35 Miss. Code R. § 3-08-04-100
The deduction by a corporation in any taxable year for charitable contributions is limited to twenty percent (20%) of its taxable income for the year, computed without regard to the deduction for charitable contributions. Mississippi Law does not conform with Federal Law relative to the percentage limitation on contributions by corporations, or with the definition of a charitable contribution by a corporation. A deduction, subject to the limitation, is allowed only with respect to contributions to corporations, organizations, associations or institutions, including community chest funds, foundations and trusts created solely and exclusively for religious, charitable, scientific or educational purposes, or for the prevention of cruelty to children or animals, no part of the net earnings of which inure to the benefit of any private stockholder or individual.
35 Miss. Code. R. § 3-08-04-100