The pharmacy receipt you paid with an HSA card and the one you claimed from an FSA look exactly alike in the shoebox. They run on very different clocks, and mixing them up is how people either keep FSA receipts for a decade or toss the HSA receipt they'll need later.
The short answer, in the US, generally:
- HSA receipts: keep each one until you've been reimbursed for it, then keep it with your tax records until the period of limitations for that year's return runs out, usually 3 years after filing. Because you can reimburse yourself years after the expense, that can be a long time.
- FSA receipts: no official rule covers how long you keep them after reimbursement. A common practice is to keep them until the plan year's claims are closed and the plan has stopped asking about card purchases.
If you need a refresher on which account is which, FSA vs HSA covers the differences. The master retention chart covers everything else.
How long to keep HSA and FSA paperwork
| Document | Keep for | Why / source |
|---|---|---|
| HSA receipt, already reimbursed | With your tax records, generally until 3 years after filing | IRS Publication 969: "Keep them with your tax records" |
| HSA receipt you haven't reimbursed yet | Until you reimburse yourself, then as above | Publication 969 names no reimbursement deadline |
| Itemized bill or EOB behind an HSA payment | Same as the receipt (common practice) | Shows the expense was a qualified medical expense |
| FSA claim documentation | Until the plan year's claims are closed (no official rule) | Each plan sets its own claim deadlines |
| FSA debit card receipts | Until the plan has accepted the charge (common practice) | Some card purchases may still need substantiation |
| Archer MSA receipts | Same as HSA receipts | Publication 969 repeats the same recordkeeping list |
What an HSA receipt has to prove
IRS Publication 969 says you must keep records sufficient to show three things:
- "The distributions were exclusively to pay or reimburse qualified medical expenses,"
- "The qualified medical expenses hadn't been previously paid or reimbursed from another source," and
- "The medical expenses hadn't been taken as an itemized deduction in any year."
That's more than a card slip can show on its own. A receipt that says "$84.20, pharmacy" doesn't prove the $84.20 was a prescription rather than shampoo. An itemized receipt, a bill from the provider, or the EOB from your insurer fills the gap, which is why a common practice is to keep the bill or EOB with the HSA receipt. The third point ties into your taxes: if you also deduct medical expenses, IRS Publication 502 is the rulebook, and the same expense can't count twice.
Publication 969 is also clear on where these records go: "Don't send these records with your tax return. Keep them with your tax records."
Reimbursing yourself later: why HSA receipts can matter for years
Here's the part that surprises people. Publication 969 says "You can receive tax-free distributions from your HSA to pay or be reimbursed for qualified medical expenses you incur after you establish the HSA," and "You don't have to make withdrawals from your HSA each year." It names no deadline for reimbursing yourself for an old expense.
So some people pay medical bills out of pocket, leave the HSA money invested, and reimburse themselves later. That's a legitimate choice, but it puts the whole weight on the receipt. If you plan to reimburse yourself in five years, that receipt has to survive five years, and then the tax-record period after that.
In the US, generally, the IRS says to keep records that support an item on your return until the period of limitations for that return runs out: 3 years after filing in the usual case, longer in a few unusual ones. In practice, the receipt goes into the tax folder for the year you take the money out, not the year you saw the doctor. Check IRS.gov or a tax professional if your situation is unusual.
Two habits keep this manageable. Mark each receipt "reimbursed" or "not yet" the day you save it. And keep a simple running list of unreimbursed expenses, so you know what you can still claim.
FSA receipts: substantiation, then done
An FSA works differently. You claim from the plan, and the plan wants proof up front. Publication 969 says you must provide "a written statement from an independent third party stating that the medical expense has been incurred and the amount of the expense," plus "a written statement that the expense hasn't been paid or reimbursed under any other health plan coverage."
FSA debit cards add a wrinkle. Publication 969 says that if card use "meets certain substantiation methods, you may not have to provide additional information to the health FSA." The word "may" matters: some card purchases may still lead the plan to ask you for the itemized receipt.
There's no official rule for how long to keep FSA receipts after the plan has paid. Each plan sets its own claim deadlines, so a common practice is to keep receipts until the plan year's claims are closed and no documentation requests are outstanding. After that, an FSA receipt for something you didn't also deduct has done its job.
Where to keep them
These receipts are mostly thermal paper, which fades. Scan them the day you get them.
On an iPhone, the Files app does it. Open Files, tap the More button (the three dots), tap Scan Documents, and hold the receipt in view; in Auto mode it captures by itself. Choose a folder and tap Save. Two folders cover most households: "HSA – not yet reimbursed" and "HSA – reimbursed 2026". When you pay yourself back, move the receipt across. Keep the matching bill or EOB in the same folder; how long to keep medical bills and EOBs covers those on their own.
Paperlock suits the long-haul HSA case, because it reads each receipt and bill as you save it, notes the provider, the date and the amount, and keeps medical documents behind Face ID. Years later, "show me pharmacy receipts from 2026" brings them back without anyone remembering which folder they went in.