HSA and Medicare: What You Need to Know
If you're working past 65 and contributing to a Health Savings Account (HSA), Medicare enrollment adds some complexity that's easy to overlook. Here's a straightforward breakdown.
All information reflects 2026 guidelines.
Can I have an HSA and Medicare at the same time? You can have both — but once you're enrolled in Medicare (Part A and/or Part B), you can no longer contribute to your HSA. That includes employer contributions as well.
What if I'm still working at 65? You may be able to delay Medicare enrollment if you're actively working and covered by employer-sponsored health insurance through a company with 20 or more employees. This allows you to keep contributing to your HSA — but timing matters.
What is the "6-month lookback rule"? This is the detail most people miss. When you enroll in Medicare after 65, your Part A coverage is backdated up to 6 months. To avoid tax penalties, you should stop HSA contributions 6 months before you apply for Medicare — not just before your coverage starts.
The IRS looks at your total contributions for the year. Maxing out your contribution in February can still create an issue if Medicare becomes active later in the same year.
What happens if I don't stop contributions in time? You may have excess contributions subject to a 6% tax penalty until they're removed, and you may need to correct prior tax filings. These are fixable if caught early — less manageable if discovered later.
Can I still use my HSA after enrolling in Medicare? Yes. You can use existing HSA funds for:
Qualified medical expenses
Medicare premiums (with some limitations)
Long-term care costs (within IRS limits)
You just can't add new money to the account.
What if I'm already receiving Social Security? If you're collecting Social Security, you're automatically enrolled in Medicare Part A — which means HSA contributions must stop.
Do I need to enroll in Medicare when I retire? Yes, and the window matters. Once your employer coverage ends, you typically have 8 months to enroll in Part B. Missing that window can mean lifetime late enrollment penalties and gaps in coverage.
The short version: HSA and Medicare can coexist with the right planning. The main things to get right: stop contributions at the correct time, understand how enrollment timing affects your specific situation, and check in before making changes.
If you're approaching that transition, a conversation with a TruLync advisor is a good place to start.
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