The New Jersey Constitution of 1947 (Annotated) Art. VIII, § I, ¶ 5

5. The Legislature may adopt a homestead statute which entitles homeowners, residential tenants and net lease residential tenants to a rebate or a credit of a sum of money related to property taxes paid by or allocable to them at such rates and subject to such limits as may be provided by law.  Such rebates or credits may include a differential rebate or credit to citizens and residents who are of the age of 65 or more years, or less than 65 years of age who are permanently and totally disabled according to the provisions of the Federal Social Security Act, or are 55 years of age or more and the surviving spouse of a deceased citizen or resident of this State who during his lifetime received, or who, upon the adoption of this amendment and the enactment of implementing legislation, would have been entitled to receive a rebate or credit related to property taxes.