Somewhere in a kitchen drawer, there is a pharmacy receipt for $43.18. It's curling at the edges and the ink is going the color of weak tea. Nobody will ever look at it again, and that is the quiet tragedy of it. For a person with a Health Savings Account, that receipt may be a small coupon for tax-free money. The coupon has no expiration date. It only works if you can still prove the expense happened.

Most people treat the HSA like a debit card. They swipe it at the dentist and forget about it. A smaller group has noticed something stranger in the rules, and it changes how you should think about every medical receipt you get.

The rule that has no clock

According to IRS Publication 969, you can take a tax-free distribution from your HSA to reimburse yourself for a qualified medical expense. The expense has to have been incurred after you established the HSA. The IRS does not set a deadline for taking that reimbursement.

So suppose you pay a $900 dental bill out of pocket in 2026. You leave your HSA money invested and untouched. In 2041 you can withdraw $900 from the account, tax-free, as reimbursement for that bill. The money in between can grow while you wait. That's why some people call this the "shoebox strategy."

I'm not recommending the strategy. Whether to pay out of pocket or from the HSA depends on your cash flow, and a tax professional can speak to your situation. The point is narrower. If you ever want to use the rule, you need records. Pub 969 and the general tax-recordkeeping rules put the burden on you, not on your HSA provider, to show that each withdrawal paid for a qualified expense.

The custodian doesn't check what you spent the money on. Nobody reviews your withdrawals when you make them. The question only comes up if the IRS asks, perhaps years later, and the answer has to come from your paper.

Why the receipt you toss feels harmless

Behavioral economists have a name for the instinct that makes you toss it. It's present bias, the tendency to overweight what's in front of you and shrink what's far away. A receipt for $43 is small and boring, and the benefit is decades off. Your brain does the math and the receipt goes in the trash.

Memory doesn't rescue you later. Hermann Ebbinghaus's forgetting-curve experiments in the 1880s showed that memory for newly learned material drops steeply at first. That was nonsense syllables, not pharmacy visits, so don't over-read it. But anyone who has tried to recall what a 2019 urgent-care copay was for knows the principle holds. "I'm sure I spent thousands" is not documentation.

There's also a physical problem. Many store receipts are printed on thermal paper, and thermal prints can fade with heat, light, and time. The receipt you keep in a drawer for twelve years can end up as a blank slip.

What a good HSA record actually contains

The IRS wants you to be able to show three things. Pub 969 describes them in the context of tax-free distributions:

  • The distribution was used exclusively to pay or reimburse qualified medical expenses.
  • Those expenses weren't paid or reimbursed from another source, such as insurance.
  • You didn't also claim the expense as an itemized deduction in another year.

A bare credit card statement usually can't prove those things. It shows a merchant name and an amount. It doesn't show that the charge was a qualified medical expense, or what the insurer paid, or whether you were reimbursed.

The documents that do the work are usually these:

  • The itemized receipt or provider bill, showing the date of service, what it was for, and the amount you owed.
  • The Explanation of Benefits (EOB) from your insurer. It shows what insurance paid and what was left for you. It's the best evidence that the amount you're withdrawing is the amount you actually owed.
  • Proof of payment, such as a card statement line or a receipt marked paid.
  • Pharmacy printouts showing the drug name and the date. A lone register total of $43.18 doesn't say what it bought.

One caution about the date. The expense must be incurred after your HSA was established. A receipt from before the account existed doesn't qualify, however medical it is. Note the date you opened the account at the top of your records so you don't reimburse yourself for the wrong year.

Why a folder of photos isn't a system

The camera roll feels like a solution. It isn't, for the same reason a shoebox isn't: you can't find anything in it. In 2038, you'll be looking for "that orthodontist bill" in a stream of 14,000 pictures with no labels.

An HSA record is useful only if you can answer two questions fast. What did I spend in a given year? And have I already claimed it? That second question is the one that gets people into trouble. Reimbursing the same expense twice would be a taxable, penalizable error, and a single running log prevents it.

A plain spreadsheet is enough. One row per expense, with the date of service, the provider, the amount you paid, the file name of the scan, and a column for "reimbursed on (date)." Fill in the last column the day you take the withdrawal.

Your next moves

  • Write down your HSA open date today. Put it at the top of a note or spreadsheet. Expenses before that date can't be reimbursed, so this one line keeps you from logging ineligible receipts.
  • Pull out the last 12 months of medical paper and scan the ones you paid out of pocket. Include itemized receipts, EOBs, and pharmacy printouts. Skip the ones your HSA card already covered, unless you want a complete record.
  • Name every file the same way. Something like 2026-03-14_Dentist_900.00_OOP.pdf (date, provider, amount, paid out of pocket) sorts itself and survives a decade of forgetting.
  • Start the log with a "reimbursed on" column. Leave it blank until you actually withdraw. Add the date the moment you do, so no expense is ever claimed twice.
  • Back up the folder in two places. Keep one in a cloud or encrypted drive you control, and a second copy elsewhere. A record meant to last until 2045 shouldn't live on one phone.
  • Keep the EOB with the bill. Scan them as a single PDF, so the proof that insurance paid its part travels with the proof that you paid yours.

Then put a recurring reminder on your calendar, once a quarter, to scan anything new. Ten minutes four times a year is what this takes.

A note on FSAs, which work differently

Don't apply any of this to a Flexible Spending Account. FSAs generally have a plan-year structure, and the plan may allow either a limited carryover or a short grace period, but not both, and some allow neither. Claims also have a run-out deadline. Check your plan documents, because the "no deadline" rule belongs to HSAs.

Where a scanner earns its place

A receipt is the least glamorous piece of paper in your life, which is exactly why it disappears. The part worth protecting is the part nobody feels pressure to protect: the small, dated, ordinary proof that something cost what you say it cost. If you'd like a private place to capture those pages as clean, searchable PDFs, LumenScan reads them on your device. The text is searchable without your medical paperwork leaving your phone. You can find it at https://lumenscan.lumenlabs.works, whenever the drawer starts to feel like a liability. Either way, scan the $43 receipt today.