South Carolina does require a state income tax. Anyone who earns income in South Carolina must file a federal return and is also required to file a South Carolina income tax return.
As of 2014, the state of South Carolina imposes its income tax as graduated rates that range from a minimum rate of 0 percent to a maximum rate of 7 percent. The state income tax is due on April 15. Estimated tax payment may be filed quarterly on April 15, June 15, September 15 and January 15. South Carolina state income tax refunds can be directly deposited into the taxpayer's bank account or mailed to the taxpayer as a prepaid debit card or as a paper check.