N.J. Stat. § 3B:24-2
Whenever a fiduciary has paid or may be required to pay an estate tax under any law of the State of New Jersey or of the United States upon or with respect to any property required to be included in the gross tax estate of a decedent under the provisions of any law, hereinafter called "the tax," the amount of the tax, except in a case where a testator otherwise directs in his will, and except to the extent where by any instrument other than a will, hereinafter called a "nontestamentary instrument," a direction is given for apportionment within the fund of taxes assessed upon the specific fund dealt with in the "nontestamentary instrument," shall be apportioned among the fiduciary and each of the transferees interested in the gross tax estate whether residents or nonresidents of the State, in accordance with the rules of apportionment stated in this chapter, and the transferees shall each contribute to the tax the amounts apportioned against them. Nothing in this chapter shall be taken to require an apportionment of an estate tax inter sese among the devisees and beneficiaries under a will or among those who take as the heirs at law of a person dying intestate, or against the interest of any surviving spouse in any real property which was held by the spouse and the decedent as tenants by the entirety.
N.J.S. § 3B:24-2