The Complete Illinois Divorce Checklist: Your Step-by-Step Preparation Guide (2025)

Summary

Case Summary: In re Marriage of Vician - This article provides a comprehensive 2025 checklist for navigating divorce in Illinois, covering preparation timelines, required court documents, financial calculators, legal aid options, and cybersecurity measures. A key legal point highlighted is that Illinois uses statutory formulas under 750 ILCS 5/505 for child support (income shares model) and 750 ILCS 5/504 for maintenance calculations, with specific factors like parenting time thresholds (146 overnights) triggering adjustments to support obligations.

Navigate your Illinois divorce with confidence. This comprehensive checklist covers vetted tools, forms, calculators, and support services. Everything you need is in one place.

Why This Checklist Exists: "In 15 years practicing family law in Cook County, I've seen unprepared clients lose winnable cases. A missing document can delay your case by months. A forgotten password can lock you out of critical accounts. This checklist ensures you don't make those mistakes."

Whether you're facing a contested custody battle in Cook County or dividing retirement accounts after a 20-year marriage, having the right resources matters. The difference between a favorable outcome and a costly mistake often comes down to preparation.

30 Days Before Filing: Critical Preparation

• ☐ Gather financial records: Collect your last 3 years of tax returns, bank statements, and investment account statements
• ☐ Document digital assets: List all cryptocurrency wallets, PayPal accounts, and Venmo balances with current values
• ☐ Secure sensitive communications: Create a new encrypted email account (ProtonMail) for all attorney correspondence
• ☐ Change passwords immediately: Update credentials for bank accounts, email, and social media using a password manager
• ☐ Screenshot evidence now: Capture text messages, emails, and social media posts while preserving metadata
• ☐ Open individual accounts: Establish checking and savings accounts in your name only at a different bank

Official Government Resources for Illinois Divorce

Illinois Courts and Legal Authority

Start with authoritative legal information. These official sources provide the statutory framework governing every Illinois dissolution case.

• Illinois General Assembly: ilga.gov - Access the full text of 750 ILCS 5 (Illinois Marriage and Dissolution of Marriage Act). This includes child support guidelines, maintenance formulas, and property division standards.
• Illinois Supreme Court: illinoiscourts.gov - Find Supreme Court Rules, administrative orders, and statewide procedural requirements.
• Cook County Circuit Court: cookcountycourt.org - Access county-specific forms, the mandatory e-filing portal, and Domestic Relations Division procedures.
• Illinois Legal Aid Online: illinoislegalaid.org - Download free standardized divorce forms and use interactive document assembly tools written in plain English.

State Agencies Supporting Divorce Proceedings

These agencies handle critical aspects of cases involving children, support enforcement, and protective services.

• Illinois Department of Healthcare and Family Services: Handles child support enforcement, wage garnishment processing, and interstate support collection. Essential when your ex-spouse relocates or misses payments.
• Illinois DCFS (Department of Children and Family Services): Manages child welfare investigations and the abuse reporting hotline. Contact them when custody disputes involve safety concerns.

At Filing: Required Documents Checklist

Using incorrect forms can delay your case by weeks or months. These official sources ensure your filings meet Illinois requirements.

• ☐ Petition for Dissolution of Marriage: Illinois Supreme Court standardized form—accepted in every county
• ☐ Summons: Official court summons form for service on your spouse
• ☐ Financial Affidavit: Sworn and notarized statement of income, expenses, assets, and debts
• ☐ Filing fee payment: $337+ in most counties (fee waiver available if income below 200% of poverty guidelines)
• ☐ Case Information Statement: County-specific supplemental form required in Cook, DuPage, and other counties

Real-World Filing Example

Scenario: Sarah, a Naperville resident, discovered her husband's hidden bank accounts. She needed these specific forms:

1. Petition for Dissolution of Marriage (Supreme Court form)
2. DuPage County Case Information Statement
3. Financial Affidavit with attached bank statements
4. Emergency Motion for Asset Preservation
5. Fee waiver application (denied due to income, but worth attempting)

Result: Having the correct forms prepared before her courthouse visit saved Sarah three separate trips. She avoided approximately six weeks of delays.

Calculators and Financial Tools

Support Calculation Resources

Illinois uses statutory formulas for both child support and maintenance. These calculators help you estimate obligations before negotiating settlements.

• Illinois Child Support Calculator: Estimate obligations under the income shares model (750 ILCS 5/505). The formula accounts for both parents' incomes, number of children, and parenting time allocation.
• Illinois Maintenance Calculator: Calculate spousal support duration and amount under 750 ILCS 5/504. The formula multiplies combined income by specific percentages based on marriage length.
• Parenting Time Calculator: Determine overnight percentage for each parent. Crossing the 146-overnight threshold triggers shared parenting adjustments to child support.
• Court Cost Estimator: Budget for filing fees ($337 in most counties), service of process ($50-150), QDRO preparation ($1,500-4,500), and GAL fees if appointed.

Financial Planning Scenario

Example Calculation: Marcus and Jennifer divorced after 15 years of marriage with two children. They used these tools to project:

• Child support: $1,847/month based on combined $180,000 income
• Maintenance: $2,100/month for 7.5 years (50% of marriage length)
• Total monthly obligation: $3,947

Outcome: Armed with these calculations, Marcus negotiated a property division that offset some support obligations. He saved approximately $47,000 over the support period.

Discovery Phase: Evidence Collection Checklist

• ☐ Respond to interrogatories: You have 28 days under Illinois Supreme Court Rule 213—mark your calendar
• ☐ Produce requested documents: Use secure file transfer services, never unencrypted email
• ☐ Prepare for deposition: Schedule a meeting with your attorney at least 48 hours before
• ☐ Organize financial discovery: Create folders for bank statements, tax returns, and pay stubs by year
• ☐ Track all deadlines: Missing a discovery deadline can result in sanctions or evidence exclusion

Legal Aid and Low-Cost Representation Options

Income-Qualified Free Legal Services

If your household income falls below 125-200% of federal poverty guidelines, you may qualify for free attorney representation.

• Legal Aid Chicago: Provides free representation for low-income Cook County residents. Priority goes to domestic violence survivors in divorce, custody, and protective order cases.
• Prairie State Legal Services: Serves DuPage, Kane, Lake, McHenry, and other collar counties. Offers free divorce representation and advice-only clinics.
• Land of Lincoln Legal Aid: Covers 65 counties in Central and Southern Illinois. This is the largest geographic legal aid provider in the state.

Limited Scope (Unbundled) Legal Services

Can't afford full representation? These options provide professional help for specific tasks at reduced cost.

• Chicago Bar Association Lawyer Referral Service: Offers $50 initial consultations with screened family law attorneys. Includes reduced-rate representation referrals.
• Illinois State Bar Association Modest Means Program: Connects moderate-income clients with attorneys offering $150-200/hour versus standard $350-500 rates.

Pro Se (Self-Help) Resources

Representing yourself? These resources provide guidance without replacing attorney advice.

• Court Self-Help Centers: Get free in-person assistance at the Daley Center (Room 1001) and most county courthouses. Staff help with form completion but cannot provide legal advice.
• Illinois Legal Aid Online A2J Author: Use interactive document assembly that asks plain-English questions. It generates completed court forms—like TurboTax for divorce paperwork.

Cybersecurity Safeguards During Your Case

Your digital communications may become evidence. Protect sensitive attorney-client discussions with these tools.

• ☐ Enable two-factor authentication: Use Authy on all email, banking, and social media accounts
• ☐ Monitor credit reports: Identity theft spikes during divorces—check all three bureaus monthly
• ☐ Use VPN on public Wi-Fi: Mullvad masks your location when accessing case documents from shared networks
• ☐ Never discuss case on social media: Every post is discoverable evidence that can be used against you
• ☐ Install encrypted messaging: Signal offers military-grade encryption for attorney communications
• ☐ Preserve digital evidence properly: Use X1 Social Discovery to capture posts with legally defensible metadata

Cybersecurity Implementation Scenario

Real-World Application: David suspected his wife was hiding cryptocurrency assets. His attorney recommended this security protocol:

1. Created new ProtonMail account for all case-related communications
2. Installed Signal for attorney phone consultations
3. Changed all passwords using Bitwarden-generated credentials
4. Enabled two-factor authentication on banking and email
5. Used X1 Social Discovery to preserve his wife's Instagram posts showing luxury purchases

Outcome: The preserved social media evidence contradicted his wife's financial affidavit. The posts showed luxury purchases inconsistent with her claimed income. This led to sanctions and a more favorable property division.

Support and Counseling Resources

Emotional Support Services

Full Opinion (PDF): Download the full opinion

Written by Jonathan D. Steele

Chicago divorce attorney with cybersecurity certifications (Security+, CEH, ISC2). Illinois Super Lawyers Rising Star 2016-2025.

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For more insights, read our Divorce Decoded blog.