Same-Sex Divorce in Illinois: Complete 2026 Legal Guide

By Antonio G. Jimenez, Esq. | Florida Bar No. 21022 | Covering Illinois divorce law

Same-sex divorce in Illinois follows the same legal framework as opposite-sex divorce under the Illinois Marriage and Dissolution of Marriage Act (IMDMA), 750 ILCS 5/. Since the Illinois Religious Freedom Protection and Civil Union Act took effect June 1, 2011, and full marriage equality arrived November 20, 2013 under Public Act 98-597, LGBTQ couples have identical rights and obligations in dissolution proceedings. Filing fees range from $289 to $388 as of April 2026, depending on county. Illinois requires 90 days of residency before filing and recognizes only irreconcilable differences as grounds under 750 ILCS 5/401.

Key Facts: Same-Sex Divorce in Illinois (2026)

As of April 2026. Verify with your local circuit clerk.

Is Same-Sex Divorce Different in Illinois?

Same-sex divorce in Illinois is legally identical to opposite-sex divorce under 750 ILCS 5/401, with one critical complication: the "marriage gap" for couples together before November 20, 2013. Illinois courts can only divide marital property acquired during the legal marriage, which creates unique valuation issues for LGBTQ couples who cohabited or held civil unions for years before marriage equality. The standard filing fee is $289-$388, and all IMDMA provisions apply equally regardless of spouse gender.

The Illinois Marriage and Dissolution of Marriage Act was amended by Public Act 98-597 (the Religious Freedom and Marriage Fairness Act), effective June 1, 2014, which made all marriage laws gender-neutral. This means same gender divorce proceedings use identical forms, identical courtrooms, and identical judges as any other dissolution. Illinois abolished fault-based grounds effective January 1, 2016 under Public Act 99-90, leaving irreconcilable differences as the sole basis for dissolution under 750 ILCS 5/401(a).

The practical distinction lies in timing. A couple married in Massachusetts in 2004, who relocated to Illinois and divorced in 2026, has 22 years of relationship history but potentially fewer marital years for property division purposes. Courts applying 750 ILCS 5/503 must determine when "marital property" accrual began, a question that has generated significant LGBTQ divorce litigation since 2015.

Residency Requirements for Same-Sex Divorce in Illinois

Illinois requires at least one spouse to maintain residency in the state for 90 days before a judgment of dissolution can be entered under 750 ILCS 5/401(a). You can file the petition immediately upon moving to Illinois, but the court cannot finalize the divorce until the 90-day residency threshold is met. Military personnel stationed in Illinois for 90 days satisfy this requirement even if their legal domicile is elsewhere.

The 90-day rule applies uniformly to gay divorce and straight divorce alike. Unlike states such as Nevada (6 weeks) or Texas (6 months plus 90 days in county), Illinois sits in the middle for residency speed. The residency period runs continuously, meaning a spouse who moves away and returns must restart the clock. For LGBTQ couples who married in destination wedding states but now live in Illinois, only Illinois residency matters, not where the marriage occurred.

Venue rules under 735 ILCS 5/2-101 require filing in the county where either spouse resides. Cook County handles the highest volume of same-sex divorce cases, processing roughly 28,000 dissolution filings annually across its six domestic relations courtrooms at the Richard J. Daley Center, 50 W. Washington Street, Chicago. Filing in the wrong county triggers a transfer motion but does not defeat jurisdiction.

Filing Fees and Court Costs in 2026

The initial filing fee for divorce in Illinois ranges from $289 in smaller counties to $388 in Cook County as of April 2026, with a typical total cost of $334 when including mandatory surcharges. Respondents pay an appearance fee of $191-$251. Fee waivers are available under Illinois Supreme Court Rule 298 for petitioners whose household income falls below 125% of the federal poverty line, which equals $19,562 for a single person in 2026.

Cook County charges $388 for the petitioner and $251 for the respondent as of April 2026. DuPage County filing fees run $324 and $194 respectively. Will County assesses $339 and $214. Lake County fees are $334 and $224. Smaller counties like Jo Daviess charge $289 and $191. These amounts include the base fee, automation surcharge, document storage fee, mandatory arbitration fee (in counties with court-annexed arbitration), and children's advocacy center fee.

Beyond filing fees, expect additional costs: $50-$75 for service of process by the sheriff, $10-$30 for certified copies of the judgment, $200-$500 for a parenting class (mandatory when minor children are involved under 750 ILCS 5/404.1), and $150-$500 for a Guardian ad Litem retainer when custody is contested. Full contested LGBTQ divorce in Illinois averages $15,000-$35,000 per spouse in attorney fees, while uncontested matters average $1,500-$4,500.

As of April 2026. Verify with your local circuit clerk.

Grounds for Dissolution: Irreconcilable Differences Only

Illinois recognizes only irreconcilable differences as grounds for dissolution of marriage under 750 ILCS 5/401(a), having eliminated all fault-based grounds effective January 1, 2016 through Public Act 99-90. The petitioner must allege that irreconcilable differences have caused the irretrievable breakdown of the marriage and that past efforts at reconciliation have failed. No spouse needs to prove wrongdoing, and adultery, cruelty, or desertion play no formal role in the dissolution itself.

Before the 2016 reforms, Illinois required a 2-year separation period or mutual agreement to waive it. The current statute creates a rebuttable presumption of irreconcilable differences if spouses have lived separate and apart for a continuous period of 6 months before the judgment. Critically, this 6-month period can be waived by stipulation, meaning agreed divorces can move much faster. For same gender divorce in Illinois, this no-fault framework eliminates the historical legal problems LGBTQ petitioners faced in fault jurisdictions where sexual orientation itself was sometimes cited as grounds.

Because grounds are no-fault, marital misconduct generally cannot be considered when dividing property under 750 ILCS 5/503(d). The exception is "dissipation" claims, where one spouse spent marital assets for purposes unrelated to the marriage after the breakdown began. Dissipation claims must be filed within specific timeframes: at least 60 days before trial or within 30 days after discovery closes, per 750 ILCS 5/503(d)(2).

Property Division Under Equitable Distribution

Illinois applies equitable distribution, not community property, meaning marital assets are divided fairly but not necessarily 50/50 under 750 ILCS 5/503. Courts weigh 12 statutory factors including each spouse's contribution to acquisition, economic circumstances, duration of the marriage, custodial provisions for children, and the desirability of awarding the family home to the custodial parent. Non-marital property, defined in 750 ILCS 5/503(a), remains with its original owner.

For same-sex divorce cases, the critical question is when marital property accrual began. Illinois courts have grappled with this since 2015 in cases involving couples who held civil unions before marriage equality. The Illinois Religious Freedom Protection and Civil Union Act (750 ILCS 75/) granted civil union partners the same rights as spouses effective June 1, 2011, and Public Act 98-597 automatically converted civil unions to marriages upon application. This means civil union dates can serve as the start of marital property accrual in many LGBTQ divorce scenarios.

Common Illinois asset categories and their treatment:

Debt is divided under the same equitable principles. Credit card balances, mortgages, car loans, and student loans incurred during marriage are typically marital obligations subject to division under 750 ILCS 5/503(d).

Spousal Maintenance (Alimony) Calculations

Illinois uses a statutory formula for spousal maintenance under 750 ILCS 5/504(b-1) for couples with combined gross annual income under $500,000. The maintenance amount equals 33.3% of the payor's net income minus 25% of the payee's net income, but the result cannot cause the recipient to receive more than 40% of the couples' combined net income. The duration is calculated by multiplying the length of marriage by a statutory factor ranging from 0.20 to 1.00.

Duration factors under 750 ILCS 5/504(b-1)(1)(B) work as follows: marriages under 5 years use a 0.20 multiplier, 5-10 years use 0.40-0.60, 10-15 years use 0.60-0.80, 15-20 years use 0.80-1.00, and marriages of 20+ years permit permanent maintenance or maintenance equal to the marriage length. For a 12-year same-sex marriage, maintenance would run roughly 7.2 years (12 × 0.60). Courts retain discretion to deviate when formula results would be inappropriate.

For LGBTQ divorce cases involving pre-2013 relationships, the marriage length question is pivotal. Some Illinois trial courts have considered civil union duration when calculating maintenance length, while others strictly apply the formal marriage date. The Illinois Supreme Court has not definitively resolved this issue as of April 2026, making venue selection and judicial assignment meaningful considerations in same gender divorce planning.

Child Custody: Allocation of Parental Responsibilities

Illinois replaced the terms "custody" and "visitation" with "allocation of parental responsibilities" and "parenting time" effective January 1, 2016 under Public Act 99-90. Courts allocate significant decision-making responsibilities in four categories under 750 ILCS 5/602.5: education, health, religion, and extracurricular activities. Parenting time is allocated based on the best interests of the child using 17 statutory factors under 750 ILCS 5/602.7.

For same-sex couples, the Illinois Parentage Act of 2015, 750 ILCS 46/, establishes legal parentage for both spouses regardless of genetic connection. A child born to a married same-sex couple is presumed to be the child of both spouses under 750 ILCS 46/204(a)(1), analogous to the traditional marital presumption. This presumption can still be rebutted, and many LGBTQ family law attorneys recommend completing a second-parent or confirmatory adoption to secure parentage rights that travel across state lines and withstand federal challenges.

Illinois uses an income shares model for child support under 750 ILCS 5/505, adopted in 2017 via Public Act 99-764. The court calculates combined net income of both parents, applies a statewide income shares schedule, and apportions the basic support obligation based on each parent's percentage of combined income. Shared parenting arrangements where each parent has the child at least 146 overnights per year trigger a different calculation that accounts for duplicated expenses.

The Marriage Gap Problem for LGBTQ Couples

The single most complex issue in same-sex divorce Illinois cases is the "marriage gap" affecting couples together before November 20, 2013. A couple in a 22-year relationship may have been legally married only 12 years, creating significant disputes over property accrual, pension division, and maintenance duration. Illinois courts handle this through three mechanisms: civil union recognition dating to June 1, 2011; out-of-state marriage recognition under the Full Faith and Credit Clause; and equitable exceptions under 750 ILCS 5/503.

Couples who converted civil unions to marriage under Public Act 98-597 can point to the civil union date as the start of their legal union for property purposes. The Illinois Appellate Court addressed related issues in Gehrt v. Gehrt and subsequent cases, holding that civil union periods generally count toward marital accrual when the couple later married. For couples who never entered a civil union but lived as committed partners, Illinois does not recognize common-law marriage, leaving only equitable claims based on express contracts, implied partnerships, or constructive trust theories.

Out-of-state marriages pose different issues. A couple married in Canada in 2003 and relocated to Illinois in 2010 can rely on Illinois recognition dating to June 1, 2014 under PA 98-597, which recognized out-of-state same-sex marriages retroactively. The couple's 2003 Canadian marriage date generally controls marital property accrual, though Illinois has historically limited recognition to the effective date of the underlying recognition statute. This nuanced area requires experienced LGBTQ divorce counsel.

Timeline for Same-Sex Divorce in Illinois

Uncontested same-sex divorce in Illinois typically completes in 60-120 days from filing, while fully contested cases involving property and custody disputes average 12-18 months under current Cook County case flow standards. The minimum statutory timeline requires 90 days of residency and, if unwaived, a 6-month separation period under 750 ILCS 5/401(a-5). Agreed divorces typically waive the 6-month separation requirement.

Typical procedural milestones:

Cook County's case management standards under General Administrative Order 2019-03 target 18 months for disposition of contested dissolution cases. Collar county courts (DuPage, Kane, Lake, McHenry, Will) generally move faster than Cook County due to lower caseloads, averaging 10-14 months for contested matters.

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