New Jersey Statutes Title 27. Highways 27 § 14-16

Contracts may provide for partial payments at least once each month or from time to time as the work progresses on work of construction or maintenance. Ten per centum of the amount due on partial payments on the first 50% of the total contract price shall be withheld from the contractor pending completion of the contract. Thereafter, on the remaining 50% of the total contract price, no per centum of the partial payments shall be withheld from the contractor pending such completion.

Contracts may also provide for partial payments at least once in each month or from time to time as the work progresses on all materials placed upon the site which are suitable for the use and execution of the contract, provided the contractor furnishes releases of liens for all material furnished at the time each estimate of work is submitted for payment, but such partial payments shall not exceed 80% of the value of the material.