N.J. Stat. § 34:15-93
To defray the expenses of the commissioner of banking and insurance in carrying out the provisions of this article, each mutual association and each stock company writing workmen's compensation or employers' liability insurance in this state shall annually on or before the first day of June of each year pay to the state tax commissioner for the use of the state a sum equal to one-quarter of one per cent of the net premiums received by it for workmen's compensation and employers' liability insurance written or renewed by it on risks within the state as reported to the commissioner of banking and insurance for the calendar year next preceding the due date of such payment.
The commissioner of banking and insurance shall annually on or before June first of each year ascertain and report to the state tax commissioner all facts necessary to enable the latter to determine, fix and collect all sums payable under this section.
N.J.S. § 34:15-93