S.C. Code Ann. § 6-1-660

The fee provided for pursuant to this article must be remitted to the local governing body on a monthly basis when the estimated amount of the average of the total of the tax imposed pursuant to Article 5 of this chapter and this article is more than fifty dollars a month, on a quarterly basis when the estimated amount of such average is twenty-five dollars to fifty dollars a month, and on an annual basis when the estimated amount of such average is less than twenty-five dollars a month.