Turning 65 While Still Working: What Changes and What Doesn't

If you're turning 65 and still working, one of the most common questions is whether you need to sign up for Medicare right away — and the honest answer is that it depends on a few specific details about your employer coverage, not on your age alone. For some people, enrolling immediately is the right move; for others, delaying part of Medicare without a penalty is possible. The difference usually comes down to the size of the company you work for and the type of health plan it offers.

The general rule most people run into involves employer size. If you work for a company with a certain number of employees, your employer coverage may be considered primary, and you may be able to delay enrolling in Medicare Part B without facing a late-enrollment penalty later, as long as you enroll within a set window after your employment or coverage ends. If the company is smaller, Medicare may instead become primary at 65, which changes the calculation significantly. Because this threshold and the exact rules can shift, it's worth confirming your employer's size and plan type directly rather than assuming either scenario applies to you.

Part A, which generally covers hospital stays, often comes at no additional premium for people who've worked and paid Medicare taxes long enough, which is why many people sign up for Part A at 65 even while keeping employer coverage — there's usually little downside to having it as a backup. Part B, which covers doctor visits and outpatient care, typically does carry a monthly premium, and that's the piece most people consider delaying if their employer coverage is comprehensive.

One detail that trips people up: even if you're allowed to delay Part B, you'll generally want to enroll before your employer coverage or employment ends, using a Special Enrollment Period rather than waiting and hoping to sort it out later. Missing that window can mean waiting for the next General Enrollment Period and potentially facing a late-enrollment penalty — the opposite of what delaying was supposed to accomplish.

Health Savings Accounts add another layer worth knowing about if you have one through your employer. Once you enroll in any part of Medicare, including just Part A, you generally can't continue contributing to an HSA. If you're actively contributing and want to keep doing so a bit longer, this is worth discussing with your employer's benefits team and a tax professional before you enroll in anything, even the 'free' Part A.

If your employer coverage is through a small company, or if you're on retiree coverage, COBRA, or a Marketplace plan rather than active large-group employer coverage, the rules generally work differently, and delaying Medicare without a penalty often isn't an option in the same way. This is exactly the kind of detail worth confirming for your specific coverage type rather than assuming it works like a typical large-employer plan.

Once you do decide to enroll, whether right at 65 or later through a Special Enrollment Period, you'll face the same choice everyone does: Original Medicare or a Medicare Advantage plan, each with its own tradeoffs around network flexibility and included benefits. That decision doesn't have to happen at the same moment as figuring out your employer coverage timeline — it's worth separating the two questions so neither gets rushed.

Turning 65 while working doesn't come with a single universal answer, and getting the timing wrong can be costly in ways that are hard to undo. If you're in Broward County and want to walk through your employer coverage and enrollment timeline together, in English or Spanish, I'm glad to help you sort out exactly what applies to your situation before you make any moves.