Medicare and HSA accounts.
Enrolling in Medicare stops new HSA contributions. Here is how to time it, the 6-month look-back, and what you can spend HSA funds on.
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You cannot contribute to an HSA once you have Medicare
HSA eligibility requires you to be enrolled in a high-deductible health plan AND not be enrolled in any other coverage — including Medicare.
Once any part of Medicare is in effect (typically Part A), new HSA contributions must stop.
The 6-month Part A look-back
If you sign up for Social Security after 65, Medicare Part A enrollment is backdated up to 6 months (but not before your 65th birthday). Any HSA contributions during the backdated months become excess contributions subject to tax penalties.
If you plan to keep contributing to an HSA past 65, you typically need to delay BOTH Social Security and Part A enrollment.
What you can still spend HSA funds on
You can spend existing HSA balances tax-free on qualified medical expenses at any age — even after Medicare starts.
After 65, HSA funds can be used for Medicare premiums, deductibles, copays, and qualified medical expenses tax-free. Withdrawals for non-medical expenses after 65 are taxed as ordinary income but not penalized.
- Medicare Part B premiums (excluding Medigap)
- Medicare Part D premiums
- Medicare Advantage premiums
- Deductibles, copays, coinsurance
- Most qualified medical expenses