An acknowledgment of paternity (AOP) is a legal form signed by a child’s mother and biological father, under penalty of perjury, that establishes the man as the child’s legal father when the parents are not married. Once filed with the state’s vital records office, it has the same effect as a court finding of paternity and puts the father’s name on the birth certificate.
The form is simple, but the signing rules are not the same everywhere. Some states require a notary, one requires a notary and two witnesses, and Texas does not allow a notary at all. This guide explains what the acknowledgement of paternity does, the federal rules every state follows, how the signing requirements differ, how to rescind an AOP, and what unmarried parents in the UK sign instead.
Key Takeaways
- Purpose: an acknowledgment of paternity makes the biological father the legal father without going to court. Both parents sign it voluntarily.
- Effect: under federal law a signed acknowledgment is “a legal finding of paternity”. It adds the father to the birth certificate and triggers rights and duties on both sides, including child support.
- Signing: every state uses its own form. Texas requires signing with an AOP-certified entity; Arkansas and New Mexico require a notary; Virginia requires an oath; Louisiana requires an authentic act before a notary and two witnesses; New York requires two unrelated witnesses.
- Changing your mind: either signer can rescind within 60 days, or before the first court or agency proceeding about the child if that comes sooner. After that, only fraud, duress or a material mistake of fact can undo it.
- UK: there is no AOP. Unmarried parents sign the birth register together or use a statutory declaration of parentage, which is sworn before a notary or solicitor.
What Is an Acknowledgment of Paternity?
An acknowledgment of paternity is a sworn written statement in which a man declares that he is the biological father of a child, and the child’s mother confirms it. Both parents sign the state’s official form, and the form is filed with the vital records or child support agency. From that point the man is the child’s legal father, with the same rights and duties as if he had been married to the mother when the child was born.
The document goes by several names. Most states call it an Acknowledgment of Paternity or Voluntary Acknowledgment of Paternity (AOP or VAP); New York uses Acknowledgment of Parentage, and some states use “paternity affidavit” or “declaration of paternity”. Both spellings, acknowledgment and acknowledgement, are in use and mean the same thing.
An AOP is only for unmarried parents. When the mother is married, the law presumes her husband is the father, and the acknowledgment cannot be used unless the husband also signs a denial of paternity. The AOP also cannot be used if another man has already been acknowledged or adjudicated as the father.
Why Establishing Paternity Matters
Until paternity is established, an unmarried father has no legal rights to the child, and the child has no legal claim on the father. Texas Law Help lists the consequences plainly: a court cannot order child support until paternity is established, and a child may not be able to claim Social Security, insurance, inheritance or veterans’ benefits from the father.
Paternity can be established in three ways: by legal presumption when the parents are married, by filing an acknowledgment of paternity, or by a court order, usually after genetic testing. The acknowledgment is the fastest and cheapest route when both parents agree. In most states it is free and can be completed at the hospital before the mother and baby go home.
For the father, the acknowledgment is what allows him to ask for custody or visitation and to appear on the birth certificate. For the child, it secures financial support and a legal family history. For the mother, it is what makes a child support order possible without a paternity suit.
How the Acknowledgment of Paternity Works: The Federal Rules
Every state runs its own paternity program, but all of them follow the same federal framework in 42 U.S.C. § 666(a)(5), the law that ties child support funding to state procedures.
- Information before signing. Before a mother and a putative father can sign, the state must tell them, orally and in writing, about the alternatives to signing, the legal consequences, and the rights and responsibilities that follow. That is why hospitals and certified entities walk parents through the form rather than simply handing it over.
- Hospital-based programs. States must offer the acknowledgment at the hospital around the time of birth, and the vital records agency must offer it afterwards.
- A legal finding of paternity. A signed voluntary acknowledgment “is considered a legal finding of paternity”. No court has to ratify it.
- Birth certificate rule. For a child of unmarried parents, the father’s name goes on the birth record only if both parents signed an acknowledgment or a court or agency has adjudicated paternity.
- Full faith and credit. An acknowledgment signed under one state’s procedures must be recognised by every other state.
The same section sets the rescission and challenge rules described below, which is why they are nearly identical from state to state.
Does an Acknowledgment of Paternity Need to Be Notarized?
It depends on the state. The federal rules require a sworn affidavit but leave the signing formalities to each state, and the differences matter because signing in the wrong way makes the form invalid.
| State | Who must witness the signatures | Source |
|---|---|---|
| Texas | An AOP-certified entity (hospital, birth registrar or child support office). A notary is not used, and the form is only available through certified entities. | Texas Attorney General, Texas Law Help |
| Arkansas | A Notary Public witnesses and notarizes both parents’ signatures. Parents do not have to be in Arkansas. | Arkansas Department of Finance and Administration |
| Virginia | A voluntary written statement of the father and mother “made under oath”, so the signatures are sworn before an official authorized to administer oaths, in practice a notary. | Va. Code § 20-49.1 |
| New Mexico | The acknowledgment of paternity statement “must be sworn to by the biological parents in the presence of a notary public”. | New Mexico Department of Health |
| Louisiana | An authentic act: executed before a notary public in the presence of two witnesses and signed by each parent, each witness and the notary. The parents need not sign at the same time, place or before the same notary. | La. R.S. 9:392 and La. Civ. Code art. 1833 |
| New York | The Acknowledgment of Parentage must be “witnessed by two persons not related to the signatory”. No notary is required for the initial acknowledgment. | N.Y. Public Health Law § 4135-b |
Two practical rules follow from the table. First, never sign the form at home: the signature has to be made in front of the notary, witnesses or certified entity named by your state. Second, use your own state’s form. A generic paternity affidavit downloaded from the internet is not an acknowledgment of paternity and will not be filed.
Where a notary is required, the notary must see you sign and check your photo ID, so the notarization is done in person at the notary’s office, the hospital or the vital records office. Our guide to notarizing a birth certificate explains the related certified-copy process that often follows.
How to Complete an Acknowledgment of Paternity Step by Step
The exact procedure is set by your state, but the sequence is the same almost everywhere.
1. Get the official form from the right place
At the hospital, the birth clerk provides it. After the birth, contact the state vital records office, the local birth registrar or the child support agency. In Texas, only an AOP-certified entity can provide the form; the Vital Statistics Unit will not mail it. Several states, including Virginia, publish the form online for download.
2. Read the rights and responsibilities notice
Federal law requires the state to explain the alternatives, consequences, rights and duties before you sign. Read the notice and ask questions. By signing, the father accepts financial responsibility for the child, and the mother accepts that the father can seek custody and visitation.
3. Check for a presumed father
If the mother was married when the child was born, or within 300 days before the birth, her husband or former husband is the presumed father. He must sign a denial of paternity before the biological father’s acknowledgment can take effect. In Texas the denial is a section of the same form.
4. Sign in front of the required official
Both parents sign under penalty of perjury. Depending on the state, the signing happens before a notary, a notary and two witnesses, two unrelated witnesses, or a certified entity. The parents do not always have to sign at the same time or in the same place: Louisiana’s authentic act may be executed at different times and before different notaries, and Texas offers help by phone for a parent in another state, in the military or in prison.
5. File the form
The hospital, certified entity or notary usually files the acknowledgment with the vital records office. If you complete it yourself, file it as the form instructs. The acknowledgment takes effect on the date it is filed, or on the child’s birth date if it was filed before the birth.
6. Request the updated birth certificate
Once the acknowledgment is on file, the father’s name is added to the birth record and a new certified copy can be ordered. In Arkansas and several other states, the acknowledgment can also change the child’s last name.
Can an Acknowledgment of Paternity Be Rescinded?
Yes, but only within a short window. Under 42 U.S.C. § 666(a)(5)(D)(ii), either signer can rescind the acknowledgment within the earlier of 60 days after signing or the date of the first administrative or judicial proceeding relating to the child in which that signer is a party, including a child support proceeding. States provide a rescission form for this, filed with the vital records office; New York and Louisiana route the rescission through a court petition instead.
After the 60 days, the acknowledgment can only be challenged in court, and only on the basis of fraud, duress or a material mistake of fact. The person challenging it carries the burden of proof, and the father’s obligations, including child support, continue during the challenge unless the court finds good cause to suspend them. A later DNA test showing that the signer is not the biological father does not automatically cancel the acknowledgment; it is evidence in that court challenge.
Common Mistakes With the AOP
- Signing before the appointment. Signatures made outside the presence of the notary, witnesses or certified entity are invalid, because the signature must be sworn or witnessed at the moment it is made.
- Using the wrong form. A generic “paternity affidavit” from a template site is not the state’s acknowledgment and will not be filed.
- Ignoring a presumed father. If the mother was married at or near the birth, the acknowledgment is invalid without a denial of paternity from the husband.
- Missing the 60-day window. After it closes, the only way out is a court case alleging fraud, duress or mistake.
- Assuming the birth certificate is enough. For unmarried parents, the father’s name only appears on the birth certificate because an acknowledgment or court order exists. The certificate reflects paternity; it does not create it.
Parents Living Abroad or in Different States
An acknowledgment signed under one state’s rules is valid in every other state. If the parents live in different states, each can usually sign in front of a notary or certified entity where they are, and Arkansas confirms that parents do not need to be in the state to complete its form. Texas runs a hotline for parents outside the state and for fathers who are deployed or incarcerated.
If a parent is outside the United States, the state’s instructions decide what is accepted. Where the state requires a notary who witnesses the signature in person, a U.S. embassy or consulate notarial appointment is the usual route. Ask the vital records office before travelling or paying for a local notary, because some states will not accept a foreign notarization on this form.
Acknowledging Parentage in the UK
England and Wales have no acknowledgment of paternity form. According to GOV.UK, unmarried parents can both appear on the birth certificate in one of three ways: they sign the birth register together, one parent completes a statutory declaration of parentage form that the other parent takes to the registration, or one parent registers with a court order giving the father parental responsibility.
The statutory declaration route is the one families use when the father cannot attend the register office, for example because he is working abroad. A statutory declaration is a written statement declared to be true before a solicitor, a commissioner for oaths or a Notary Public. Our page on the statutory declaration form explains the format, and NotaryPublic24’s UK notarization service can handle the declaration itself online, with delivery within 24 hours.
How NotaryPublic24 Can Help
U.S. acknowledgment of paternity forms must be signed in front of the official your state names, usually a local notary, the hospital or a certified entity, so NotaryPublic24 does not notarize the AOP itself. Where NotaryPublic24 helps is with the documents around it.
For a UK statutory declaration of parentage, a notarized affidavit of birth or affidavit of relationship for immigration, or a notarized copy of a birth certificate for use in another country, you upload the document, complete the checkout and verify your identity with a biometric and ID check. A qualified Notary Public is appointed to the case, and you receive the notarized document as a secure PDF within 24 hours. If the document is going abroad, an Apostille can be added so it is recognised in every Hague Convention country. Unsure whether your document qualifies? Contact support before ordering and you will usually have an answer within minutes.
Frequently Asked Questions
What is the meaning of acknowledgement of paternity?
An acknowledgement of paternity is a sworn form signed by a child’s mother and biological father, under penalty of perjury, stating that the man is the child’s father. Once filed with the state, it is a legal finding of paternity: the man becomes the legal father and is added to the birth certificate.
How does a father acknowledge paternity?
An unmarried father acknowledges paternity by signing the state’s acknowledgment of paternity form together with the mother, usually at the hospital or later at the vital records office, child support agency or a certified entity. The signatures are made in front of a notary, witnesses or a certified official, and the form is then filed with the state.
What are the basic requirements of acknowledgement of paternity?
The parents must be unmarried to each other, the mother must not have a presumed husband unless he signs a denial, and no other man may already be the acknowledged father. Both parents sign the official state form under penalty of perjury, in front of the official the state requires, and the form is filed with vital records.
Does an acknowledgment of paternity need to be notarized?
In many states, yes: Arkansas and New Mexico require a notary, Virginia requires the statement to be made under oath, and Louisiana requires a notary and two witnesses. Texas is different: the form is signed with an AOP-certified entity, and New York uses two unrelated witnesses instead. Never sign before you are in front of the required official.
How does acknowledgement of paternity work?
Both parents receive a notice of their rights and responsibilities, sign the state’s form in front of the required official, and the form is filed with the vital records office. From the filing date the man is the legal father, the birth certificate is updated, and either parent has 60 days to rescind before the acknowledgment becomes final.
How do I get a copy of an acknowledgement of paternity?
Request it from the agency that holds the file, which is usually the state vital records office or the child support agency. New York parents, for example, order copies of the Acknowledgment of Parentage through the state. You will need the child’s details, identification and, in most states, a small fee.
What happens if the father refuses to acknowledge paternity?
If the father will not sign, the mother, the child support agency or the father himself can ask a court to establish paternity, normally with genetic testing. A court order has the same effect as an acknowledgment: it makes the man the legal father, allows child support to be ordered, and adds his name to the birth certificate.
Can an acknowledgment of paternity be rescinded?
Yes. Either signer can rescind within 60 days of signing, or before the first court or agency proceeding about the child if that comes first, by filing the state’s rescission form. After that, the acknowledgment can be set aside only by a court, and only for fraud, duress or a material mistake of fact.