South Carolina generally determines individual income tax residency by domicile. In the absence of convincing evidence to the contrary, presence in South Carolina for more than 183 days during the taxable year creates a presumption of residency. Spending 183 days or fewer does not establish nonresidency. This tracker counts presence only and cannot determine domicile or rebut the presumption.
https://www.scstatehouse.gov/code/t12c006.php