Probate in Illinois: how it works and how to avoid it
A plain-English guide to the Illinois probate process, when court administration is required, the small estate affidavit, and the assets that pass outside probate altogether.
This page is general information about probate in Illinois, not legal advice. Estate law is fact-specific and changes over time, so please consult a licensed Illinois attorney before acting on anything here. Statutory references point to the Illinois Probate Act of 1975 (755 ILCS 5) and related Illinois law as of the review date above.
Probate is the court process that settles a person's estate after death: proving any will, appointing someone to act, paying valid debts and taxes, and transferring what is left to the right people. In Illinois, that process runs through the Circuit Court, and for residents of Chicago and surrounding suburbs, through the dedicated Probate Division of the Circuit Court of Cook County, which sits at the Richard J. Daley Center and is one of the busiest probate courts in the United States.
When probate is required in Illinois
Not every estate has to go through probate. Under Illinois practice, court administration is generally required when either of the following is true:
The estate includes real estate titled in the decedent's name alone that is not otherwise set up to transfer automatically, or
The estate holds personal property above the small estate ceiling that does not pass by beneficiary designation, joint ownership, or trust.
That ceiling matters, and it recently changed. Through Public Act 104-0346, Illinois raised the small estate affidavit limit from $100,000 to $150,000 in personal property, effective for deaths on or after 15 August 2025. For deaths before that date, the older $100,000 cap still applies. Real estate cannot pass by small estate affidavit at all, so a solely owned home or parcel typically pushes an estate into probate regardless of its value.
The small estate affidavit
For many modest estates, Illinois offers a faster path that avoids opening a court case. The small estate affidavit, governed by 755 ILCS 5/25-1, lets a successor collect and distribute a decedent's personal property by signing a sworn statement rather than petitioning the court.
You can generally use it when no probate estate has been opened and none is planned, the personal property is at or below the current ceiling (now $150,000, not counting Illinois-registered vehicles for qualifying deaths), and you are prepared to account for the decedent's debts and funeral expenses out of what you collect. It does not work for real estate. Banks, transfer agents, and other holders usually accept a properly completed affidavit to release accounts and assets.
Letters of office
When a full estate is opened, the court appoints a personal representative and issues letters of office, the court-sealed document that proves authority to act. There are two forms:
Letters testamentary when there is a valid will and the named executor is appointed.
Letters of administration when there is no will, or no executor able to serve, and the court appoints an administrator.
The representative uses these letters with banks, insurers, and government agencies to gather assets, pay claims, and ultimately distribute the estate.
Independent vs supervised administration
Illinois recognises two modes of running an estate, and the difference shapes cost, speed, and privacy.
Independent administration
This is the default and by far the most common in Illinois. The court appoints the representative and then steps back, letting them carry out the will or the intestacy rules without seeking approval at each step. Many uncontested independent estates require only two court appearances by the estate's attorney, one to open and one to close. Less court involvement usually means lower cost and a faster close.
Supervised administration
Here the court oversees nearly every step. The representative must file the estate's inventory, accountings, and other sensitive information with the court and obtain approval before major actions. Supervision is more common when there is conflict among heirs, concern about the representative, or a specific request for closer oversight. It adds time and expense but adds protection.
The representative's duties
Whether independent or supervised, an Illinois representative owes fiduciary duties to the estate and its beneficiaries. Core tasks include:
Gathering and securing the decedent's assets and preparing an inventory.
Giving notice to heirs, legatees, and known and unknown creditors.
Paying valid debts, funeral and administration expenses, and any taxes due.
Keeping estate funds separate and maintaining accurate records.
Distributing what remains according to the will or Illinois intestacy law, and closing the estate.
The six-month claims period
A defining feature of Illinois probate is the creditor claims window. After letters of office issue, the representative publishes notice to creditors. Claims not properly filed within six months of first publication (and within the period for individually notified creditors) are generally barred, regardless of their underlying validity. Because this six-month period is built into the statute, even a simple, uncontested estate usually cannot fully distribute and close before it runs.
Assets that pass outside probate
Much of an estate can skip probate entirely if it is set up to transfer by operation of law or contract. Common non-probate transfers in Illinois include:
Revocable living trusts. Assets retitled into a properly funded trust pass under the trust terms, not through court. A will alone does not avoid probate; it is a set of instructions to the probate court.
Joint tenancy with right of survivorship. Jointly held property passes to the surviving owner automatically.
Payable-on-death (POD) and transfer-on-death (TOD) designations. Bank and brokerage accounts with named beneficiaries pass directly to them.
Beneficiary designations on life insurance and retirement accounts.
Transfer on Death Instrument for real estate. Under the Illinois Real Property Transfer on Death Instrument Act (755 ILCS 27), an owner can record an instrument that passes residential real property directly to a named beneficiary at death, skipping probate for that property. It must be signed, witnessed by two credible witnesses, notarised, and recorded before death to be effective.
These tools are the heart of most Illinois plans to avoid probate. They only work if titling and beneficiary forms are kept current, which is a common gap when accounts or family circumstances change.
Timeline and costs
A typical Illinois estate takes roughly 6 to 18 months to administer, with the six-month claims period setting a practical floor. Larger or contested estates run longer. Costs commonly cited for full administration fall in the range of 4 to 8 percent of the estate's value once court filing fees, publication, bond (if required), and attorney and representative compensation are added up. On a $500,000 estate, that range can represent tens of thousands of dollars, much of which careful non-probate planning may reduce or avoid. Figures vary widely by county and complexity; treat them as planning ranges, not quotes.
Where Afterlife AI™ fits
Afterlife AI™ does not administer estates and is not a substitute for an executor, an attorney, or the court. What it offers is Executor Lock™, a product feature that lets you record, while you are alive, who you trust to carry your wishes and what you want them to know, then lock those instructions so they cannot be quietly altered later. That is a clarity and continuity tool, separate from any legal appointment such as an Illinois executor or administrator. Naming someone in Executor Lock™ does not give them legal authority; that still comes from a valid will and letters of office issued by the court. Used alongside proper estate planning, it helps the people you choose act with less confusion when the time comes.
Afterlife AI™ also lets you build a Persona for free: 60 memories and 100 conversations as a one-time build budget, no card and no time limit, plus one Trusted Contact and Executor Lock™ setup kept at no cost. If you choose, you can later add a consent-based voice you record of yourself while alive, governed and locked at Executor Lock™, so the people you love can choose to hear you again on the Legacy plan ($14.99/mo) or Eternal plan ($29.99/mo).
Frequently asked questions
See the questions below for quick answers on thresholds, timing, and avoiding probate in Illinois. As above, this is general information, not legal advice; consult an Illinois attorney about your situation.