Miss. Code § 27-9-5
A tax is hereby imposed upon the transfer of the net estate of every decedent dying on or after January 1, 2000, in an amount equal to the maximum amount of state death tax credit permissible as a credit or deduction in computing any federal estate tax payable by the estate according to the act of Congress in effect, on the date of the death of the decedent, taxing such estate with respect to the items subject to taxation in Mississippi. The tax imposed by this section shall not exceed the aggregate amounts which may by any law of the United States be allowed to be credited against or deducted for federal estate tax. The tax imposed by this section shall be due in the proportion that the estate located in Mississippi bears to the entire estate wherever located. The estate tax hereby imposed by this section shall only be exercised or enforced to the extent of absorbing the amount of any deduction or credit which may be permitted by the laws of the United States now existing or hereafter enacted to be claimed as a deduction or credit against such similar tax of the United States applicable to Mississippi estates.
Miss. Code § 27-9-5