Intestate Succession in Illinois: What Happens If You Die Without a Will

Roughly 60% of American adults do not have a will. In Illinois, dying without one means the state decides who inherits your assets — not your family, not your wishes, and not common sense. The division follows a rigid statutory formula under 755 ILCS 5/2-1 that cannot be adjusted for individual circumstances.

The results regularly surprise families, especially those in second marriages or with stepchildren.

The Illinois Intestacy Rules

Illinois distributes the estate of someone who dies without a will (dying "intestate") based on which surviving relatives exist:

Surviving spouse and descendants (children, grandchildren): The spouse receives one-half of the estate. The descendants split the other half equally, with shares passing down by representation if a child predeceased the decedent.

Surviving spouse, no descendants: The spouse inherits the entire estate.

Descendants, no surviving spouse: The descendants split the entire estate equally, by representation.

No spouse, no descendants: The estate passes to the decedent's parents in equal shares. If only one parent survives, that parent takes the full amount.

No spouse, no descendants, no parents: The estate divides equally among the decedent's siblings (and their descendants by representation).

No close relatives at all: The estate continues outward — to grandparents, then aunts and uncles, then first cousins. If no blood relatives can be located, the estate escheats to the state of Illinois.

Where Intestacy Creates Problems

Blended Families

This is where the damage is most severe. Under the 50/50 split between a surviving spouse and descendants, a parent in a second marriage who dies without a will leaves half their estate to their current spouse and half to their biological children from all relationships.

The surviving spouse has no legal obligation to pass their half to the stepchildren later. And the biological children from a prior marriage may resent splitting assets with a step-parent they barely know. The result is often a family conflict that a simple will would have prevented.

Unmarried Partners

Illinois intestacy law does not recognize unmarried partners, regardless of how long the couple has lived together. A partner of 20 years inherits nothing — the estate passes to blood relatives instead.

Minor Children

If both parents die without a will, the court appoints a guardian for minor children. Without a will nominating someone, the judge chooses based on available information — which may or may not align with what the parents would have wanted. Extended family members can contest each other's petitions, adding legal fees and emotional strain.

Stepchildren and Adopted Children

Stepchildren who were never legally adopted have no inheritance rights under Illinois intestacy law. Adopted children are treated identically to biological children. This distinction matters in blended families where a step-parent has raised children for years but never formalized the adoption.

What Intestacy Does Not Control

The intestacy formula only applies to assets that go through probate. Assets with existing beneficiary designations, joint tenancy property, POD bank accounts, TOD investment accounts, and property covered by a recorded Transfer on Death Instrument all pass outside the intestacy rules.

This means a family could have a situation where the probate estate goes 50/50 between the spouse and children under intestacy, but the retirement accounts (with the spouse as sole beneficiary) and the house (held in joint tenancy) both go entirely to the spouse. The actual distribution depends entirely on how each asset is titled and designated — not on a single unified rule.

Avoiding Intestacy

A valid Illinois will overrides the intestacy formula entirely. The testator can leave specific assets to specific people, name a guardian for minor children, waive the executor bond requirement, and authorize independent administration (which reduces court oversight and legal costs).

The Illinois Basic Estate Planning Kit includes will execution instructions with the exact witness and notary requirements, plus an asset inventory worksheet that maps every account, property, and policy to its current beneficiary or titling — so you can see exactly what intestacy would do to your estate and fix the gaps.

See more Illinois guides →