Cook County Probate Petition Forms & Filing Guide

If you're dealing with the loss of a loved one in Cook County and need to handle their estate through the court system, understanding the probate petition forms is where everything starts. These forms are the legal doorway to getting appointed as executor or administrator, gaining authority over estate assets, and carrying out the decedent's wishes or Illinois law if there's no will. Filing the wrong form, missing a required attachment, or skipping a step can delay the process by weeks or even months. This guide breaks down exactly what you need to know about Cook County probate petition forms, how to fill them out, and how to file them without running into avoidable problems.

What forms do you need to open a probate case in Cook County?

Cook County follows Illinois probate statutes, so the forms used here align with those outlined in the Illinois Probate Act of 1975. The specific forms you'll need depend on the type of probate proceeding you're initiating. The most common petition forms include:

Petition for Probate of Will and for Letters Testamentary filed when the decedent left a valid will and you're asking the court to admit it to probate and appoint the named executor.
Petition for Letters of Administration filed when there is no will and someone is asking to be appointed as the estate's administrator.
Petition for Letters of Administration with Will Annexed used when a will exists but the named executor is unable or unwilling to serve.
Small Estate Affidavit not technically a petition, but an alternative to full probate for estates under certain thresholds. If you're unsure whether a small estate affidavit applies to your situation, comparing the small estate affidavit to a full probate petition can help you decide.

Each petition form requires supporting documents. At a minimum, you'll typically need the original death certificate, the original will (if one exists), a statement of the decedent's assets and liabilities, and information about known heirs and beneficiaries. Cook County's probate division may also require a proposed executor's acceptance and oath, along with a surety bond if applicable.

Where do you file probate petitions in Cook County?

Cook County probate petitions are filed with the Cook County Circuit Court, Probate Division, located at the Richard J. Daley Center in downtown Chicago. The Probate Division handles all estate matters for decedents who were residents of Cook County at the time of their death, or who owned real estate within the county.

You can file in person at the clerk's office or, in some cases, through electronic filing (e-filing) as permitted by Illinois Supreme Court rules. E-filing is now mandatory for represented parties in Cook County and optional but increasingly common for self-represented filers. If you're filing electronically, you'll need to use an approved e-filing service provider listed on the Illinois courts website at illinoiscourts.gov.

What are the filing requirements for each probate petition?

Petition for Probate of Will and Letters Testamentary

This petition must include:

The original will (not a copy)
A certified copy of the death certificate
Names, addresses, and relationships of all interested parties (heirs, legatees, devisees)
A reasonable estimate of the estate's value and the nature of its assets
The petitioner's acceptance of the office of executor
An oath of office, typically signed in front of a notary
A proposed order for the judge to sign

If the will wasn't self-proving (meaning it doesn't include the proper attestation clause with witness affidavits), you'll also need testimony from one of the witnesses who signed the will.

Petition for Letters of Administration

When no will exists, this petition asks the court to appoint an administrator. Requirements include:

A certified copy of the death certificate
Names, addresses, and relationships of all heirs under Illinois intestate succession law
An estimate of the estate's assets and debts
A renunciation or waiver from any heirs with higher priority to serve (Illinois law sets a priority order for administrators, starting with the surviving spouse)
The petitioner's acceptance and oath of office
A proposed order

For a deeper look at the forms needed for estate administration beyond the initial petition, our guide to Illinois estate administration forms covers what executors and administrators need throughout the entire process.

How do you actually fill out a Cook County probate petition?

The petition forms themselves are structured to walk you through the information the court needs. Here's how to approach each section:

Caption and case number. If this is a new filing, leave the case number blank the clerk will assign one. Fill in the division (Probate), the county (Cook), and the court address.
Decedent information. Full legal name, date of death, last known address, and county of residence at the time of death.
Petitioner information. Your full legal name, address, and relationship to the decedent.
Will information. If applicable, state the date the will was signed and name the witnesses. Attach the original will.
Heir and beneficiary information. List every person who has a legal interest in the estate. Include names, addresses, relationships, and ages of any minors. Missing an heir is one of the most common filing errors learn more about common mistakes when filing estate administration petitions.
Asset information. Provide a good-faith estimate of the estate's total value. You don't need exact figures at this stage, but the court uses this to determine bond requirements and the scope of administration.
Relief requested. This section tells the court what you're asking for admission of the will to probate, your appointment as executor or administrator, issuance of letters, and any other specific authority you need.
Signature, verification, and notarization. The petition must be signed under oath. Most petitions include a verification clause that requires notarization.

If you'd like a step-by-step walkthrough of the form completion process, see our detailed instructions for completing Illinois probate court petition forms.

What are the filing fees for probate petitions in Cook County?

As of the most recent fee schedule, filing a probate petition in Cook County generally costs around $300 to $400, though the exact amount can vary depending on the type of proceeding and whether additional motions or petitions are filed. The clerk's office accepts payment by cash, check, or money order. Credit card payments may also be accepted for e-filed cases. Fee waivers are available for individuals who qualify based on income ask the clerk's office for the required affidavit of indigency.

Do you need a surety bond?

The court may require the executor or administrator to post a surety bond to protect the estate from mismanagement. Bond requirements depend on several factors:

The estimated value of the personal property in the estate
Whether the will waives the bond requirement
Whether all interested parties consent to waiving the bond
The petitioner's creditworthiness and residency

If a bond is required, you'll need to obtain it from a licensed surety company before letters testamentary or letters of administration are issued. The bond premium is paid from the estate's assets.

What happens after you file the petition?

Once the petition and supporting documents are filed and the filing fee is paid, the clerk schedules a court date. Before that hearing, you're generally required to:

Send notice to all interested parties. Illinois law requires written notice of the petition and hearing date to be mailed to all heirs, beneficiaries, and any other interested parties at least 14 days before the hearing (for supervised administration) or as otherwise required.
Publish notice (in some cases). If the estate involves unknown heirs or if required by the court, a notice may need to be published in a local newspaper.

At the hearing, the judge reviews the petition, the will (if applicable), and any objections. If everything is in order, the judge signs an order admitting the will to probate and appointing the executor or administrator. The clerk then issues Letters Testamentary or Letters of Administration the official documents that give the appointed person legal authority to act on behalf of the estate.

What are common mistakes that delay Cook County probate filings?

Probate filings in Cook County get sent back or delayed for predictable reasons. Here's what to watch out for:

Filing copies instead of the original will. The court requires the original document. If the original is lost, you'll need additional steps to prove its contents.
Incomplete heir information. Leaving out even one known heir can result in a rejected petition or future legal challenges.
Missing notarization. The petition verification must be notarized. An unsigned or unnotarized verification is the same as not filing.
Incorrect fee payment. Check the current fee schedule before filing. Underpayment delays processing.
Failing to attach the death certificate. A certified copy (not a photocopy) is required.
Using outdated forms. Court forms get updated periodically. Always download the latest version from the Cook County Clerk of the Circuit Court or confirm with the probate division that your form is current.

For a more detailed look at what goes wrong during the filing process, our article on common mistakes when filing estate administration petitions in Illinois covers the errors that cause the most problems.

Can you file a probate petition without a lawyer?

Yes, Illinois law allows individuals to represent themselves in probate proceedings. Cook County does not require you to hire an attorney to file a probate petition. That said, probate involves legal deadlines, notice requirements, fiduciary duties, and potential disputes among heirs. Simple estates with a clear will and cooperative beneficiaries are the most manageable for self-represented filers. Estates involving contested wills, business interests, real estate in multiple states, or disputes among family members are significantly harder to handle without legal help.

The Cook County Probate Court Self-Help Center can provide general guidance on forms and procedures, though they cannot give legal advice. The Cook County Circuit Court website also offers downloadable forms and basic filing information.

What if the estate is small do you still need to file a petition?

Not always. Illinois allows the use of a Small Estate Affidavit for estates that meet specific criteria. If the estate consists only of personal property (no real estate) and the total value falls within the statutory threshold, heirs can collect assets directly from banks and other institutions by presenting a properly completed affidavit no court petition required.

However, the small estate affidavit has limits. It doesn't work for real estate, it doesn't give anyone court-appointed authority, and financial institutions sometimes reject affidavits they consider incomplete or questionable. If your situation involves real property, significant debts, or potential disputes, a full probate petition is likely the better path. Our comparison of small estate affidavits and full probate petitions walks through the decision in more detail.

Quick checklist before filing your Cook County probate petition

☑ Determine the correct petition type (testate, intestate, or administration with will annexed)
☑ Obtain a certified copy of the death certificate
☑ Locate the original will, if one exists
☑ Gather names, addresses, and relationships of all heirs and beneficiaries
☑ Estimate the estate's total value (assets and debts)
☑ Download the most current petition form from the Cook County Clerk or probate division
☑ Complete the petition fully don't leave blanks
☑ Notarize the petition verification before signing
☑ Check the current filing fee and prepare the correct payment
☑ Determine if a surety bond is required
☑ Prepare notice documents to send to all interested parties after filing
☑ File the original petition and all attachments with the Probate Division clerk
☑ Note your court date and set calendar reminders for all deadlines

Getting the petition right the first time saves weeks of delay. If you're looking for a complete resource on Cook County probate forms, our full overview of Cook County probate petition forms requirements is a helpful starting point for every step of the process.