In any instance in which a taxpayer requests or the commissioner requires the use of any of the alternative apportionment methods in this subsection, the party requesting or requiring the method shall bear the burden of proving by preponderance of the evidence in any administrative or judicial proceeding that the methods set forth in Sections 27-7-24, 27-7-24.1, 27-7-24.3, 27-7-24.5 and 27-7-24.7 do not fairly represent the extent of the taxpayer's business activity in this state and that the proposed method more fairly represents that activity than any other reasonable method available. The alternative apportionment authority specified in this subsection is intended to be invoked only in limited and unique, nonrecurring circumstances where the standard apportionment provisions contained in the statutes and regulations produce unanticipated results that do not fairly represent the extent of the taxpayer's business activity in this state.
Miss. Code § 27-7-24