Yes, you can get Medicare while you are still working

You do not have to stop working to get Medicare. If you turn 65 or become may be able to access through disability or end-stage renal disease, you can enroll in Medicare regardless of whether you have a job. However, the rules about when you must enroll, what your employer coverage means, and how much you pay change depending on your work status and the size of your employer.

The key difference is this: if your employer has 20 or more employees and offers health insurance, Medicare becomes your secondary payer, meaning your employer plan pays first. If your employer has fewer than 20 employees, Medicare pays first. These rules affect your out-of-pocket costs and which insurance processes your claims.

Key Takeaways

  • You can enroll in Medicare at 65 even if you are working full-time, and you do not lose your job or benefits by doing so.
  • If your employer has 20 or more employees and offers health coverage, you can delay Part B enrollment without penalty as long as you stay covered by that employer plan.
  • If your employer has fewer than 20 employees, you should enroll in Medicare Part B when you turn 65, or you may face a permanent penalty.
  • You must enroll in Part A (hospital insurance) at 65 even if you are working, though there is no penalty for late enrollment in Part A.
  • Delaying enrollment in Part B while covered by a large employer plan means you can enroll later without the 10 percent monthly penalty that normally applies.

How employer size changes your Medicare rules

The number of employees at your workplace determines whether you can safely delay Part B enrollment. This is called the 20-employee rule. If your employer has 20 or more employees and offers you health insurance, Medicare law allows you to delay enrolling in Part B without penalty. This delay period is called creditable coverage, and it protects you from the late-enrollment penalty that normally increases your premiums by 10 percent for each year you delay.

If your employer has fewer than 20 employees, the rules flip. Medicare becomes the primary payer when ready, and you should enroll in Part B when you turn 65. If you do not, you will owe a permanent 10 percent monthly penalty on your Part B premium for as long as you have Medicare, even after you stop working.

Part A (hospital insurance) works differently. You should enroll in Part A at 65 regardless of employer size or whether you are working. There is no penalty for late enrollment in Part A, but enrolling on time prevents gaps in coverage and keeps your records clear.

When to enroll if you are working at a large employer

If your employer has 20 or more employees and you have health coverage through them, you have a window to enroll in Medicare. You can enroll anytime while you are still covered by the employer plan, or within eight months after your coverage ends — whichever comes first. This eight-month window is your Special Enrollment Period, and it is the only time you can enroll without penalty after turning 65.

Many people working at large employers choose to enroll in Part A at 65 but delay Part B until they leave the job or lose the employer coverage. This approach keeps your Medicare record active while avoiding duplicate premiums. When you do enroll in Part B later, you will not face a penalty because you had creditable coverage through your employer.

You must notify Social Security or Medicare when your employer coverage ends. If you miss the eight-month window after coverage ends, you will owe the late-enrollment penalty. Keep records of your employer plan documents showing your coverage dates, because you may need them to prove you had creditable coverage.

What happens to your employer insurance when you enroll in Medicare

Enrolling in Medicare does not automatically cancel your employer health plan. You can keep both. However, how they work together depends on your employer's size. At a large employer (20 or more employees), your employer plan remains primary, meaning it pays claims first and Medicare pays second. At a small employer (fewer than 20 employees), Medicare pays first and the employer plan pays second.

Some employers offer retiree health plans that coordinate with Medicare. These plans are designed to work alongside Medicare and often cover costs that Medicare does not, such as copayments or deductibles. If your employer offers this, review the plan documents carefully to understand how it coordinates with your Medicare coverage.

You should not drop your employer coverage just because you enrolled in Medicare, unless you understand the consequences. Losing employer coverage can trigger a Special Enrollment Period for Medicare Part B, but only if you enroll within 63 days of losing that coverage. If you wait longer, you will owe a penalty.

Part D enrollment and working status

Part D is prescription drug coverage, and the enrollment rules are strict. If you have prescription drug coverage through your employer or a union, that coverage may be creditable, meaning it is at least as good as Medicare Part D. If it is creditable, you can delay enrolling in Part D without penalty.

When you lose your employer drug coverage — whether because you retire, change jobs, or your employer drops the plan — you have 63 days to enroll in Part D. If you miss this window and do not have other creditable coverage, you will owe a permanent penalty on your Part D premium.

Ask your employer's benefits department whether your drug coverage is creditable. Get this in writing, because you will need proof if you enroll in Part D later. The letter should state the coverage dates and confirm that the plan meets Medicare's creditable coverage standard.

Tax and income considerations for working seniors

Earning income while on Medicare does not change your Medicare premiums directly, but it can affect how much you pay through a rule called Income-Related Monthly Adjustment Amounts (IRMAA). If your income exceeds certain thresholds, you will pay higher premiums for Part B, Part D, and Medicare Advantage plans. The income limits change each year.

IRMAA is based on your modified adjusted gross income from two years prior. If you have a major life change — such as retiring or losing a job — you can request a life-changing event adjustment. This allows Medicare to use your current-year income instead of the two-year-old figure, which may lower your premiums.

Keep in mind that continuing to work and earn income may push you into a higher IRMAA bracket. However, this is usually still less expensive than paying for private insurance if you delay Medicare enrollment. Speak with a tax professional or Social Security representative about your specific situation.

Frequently Asked Questions

Will my employer fire me if I enroll in Medicare?

No. It is illegal for an employer to terminate you because you enrolled in Medicare. Enrolling in Medicare is a personal health decision and does not affect your employment status or job performance. You have the right to keep working and have Medicare at the same time.

Can I delay Part A if I am working?

You can delay Part A enrollment without penalty, but it is not recommended. Enrolling in Part A at 65 costs nothing if you are not yet receiving Social Security, and it ensures you have hospital coverage if you need it. Delaying Part A creates a gap in your coverage record.

What if I work past 65 and do not enroll in Medicare?

If you work past 65 at an employer with 20 or more employees and have their health coverage, you can delay Medicare without penalty. However, you must enroll within eight months of losing that coverage. If you work at a small employer or have no coverage, you should enroll at 65 to avoid a permanent penalty on Part B.

Does working affect my Social Security benefits if I am on Medicare?

Medicare and Social Security are separate programs. Working does not change your Medicare benefits, but it can affect your Social Security benefits if you claim before your full retirement age. Earnings above a certain amount may reduce your monthly Social Security payment. Contact Social Security directly about how your work affects your benefits.

Can I use my employer insurance instead of Medicare?

You can use your employer insurance as your primary coverage if your employer has 20 or more employees, but you should still enroll in Part A at 65. You cannot use employer coverage instead of Medicare Part A — you must have Part A. Part B enrollment can be delayed if you have creditable employer coverage, but only at large employers.