The sales tax rate in the state of Indiana is 7 percent as of June 2015, according to the Indiana Department of Revenue. Consumers pay the sales tax when they purchase items from Indiana sellers, and the sales tax applies to all purchases, including Internet transactions.
Indiana first adopted a sales tax in October 1963 and set the rate at 2 percent, notes the Indiana Department of Revenue. The state adopted a rate increase to 4 percent effective May 1, 1973, and increased the rate to 5 percent effective Jan. 1, 1983. From Dec. 1, 2002, to March 31, 2008, the rate was 6 percent, and the state increased the rate to 7 percent effective April 1, 2008.