2004-2017 South Carolina corporation income tax rates
The "C" corporation income tax rate is a flat 5.0% of SC taxable income
(federal taxable income + - certain allowed adjustments). If the "C" corporation is a multistate corporation the the tax is 5% of the taxable income apportioned to SC.
Most corporations are also subject to license fee computed at the rate of $1 per $1,000 value on the capital of the corporation apportioned to SC if a multistate corporation. The minimum license fee is $25.
Corporate income taxes and franchise taxes are both reported on Form SC 1120(C corporations) or SC 1120S(S corporations).