What Makes a Will Legally Valid in Illinois? Key Requirements Orland Park Residents Should Know

Michelle Morrone • August 31, 2026

Illinois residents who want to protect their families often wonder what a valid will actually requires. In Cook County communities like Orland Park, those details decide whether a will holds up in probate court. Working with a local wills attorney serving Orland Park, IL, ensures your document meets every requirement under Illinois law before it is ever needed.


Illinois draws its will requirements from the Probate Act of 1975. Missing even one element can cause a court to treat your will as if it never existed. Learn how Morrone & Morrone PC approaches estate planning by reading client reviews and getting directions on Google.

Older couple reviewing and signing a will document

The Core Requirements That Make an Illinois Will Legally Valid

A legally valid Illinois will must meet four foundational requirements under state law. Each one is mandatory.


You Must Be at Least 18 Years Old

Under 755 ILCS 5/4-1, any person who is 18 or older may make a will. Emancipated minors may also qualify, but for most Orland Park residents, the standard rule applies.


You Must Be of Sound Mind

Illinois law requires the person making the will to be of "sound mind and memory." In plain terms, you must understand what a will is, what you own, who your family members are, and what you intend to do with your assets. Someone previously declared legally incompetent may face challenges on this basis.


The Will Must Be in Writing

An oral will carries no legal weight in Illinois. The document must be written, whether typed, printed, or handwritten. No specific format is required, but it must exist on paper.


Two Credible Witnesses Must Sign

Illinois law requires two credible witnesses to sign the will in the presence of the person making it. They confirm they observed the signing and that the person appeared to understand what they were doing. Witnesses need not read the will or know its contents.


A witness who is also a beneficiary may risk losing that inheritance. Under Section 4-6 of the Probate Act, a legacy left to an attesting witness can be challenged or reduced. Witnesses should be people who receive nothing under the will. A local wills attorney serving Orland Park, IL, can help you identify appropriate witnesses and avoid this common mistake.

What About Notarization and Handwritten Wills?

Notarization Is Not Required to Make a Will Valid in Illinois

Illinois law does not require notarization for a will to be legally valid. The three core execution requirements are writing, the testator's signature, and two witnesses. Still, many attorneys recommend a notarized self-proving affidavit, which lets the probate court accept the will without tracking down witnesses later. It does not change validity but simplifies probate for your family. A local wills attorney serving Orland Park, IL, can prepare the affidavit alongside your will so both are executed correctly the first time.

 Reach out through the contact page if you have questions about the execution process.


Illinois Does Not Recognize Handwritten Wills Without Witnesses

A holographic will is written entirely in the testator's handwriting but not signed by witnesses. Many states accept them. Illinois does not. Without the required two witness signatures, a handwritten will is not recognized in Illinois probate court, however clearly it expresses the writer's wishes.

How a Will Compares to a Living Trust and Power of Attorney

A will is essential, but not the only tool. A living trust transfers assets directly to beneficiaries without probate, which is often faster, more private, and simpler for your heirs. A will must clear the Cook County probate process before assets are distributed. Explore both options on the firm's Wills and Trusts service page.


A power of attorney authorizes someone to make financial or healthcare decisions on your behalf while you are still alive. A will only takes effect after death. Neither document replaces the other, and many complete estate plans include both. A local wills attorney serving Orland Park, IL, can help you determine which combination fits your family's circumstances.

Frequently Asked Questions About Illinois Wills

  • Does My Illinois Will Need to Be Notarized to Be Legal?

    No. Illinois law does not require notarization. A notarized self-proving affidavit is still recommended, since it can eliminate the need to contact witnesses after the testator's death.

  • Can a Family Member Witness My Will in Illinois?

    A family member may serve as a witness but should not be a beneficiary under the will. If a witness also stands to inherit, that inheritance could be challenged under Probate Act Section 4-6. Choosing independent, disinterested witnesses is the safer approach.

  • What Happens If My Will Does Not Meet Illinois Requirements?

    If a will fails to meet statutory requirements, an Illinois court may treat the estate as if no will existed. State intestacy laws would then determine who inherits your property, which may not reflect your wishes. Family members you intended to provide for may receive nothing.

  • Is a Will Enough, or Do I Also Need a Trust?

    It depends on your goals. A will covers assets that must go through probate and is essential for naming guardians for minor children. A living trust can help certain assets bypass probate entirely. Many Orland Park families use both tools together as part of a broader estate plan.

Take the Next Step Toward Protecting Your Family

A valid Illinois will is one of the most important documents you can have, and getting it right from the start matters. Working with a local wills attorney serving Orland Park, IL, means your will is drafted and witnessed correctly from day one. Morrone & Morrone PC serves Orland Park, IL, families with experienced, personalized guidance on wills, trusts, and estate planning. Call (708) 653-3151 to schedule a free initial consultation.

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