Miss. Code Ann. § 27-104-9

After appropriations have been passed into law, but prior to the start of the fiscal year, agencies shall submit to the State Fiscal Officer an operating budget in a format specified by him. The State Fiscal Officer, acting through the Bureau of Budget and Fiscal Management, shall review the operating budgets to insure they are in compliance with the appropriation and return them to the agencies. A copy of the approved operating budget shall be used for authorizing the expenditure of funds appropriated through the allotment process.