A claim on property, real or personal, that will begin at some point in the future. A future interest allows the grantor to retain the right to use that property until the specified transfer date. Future interest agreements are often used by donors for tax purposes. For example, a person may grant a future interest in his or her home to a charity, with the stipulation that he will retain use of the home for the remainder of his life, also called a "life estate." Although the charity will not receive the property until the donor's death, the donor can claim a tax deduction the same year the future interest is granted. Also called future estate.