Miss. Code Ann. § 27-9-17

The executor of the estate of a nonresident shall have the option of paying an estate tax due under this chapter by paying on the proportion of the estate located in Mississippi, which said proportion bears to the entire estate wheresoever located, and taking the allowable deductions and exemptions in the same proportions, or by paying upon the gross estate located within this state without taking any deductions whatsoever, provided that it shall not be necessary for a nonresident to pay upon any estate unless the gross estate, wheresoever situated, shall be above the amount of the specific exemption provided in Section 27-9-11.