Illinois inheritance laws work on two tracks: if the person who died left a valid will, that document controls; if not, the state’s intestate succession rules decide who takes what. On top of either track sits the probate process, a set of creditor rules, and an Illinois estate tax that kicks in above $4 million. Inheritance itself is not taxed to the person who receives it.
Who Inherits When There Is No Will
When an Illinois resident dies without a will, the estate passes according to a strict family hierarchy. The court does not consider what the deceased person might have wanted.
If a spouse and descendants (children, grandchildren, or further generations) both survive, the estate is split in half: one-half to the spouse, one-half divided among the descendants. A surviving spouse with no descendants inherits everything. Descendants with no surviving spouse take the entire estate.1FindLaw. Illinois Code 755 ILCS 5/2-1 – Rules of Descent and Distribution
With no spouse and no descendants, the estate passes to the deceased person’s parents and siblings in equal shares. A surviving parent receives a double share if the other parent has died. A sibling who died before the deceased is represented by their own children, who split that sibling’s portion.1FindLaw. Illinois Code 755 ILCS 5/2-1 – Rules of Descent and Distribution
Adopted, Half, and Stepchildren
Legally adopted children inherit exactly as biological children do, both from the adoptive parent and from that parent’s relatives. Half-siblings inherit the same as full siblings; the statute draws no distinction.1FindLaw. Illinois Code 755 ILCS 5/2-1 – Rules of Descent and Distribution
Stepchildren and foster children do not inherit under the intestate rules unless the deceased person legally adopted them. A stepparent who raised a child for decades but never completed a formal adoption leaves that child with no automatic right to anything. A child conceived before the parent’s death but born afterward does qualify as a full heir.
If no qualifying relatives can be found at any level, the estate escheats to the State of Illinois. Courts search carefully for heirs before that happens, but for anyone with no known family, a will or trust is the only way to direct where property ends up.
When There Is a Will
A valid will overrides intestate succession and lets you direct property to anyone: family, friends, or charities. Illinois requires the will to be in writing, signed by the testator (or by someone at their direction and in their presence), and witnessed by at least two credible witnesses who also sign in the testator’s presence.2Illinois General Assembly. Illinois Code 755 ILCS 5/4-3 – Signing and Attestation
Illinois does not recognize handwritten wills that lack proper witnesses, no matter how clear the handwriting or intent. If a will fails the formal requirements, the court treats the estate as intestate.
The Spouse Cannot Be Fully Disinherited
Even a valid will cannot cut a surviving spouse out entirely. The spouse has the right to renounce the will and take a statutory share instead. The renunciation must be filed in writing with the probate court within seven months of the will being admitted to probate.3Illinois General Assembly. Illinois Code 755 ILCS 5/2-8 – Renunciation of Will by Spouse
The share is one-third of the estate (after debts and claims) if the deceased left descendants, and one-half if not.3Illinois General Assembly. Illinois Code 755 ILCS 5/2-8 – Renunciation of Will by Spouse These shares are smaller than the intestate shares. Renunciation is a protective floor against disinheritance, not a way to increase what the spouse would otherwise get.
When a Named Beneficiary Dies First
If someone named in your will dies before you do, the gift normally lapses back into the estate. Illinois has an anti-lapse statute that saves the gift in some cases involving related beneficiaries, letting their descendants step in. The rule does not apply to non-relatives, so if you want a friend’s share to pass to their children, name a backup beneficiary directly in the will.
Assets That Never Enter Probate
Much of what people own passes outside of probate. These transfers happen automatically at death based on how the asset is titled, and they override anything the will says.
- Property held in joint tenancy with right of survivorship passes to the surviving owner the moment the other owner dies.4Illinois Department of Human Services. PM 07-02-02 – Jointly Held Assets
- Life insurance, 401(k) plans, IRAs, and similar accounts pay out to whoever is named on the beneficiary paperwork.
- Assets held in a living trust are distributed under the trust document, without probate.
- Bank accounts with a payable-on-death designation and brokerage accounts with a transfer-on-death registration go directly to the named person.
Stale beneficiary designations are the most common source of unintended inheritances. If your will says a retirement account goes to your daughter, but the account paperwork still names an ex-spouse, the ex-spouse receives the money. Federal law governing employer-sponsored retirement plans and group life insurance gives the named beneficiary top priority, and a will cannot change that. Review these designations after any marriage, divorce, or birth.
How Probate Works in Illinois
Probate is the court-supervised process of settling the estate: verifying the will, appointing someone to manage things, identifying assets and debts, paying creditors, and distributing what remains.
Independent vs. Supervised Administration
Independent administration is the default. The executor, called the independent representative, handles most tasks without returning to court for permission at each step. The court grants it automatically unless the will forbids it, a minor or disabled beneficiary needs extra protection, or an interested party asks for supervision. Most Illinois estates follow this track because it is faster and cheaper.
Supervised administration requires court approval for significant actions like selling real estate or making distributions. It adds time and legal cost, but provides more oversight when beneficiaries disagree or the estate is complex.
The Small Estate Affidavit
Not every estate needs formal probate. Under 755 ILCS 5/25-1, if the total value of the deceased person’s property (excluding vehicles) is $150,000 or less, heirs can collect assets using a small estate affidavit. At least 60 days must pass after death, and no probate case can already be pending. The heir presents the sworn affidavit directly to whoever holds the asset, such as a bank.
What the Executor Does
The person managing the estate owes a fiduciary duty to beneficiaries and creditors. Core tasks include:
- Opening the estate by filing the petition, submitting the death certificate and original will, and obtaining letters of office.
- Locating and valuing all property, including real estate, bank accounts, investments, and personal items.
- Giving legal notice to known and potential creditors.
- Paying valid debts, filing the deceased person’s final income tax return, and handling any estate tax obligations.
- Distributing what remains to beneficiaries or heirs and filing a final accounting.
An executor who distributes assets before paying debts and taxes can be held personally liable for those unpaid obligations.5eCFR. 26 CFR 20.2002-1 – Liability for Payment of Tax If the IRS later assesses estate tax after inheritances have gone out the door, the executor’s own money is on the line.
Debts Left Behind
Family members are generally not personally responsible for a deceased relative’s debts. Those debts are paid from the estate before anything reaches heirs.6Federal Trade Commission. Debts and Deceased Relatives If the estate lacks the money, some debts simply go unpaid.
The exceptions: you can be liable if you co-signed the debt, if you were legally responsible for administering the estate and failed to follow proper procedures, or if a state law imposes spousal liability for specific obligations such as medical expenses.6Federal Trade Commission. Debts and Deceased Relatives
Claim Deadlines for Creditors
Once the executor gives proper notice, known creditors generally have three months to file a claim and unknown creditors have six months. Creditors who receive no notice at all face an outer deadline of two years from the date of death. After these periods, claims are barred and the executor can distribute what is left. State law sets a priority order for payment: funeral and burial costs, administrative expenses, and taxes come first, followed by other obligations. Beneficiaries take only what remains.
Illinois Estate Tax and the $4 Million Threshold
Illinois does not have an inheritance tax. You owe nothing to the state simply for receiving an inheritance. The old state inheritance tax was repealed for deaths on or after January 1, 1983.7Illinois Attorney General. Estate Taxes
Illinois does levy an estate tax, paid by the estate before assets are distributed. The exemption is $4 million.8Illinois Attorney General. Estate Tax Instruction Fact Sheet Estates below that threshold owe nothing. Unlike the federal exemption, the Illinois figure is not indexed for inflation and has stayed at $4 million for years.
Estates above the exemption are taxed at graduated rates running from 0.8% on the first taxable dollars up to 16% on amounts above roughly $10 million.9Illinois Attorney General. State Death Tax Credit Table Watch for the cliff: once an estate exceeds $4 million, the tax applies to the entire taxable amount above a much lower base, not just the amount over $4 million. A $4.1 million estate does not owe tax on only $100,000. The effective tax on estates just over the threshold can be sharp, which is why planning matters most for people sitting near that line.
The Illinois estate tax return is due nine months after the date of death, the same deadline as the federal return.10eCFR. 26 CFR 20.6075-1 – Returns; Time for Filing Estate Tax Return Extensions are available but must be requested before the deadline.
Federal Estate Tax Sits Much Higher
For deaths in 2026, the federal estate tax filing threshold is $15 million per individual.11Internal Revenue Service. Estate Tax A married couple can potentially shelter up to $30 million by using portability, which lets a surviving spouse claim the deceased spouse’s unused exemption. Preserving that option requires filing a federal estate tax return (Form 706) even when no tax is owed, within five years of the death.
The gap between the $4 million Illinois exemption and the $15 million federal exemption means many Illinois estates owe state tax but no federal tax. Credit shelter trusts, lifetime gifting, and irrevocable life insurance trusts are common tools for reducing exposure in that range. On the gifting side, for 2026 you can give up to $19,000 per recipient per year without filing a gift tax return or touching your lifetime exemption; a married couple can combine to $38,000 per recipient.12Internal Revenue Service. What’s New – Estate and Gift Tax Payments made directly to a school for tuition or to a provider for medical expenses are unlimited and do not count against the annual exclusion.