Super Finance Glossary Over 10,000 financial glossary terms... Browse by Letter: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Or Enter Search Term: By Author: All Sources Campbell Harvey Internal Revenue Service Finance Globe FDIC Snow Gold CFTC U.S. Census Bureau Search Tips Sales Tax Source Sales TaxDefinition: A percentage tax on the selling price of goods and services. Source Sales TaxDefinition: A tax on retail products based on a set percentage of retail cost.