How to Establish Paternity in the United States
Reviewed by DocDraft Legal Team · United States · Last updated September 12, 2026
Establishing paternity means legally identifying a child's father or second parent so the child gains rights to support, custody and visitation, health coverage, inheritance, and benefits. In every state there are two main paths. Unmarried parents who agree can sign a Voluntary Acknowledgment of Paternity, sometimes called a Voluntary Declaration of Parentage, usually at the hospital after birth or later at the state child-support agency. This process is federally mandated for every state that receives federal child-support funding (42 U.S.C. 666(a)(5); 45 CFR 303.5), and one rule is uniform nationwide: after signing, either parent generally has 60 days to rescind the acknowledgment. Once that window closes, a signed acknowledgment carries the force of a court judgment and can be challenged only on narrow grounds such as fraud, duress, or material mistake of fact, and even a later genetic test may not be enough to undo it. When parents do not agree, or a child is born during a marriage, a court decides parentage, often after ordering genetic testing. Almost everything else varies by state: the statute of limitations to bring a court paternity action, the marital presumption of paternity and how it is rebutted, the genetic-testing probability threshold, the agency that handles cases, and the exact acknowledgment form. Attorney review of your situation is available through DocDraft.
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How do I establish paternity?
There are two common routes. Unmarried parents who agree can sign a Voluntary Acknowledgment of Paternity, often at the hospital after birth or later at the state child-support agency. When parents disagree, or a child is born during a marriage, a court decides parentage, often after ordering genetic testing. The exact form and agency vary by state.
How long do I have to cancel a Voluntary Acknowledgment of Paternity?
Under federal law, either parent generally has 60 days from signing to rescind a Voluntary Acknowledgment of Paternity (42 U.S.C. 666(a)(5)). After 60 days it carries the force of a judgment and can be challenged only on narrow grounds such as fraud, duress, or material mistake of fact, and a later genetic test may not undo it.
How long do I have to establish paternity in court?
The deadline to bring a court action to establish paternity varies widely by state. Some states allow it at any time, while others cut it off years after the child reaches adulthood, and some set a shorter window to challenge a marital presumption. Because a missed deadline can forfeit rights, check your state's rule.
Frequently Asked Questions
Establishing paternity is the legal process of identifying a child's father or second parent. It gives the child rights to financial support, custody and visitation with both parents, health coverage, inheritance, and benefits such as Social Security. Parentage can be established by a signed acknowledgment or by a court order determining the parent-child relationship.
A Voluntary Acknowledgment of Paternity is a form unmarried parents sign to establish a legal parent-child relationship without going to court. It is offered in every state under a federally required program, often at the hospital after birth. Once filed and past the rescission window, it generally carries the force of a court judgment.
Under federal law, either signer generally has 60 days to rescind a Voluntary Acknowledgment of Paternity (42 U.S.C. 666(a)(5); 45 CFR 303.5). After that window closes, it can be challenged only on limited grounds such as fraud, duress, or material mistake of fact. A later genetic test alone may not be enough to set it aside.
Yes. The statute of limitations to bring a court paternity action differs sharply among states. Some allow an action at any time, others cut it off years after the child reaches adulthood, and some impose a shorter deadline to challenge a marital presumption of paternity. Check the deadline for the specific state involved.
Many states presume that a person married to the child's birth parent at the time of birth is the child's legal parent. How strong that presumption is, and how and when it can be rebutted, varies by state. Some require clear and convincing evidence or genetic testing, and some set a firm deadline to challenge it.
Not always. Parents who agree can establish paternity by signing an acknowledgment without any testing. When parentage is disputed, a court usually orders genetic testing. The probability threshold that establishes a presumption of parentage is set by statute and varies by state, commonly in the range of 95 to 99 percent.
Each state runs a child-support agency that administers the voluntary acknowledgment program and can open a case to establish parentage and support. When parentage is contested, a state trial court decides it and can order genetic testing before entering a judgment. The agency's name and the process differ from state to state.
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