Why your HSA establishment date matters

The date your health savings account was established is the line that decides which of your medical expenses can ever be reimbursed from it. Care you paid for before that date stays outside the account, no matter how good your receipt is.

What the date actually is

It is the date the account was opened with your custodian, not the date you first contributed and not the date your high-deductible plan started. Custodians print it on the account agreement, and most show it in the account details online.

If you moved custodians

A trustee-to-trustee transfer usually carries the original establishment date with it. A new account opened from scratch does not. Keep the older agreement; it is the document that proves the earlier date.

Why it matters more the longer you wait

There is no deadline for reimbursing yourself. An expense from 2026 can be reimbursed in 2046 if the account existed in 2026 and you still have the proof. The proof is the part that decays: portals close, providers merge, and paper fades. That is the whole reason HSA Proof exists.

What the app does with it

HSA Proof asks for the date during onboarding, before it asks for anything else, and stores it alongside every expense you record. An expense dated before the account is marked Likely not qualified, with the reason attached. The record stays; only the assessment changes.