Can you use your HSA for bills from before you opened it?
No. Only care after your HSA was opened counts; a bill from before can never be taken out tax-free, however long you keep the receipt.
The rule
Publication 969 is plain: for an HSA, expenses incurred before you establish it aren’t qualified medical expenses. State law decides the day an HSA is established.
An HSA funded by rolling over another HSA or an Archer MSA counts as established on the day the first account was.
The last-month rule can let you put in a full year’s money when you became eligible late in the year. It doesn’t move the date: only expenses after you actually opened the HSA count.
- What to keep
- The day your HSA was opened, from the account’s first statement. Reimburse marks anything before it.
- Watch for
- After it is opened there is no deadline. A bill from this year can come out tax-free in any later year, as long as you keep the record.
Checked on October 2, 2026 against Publication 969, Health Savings Accounts and Notice 2004-50, Q&A 39. An estimate for your records, not tax advice.
Keep the receipt. Take the money out later.
Pay a medical bill yourself and Reimburse keeps the receipt, with who it was for, until you take the money out of your HSA tax-free.