This Medicare Timing Mistake Could Follow You for Life

We all make mistakes. Usually, we quickly recover from them. But some errors can haunt you for the rest of your life, especially when it comes to staying on track for retirement, which requires planning and considering important decisions like when to claim Social Security benefits, how to invest and withdraw from retirement accounts, and, equally important, plan for medical care.

Most Americans are eligible for Medicare upon turning 65. But if you don't handle enrollment correctly, you could put a dent in your financial fitness that will last for the rest of your retirement.

Signing up for Medicare

Medicare itself is divided into several parts:

• Part A: Hospital insurance
• Part B: Medical insurance
• Part C: Medicare Advantage (an alternative to parts A and B)
• Part D: Prescription drug coverage

The vast majority of Americans become eligible for Medicare the year they turn 65. During that year, you enter what is known as an Initial Enrollment Period, during which you can sign up for the program.

This period begins three months before you turn 65 and ends three months after the month you turn 65. If you fail to sign up for Medicare during this time, you could be responsible for paying an extra fee for your coverage. This extra fee is known as a late-enrollment penalty.

Why late-enrollment penalties are so devastating

Late-enrollment penalties sting, and the pain can last for decades. These are not one-time penalties. Instead, they remain with you for as long as you are enrolled in Medicare. 

For the vast majority of Medicare beneficiaries, that essentially means the higher costs remain in place for the rest of their lives.

Part B late enrollment penalties

The Part B late enrollment penalty adds 10% to the monthly premium for each year that you could have signed up for Medicare, but failed to do so. The U.S. Centers for Medicare and Medicaid Services (CMS) illustrates how this works with an example on its website.

If someone delays signing up for Part B for two full years, they will have to pay an extra 20% late enrollment penalty. In 2026, the Part B standard premium is $202.90 per month. The 20% penalty increases that premium by $40.58. The total premium is rounded up to the nearest 10 cents, bringing the total monthly premium with penalty to $243.50.

It is important to note that not everyone pays the standard premium. So, it's possible your penalty costs could be more or less than what you see here.

Part D late enrollment penalties

The Part D enrollment penalty kicks in if you don't join this program when you first sign up for Medicare, or go 63 days or more without credible drug coverage, which is defined as coverage similar to what you would get with Part D.

The penalty is an extra 1% for each month that you failed to enroll. Once again, CMS illustrates the penalty with an example on its website. Someone who waits 14 months to enroll in Part D and doesn't have creditable drug coverage would pay a 14% late enrollment penalty.

In 2026, the national base beneficiary premium is $38.99. With the 14% penalty, an extra $5.50 monthly penalty would be added to the premium after rounding up to the nearest 10 cents. Thus, the total monthly premium for 2026 would be $44.49.

The Medicare mistake older workers make

Some hardworking people who turn 65 continue to enjoy employer-based health insurance coverage. For this reason, they may assume they can simply delay signing up for Medicare without consequence.

However, that is only true if the employer offers group health insurance as defined by the CMS. Once you stop working or no longer receive group health insurance coverage, an eight-month special enrollment period begins when you must sign up for Medicare. Fail to do so, and you could face late enrollment penalties.

Exceptions to penalties

There are a few exceptions that can help you avoid these penalties. For example, those who qualify for a special enrollment period or who enroll in a Medicare Savings Program generally can avoid the Part B penalty.

You can avoid the Part D penalty if you have what is known as creditable drug coverage. This is coverage that has a value similar to what you would get in Medicare Part D. You can also avoid the Part D penalty if you have limited income and resources and qualify for the Extra Help program.

Are there late-enrollment penalties for Part A and Part C?

Most Americans do not pay any premium for Part A, so they do not face a penalty for enrolling late in this aspect of Medicare. However, if your work history, or that of a spouse, does not qualify you for Part A, it is possible to purchase the insurance.

If you are in this group and sign up late for Part A, you will owe a 10% penalty that lasts for twice the number of years you delayed enrolling. There is no penalty for signing up late for Medicare Part C.

How to avoid penalties

The penalties for missing Medicare sign-up deadlines are real and permanent. Fortunately, merely signing up on time will ensure that you avoid these costly blunders.

If you already receive Social Security benefits, the federal government will automatically sign you up for Medicare parts A and B. That means you only have to worry about signing up for Part D.

If you are not yet receiving Social Security, sign up for Medicare by using the online application at the Medicare.gov website. Or, call 1-800-772-1213 to make an appointment to visit a local Social Security office and sign up.

Bottom line

Signing up on time for Medicare should be a cornerstone of your retirement plan. Doing so helps you get the benefits to which you are entitled without having to pay more than you should.

As your 65th birthday approaches, make sure you have a plan to sign up for Medicare before you face costly and permanent penalties. That means enrolling during your Initial Enrollment Period unless you have qualifying employer coverage, verifying that any existing prescription drug coverage is creditable before declining Part D, and enrolling through a Special Enrollment Period as soon as employer coverage ends if you continue working past age 65.

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