Article Summary
When an Illinois resident dies without a valid will, their estate is distributed under the state's intestate succession laws (755 ILCS 5/2-1). These laws follow a fixed formula based on family relationships — spouse, children, parents, siblings — with no regard for your actual wishes, personal relationships, or financial needs.
The core rule: if you leave behind a spouse and children, each gets half. If only a spouse survives, the spouse inherits everything. If only children survive, they split everything equally. The further down the family tree the law must travel to find heirs, the more surprising the outcomes often are.
This guide explains exactly how Illinois intestate succession works, walks through who inherits in every common scenario, covers special situations like blended families and unmarried partners, and explains why even a simple will gives you far more control over your estate.
Illinois Intestate Succession at a Glance
| Situation | Surviving Spouse | Children | Other Heirs |
|---|---|---|---|
| Spouse + children survive | ½ of estate | ½ of estate split equally | Nothing |
| Spouse survives, no children | Entire estate | N/A | Nothing |
| Children survive, no spouse | N/A | Entire estate split equally | Nothing |
| No spouse, no children | N/A | N/A | Parents equally (or surviving parent) |
| No spouse, children, or parents | N/A | N/A | Siblings equally (or their descendants) |
| No close family at all | N/A | N/A | Distant relatives or escheats to Illinois |
Source: 755 ILCS 5/2-1. “Descendants” includes grandchildren if a child predeceased the decedent (they inherit their parent's share by representation).
What Is Intestate Succession in Illinois?
When a person dies without a valid will — or with a will that fails to dispose of all their property — their assets pass under Illinois's law of intestate succession. The governing statute is 755 ILCS 5/2-1, which sets out a fixed priority order of heirs based solely on family relationships. No matter how close you were to someone, no matter what they promised you during their lifetime, and no matter what a deceased person actually wanted — intestate succession ignores all of that and applies the state's default formula.
Intestate succession applies only to probate assets — property held in the decedent's name alone at death, with no automatic transfer mechanism. Assets with a named beneficiary (life insurance, retirement accounts, payable-on-death accounts), property held in joint tenancy with right of survivorship, real estate covered by a Transfer-on-Death Instrument, and assets held in a living trust all pass outside of intestate succession entirely, regardless of what the law says.
Dying without a will is called dying “intestate”
The word “intestate” simply means dying without a valid will. Illinois law uses it throughout the Probate Act (755 ILCS 5). If your estate goes through intestate succession, it will go through probate court — where a judge appoints an administrator (rather than an executor you named), supervises asset distribution, and applies the default inheritance rules. Learn more about the probate process in our Illinois probate timeline guide.
Who Inherits Under Illinois Intestate Succession Laws
Illinois intestate succession follows a precise priority order. The law starts at the top of the family tree and works down. Once a class of heirs is found to exist, lower-priority relatives receive nothing — even if a closer relationship might have existed in practice.
The Surviving Spouse
A surviving spouse is always at the top of the Illinois intestate hierarchy — but how much the spouse receives depends entirely on whether the decedent also left surviving descendants.
Spouse Only (No Children)
If the decedent is survived by a spouse but no descendants (children, grandchildren, etc.), the surviving spouse inherits the entire probate estate. Parents, siblings, and all other relatives receive nothing.
755 ILCS 5/2-1(b): “to the surviving spouse” when no descendant survives.
Spouse + Children
If both a spouse and descendants survive, the estate is split: the surviving spouse receives one-half, and the other half goes to the decedent's descendants equally. This often surprises blended families — children from a prior marriage get their full share.
755 ILCS 5/2-1(a): “½ to the surviving spouse and ½ to the descendants.”
The half-and-half split when a spouse and children both survive is one of the most important — and most misunderstood — aspects of Illinois intestate law. Many people assume a surviving spouse automatically inherits everything. Under Illinois law, that is only true when there are no surviving children or other descendants. If there are children, the spouse must share — and if the estate is illiquid (for example, largely composed of a family home), that forced sharing can require a sale or court proceeding to resolve.
Children and Descendants
When no spouse survives, the entire probate estate passes to the decedent's descendants — a legal term that includes children, grandchildren, great-grandchildren, and further generations. Illinois uses a system called per stirpes (or “by representation”) distribution, which means:
Living children share equally
If the decedent had three living children and no surviving spouse, each child inherits one-third of the probate estate. Simple and equal.
A deceased child's share drops to their children
If one of those three children predeceased the parent but left their own children (the decedent's grandchildren), the deceased child's one-third share passes to those grandchildren equally. They "step into" their parent's shoes.
All children share equally regardless of birth circumstances
Illinois does not distinguish between children born during a marriage, children born outside marriage (provided paternity is established), and legally adopted children. All inherit equally.
Parents, Siblings, and Extended Family
If a decedent dies with no surviving spouse and no surviving descendants, the estate moves further up and then across the family tree, following this priority ladder under 755 ILCS 5/2-1:
Illinois Intestate Priority Order: No Spouse or Children
Special Situations Under Illinois Intestate Law
Real families rarely fit a clean textbook scenario. Illinois intestate law includes specific rules for common complications.
Children Born Outside Marriage
Under 755 ILCS 5/2-2, a child born outside of marriage always inherits from and through their mother. To inherit from the father, paternity must be legally established — through voluntary acknowledgment, a court order, or the parents' subsequent marriage. Once established, the child inherits identically to any child born during marriage. Illinois does not use the outdated term "illegitimate."
Adopted Children
Legally adopted children inherit from and through their adoptive parents exactly as biological children do (755 ILCS 5/2-4). They do not inherit from their biological parents once the adoption is final. Stepchildren who were never legally adopted are not considered "children" under intestate succession and receive nothing unless named in a will.
Half-Siblings
Half-siblings — those who share only one parent with the decedent — inherit the same share as full siblings under Illinois intestate law. There is no half-share reduction. A half-brother and full sister inherit equally.
Posthumous Children
A child conceived before the decedent's death but born after the death is treated as if they were alive at the time of death for inheritance purposes (755 ILCS 5/2-3). Their share of the estate is preserved until birth.
The Simultaneous Death Problem
If a spouse and the decedent die in the same event and it cannot be determined who survived the other, Illinois law treats each as having predeceased the other for inheritance purposes (755 ILCS 5/2-8). The decedent's estate passes as if no spouse survived — going instead to the decedent's other heirs. This is why well-drafted wills include survival clauses.
Assets That Pass Outside of Intestate Succession
One of the most important concepts in estate planning — and one that surprises many families — is that not all assets are subject to intestate succession. A significant portion of most estates passes outside of probate entirely, directly to named beneficiaries regardless of what any will (or the intestate laws) says.
Life insurance policies
Pass directly to named beneficiaries. Intestate law does not apply.
401(k), IRA, and retirement accounts
Go to the designated beneficiary on file with the plan administrator.
Payable-on-death (POD) bank accounts
Transfer to the named beneficiary upon presentation of a death certificate.
Transfer-on-death (TOD) brokerage accounts
Pass directly to the named beneficiary without probate.
Joint tenancy property
Passes automatically to the surviving joint tenant(s) by operation of law.
Assets in a living trust
Distributed by the successor trustee according to the trust terms — no court involved.
Illinois Transfer-on-Death Instruments
Real estate with a TODI recorded with the county passes to the named beneficiary automatically.
For many Illinois families, these non-probate assets make up the majority of the estate's value. But that does not mean intestate succession is irrelevant — any asset held solely in your name with no beneficiary designation will go through probate and follow the intestate rules. Real estate without a TODI, individually-held bank accounts without a POD designation, vehicles, personal property, and business interests all fall into this category.
Beneficiary designations override your will — and intestate succession
Even if you have a will naming a specific person to receive your IRA, the beneficiary designation on the IRA controls — not the will, and not intestate succession. Outdated beneficiary designations (naming an ex-spouse, a deceased parent, or no one) are one of the most common and costly estate planning mistakes in Illinois. Read our guide on why beneficiary designations override your will in Illinois.
What Intestate Succession Cannot Do for Your Family
Even setting aside the question of whether the default distribution matches your wishes, intestate succession has fundamental structural limitations that a will can address. Here are five things the intestate rules simply cannot do.
No control over who receives your assets
Intestate succession distributes your estate to whoever Illinois law specifies — not whoever you would choose. A beloved sibling receives nothing if you have a spouse and children. A charity you supported receives nothing at all. Estranged relatives may inherit property you would never voluntarily leave them.
No protection for minor children
A will lets you name a guardian for your minor children and set up a trust to manage inherited money until they reach adulthood. Without a will, a court appoints a guardian — possibly not the person you would choose — and children may receive a lump sum at age 18 with no restrictions on how they spend it.
No specific bequests
Intestate succession distributes your estate in fractional shares of cash and property — it cannot give a specific item (your grandmother's ring, your car, your business) to a specific person. Every probate asset goes into the pot and gets divided by formula.
No protection for unmarried partners
Illinois intestate succession law does not recognize unmarried partners — no matter how long you have been together. A long-term partner who shared your home and life receives nothing under default inheritance rules unless they are specifically named in a will or other estate planning document.
No tax or creditor planning
A well-drafted will can include provisions to minimize Illinois estate tax (which applies to estates over $4 million), protect inherited assets from a beneficiary's creditors, or provide for a special needs beneficiary without disqualifying them from government benefits. Intestate succession offers none of these tools.
Want to Control Who Inherits Your Estate?
Illinois Estate Law helps Chicago-area families create wills and trusts that put them in control — protecting spouses, providing for children on your terms, and keeping assets away from people you would never choose as heirs. Flat-fee pricing means you always know the cost upfront.
Why a Will Beats the Default Intestate Rules
A will does not just change who gets what — it gives you a level of control, flexibility, and protection that intestate succession simply cannot offer. Here is a side-by-side comparison of the two approaches.
Without a Will (Intestate)
- ✗State formula controls who inherits
- ✗Spouse may share estate with children
- ✗Unmarried partner receives nothing
- ✗Court appoints an administrator you did not choose
- ✗No guardian named for minor children
- ✗No trust protection for young or vulnerable heirs
- ✗No specific bequests to individuals or charities
- ✗No estate tax or creditor planning
With a Valid Will
- ✓You decide exactly who receives what
- ✓Spouse can inherit the full estate if that is your wish
- ✓Unmarried partner can be named as a beneficiary
- ✓You name the executor you trust to administer your estate
- ✓You designate a guardian for your minor children
- ✓Testamentary trusts protect children until adulthood
- ✓Specific items can go to specific people
- ✓Charitable gifts, tax provisions, and special needs trusts are possible
For most Illinois families, a complete estate plan goes beyond just a will. A revocable living trust avoids probate entirely, a durable power of attorney protects you during incapacity, and properly updated beneficiary designations on financial accounts keep assets out of the probate estate altogether. Together, these tools give you and your family far more control than any default state formula ever could.
Frequently Asked Questions
Next Steps
Whether you are researching what will happen to your estate if you die tomorrow, navigating the intestate estate of a loved one who passed, or using this as a wake-up call to finally create your own will — the path forward is the same: act before it is too late to choose.
If you are currently administering an intestate estate in Illinois, see our guides on when probate is required in Illinois, how long probate takes, and the executor's comprehensive guide. If you want to create a will or complete estate plan before the default rules apply to you, our Chicago will drafting services and revocable trust services pages explain your options.
Speak With an Illinois Estate Planning Attorney
Illinois Estate Law helps Chicago-area individuals and families create wills, trusts, and complete estate plans that reflect their actual wishes — not the state's default formula. A free consultation takes less than an hour and could save your family years of uncertainty.
Call (312) 373-0731 to speak directly with our team.
Related Illinois Estate Planning Guides
Mary Liberty — Chicago Estate Planning Attorney
Mary Liberty is a Chicago-based estate planning and probate attorney dedicated to making legal planning accessible, affordable, and stress-free. Through her modern virtual law practice, she helps families and individuals across Illinois create clear, effective plans that protect their assets and their loved ones.
Mary focuses on estate planning, uncontested probate, and her signature partial probate service. Known for her precision, empathy, and plain-language guidance, she operates on a 100% flat-fee model so clients always know exactly what to expect.
Disclaimer: This article is for informational purposes only and does not constitute legal advice. No attorney-client relationship is created by reading this content. Illinois inheritance and intestate succession law is complex and fact-specific — outcomes vary based on individual family circumstances, asset structure, and applicable statutes. Consult a licensed Illinois attorney for guidance tailored to your situation.
Ready to Write Your Own Inheritance Rules?
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