N.J. Stat. § 43:13-37.5
A fund shall be created in the following manner for the purpose of paying the benefits provided by this act, to wit:
There shall be deducted by disbursing officers of town funds and paid to said pension fund commission from every payment of salary or compensation to every town employee who shall be entitled to benefits under this act, three per centum (3%) of the amount thereof; provided, however, that in the case of a person hereafter entering the service of any such town after reaching the age of forty years, the said percentage of his salary to be deducted shall in the judgment of the pension fund commission be fixed and determined at not less than three per centum (3%), and such employee, upon notice from said commission of the decision of the commission, shall have the privilege to participate in the benefits of this act or decline to come within its provisions. In addition thereto, there shall be annually raised by the town council of such town in the town budget and contributed semiannually to such pension fund commission an amount equivalent to three per centum (3%) of such "town employees" salary or compensation. Additional sums shall be appropriated and paid to said pension fund commission by said town council as occasion demands to carry out the provision of this act. Where town funds are not available or adequate, or should there be no such town funds, such additional sums shall be raised by temporary loans or notes, certificates of indebtedness or temporary loan bonds to be issued as otherwise provided and limited by law for towns of this State, and the amounts necessary to pay such obligations shall be placed in the town budget for the next ensuing fiscal year. All pensions granted under this act shall be exempt from any State or municipal tax, levy and sale, garnishment or attachment, or any other civil process, and shall be unassignable. No refund of moneys deducted from the salary or compensation of any such employee shall be made.
N.J.S. § 43:13-37.5