35 Miss. Code R. § 10-01-110
If an employer qualified for the credit but then reduced employment levels through layoffs or plant closures, the reduction in employment must continue for a minimum of five (5) years before the employer may use the reduced employment levels in the computation of additional credit. If the reduction in employment is for five (5) years or more, then the employer may requalify for the credit on any additional jobs. If the reduction has continued for less than five (5) years, then the employer may requalify in very limited circumstances. Such situations will be considered on a case by case basis. The taxpayer should submit a letter with a request to receive the credit and a justification for the request. The credit will be granted at the discretion of the Commissioner.
35 Miss. Code. R. § 10-01-110