N.J. Stat. § 54:49-15.1
For tax paid with respect to reports or returns due on and after the first day of the sixth month following the July 1 next following enactment of this section, interest shall be allowed and paid on every overpayment of tax at a rate determined by the director to be equal to the prime rate, determined for each month or fraction thereof, compounded annually at the end of each year, from the date that such interest commences to accrue to the date of refund. Interest shall commence to accrue on the later of the date of the filing by the taxpayer of a claim for refund or requested adjustment, the date of the payment of the tax, or the due date of the report or the return thereof; but no interest shall be allowed or paid on an overpayment of less than $1.00, nor upon any overpayment refunded within six months after the last date prescribed, or permitted by extension of time, for filing the return or within six months after the return is filed, whichever is later.
N.J.S. § 54:49-15.1