An expense is said to be revenue in nature if it adds or contributes to the operating income of the business. This means that the expense is directly related to the revenue-generating activities of the business and is necessary for the day-to-day operations. Examples of revenue in nature expenses include salaries, wages, rent, and utilities, among others. These expenses are necessary for the production of goods or services and are incurred during the normal course of business operations. By contrast, capital expenses are expenditures made on fixed assets or to acquire long-term assets and are not considered to be revenue in nature.