A sales tax is a tax paid to a governing body for the sales of certain goods and services. Usually laws allow the seller to collect funds for the tax from the consumer at the point of purchase. When a tax on goods or services is paid to a governing body directly by a consumer, it is usually called a use tax. Often laws provide for the exemption of certain goods or services from sales and use tax. A value-added tax (VAT) is one in which tax is charged on all sales, thus avoiding the need for a system of resale certificates. Tax cascading is avoided by applying the tax only to the difference ("value added") between the price paid by the first purchaser and the price paid by each subsequent purchaser of the same item.