When Can You Delay Medicare Part B Without a Penalty?

You are turning 65 and plan to keep working. The employer health card remains in your wallet. Paying a Part B premium now may seem unnecessary.

A delay can be protected. The word “employer” on an insurance card is not enough by itself. The coverage must pass a current-employment test.

What makes a Part B delay protected?

Start with the source of coverage. Medicare tells people to confirm that the plan is employer group health coverage. The coverage must be tied to current work.[1]

The current worker may be you or your spouse. Retiree coverage does not meet the same test. COBRA also follows different enrollment rules.[1]

Ask the benefits administrator to state the coverage basis in writing. Use this question: “Is this group health plan coverage based on current employment for Medicare Part B enrollment?”

Record whose employment creates the coverage. Then record when that employment is expected to end.

Coverage status can change while the insurance card stays the same. A retirement classification may end current employment protection. Reduced hours may also change the answer. Confirm the status after either event.

Why does the primary payer matter?

Coverage can exist and still pay second. That creates a different decision from having a plan that pays first.

For someone aged 65 or older, an employer plan generally pays first when the employer has at least 20 employees. Medicare usually pays second.[2]

When the employer has fewer than 20 employees, Medicare generally pays first. The employer plan pays second unless a qualifying multi-employer arrangement changes the result.[2]

KFF describes the practical consequence for spousal coverage. A person may be able to delay Part B without penalty when the current employer has at least 20 employees.[3]

Ask the insurer to confirm the primary payer. Do not rely only on the employee count. Save the written answer with the plan booklet.

Ask whether the plan is part of a multi-employer group. Ask whether an exception affects payer order. Get the final coordination answer from the insurer.

When does the protected window end?

The Part B Special Enrollment Period continues while qualifying current-employment coverage remains in place. It also provides an eight-month period after that coverage ends.[4]

That outer limit should not become the target application date. A protected enrollment can still leave a gap if Part B begins after the employer plan ends.[4]

Build the handoff from the desired Part B effective date. Ask Social Security when to submit the request. Then allow time for the employer to complete any coverage verification.

Plan backward from the effective date. Add time for employer paperwork. Add time to confirm that Social Security received the request.

The cost of missing the protected window can continue. KFF says the Part B penalty is generally 10% of the standard premium for each full 12-month delay period. It usually remains while the person has Part B.[5]

What can make a planned delay fail?

One risk is automatic enrollment. Fidelity notes that people already receiving Social Security before age 65 may be automatically enrolled in Parts A and B.[6]

Review every Medicare card or enrollment notice promptly. Follow the supplied instructions if Part B is to be declined. Confirm the change with Social Security.

Another risk is a change in employment status. A leave, retirement, or termination may change the coverage basis. Ask the benefits administrator whether the current employment status still applies.

A third risk is using the COBRA end date as the Part B deadline. COBRA does not preserve the current employment protection.[1]

Dovetail Principle: Financial Decisions Need to Fit Together

The premium decision depends on coverage status. The enrollment date depends on the employment timeline.

Keep those decisions on one page. The delay is useful only as long as the coverage and deadline continue to support it.

Where should you begin?

Ask the employer to confirm that the plan is based on current work. Ask the insurer which coverage pays first. Then write down the expected end date.

Social Security administers enrollment in Parts A and B. Its application asks for the dates of group health plans after age 65.[7]

Set a planned application date before the employer coverage ends. Keep the submission receipt. Confirm the Part B effective date before relying on the handoff.

For help coordinating health coverage with retirement cash flow, see Retirement Income Planning.

Related Reading: Turning 65 While You or Your Spouse Is Still Working: When Does Medicare Begin?

About the author

Ross Marino, CFP®, CeFT®, is the Founder & CEO of Dovetail Financial and creator of Human-First Financial Guidance®. He helps people nearing or living in retirement connect their lives and wealth so that financial decisions become clearer, more personal, and easier to navigate.

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Notes

1. Working past 65, Medicare.gov.
2. How Medicare Works with Other Insurance, Centers for Medicare & Medicaid Services, February 2026.
3. I am about to turn 65; my spouse is 60 and still working. Do I have to do anything with regard to Medicare this year?, KFF, Sep 1, 2025.
4. Enrolling in Medicare with job-based insurance, Medicare Interactive, March 23, 2025.
5. I didn’t sign up for Part B when I first became eligible, but want to sign up now. Is there any way to avoid the penalty?, KFF, Sep 1, 2025.
6. Working after 65? Avoid 5 Medicare pitfalls, Fidelity Investments, April 13, 2026.
7. Sign up for Medicare, Social Security Administration.

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