New Jersey Statutes Title 54. Taxation 54 § 4-35

a. Except as provided in subsection b. of this section, the assessor shall determine his taxable valuations of real property as of October 1 in each year and shall complete the preparation of his assessment list by January 10 following, on which date he shall attend before the county board of taxation and file with the board his complete assessment list, and a true copy thereof, to be called the assessor's duplicate. Such list and duplicate shall include the assessments of personal property reported or determined pursuant to this chapter. They shall be properly made up in such manner and form required by the Director of the Division of Taxation pursuant to R.S.54:4-26, to be examined, revised and corrected by the board as provided by law.

b. In the case of a municipality located in a county where the county board of taxation is participating in the demonstration program established in section 4 of P.L.2013, c. 15 (C.54:1-104) , in the case of a county operating under the “Property Tax Assessment Reform Act,” P.L.2009, c 118 (C.54:1-86 et seq.), and in the case of a municipality in a county that has adopted, by resolution, the provisions of section 1 of P.L.2018, c. 94 (C.54:1-105), the assessor shall determine the taxable valuations of real property as of October 1 in each year and shall complete the preparation of the preliminary assessment list by November 1, and the assessor shall appear on that date before the county board of taxation and shall file with the board a hard copy of the complete preliminary assessment list, or shall certify to the board, on forms promulgated by the Director of the Division of Taxation in the Department of the Treasury, that the electronic file within the county's MOD-IV tax system is his complete preliminary assessment list.

After all of the assessment appeals filed with the county tax board have been decided, the assessor shall complete the preparation of the final assessment list by May 5, on which date the assessor shall appear before the county board of taxation and shall file with the board his completed final assessment list, and a true copy of the final assessment list, which true copy shall be the assessor's duplicate. The final assessment and the assessor's duplicate shall include the assessments of personal property reported or determined pursuant to the requirements of chapter 4 of Title 54 of the Revised Statutes, in such manner and form as shall be required by the director pursuant to R.S.54:4-26, and shall be examined, revised and corrected by the board as provided by law.