760 ILCS 25/1: Right to Disclaim Transfers Under Nontestamentary Instruments.

A grantee, donee, person succeeding to a disclaimed interest, beneficiary under a nontestamentary instrument or contract or person designated to take pursuant to a power of appointment exercised by a nontestamentary instrument may disclaim in whole or in part the succession to any property, real or personal, or interest therein by delivering or filing a written disclaimer in the manner provided in Section 2-7 of the "Probate Act of 1975".