New Jersey Statutes Title 43. Pensions and Retirement and Unemployment Compensation 43 § 15A-7.1

a. In the case of any person who was required to become a member of the retirement system as a condition of employment, and whose application for enrollment in the retirement system or whose application for transfer from one employer to another within the system was filed beyond the effective date for his compulsory enrollment in the system or his transfer within the system, such person shall be required to purchase membership credit for his compulsory coverage by paying into the annuity savings fund the amount required by applying, in accordance with section 25 of chapter 84 of the laws of 1954,  1 his rate of contribution on his current base salary subject to the retirement system for each year of previous service during which he was required to have been a member.

b. If more than 1 year has elapsed from the time that contributions would have been required from such person, 1/2 of the employee's cost, established by the computation provided by subsection a. of this section, will be required of his employer and shall be included in the next budget subsequent to the certification of this special liability by the retirement system. The amount certified by the system shall be payable by the employer to the contingent reserve fund and shall be due and owing to the system even if the employee is no longer in the employ of the employer by the date such moneys are to be paid to the system.

c. The employees' obligation may be satisfied by regular installments, equal to at least 1/2 the normal contribution to the retirement system, over a maximum period of 10 years but not more than 2 years in the case of any employee who has attained or will attain age 60 within the 2-year period, or in the case of any employee who became a member of the retirement system on or after the effective date of P.L.2008, c. 89, has attained or will attain age 62 within the 2-year period.

d. In the case of any person coming under the provisions of this section, full pension credit for the period of employment for which arrears are being paid by the employee shall be given upon the payment of at least 1/2 of the total employee's arrearage obligation and the completion of 1 year of membership and the making of such arrears payments, except that in the case of retirement pursuant to sections 38, 41(b), 48 and 61 of chapter 84 of the laws of 1954,  2 the total membership credit for such service shall be in direct proportion as the amount paid bears to the total amount of the arrearage obligation of the employee.