N.J. Stat. Ann. § 3A:25-40

Any person who is a devisee or beneficiary under a testamentary instrument, or appointee under a power of appointment exercised by a testamentary instrument, including a person succeeding to a disclaimed interest, or an heir may disclaim in whole or in part the right of succession to any property or interest therein, including a future interest, by filing a disclaimer under this act. A disclaimer may be of a fractional share, expressed as either a percentage or dollar amount, or any limited interest or estate.