The business and occupation tax (often abbreviated as B&O tax or B/O tax) is a type of tax levied by the U.S. states of Washington, West Virginia, and, as of 2010, Ohio, and by municipal governments in West Virginia and Kentucky. It is a type of gross receipts tax because it is levied on gross income, rather than net income. While deductions are not permitted for labor, materials, or other overhead expenses, the State of Washington does allow certain deductions, exemptions, and credits, by statute.