A revenue expenditure is a cost that is charged to expense as soon as the cost is incurred. By doing so, a business is using the matching principle to link the expense incurred to revenues generated in the same reporting period. This yields the most accurate income statement results. There are two types of revenue expenditure:
Generating revenue. This is all day-to-day expenses needed to operate a business, such as sales salaries, rent, office supplies, and utilities.
Other types of costs are not considered to be revenue expenditures, because they relate to the generation of future revenues. For example, the purchase of a fixed asset is categorized as an asset and charged to expense over multiple periods, to match the cost of the asset against multiple future periods of revenue generation. These expenditures are known as capital expenditures.