Legal separation forms in Illinois allow married couples to live apart while remaining legally married, addressing issues like child custody, support, and property division without divorcing. As a legal writer with over a decade of experience drafting family-law templates for attorneys and self-represented litigants across the United States, I’ve helped hundreds of Illinois residents navigate the legal separation process cost-effectively. In this comprehensive guide, I’ll provide everything you need in 2025—including a free, attorney-reviewed legal separation forms Illinois template you can download instantly—plus filing instructions, current court fees, and answers to the questions I hear most often from clients.
At the end of this article, you’ll find a completely free downloadable Petition for Legal Separation that meets current Illinois requirements under 750 ILCS 5/ (the Illinois Marriage and Dissolution of Marriage Act).
In Illinois, legal separation (officially called “Separate Maintenance”) is a court-ordered arrangement that lets spouses live separately while staying married. Unlike divorce, the marriage is not dissolved, so neither party can remarry. Common reasons Illinois couples choose legal separation include:
The court can still decide child custody, parenting time, child support, spousal maintenance, and division of marital property—exactly the same issues addressed in a divorce.
The cost of legal separation in Illinois varies widely depending on whether you hire attorneys and how contested the case becomes. Here’s the 2025 breakdown I give clients:
| Expense | Average Cost (2025) |
|---|---|
| Circuit court filing fee (Cook County) | $388–$418 (varies by children/no children) |
| Filing fee in other counties | $250–$350 |
| Summons/service of process | $50–$300 (sheriff or private process server) |
| Parenting class (if minor children) | $40–$80 per parent (mandatory in most counties) |
| Attorney fees (uncontested) | $1,500–$4,000 total |
| Attorney fees (contested) | $10,000–$50,000+ |
| DIY with free forms (this guide) | $300–$800 total |
Using the free legal separation forms in Illinois provided below can save you thousands if your case is uncontested and you and your spouse agree on all terms.
After reviewing hundreds of court-approved forms and the latest statutory changes, I’ve created a free, fillable PDF package that contains the most commonly needed documents for an uncontested legal separation in Illinois:
Click here to download your free Illinois legal separation forms package (instant PDF)
These forms are based directly on the standardized Illinois court forms available at illinoiscourts.gov and comply with 750 ILCS 5/ as of November 2025.
| Issue | Legal Separation | Dissolution of Marriage (Divorce) |
|---|---|---|
| Marriage ends? | No – still legally married | Yes – marriage dissolved |
| Can remarry? | No | Yes |
| Health insurance continuation | Usually stays intact | Often terminates |
| Waiting period | None (if grounds proven) | None since 2016 (no-fault) |
| Grounds required? | Yes (unless both consent) | No (irreconcilable differences only) |
Illinois still requires grounds for legal separation unless both parties consent. Common grounds include:
Source: 750 ILCS 5/401(a)
No. Illinois allows pro se (self-represented) filings, and judges routinely approve well-drafted agreements from unrepresented parties.
Uncontested cases: 2–8 weeks from filing to judgment. Contested cases: 6–24+ months.
Yes. Either party can file a petition to convert after two years, or immediately if both agree (750 ILCS 5/412).
No. Illinois uses the same Income Shares model for both separation and divorce (Illinois HFS Income Shares).
Over my 10+ years drafting templates and assisting Illinois families, I’ve seen legal separation be the perfect solution for couples who aren’t ready—or religiously able—to divorce but still need court protection for finances and children. Using proper, up-to-date legal separation forms in Illinois can keep your total cost under $800 in an uncontested case, versus $15,000+ with lawyers fighting every issue.
Download the free package above, fill it out honestly and completely, and you’ll be well on your way.
Important Disclaimer: This article and the downloadable forms are for informational purposes only and do not constitute legal advice. Laws change frequently, and your situation may have unique factors. Always consult a licensed Illinois family law attorney or your local circuit clerk before filing. Neither the author nor this website is responsible for any outcome resulting from use of these materials.
Ready to start? Download your free 2025 Illinois legal separation forms package now: