S.C. Code Ann. § 4-5-260: State aid to subdivisions for county government; allocation formula for annexed county.

With respect to state aid to subdivisions for county government and the allocation formula for an annexed county, where a portion of one county is annexed to another county, the total amount allocated to the two counties shall not exceed the total which would be allocated to the two counties separately. However, the population of the annexed areas must be taken into consideration in determining the proportionate share of the total allocation due to each county.