Reviewed by Joshua P. Haid, Managing Partner
How to Establish Paternity in Illinois
For an unmarried mother, establishing paternity is not a technicality — it is usually the key that unlocks child support and secures your child’s rights. When you give birth, you are automatically your child’s legal parent. But an unmarried father is not: until his paternity is legally established, he has no obligation to support your child, and your child has no legal claim to his income, inheritance, health coverage, or benefits. Establishing paternity is how you change that.
Some mothers pursue paternity because the father agrees and simply needs to be recognized; others because he denies the child is his or refuses to help. Either way, the law gives you a path forward, and you do not have to walk it alone. The Women’s Divorce & Family Law Group by Haid and Teich LLP helps mothers across Chicagoland establish paternity and secure the support their children are owed.
Establishing paternity is how you secure support for your child. Talk with a Chicago family lawyer who represents mothers — free, confidential consultation, call 312-445-8830.
Why establishing paternity matters
Paternity is the legal foundation for almost everything that follows. Most importantly for many mothers, a father has no legal obligation to pay child support until his paternity is established — so if you are relying on informal, on-and-off payments, formalizing paternity is what makes support enforceable. Beyond support, establishing paternity gives your child important rights: to inherit from the father, to access his medical history, and to receive benefits such as Social Security or health insurance through him. It also settles the child’s legal parentage for life. For your child’s security, this is one of the most important steps you can take.
How is paternity established in Illinois?
Under the Illinois Parentage Act (750 ILCS 46), there are a few ways paternity is established:
- Marriage (presumption). If you were married or in a civil union with the father around the time of the birth, he is legally presumed to be the father.
- Voluntary Acknowledgment of Parentage (VAP). If you both agree on paternity, you and the father sign a VAP — a legal form available at the hospital, the county clerk, or a child support office. Once both of you sign and it is filed, it has the same legal effect as a court order of paternity.
- Administrative order through the state. The Illinois Department of Healthcare and Family Services (HFS) can establish paternity administratively, including through genetic testing, which is free for you and your child. This route is often used when opening a child support case.
- Court order. A judge can establish paternity, ordering DNA testing where paternity is disputed.
What if the father denies it or refuses to sign?
You still have a clear path. If the father will not sign a VAP or denies that he is the father, you do not simply lose the right to support. You can open a case through the state’s child support services (HFS), which can order genetic testing — free to you — and enter an administrative paternity order; if the alleged father is properly notified and fails to appear for the interview or testing, paternity can be established by default. You can also pursue paternity through the court, where a judge can order DNA testing. In Illinois, a man is legally considered the father when DNA testing shows he is overwhelmingly likely to be. In short, a father cannot avoid his responsibilities simply by refusing to cooperate.
Before you sign a VAP
One important caution. A Voluntary Acknowledgment of Parentage is powerful and, once filed, is hard to undo — so it deserves care. You have 60 days to rescind it; after that, it can only be challenged on narrow grounds like fraud, duress, or a material mistake, and only within a limited time. So if there is any genuine question about who the father is, it is wiser to confirm paternity through genetic testing before signing rather than after. It is also worth knowing what a VAP does and does not do: it establishes the father as a legal parent — which supports your child support claim — but it does not, by itself, give him custody or parenting time. Those require a separate court order.
How we help you
Our role is to make this straightforward and to protect you at each step. We help you choose the right path to establish paternity for your situation, pursue it through the state or the courts if the father denies or refuses, and move directly from paternity to securing a child support order. If the father later seeks parenting time, we make sure any arrangement genuinely serves your child. And if you are being asked to sign a VAP and are unsure, we help you understand what you are signing before you sign it. The goal throughout is your child’s security and your peace of mind.
Related: Custody for Unmarried Mothers · Child Support · Child Custody · Mothers’ Rights
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