Why thermal receipts fade, and how to keep them

Every accounting firm knows the moment. The client hands over a plastic bag of receipts at year-end, you pull out a petrol receipt from February, and it is a pale grey strip. You can see there was a total once. You cannot see what it was.

So the firm does what firms have always done. Someone sits at the photostat machine with a stack of small slips, copies the ones that can still be read, and glues the copies or the originals onto A4. It is slow, it uses up afternoons in the busy season, and the copy is only as good as the receipt was on the day it was copied.

It helps to understand why the paper behaves this way. Once you know what fades it, you can slow it down, and more importantly, stop depending on it.

How thermal paper works

A thermal receipt has no ink. The paper is coated with chemicals that react to heat. The printer head heats tiny points on the coating, those points turn dark, and that is the text you see. No ribbon, no cartridge, which is why almost every point-of-sale printer uses it.

The catch is that the coating keeps reacting to its surroundings after it leaves the printer. The same chemistry that made the text can slowly undo it, or darken the whole slip.

Thermal paper is common on:

• petrol station and convenience store receipts
• supermarket and hardware store receipts
• card terminal slips
• parking and toll printouts
• most small shop POS receipts

A quick test if you are not sure: scratch the blank side, or the back, firmly with a fingernail. Thermal paper usually shows a dark mark where you scratched. Ordinary paper does not.

What makes it fade faster

These are the usual causes, and most of them describe exactly how clients store receipts:

• Heat. A car dashboard, a hot storeroom, a drawer next to a machine. Heat can also turn the whole receipt grey or black, which hides the text just as well as fading does.
• Light. Sunlight and strong light fade the print over time.
• Plastic. Receipts kept in plastic sleeves, plastic bags or PVC folders react with chemicals in the plastic. A clear sheet protector is one of the worst places to keep them.
• Friction and folding. Rubbing in a wallet or pocket, and creasing, wear the coating away.
• Oils and chemicals. Hand cream, hand sanitiser, alcohol and greasy fingers all damage the coating.
• Tape and some glues. Sticky tape laid across the printed side, and some glues, can damage the print underneath. Gluing receipts to A4 face-down, or taping over the total, makes it worse.
• Laminating. Laminators use heat. A laminated thermal receipt often turns black.

How long a given receipt lasts depends on the paper and on how it is kept. There is no reliable single number, which is exactly the problem: you cannot know in advance which slips will still be readable in year five.

What the rules ask for

Under section 82 of the Income Tax Act 1967, a business keeps sufficient records for 7 years. LHDN’s Public Ruling 4/2000 for companies lists receipts and invoices among the supporting documents to retain, and says records in manual or electronic form should be sufficient to explain each transaction. It also says that where computers are used to record transactions, original source documents such as invoices and receipts should be retained. So a scan of a paper receipt is a working copy, not a replacement.

For SST-registered clients the Act says it directly. Section 24(4) of the Sales Tax Act 2018 and of the Service Tax Act 2018 says a record originally on paper must be kept in its original form after it is scanned. Details in SST record keeping.

So the practical answer for most firms is not “paper or digital”. It is both: keep the original, as well as you reasonably can, and capture a clear copy early, while the receipt can still be read. The copy is what you will actually work from and search. The original is what you keep because the rules say so. More on the 7-year rule in how long to keep receipts in Malaysia.

Keeping the originals in better shape

Simple habits that cost nothing:

1. Paper envelopes, not plastic. One envelope per month per client, labelled.
2. Cool, dark and dry. A closed box away from windows, machines and the storeroom roof.
3. Flat, not folded. Less creasing, less rubbing.
4. No tape or glue on the printed side. If a receipt must be attached to something, attach it by the blank edge.
5. Never laminate.
6. Tell clients early. “Don’t leave receipts in the car” saves more receipts than anything the firm does later.

None of this stops fading. It only slows it down.

Capture the copy while it can still be read

The copy is only useful if it is taken in time and taken properly:

• Capture within days, not at year-end. By the time the bag of receipts reaches the firm in March, the February ones may already be pale. Getting clients to send receipts monthly is the biggest single fix; see how to get client receipts without the monthly chase.
• Flat and in good light. No shadows, no glare, no fingers over the total.
• The whole receipt. Top to bottom: shop name and registration number at the top, date, items, tax and total at the bottom. Long receipts sometimes need two photos.
• Check it before the paper goes away. If the photo can’t be read, the original can still be photographed again today. In a year, it may not.
• Store the copy where it can be found. Searchable by vendor, date and amount, kept for the full 7 years, and backed up off the office PC.

That replaces the photostat step completely. A clear photo taken in the first week does the same job as a photostat taken in the first week, without the A4, the toner or the glue.

Where AccPilot fits

AccPilot is built for this step. Clients or your staff snap and upload receipts from a phone, upload from the web, email them in, or use the upload link you send the client, so receipts arrive while they are still readable. A photo with several receipts on it is split into separate documents. AccPilot reads the vendor, date, amounts and tax, and marks each one Ready or Check with the reason, so a faded or unclear receipt gets a human look while the original still exists. Every document is stored and searchable by vendor, date and amount for 7 years, and the details go out in one clean Excel that imports into your accounting software.

AccPilot does not replace the originals: clients still keep the paper, though an envelope per month does the job and the glue and photostat can go. What stays your firm’s call is how each client stores them.

To see how your clients’ faded receipts come through, book a free demo and bring a few of the worst ones.