job, you have eight months to sign up.

Frequently Asked Questions

Can I sign up for Medicare after I turn 65 if I missed my enrollment period?

Yes, you can sign up at any time. However, if you do not have job-based coverage and you missed your Initial Enrollment Period, you will owe a permanent late penalty on Part B and Part D. The longer you wait, the larger the penalty becomes.

What if I am still working and do not want Medicare yet?

If your employer's health plan covers you, you can delay Medicare without penalty. When you leave your job or lose that coverage, you have eight months to sign up. Make sure to tell your employer you are declining Medicare because you have job-based insurance.

Does my spouse have to sign up for Medicare when I do?

No. Your spouse has their own Initial Enrollment Period based on their own birthday. They should sign up during their seven-month window to avoid penalties. If your spouse is covered under your employer's plan, they can delay without penalty as long as the coverage continues.

What is the penalty if I wait too long to sign up?

The Part B penalty is 10 percent of the standard monthly premium for each full year you delayed. The Part D penalty is 1 percent of the national average premium for each month you delayed. Both penalties are permanent and added to your monthly bill for life.

Can Medicare remove my late penalty if I have a good reason for missing the important date?

You can ask Medicare to waive or reduce the penalty by submitting a waiver request. There is no may provide it will be approved, but Medicare will review your situation. Contact 1-800-MEDICARE to ask about the process.