In computing taxable income, there shall be allowed as deductions:
Contributions to all plans or to all trusts of real or personal property (or real and personal property combined) or to insured plans created under a retirement plan for which provision has been made under the laws of the United States of America, making such contributions deductible from income for federal income tax purposes, shall be deductible only to the same extent under the Income Tax Laws of the State of Mississippi.
For any taxable year ending after December 31, 1997, the period for net operating loss carrybacks and net operating loss carryovers shall be the same as those established by the Internal Revenue Code and the rules, regulations, rulings and determinations promulgated thereunder as in effect at the taxable year end or on December 31, 2000, whichever is earlier.
A net operating loss for any taxable year ending after December 31, 2001, and taxable years thereafter, shall be a net operating loss carryback to each of the two (2) taxable years preceding the taxable year of the loss. If the net operating loss for any taxable year is not exhausted by carrybacks to the two (2) taxable years preceding the taxable year of the loss, then there shall be a net operating loss carryover to each of the twenty (20) taxable years following the taxable year of the loss beginning with any taxable year after the taxable year of the loss.
The term "net operating loss," for the purposes of this paragraph, shall be the excess of the deductions allowed over the gross income; provided, however, the following deductions shall not be allowed in computing same:
Any taxpayer entitled to a carryback period as provided by this paragraph may elect to relinquish the entire carryback period with respect to a net operating loss for any taxable year ending after December 31, 1991. The election shall be made in the manner prescribed by the Department of Revenue and shall be made by the due date, including extensions of time, for filing the taxpayer's return for the taxable year of the net operating loss for which the election is to be in effect. The election, once made for any taxable year, shall be irrevocable for that taxable year.
The commissioner is authorized to promulgate rules and regulations consistent with the provisions in Section 269 of the federal Internal Revenue Code of 1986, as amended, so as to prevent the evasion or avoidance of state income tax.
In the case of a husband and wife living together, having separate incomes, and filing combined returns, the standard deduction authorized may be divided in any manner they choose. In the case of separate returns by a husband and wife, the standard deduction shall not be allowed to either if the taxable income of one of the spouses is determined without regard to the standard deduction.
Miss. Code § 27-7-17