Proof of purchase
Any document that shows a purchase took place: what was bought, from whom, when and for how much.
In short
- A receipt or invoice is the strongest proof. A bank or card statement is the weakest.
- Returns, warranty claims, insurance claims and tax deductions all rely on it.
- Proof has to survive. Faded thermal paper or a deleted email proves nothing.
Proof of purchase is evidence that a specific transaction happened. It usually means a receipt, but it can also be an invoice, an order confirmation, a packing slip or a delivery note. What matters is that it identifies the seller, the date, the items and the amount.
Stronger and weaker proof
Documents are not equally persuasive. A receipt or invoice from the seller is the strongest because it lists what was bought. An order confirmation shows intent but not always delivery. A card or bank statement shows that money left an account, but not what it paid for, which is why tax authorities and expense policies generally will not accept it on its own for a deduction or a tax credit.
Where it gets used
- Tax: supporting business expenses and sales tax credits.
- Expenses: getting an employee reimbursed.
- Returns and warranty: showing a product was bought from that seller and when.
- Insurance: establishing ownership and value after a loss.
The practical problem is keeping it. Paper receipts fade and get lost, and emailed ones get buried. Proof that cannot be found at the moment it is needed has the same value as no proof.
Worked example
A laptop warranty claim
Fourteen months after buying a $1,899 laptop, the screen fails. The manufacturer's warranty is two years, but the claim form asks for proof of purchase. The card statement shows $2,145.87 paid to the retailer that day, which proves payment but not the model. The itemized receipt, saved at the time, shows the model and serial number, and the claim goes through.