You can often delay Part B without a penalty if you have group health insurance through your own or your spouse’s current job. But check the rules before waiting: a delay can leave bills unpaid if Medicare should be paying first.

When Can You Enroll Later Without a Penalty?

You can generally use a Part B Special Enrollment Period if you have had group health coverage from your or your spouse's current employment since you first became eligible for Part B. You may enroll while that coverage continues or during the eight months after the employment or coverage ends, whichever happens first.

For a person age 65 or older, an employer plan from a company with 20 or more employees generally pays first. With a smaller employer, Medicare generally pays first, so delaying Part B may create a serious gap. Confirm the rule with the plan.

Coverage That Usually Does Not Prevent a Part B Penalty

COBRA, retiree insurance, Marketplace coverage, and VA health benefits are not current-employment group coverage for the standard Part B Special Enrollment Period. COBRA also does not extend the eight-month window after work ends.

What If You Have a Health Savings Account?

Once Medicare coverage begins, you can no longer put money into a Health Savings Account (HSA). When you apply after 65, premium-free Part A can start up to six months earlier, but not before you were eligible. Both your own and employer contributions need to stop for months covered by Medicare. Existing HSA funds remain available for qualified expenses. Use Medicare’s working-past-65 guidance to plan the contribution cutoff.

Before delaying, get written answers from the employer plan and use Medicare's sign-up guidance.

Ask Social Security whether you can enroll later without a penalty. Separately, ask your employer plan whether it will pay your bills while you wait. Put the expected coverage end date and requested Part B start date on your calendar before retiring.

Medicare policy sources last checked: October 8, 2026.