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How to Make a Valid Will in Illinois

What Illinois law requires for a valid will: age, signing, witnesses, handwritten wills and self-proving affidavits.

Short answer: Anyone 18 or older who is of sound mind and memory may make a will. The will must be in writing, signed by the will-maker (or by someone in their presence and at their direction), and attested in the will-maker's presence by two or more credible witnesses. 755 ILCS 5/4-1, 5/4-3

Requirements for a valid willAnyone 18 or older who is of sound mind and memory may make a will. The will must be in writing, signed by the will-maker (or by someone in their presence and at their direction), and attested in the will-maker's presence by two or more credible witnesses.
Handwritten (holographic) willsNo. Illinois has no exception for handwritten wills: every will must be attested by at least two credible witnesses, so an unwitnessed handwritten will is not valid as a will.
Self-proving affidavitIllinois does not use a notarized self-proving affidavit. Instead, a will can be proved without witness testimony through an attestation clause signed by the two witnesses, or a witness affidavit signed at or after signing and attached to the will, stating that they saw the will-maker sign (or heard them acknowledge it), signed in the will-maker's presence, and believed the will-maker to be of sound mind and memory.

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FAQ

What makes a will valid in Illinois?
Anyone 18 or older who is of sound mind and memory may make a will. The will must be in writing, signed by the will-maker (or by someone in their presence and at their direction), and attested in the will-maker's presence by two or more credible witnesses.
Is a handwritten will valid in Illinois?
No. Illinois has no exception for handwritten wills: every will must be attested by at least two credible witnesses, so an unwitnessed handwritten will is not valid as a will.
Does a will need to be notarized in Illinois?
Illinois does not use a notarized self-proving affidavit. Instead, a will can be proved without witness testimony through an attestation clause signed by the two witnesses, or a witness affidavit signed at or after signing and attached to the will, stating that they saw the will-maker sign (or heard them acknowledge it), signed in the will-maker's presence, and believed the will-maker to be of sound mind and memory.

General legal information, not legal advice. Laws change and local rules can differ; check the linked official source or talk to a lawyer about your situation.