The last month you can contribute
HSA eligibility is monthly. Once Medicare Part A starts, that month usually does not count as an HSA-eligible month. The last month that typically still counts is the month before Part A starts. Confirm with the IRS, your HSA administrator, and a tax professional.
Social Security can pull Part A backward
If you start Social Security, Part A can be awarded retroactively for up to six months — not before you are eligible. That can make the last HSA month earlier than the month you expected. Ask Social Security what your Part A start month will be before you contribute.
Taking Part A while you delay Part B
Many people take premium-free Part A at 65 even if they delay Part B because of a large employer’s coverage. Part A alone is enough to stop HSA contributions. If you want to keep funding an HSA, talk with Social Security and the benefits office before you enroll in Part A.
Spending from an HSA is different
Stopping contributions is not the same as losing the account. You can often still spend existing HSA funds on qualified medical expenses. Contribution rules and spending rules are separate. Confirm with the administrator.
Common questions
- Can I contribute to an HSA after Part A starts?
- Generally no, for any month you are enrolled in Medicare Part A. Confirm with a tax professional. This website is not tax advice.
- Does delaying Part B protect my HSA?
- No. Part A by itself usually ends HSA contributions. Part B delay is a separate question.
Worksheet
HSA stop date when Part A starts
The last month you can contribute to an HSA is the month before Medicare Part A starts.