Do Unmarried Couples Have Legal Rights in Illinois?

 Posted on July 08, 2026 in Family Law

Unmarried couples in Illinois do not have the same legal protections as married couples. There is no automatic right to divide property or receive spousal maintenance when a relationship ends. This is true no matter how many years a couple has lived together or how combined their finances have become. The one significant exception involves children, since child custody and child support obligations apply to unmarried parents just as they do to married ones. 

In 2026, Illinois law still does not fill this gap on its own, but a Chicago, IL family law attorney can help unmarried couples protect their interests.

Does Illinois Recognize Common Law Marriage?

Illinois abolished common law marriage in 1905. An unmarried relationship is not treated as a marriage under Illinois law, no matter how many years the couple lives together, how thoroughly they combine their finances, or whether they introduce each other as spouses. Without a marriage license, the law treats two long-term partners as two single individuals. 

A handful of states still recognize common law marriage without a license or ceremony. Under 750 ILCS 5/213, Illinois recognizes a marriage that was valid where it was formed. 

A couple who legally established a common-law marriage in these states before moving to Illinois keeps their marital status, along with its property and support rights. A couple claiming a valid common law marriage may need to provide proof that the relationship satisfied the requirements of the state where it was formed.

What Happens to Property When an Unmarried Couple Breaks Up?

Illinois' equitable distribution laws only apply to married couples. When a divorce is filed, these laws divide marital property fairly between spouses, regardless of whose name is on the title. 

As unmarried households become more common, many couples are surprised to learn how few legal protections exist outside of marriage. According to the U.S. Census Bureau, unmarried partner households now make up more than 12 percent of all coupled households nationwide. Unmarried couples have no parallel process, which means whoever holds legal title to a house, car, or bank account typically keeps it, even when both partners contributed money or labor toward it over the years.

Illinois courts do allow some property claims between unmarried partners, but not through divorce law. In the 2016 case Blumenthal v. Brewer, the Illinois Supreme Court said unmarried partners cannot use claims such as unjust enrichment to get the same property rights as married couples. The court also made clear that unmarried partners may still pursue claims based on independent legal rights, such as enforcing a valid contract or seeking reimbursement for specific financial contributions in appropriate circumstances.

Can I Get Spousal Maintenance If We Never Married?

Spousal maintenance, often called alimony, is a remedy available only under Illinois divorce law and applies only to couples who were legally married. An unmarried partner has no built-in claim to ongoing financial support after a breakup, regardless of how long the relationship lasted or how financially dependent one partner became on the other.

The only way to create that kind of support obligation between unmarried partners is to put it in writing through an agreement made before or during the relationship.

How Does Illinois Handle Custody and Support for Unmarried Parents?

Under the Illinois Parentage Act of 2015, once parentage has been legally established, unmarried parents go through the same process as divorcing parents for parenting time, decision-making, and child support.

That process usually begins with a voluntary acknowledgment of paternity signed at the hospital, or with a parentage case filed in family court if the parents disagree. 

What Is a Cohabitation Agreement and What Does It Cover?

A cohabitation agreement is a legally enforceable contract that allows unmarried couples to establish rights and responsibilities that Illinois law would not otherwise provide. These agreements typically cover:

• How property gets divided if the relationship ends

• Whether either partner owes support after a breakup

• How shared expenses, like a mortgage or car payment, get split while the couple lives together

• What happens to a shared home if the relationship ends

Couples who buy a home together, combine finances, or plan to have children tend to benefit the most from putting one in place. 

Contact a Chicago, IL Family Law Attorney Today for a Free Consultation 

When an unmarried relationship ends, the legal questions that follow don't come with the built-in structure of Illinois divorce law. The Law Office of George J. Skuros focuses on making sure clients truly understand these issues and know what to realistically expect. Contact our Cook County, IL cohabitation lawyers or call 312-884-1222 to schedule a free consultation.