N.J. Stat. § 18A:25-5
The teacher in any school in which but one teacher is employed and the principal in every other school shall file with the superintendent of schools of the district, if there be one, otherwise with the county superintendent, at the time of the closing of the school for the summer vacation or of leaving school before the end of the school year, an annual report on blanks furnished for that purpose by the commissioner. Unless such report is filed at said time the last installment of salary due the teacher or principal for the school year shall not be paid to him until the secretary of the board of education shall have received written notice from the superintendent of the district or the county superintendent, as the case may be, that such report has been filed.
N.J.S. § 18A:25-5