You built a life together without signing a marriage license. Maybe you share a home, a bank account, a child. Now the relationship is ending, or one of you is worried about what happens if it does, and you are trying to work out where you actually stand.
Here is the short version. Illinois splits your situation into two tracks and treats them almost nothing alike. When it comes to your children, marital status matters far less than most people expect. When it comes to property and money, it matters enormously. Most people guess the wrong way on both.
Key Points
- Illinois has not recognized common law marriage since 1905. Living together for twenty years gives you the same legal standing as living together for two.
- For unmarried parents, establishing parentage is the gate. Until it happens, the parent who did not give birth has no enforceable rights, and the parent who did cannot pursue support through the courts.
- Once parentage is established, Illinois allocates parental responsibilities and parenting time the same way it does for divorcing parents.
- Property is not divided the way marital property is. Protection has to be built deliberately, through titling, written agreements, and estate documents.
Common Law Marriage in Illinois
A common law marriage is one that becomes legally valid without a license or a ceremony, formed just by living together and holding yourselves out as married.
Illinois does not have common law marriage. Common law marriages contracted in Illinois after June 30, 1905 are invalid, and that has been settled law ever since under 750 ILCS 5/214.
This surprises people, because the myth is durable. There is no seven year rule. There is no threshold you cross where the state quietly upgrades your relationship. Filing joint tax returns does not do it. Introducing each other as spouses does not do it. Sharing a last name does not do it.
Time does not create a marriage
A couple who lived together for twenty-five years, raised children, and paid off a mortgage together has exactly the same legal standing at separation as a couple who moved in together last spring. Duration is not a factor Illinois courts weigh, because there is no framework for them to weigh it in.
Common Law Marriages From Other States
There is one exception worth knowing. If you formed a valid common law marriage in a state that recognizes them, Illinois will generally honor it. A handful of states still allow them, and a few others recognize marriages formed before a cutoff date.
This is not a loophole to reach for casually. You would need to prove the marriage was validly formed under that state’s specific requirements, which typically means showing you lived there, intended to be married, and held yourselves out as married while you did. It is a fact-intensive question, and the burden falls on the person claiming the marriage exists.
Civil Unions Are Different
Illinois civil unions, available since 2011 under 750 ILCS 75/, do carry legal status. Partners in a civil union have obligations and protections that parallel marriage under state law, and dissolving one runs through the courts.
Cohabitation alone is not a civil union. If you never filed anything, you are two single people who share an address as far as Illinois law is concerned.
Custody Laws in Illinois for Unmarried Parents
This is the track where the gap between married and unmarried closes almost entirely, with one significant gate in front of it.
Establishing Parentage Comes First
Under the Illinois Parentage Act of 2015, 750 ILCS 46/, a legal parent-child relationship has to exist before a court can allocate anything. Parentage is automatic for the parent who gave birth. For the other parent, when the couple was not married, it has to be established affirmatively.
Until that happens, the practical effect cuts both ways. The parent who did not give birth has no enforceable right to parenting time or decision-making authority, even after living with the child since birth. The parent who did cannot pursue child support through the courts, no matter how long the relationship lasted. Both parents lose something at this stage, which is why it rarely serves either of them to leave it unresolved.
1
Voluntary Acknowledgment of Paternity (VAP)
Both parents sign a VAP, usually at the hospital or later through the Illinois Department of Healthcare and Family Services (HFS). It carries the same weight as a court order.
2
Court order in a parentage action
Either parent, or the child, can file. Genetic testing is typically ordered when parentage is disputed.
3
Administrative order through HFS
The state’s Child Support Services division can establish parentage administratively. This route is built around support and does not resolve parenting time or decision-making.
4
Marriage after the birth, plus the birth certificate
If the parties marry after the child is born and the other parent is named on the birth certificate with their written consent, a presumption of parentage applies. Marriage alone does not do it.
What a Birth Certificate Does Not Do
A name on the birth certificate is not, by itself, a grant of parental rights. This misconception costs unmarried fathers more time than almost any other.
Standing alone, the certificate reflects an acknowledgment. It is not a court order allocating parenting time, and it gives you nothing to enforce if the other parent decides to withhold the child. If you want a schedule a court will back, you need an order that says so.
Test Before You Sign a VAP
A Voluntary Acknowledgment of Paternity is binding the moment it is executed, whether or not genetic testing was ever done. The window to rescind is 60 days, or the date of the first court or administrative proceeding relating to the child in which you are a party, whichever comes first. If you have any doubt about biological parentage, pursue testing before you sign, not after.
Parental Responsibilities and Parenting Time
Illinois retired the words custody and visitation in 2016. The law now allocates two separate things:
- Significant decision-making responsibilities under 750 ILCS 5/602.5, covering education, health care, religion, and extracurricular activities.
- Parenting time under 750 ILCS 5/602.7, meaning the schedule of when the child is with each parent.
If you are searching for sole custody or joint custody, these are the concepts you are looking for. Courts can allocate all decision-making to one parent, split it by category, or require joint agreement. Parenting time is allocated separately, and under 750 ILCS 5/602.8, a parent who has established parentage but was not granted decision-making responsibilities is still entitled to reasonable parenting time, unless the court finds after a hearing that it would seriously endanger the child’s mental, moral, or physical health or significantly impair the child’s emotional development.
The framework is identical for unmarried parents and divorcing parents. Once parentage is established, the same statute governs both, and the same allocation of parental responsibilities analysis applies.
How Illinois Courts Allocate Parenting Time for Unmarried Parents
Yes, an unmarried father can receive equal parenting time. There is no default in favor of mothers once parentage is established, and no rule capping what a father can be allocated. There is also no presumption that time will be split evenly. Establishing parentage opens the door to a schedule, it does not set one.
What the court weighs is the child’s best interests, measured against seventeen factors listed in the statute. The ones that carry the most weight in practice include the caretaking each parent actually performed in the 24 months before the case was filed, any prior agreement or course of conduct between the parents, the child’s adjustment to home, school, and community, and each parent’s willingness to support the child’s relationship with the other parent.
Two things are worth correcting here, because they come up constantly. Out-earning the other parent does not buy parenting time. And the statute expressly bars courts from considering a parent’s conduct when that conduct does not affect the parent’s relationship with the child.
Your Parenting Arrangement Should Be in Writing
Establishing parentage and getting a parenting plan entered as a court order are the two steps that turn an informal understanding into something you can enforce. Our attorneys handle both for unmarried parents. Your first consultation is free.
Child Support for Unmarried Parents
Once parentage is established, either parent can be ordered to pay support. Illinois uses an income shares model under 750 ILCS 5/505, which combines both parents’ net incomes, estimates what the child would receive in an intact household, and divides that obligation between them based on income and the parenting time split.
Marital status is not an input anywhere in that calculation. A child support obligation between unmarried parents is computed exactly as it would be between divorcing ones. You can run rough numbers with the Illinois child support calculator before you speak with anyone to get a rough estimate.
Support and parenting time run on separate tracks
A parent cannot withhold the child because support has not been paid. A parent cannot stop paying because parenting time is being denied. Illinois treats these as independent obligations. The remedy for either problem is a court filing, not withholding the other.
Property Rights for Unmarried Couples
Here, the two tracks diverge sharply. Everything the law does automatically for married couples, it does not do for you.
What Blumenthal v. Brewer Decided
In 2016, the Illinois Supreme Court decided Blumenthal v. Brewer, reaffirming its 1979 decision in Hewitt v. Hewitt. The holding is narrower than it is usually described, and the details matter.
The court held that former cohabitants cannot bring claims for property based on the marriage-like character of their relationship. Theories like constructive trust and unjust enrichment, when they rest on the argument that the couple functioned as spouses, are barred. Recognizing them would undercut the legislature’s decision to abolish common law marriage, and the court said plainly that changing that policy is the legislature’s job, not the judiciary’s.
What that means in practice: years of shared life, contributions to a household, and sacrifices made for a partner’s career do not create a claim on that partner’s property.
What Still Protects You in Unmarried Breakups
What holds up
- Property titled in both names.
- Written agreements between you.
- Claims that stand independent of the relationship, including a partition action to divide jointly owned real estate.
- Ordinary contract claims that would exist between any two people.
What does not
- An expectation of a share based on how long you were together.
- Contributions toward a mortgage on a house titled solely to your partner.
- Anything resembling maintenance, alimony, or a marital estate.
That distinction is what most coverage of this case gets wrong. Blumenthal did not strip cohabitants of the ability to own property together or contract with each other. It closed the door on asking a court to imply marital rights that were never created.
No Maintenance, No Automatic Share
There is no spousal support between former partners, in any amount, for any duration. There is no marital estate to divide, so the marital and non-marital property analysis that governs a divorce simply does not apply.
Assets in your partner’s name are your partner’s assets. Assets in yours are yours. Jointly titled property is divided according to how it is titled, which is a question of property law rather than family law.
Cohabitation Agreements in Illinois
A cohabitation agreement is the practical answer to everything above, and Blumenthal left it fully available. It is a contract, enforceable on contract terms, and it can do most of what an unmarried couple actually needs.
A useful one typically addresses who owns the home and what happens to it if you separate, how contributions to a mortgage or renovation on a solely titled property will be credited, what happens to joint accounts, and how significant shared purchases are handled. Couples who intend to marry later sometimes find that a prenuptial agreement covers the same ground more durably.
One question worth closing off, because it comes up often: claiming a partner as a dependent on a federal tax return is possible in narrow circumstances under IRS rules, and it is a federal tax question rather than an Illinois family law one. It creates no property, inheritance, or support rights under state law.
Inheritance Rights for Unmarried Partners
This is the part almost nobody plans for, and it produces the worst outcomes.
If your partner dies without a will, you inherit nothing. Illinois intestate succession under 755 ILCS 5/2-1 passes the estate to a surviving spouse and children, then to parents and siblings, and continues down a statutory list. An unmarried partner is not on it, regardless of how long you lived together or whose income paid for the house.
Two related gaps compound the problem. Authority to make health care decisions does not pass to a partner automatically, so without a health care power of attorney, that authority sits with family members who may disagree with you. And beneficiary designations on retirement accounts and life insurance operate outside a will entirely, which means an outdated designation naming a parent or a former partner controls, no matter what any other document says.
All of this is fixable, and it is usually the most straightforward problem on this page to solve. A basic estate plan closes every one of these gaps.
Five Steps That Change Your Legal Position.
Each of these is straightforward on its own, and each one closes a specific gap Illinois law leaves open for unmarried couples.
1
Step
Establish parentage
If you share a child, resolve this first. Nothing else about parenting time or support can be enforced until it is done.
2
Step
Get the parenting arrangement into a court order
An informal schedule that works today gives you nothing to enforce the day it stops working.
3
Step
Check how everything is titled
Pull the deed, the vehicle titles, and the account registrations. Titling determines ownership, and most couples are wrong about at least one item.
4
Step
Put your agreement in writing
A cohabitation agreement is enforceable where an understanding is not.
5
Step
Execute a will, powers of attorney, and beneficiary designations
These are the documents that protect you if the relationship ends by death rather than separation.
Talk to a DuPage County Family Law Attorney
Illinois law leaves unmarried couples with fewer automatic protections than most people assume, and the protections that do exist have to be built rather than presumed. That cuts both ways depending on where you are standing. If you are the parent seeking a schedule you can enforce, or the one responding to a petition. If you are the partner who contributed to a home you do not hold title to, or the one who does.
Our family law attorneys represent clients on both sides of these matters in DuPage County and throughout Cook, Kane, Will, and Kendall Counties. Your first consultation is free.