New Jersey Statutes Title 3B. Administration of Estates Decedents and Others 3B § 9-4.2

a. The disclaimer of an interest in property may be delivered, and if required by this chapter filed, at any time after the effective date of the governing instrument, or in the case of an intestacy, at any time after the death of the intestate decedent, and must be delivered, and if required by this chapter filed, before the right to disclaim is barred by N.J.S.3B:9-9. With respect to joint property, the barring of the right to disclaim the present interest does not bar the right to disclaim the future interest.

b. The disclaimer of a power or discretion by a fiduciary, including an agent acting on behalf of a principal within the implied or general authority of a power of attorney, in a fiduciary capacity may be made at any time, before or after exercise.