S.C. Code Ann. § 11-11-350
Each state agency, department, institution, or entity receiving in the aggregate one percent or more of the state's general fund appropriations for any fiscal year shall provide to the Office of State Budget an estimate of its planned general fund expenditures for the next three fiscal years. This data, in conjunction with the Board of Economic Advisors' long-term revenue estimate, must be compiled by the Office of State Budget into a three-year financial plan that will assist the State in determining and planning for its long-term financial commitments. The plan must be updated annually and prepared for submission to the State Budget and Control Board, the Speaker of the House of Representatives, and the President Pro Tempore of the Senate during the second quarter of each fiscal year.