Does Signing a Birth Certificate Establish Paternity in Indiana?

Signing the birth certificate does not establish paternity in Indiana. For unmarried parents, the birth certificate is a vital record and nothing more; legal fatherhood is created by a separate document called the Paternity Affidavit, or by a court order. Without one of those, an unmarried father has no legal relationship to the child, no matter what the birth certificate says.

In fact, if unmarried parents don’t complete a Paternity Affidavit, the father’s name won’t appear on the birth certificate at all, and the child will carry the mother’s surname.¹ Once the affidavit is signed and filed, the father’s name is added to the birth record and the child may take either parent’s last name.

What the Paternity Affidavit Actually Does

A properly signed Paternity Affidavit carries the same legal weight as a court-issued paternity decree. It creates the parent-child relationship without a hearing, and with it come the father’s duty to pay child support and his standing to seek custody or parenting time.²

The form asks each parent for their full legal name, residential address, date of birth, and Social Security number, and it includes a written explanation of what signing means.² Both signatures must be witnessed by a notary or an authorized witness at the hospital or health department.³

One provision inside the form is easy to miss. A checkbox on the affidavit lets both parents agree to joint legal custody, giving each shared authority over the child’s education, healthcare, and religious upbringing, plus equal access to school and medical records. That agreement is only valid if genetic test results confirming the biological relationship are submitted to a local health officer within 60 days of the birth. Skip the box, or skip the testing, and the mother has sole legal custody by default unless a court later says otherwise.² Physical custody stays with the mother either way; changing that requires a court case.

Where and When to Sign

For hospital births, the affidavit must be completed within 72 hours after the child is born.² Newborn coordinators typically walk parents through the form.

If you miss that window, or the birth didn’t happen in a hospital, you can complete the affidavit at any local health department up until the child reaches emancipation.⁴ There’s no hard deadline in that scenario, but every day paternity goes unestablished is a day the father has no legal rights and the child has no legal protections tied to him. The signed form goes to the local health officer, who forwards it to the Indiana State Department of Health to update the birth record.⁵

Signing Waives the Right to a Paternity Trial

Signing the affidavit gives up the right to a trial and to genetic testing on the question of paternity. Indiana gives the father a 60-day window to change his mind, but rescinding is not a matter of filling out a form. The father must file an action in a court with paternity jurisdiction, and he may have to undergo and pay for genetic testing.² No reason has to be given within those 60 days, but only the father can rescind. The mother cannot.¹

After 60 days, the affidavit becomes very hard to undo. A court will only set it aside on proof of fraud, duress, or a material mistake of fact.² Indiana courts enforce the deadline strictly. Even genetic test results showing the man is not the biological father may not be enough after the window closes.¹

If the Mother Is Married, Different Rules Apply

Everything above is about unmarried parents. When the mother is married, Indiana law presumes her husband is the biological father of any child born during the marriage or within 300 days after it ends by death, annulment, or divorce.⁶ A married father does not sign a Paternity Affidavit because the law already treats him as the legal father. Rebutting that presumption, whether by the husband or another man claiming to be the biological father, takes a court action and genetic testing.

What the Father and Child Lose Without Established Paternity

Without a Paternity Affidavit or court order, the father is a legal stranger to the child. He has no right to custody or parenting time, and the mother has sole legal custody by default.

The consequences reach beyond custody. A child born outside marriage cannot inherit from the father under Indiana’s intestate succession rules unless paternity has been legally established. A signed Paternity Affidavit under IC 16-37-2-2.1 satisfies that requirement, and a court order does too, though the timing rules vary with the child’s age and whether the father is still living. Once paternity is established, the child is treated as if the parents had been married at birth, and inheritance runs in both directions through the father’s entire family.⁷

Government benefits work the same way. Social Security survivor and dependent benefits tied to the father’s record require the Social Security Administration to verify the parent-child relationship, and a Paternity Affidavit or court order provides that verification. Health insurance coverage through the father’s employer, and dependent-related tax benefits, all become simpler once the legal relationship exists.

There is also the adoption problem. An unmarried father who has not signed a Paternity Affidavit and has not established paternity in court can register with Indiana’s putative father registry to preserve his right to be notified of any adoption or termination proceeding involving his child. A father who does not register waives that notice and gives irrevocable implied consent to the adoption, which means the child can be adopted without him ever knowing. Hospital staff are required to inform the mother that the registry exists when a child is born outside of marriage.⁵ Signing the affidavit removes the risk because notice and consent then flow to a legal parent.

Establishing Paternity Through Court

When the parents disagree, or when the father won’t sign, paternity has to be established in court. Indiana law allows the mother, the alleged father, the child, or the Department of Child Services to file the case.⁸ Each county assigns paternity cases to a designated court.⁹

Either party can request genetic testing, and the judge must grant it. A court-approved expert handles the testing, usually with a cheek swab from the child and the potential father.¹⁰ Court-admissible tests generally cost a few hundred dollars.

A court order goes further than the affidavit in one respect: the judge can set child support, decide custody and parenting time, and resolve related issues in the same case. With an affidavit alone, either parent has to file a separate action to get court-ordered support or a parenting-time schedule.

1
Indiana Department of Child Services. Establishing Paternity
2
Indiana General Assembly. Indiana Code 16-37-2-2.1 – Paternity Affidavits; Requirements; Forms; Joint Legal Custody Agreement; Penalty; Effect of Paternity Affidavit; Genetic Test; Opportunity to Consult
3
Indiana Department of Health. Paternity Affidavit – SF 44780
4
Indiana Department of Child Services. Paternity
5
Indiana General Assembly. Indiana Code 16-37-2-2 – Birth Certificate and Paternity Affidavit
6
Indiana General Assembly. Indiana Code 31-14-7-1 – Presumptions; Childs Biological Father
7
Indiana General Assembly. Indiana Code 29-1-2-7 – Children Born Out of Wedlock; Inheritance
8
Indiana General Assembly. Indiana Code 31-14-4-1 – Persons Permitted to File Action
9
Indiana Department of Child Services. Judicial Establishment of Paternity
10
Indiana General Assembly. Indiana Code 31-14-6-1 – Blood or Genetic Testing