Do I have to file a state return in south carolina

You may or may not have to -- not knowing your specific situation, there's no way to answer this correctly.

However, if you'll see “SHOULD I FILE A SOUTH CAROLINA INCOME TAX RETURN?” on page 6 of 2018 SC 1040 INDIVIDUAL INCOME TAX FORM AND INSTRUCTIONS , you’ll see whether you need to file a South Carolina return or not.