Illinois Statutes Chapter 205. Financial Regulation § 625/4. Payable on Death Account Incidents

(a) Any holder during his or her lifetime may change any of the designated beneficiaries to own the account at the death of the last surviving holder without the knowledge or consent of any other holder or the designated beneficiaries by a written instrument accepted by the institution;

(b) Any holder may make additional deposits to and withdraw any part or all of the account at any time without the knowledge or consent of any other holder or the designated beneficiaries to own the account at the death of the last surviving holder, subject to the bylaws and regulations of the institution, and all withdrawals shall constitute a revocation of the agreement as to the amount withdrawn; and

(c) Upon the death of the last surviving holder of the account, the beneficiary designated to be the owner of the account (i) who is then living, if the beneficiary is a natural person, or (ii) that maintains a lawful existence under the state or federal authority pursuant to which it was organized, if the beneficiary is not a natural person, shall be the sole owner of the account, unless more than one beneficiary is so designated and then living or in existence, in which case those beneficiaries shall hold the account in equal shares as tenants in common with no right of survivorship as between those beneficiaries. If no beneficiary designated as the owner of the account on the death of the last surviving holder is then living or in existence, the proceeds shall vest in the estate of the last surviving holder of the account.