The HSA + Medicare Rule

Once you enroll in any part of Medicare — including Part A — you are no longer eligible to contribute to a Health Savings Account (HSA). This is an IRS rule, not a Medicare rule.

This catches many people off guard, especially those who sign up for Social Security at 65 (which automatically triggers Part A enrollment) while planning to keep their HSA active.

⚠️ The 6% Excise Tax Penalty

If you contribute to an HSA after enrolling in Medicare, the IRS can impose a 6% excise tax on excess contributions — and this penalty compounds each year the excess remains in the account. This is one of the most common (and avoidable) Medicare mistakes.

What You Can Still Use HSA Funds For

While you can't contribute to your HSA after Medicare enrollment, you can still use existing HSA funds tax-free for qualifying medical expenses:

  • Medicare Part B, Part D, and Medicare Advantage premiums
  • Deductibles, copays, and coinsurance
  • Dental, vision, and hearing expenses
  • Long-term care insurance premiums (up to IRS limits)
  • Prescription medications

Note: You cannot use HSA funds tax-free to pay Medicare Supplement (Medigap) premiums.

Key Planning Tips

Working Past 65

If you're still working with employer HDHP coverage, you can delay Medicare Part A & B and continue HSA contributions — as long as you haven't filed for Social Security.

Social Security at 65

Filing for Social Security at 65 automatically enrolls you in Part A, ending your HSA eligibility. Plan contributions accordingly — stop 6 months before your Medicare start date.

Under-65 Spouses

If your spouse is under 65 and on your employer HDHP, they can still contribute to their own HSA — even after you enroll in Medicare.

Frequently Asked Questions

Yes — you keep the account and can continue using the funds. You just can't make new contributions after enrolling in any part of Medicare.

Stop contributing at least 6 months before your Medicare Part A effective date. Social Security can retroactively apply Part A up to 6 months, so plan ahead to avoid excess contribution penalties.

No. IRS rules do not allow tax-free HSA withdrawals for Medicare Supplement (Medigap) premiums. However, you can use HSA funds for Part B, Part D, and Medicare Advantage premiums.

You can withdraw excess contributions before your tax filing deadline to avoid the 6% penalty. Consult a tax professional, and contact us to help plan your Medicare transition.