A capital receipt is money that comes into a business from a source other than its normal day-to-day trading activities, typically from selling or disposing of long-term (fixed) assets, or from raising long-term finance such as loans or additional capital.
Selling a motor vehicle that the business owns and uses (a fixed asset) generates a capital receipt, because the vehicle is not an item held for resale in the ordinary course of business; the receipt arises from disposing of a long-term asset, not from trading.
By contrast, money collected from trade debtors, receipts from selling stock in trade, and receipts from trading activities generally are all revenue receipts: they arise from the business's normal, recurring trading operations of buying and selling goods, and they are the kind of receipts that appear in the Trading and Profit and Loss Account.
To tell capital and revenue receipts apart quickly, ask whether the receipt arose from an asset the business uses to run the business (capital) or from goods and services the business sells as part of its trade (revenue).