The problem with paper
Most till receipts are printed on thermal paper, which fades. Heat, sunlight, and time turn them blank — sometimes within months, and reliably within a couple of years. A receipt kept for a five-year appliance warranty is very likely to be unreadable exactly when you finally need it.
Then there is the retrieval problem. Even a perfectly preserved shoebox is useless if finding one receipt means going through four hundred. Paper fails on both storage and search, which is why the answer is not a better shoebox.
Photograph it at the moment of purchase
The single habit that makes receipt tracking work is capturing at the till, while the paper is in your hand. Every alternative — a pile on the desk, a pocket, the car — depends on a second action later, and that action is the one that never happens.
Attach the photo to the transaction rather than filing it separately. A photo in your camera roll is only marginally better than paper, because you still have to find it. A photo attached to the expense is retrievable by the thing you actually remember: roughly when, roughly how much, roughly what.
What is actually worth photographing
Not everything. Capturing every coffee receipt is the same over-engineering that makes people abandon expense categories. Photograph what you might need to prove.
- Anything with a warranty or return window — electronics, appliances, tools
- Utility and telecom bills, for disputes and for proof of address
- Anything you will claim back — work expenses, insurance, medical
- Large or unusual purchases, where the line items matter later
- Repairs and maintenance, especially on a car or a rented home
- Groceries only if you are actively auditing food spending
How long to keep them
Rules vary by country, so treat this as orientation rather than tax advice. Warranty receipts should live as long as the warranty, plus a margin. Anything supporting a tax return or a business expense is usually kept for several years — many jurisdictions expect somewhere between three and seven, and the safe default is to keep what a tax authority could ask about.
The good news is that a compressed photo is a few hundred kilobytes. Keeping seven years of them costs less storage than one modern phone game, so there is no real reason to prune aggressively. Delete when the underlying transaction goes, not before.
Compression, privacy and where they live
Phone cameras produce several megabytes per photo at a resolution no receipt needs. Good receipt tracking resizes and re-encodes on the device before upload — the text stays perfectly legible, the file drops to a fraction of the size, and you do not burn mobile data uploading pixels nobody will look at.
Be deliberate about where images end up. A receipt can show a card's last four digits, a loyalty number, an address, or a medical purchase. Prefer a tracker that stores the image against your own account under the same access controls as the rest of your financial data, and that deletes the photo when you delete the transaction rather than leaving orphans behind.
Making it a habit that survives
Attach the capture to something you already do. If you are logging the expense anyway — by voice, in three seconds, on the way out of the shop — then photographing the receipt in the same flow adds two seconds and no new decision. Habits stick when they ride on existing ones.
Once a month, when reviewing spending, the photos pay you back. The unexplained line item stops being a mystery, the duplicate charge becomes provable, and the warranty claim you had written off becomes possible.