How Long Does a Father Have to Establish Paternity in Texas?

How long a father has to establish paternity in Texas depends on one question: does the child already have a presumed father? If no man is legally presumed, acknowledged, or adjudicated to be the father, a paternity case can be filed at any time, even after the child becomes an adult.¹ If someone is already the presumed father, the window generally closes on the child’s fourth birthday, with two narrow exceptions.² A separate set of deadlines applies to voluntary Acknowledgments of Paternity.

No Presumed Father Means No Deadline

When a child has no presumed, acknowledged, or adjudicated father, Texas imposes no statute of limitations on a paternity proceeding. The case can be brought during the child’s minority, during adulthood, and even if an earlier proceeding was dismissed because of a time limit that existed under prior law.¹

This matters most for unmarried fathers where no other man has stepped into a legal parental role, and for adult children who want to establish a biological relationship for inheritance or benefits. No deadline does not mean no cost to waiting. Each year without an order is a year without enforceable custody or visitation and without court-ordered support. Courts can order retroactive child support once paternity is adjudicated, which cuts in both directions depending on which side you are on.

The Four-Year Deadline When There Is a Presumed Father

If the child already has a presumed father, any proceeding to adjudicate parentage must be filed before the child’s fourth birthday. This limit applies whether the case is brought by the presumed father, the mother, or any other person seeking to challenge or establish parentage.²

Four years is the hard rule, and it runs from the child’s birth, not from the date a father learns of the pregnancy, the birth, or a possible paternity dispute. A biological father who waits past that date to challenge another man’s presumption of paternity is generally out of time.

Two Exceptions That Can Reopen the Window

A court can hear a paternity case after the four-year deadline in two situations. The first is a finding that the presumed father and the mother never lived together and never had sexual intercourse during the probable time of conception. The second is a finding that the presumed father was prevented from filing earlier because he was misled by misrepresentations into believing the child was biologically his.²

The misrepresentation exception comes up more often than people expect. A man who discovers years later, through DNA testing or a disclosure, that the child he raised is not biologically his can potentially bring a case despite the four-year cutoff.

Who Counts as a Presumed Father

Because the deadline turns on whether a presumed father exists, it helps to know who the statute treats that way. A man is presumed to be the father of a child in any of these situations:³

He was married to the mother when the child was born.
The child was born within 300 days after the marriage ended by divorce, annulment, or the husband’s death.
He married the mother before the birth in apparent compliance with law, even if the marriage was later found invalid, and the child was born during or within 300 days after that marriage ended.
He married the mother after the birth and voluntarily asserted paternity by filing a statement with the Vital Statistics Unit, being named on the birth certificate, or promising in writing to support the child.
During the child’s first two years, he continuously lived in the same household as the child and represented to others that the child was his own.

That last category catches people by surprise. A man who is not married to the mother and not biologically related can still become the presumed father simply by living with the child and holding the child out as his during those first two years. Once that presumption attaches, the four-year clock controls any later challenge.

Deadlines for a Voluntary Acknowledgment of Paternity

When both parents agree, the simplest route is a signed Acknowledgment of Paternity (AOP). Both the mother and the man claiming to be the biological father sign the form voluntarily with the intent to establish paternity.⁴ Hospitals offer the form at birth and file it with the Texas Vital Statistics Unit, and an AOP can also be signed later through any AOP-certified entity.⁵ There is no hard deadline for signing one, but two time limits control how permanent it becomes.

The 60-Day Rescission Window

A signatory can rescind an AOP within 60 days of its effective date, or before a court proceeding related to the child begins, whichever comes first.⁶ Rescission inside that window is straightforward and does not require proving fraud or any other special ground.

Challenges After the 60 Days Expire

Once the rescission period ends, a signatory can only contest the AOP by proving fraud, duress, or a material mistake of fact. Genetic test results showing the signatory is not the biological father qualify as a material mistake of fact.⁷

Timing is sharp here. A challenge on those grounds can be filed at any point before a court issues an order affecting the child, including a child support order. Once such an order has been entered, no collateral attack on the AOP can be maintained.⁷ A man who signed an AOP, had a support order entered on it, and later learns through DNA testing that he is not the biological father generally cannot undo the AOP. The person bringing the challenge also carries the burden of proof.

Why Waiting Hurts Even When the Law Allows It

Without a legally established father, a child born outside of marriage cannot inherit from a biological father in Texas unless one of the recognized methods applies: a statutory presumption, a court adjudication, an adoption, or a signed AOP. If none of those steps happened during the father’s lifetime, the child can still petition the probate court for a determination of inheritance rights, but the court must find by clear and convincing evidence that the deceased was the biological father.⁸ Proving biological parentage after someone has died is harder and more expensive than doing it while both parties are alive, and may depend on DNA testing of surviving relatives.

Federal benefit programs apply the same logic. Social Security survivor benefits generally require proof of a legal parent-child relationship, and a child whose father died without being on the birth certificate or otherwise legally established as the father often needs additional evidence, such as DNA testing or a prior court order, to qualify. Veterans’ benefits for a dependent child likewise require documentation of the parent-child relationship.⁹ On the tax side, a father who establishes paternity and meets the dependency rules may claim the Child Tax Credit, worth up to $2,200 per qualifying child for the 2025 tax year.¹⁰

Paternity also opens the door to custody and visitation, but it does not deliver them automatically. Those are separate orders. What paternity provides is standing to ask for them. Without an established legal relationship, a biological father has no basis to petition for conservatorship or a possession schedule in Texas. The sooner paternity is in place, the sooner any of these rights, obligations, and benefits can be enforced.

1
State of Texas. Texas Family Code 160.606 – No Time Limitation: Child Having No Presumed, Acknowledged, or Adjudicated Father
2
State of Texas. Texas Family Code 160.607 – Time Limitation: Child Having Presumed Father
3
State of Texas. Texas Family Code 160.204 – Presumption of Paternity
4
State of Texas. Texas Family Code 160.301 – Acknowledgment of Paternity
5
Office of the Attorney General of Texas. Acknowledgment of Paternity (AOP)
6
State of Texas. Texas Family Code 160.307 – Procedures for Rescission
7
State of Texas. Texas Family Code 160.308 – Challenge After Expiration of Period for Rescission
8
State of Texas. Texas Estates Code 201.052 – Paternal Inheritance
9
Department of Veterans Affairs. Manage Dependents for Disability, Pension, or DIC Benefits
10
Internal Revenue Service. Child Tax Credit