Office income is the money that a business or office earns from its operations. The term 'office income' can refer to the total amount of money earned by a business, or it can refer to the income earned by individual employees. In this crossword, the solution for the term 'office income' is 'SALES, ' which refers to the income earned by selling goods or services. SALES is an important part of any business, as it is the primary source of income for most businesses.