Same-Sex and LGBTQ Divorce in Illinois: How Your Marriage Date Shapes Property and Maintenance

You and your spouse have been together since 2004. You entered a civil union in 2011, the first year Illinois offered one. You held a wedding in 2016. Now the marriage is ending, and one of the first questions worth answering is which of those years an Illinois court will treat as the start of your marriage.

The answer is not obvious. It is also not a technicality. That single date sets the outer boundary of the marital estate and drives how long maintenance can last.

The Two Dates That Decide Your Case

Same-sex couples in Illinois divorce under the same Illinois Marriage and Dissolution of Marriage Act as everyone else. The process is identical. The petition looks the same, the financial disclosure requirements are the same, and the judge applies the same statutes.

What differs is the factual record underneath, and it usually comes down to timing.

Illinois passed the Religious Freedom Protection and Civil Union Act, and civil unions became available on June 1, 2011. Marriage followed three years later, on June 1, 2014, under the Religious Freedom and Marriage Fairness Act. The federal cases arrived on either side of that: United States v. Windsor in 2013 and Obergefell v. Hodges in 2015.

The Conversion Window Most Couples Missed

Two Routes, Two Different Marriage Dates

When marriage opened up in 2014, couples already in civil unions had two ways to convert, and the choice between them is still shaping cases today.

Under 750 ILCS 75/65(a), partners in a civil union can apply for a marriage license, hold a ceremony, and register the marriage. This route is still available. The marriage dates from the new ceremony.

Under subsection (b), for one year following the statute’s effective date, partners could skip the ceremony and have the civil union itself legally designated and recorded as a marriage. That marriage was deemed effective on the date the civil union was solemnized, not on the date of the paperwork. The fee was waived. The only conditions were that the civil union had not been dissolved and no dissolution proceeding was pending.

That second option expired in 2015. It has not returned.

Redesignation During the Window Closed since 2015. The marriage was backdated to the day of the civil union, which for early adopters means 2011.

What This Looks Like in a DuPage Courtroom

Two couples enter civil unions the same week in 2011. One of them walks into the county clerk’s office in late 2014, signs a marriage certificate, and has the union redesignated. The other plans a wedding and marries in 2016.

Both couples file for divorce in 2026. On paper, one has been married for fifteen years and the other for ten. They have been together the same length of time.

What the Marriage Date Changes

Marital Property and the Boundary of the Estate

Illinois is an equitable distribution state. Under 750 ILCS 5/503, the court divides marital property in proportions it considers just, which is not the same as equal. Property either spouse acquired before the marriage is generally non-marital and stays with that spouse.

For couples who spent a decade or more building a life before the state would recognize it, that boundary can fall in an awkward place. A condo bought in 2007, a retirement account funded since 2005, a business started in 2009: all of it may sit outside the marital estate if the legal marriage began in 2016.

This is not the end of the analysis. Non-marital property can become partly marital through commingling, and a spouse who contributed to the other’s non-marital property or to its increase in value can seek reimbursement. Those claims take documentation, and the further back the contributions go, the harder they are to prove. Pulling records early matters, which is one reason preparing financially before filing is worth the effort.

Maintenance Duration and the Length of Your Marriage

Illinois calls it maintenance. Most people call it alimony. Under 750 ILCS 5/504, when the parties’ combined gross annual income is under the statutory threshold and neither has support obligations from a prior relationship, the guideline formula sets both the amount and the length.

Duration is the part that turns on your marriage date. The court multiplies the length of the marriage by a factor that increases with each year of marriage. A ten-year marriage uses .44. A fifteen-year marriage uses .64. Marriages of twenty years or more can produce maintenance for a period equal to the marriage or for an indefinite term.

Run the two couples through it. Ten years multiplied by .44 gives a guideline term of 4.4 years. Fifteen years multiplied by .64 gives 9.6 years. The relationships were the same length. The guideline terms differ by more than five years.

Courts can depart from the guidelines, and they must explain in writing what the guideline figures would have been and why the award varies. But the guideline is where the conversation starts, and the marriage date is where the guideline starts. The factors that shape a maintenance award go to whether maintenance is appropriate at all, and you can run rough numbers with the alimony calculator.

Gay and Lesbian Couples With Children Born Before the Marriage

Under 750 ILCS 46/204, a person is presumed to be a parent of a child born to their spouse during a marriage, and the same presumption applies to a civil union. That reaches couples back to 2011.

Children born before that date fall outside the presumption. So do children born to couples who never entered a civil union and married later. In those cases, the parent who did not give birth may have raised the child from infancy and still have no automatic legal standing.

There are routes to fix it. Where the child was conceived through assisted reproduction, 750 ILCS 46/703 recognizes a person who consented to the procedure intending to be a parent. Where the presumption does not apply and no acknowledgment exists, adoption remains available.

The Equality for Every Family Act rebuilt much of this. It created a streamlined confirmatory adoption for children born through assisted reproduction, which no longer requires terminating the other parent’s rights first. It also opened acknowledgment of parentage beyond paternity, so a person in a same-sex relationship can acknowledge parentage the way a father always could. The acknowledgment changes took effect January 1, 2026.

There is a deadline worth knowing. Under 750 ILCS 46/608, an action challenging a presumption of parentage generally must be brought within two years of when the person knew or should have known the relevant facts. That limit does not apply to an action brought by the child.

Establishing Parentage When the Presumption Does Not Apply

1. Confirm the child’s date of birth against the date of the marriage or civil union.
2. Determine whether the child was conceived through assisted reproduction and whether both partners consented.
3. Gather the birth certificate, any donor or clinic agreements, and any prior court orders.
4. Identify the right path: acknowledgment, a parentage action, or confirmatory adoption.
5. File before the two-year limit runs if a presumption is being contested.

If parentage was never formally established, establishing parentage is usually the first step, and it often has to happen before the support and parenting questions can move at all.

Child Support When Parentage Was Established Differently

Illinois calculates child support under the income shares model, which combines both parents’ net incomes and allocates the resulting obligation according to income share and the number of overnights.

The obligation follows legal parentage, not biology. A legal parent who did not give birth to the child and shares no genetic connection can be ordered to pay support, and can also receive it. That surprises people on both sides. A birth parent sometimes assumes the other parent has no obligation, and a non-biological parent sometimes assumes they have no claim. Neither is right once parentage is established.

The practical consequence is that the parentage question comes first and the money question follows. You can estimate figures with the child support calculator once you know who the legal parents are, and the mechanics of child support in Illinois apply the same way they do in any other case.

Decision-Making and Parenting Time

Illinois stopped using the words custody and visitation in 2016.

Courts now allocate significant decision-making responsibilities under 750 ILCS 5/602.5, covering education, health, religion, and extracurricular activities. Parenting time is allocated separately under 750 ILCS 5/602.7. Both run on the best interests of the child, and both are set out in a written parenting plan that the parties propose and the court approves.

Ending a Civil Union That Was Never Converted

Civil unions still exist in Illinois. They remain available to couples of any sex, and plenty of couples chose to stay in one rather than marry.

Dissolving a civil union runs through the same Illinois Marriage and Dissolution of Marriage Act that governs divorce. The court resolves property, maintenance, decision-making, parenting time, and support the same way. What differs is the caption on the petition.

Conversion runs one direction only. A civil union can become a marriage. A marriage cannot become a civil union.

One spouse must have lived in Illinois for 90 days before a judgment can enter. Cases from DuPage County are typically heard in the 18th Judicial Circuit in Wheaton, and Cook County cases are typically heard at the Daley Center or a suburban district courthouse.

Grounds and Timeline in Illinois

There is one ground for divorce in Illinois, and it is irreconcilable differences under 750 ILCS 5/401.

Adultery, cruelty, and abandonment stopped being grounds for divorce in Illinois on January 1, 2016. Illinois also has no covenant marriage. Pages that still list fault grounds are describing law that no longer applies here.

Living separate and apart for six months creates an irrebuttable presumption that the requirement is met. Spouses can waive that period by written stipulation, and many do. Separate and apart does not always mean separate addresses, which matters when one spouse cannot afford to move out yet.

Frequently Asked Questions