How to Establish Paternity in Pennsylvania
Reviewed by DocDraft Legal Team · Pennsylvania · Last updated 2026-09-12
In Pennsylvania, establishing paternity means legally identifying a child's father so the child gains rights to support, custody and visitation, health coverage, inheritance, and benefits. There are two main paths. Unmarried parents who agree can sign an Acknowledgment of Paternity, which under 23 Pa.C.S. 5103 has the same effect as an order of the court once filed and lets the father be added to the birth certificate. Either signer may cancel it within 60 days, and after that federal window it can be challenged only for fraud, duress, or a material mistake of fact (42 U.S.C. 666(a)(5)). When parents do not agree, a court decides paternity. Pennsylvania's load-bearing rule is a firm statute of limitations: an action to establish the paternity of a child born out of wedlock must be commenced within 18 years of the child's date of birth (23 Pa.C.S. 4343(b)). A child born to a married woman is presumed to be a child of the marriage, a strong presumption that can be overcome where genetic testing shows the husband is not the father (23 Pa.C.S. 5104(g)). In a disputed case, genetic test results showing a 99 percent or greater probability create a presumption of paternity that can be rebutted only by clear and convincing evidence that the results are unreliable (23 Pa.C.S. 4343(c)(2)). Attorney review of your situation is available through DocDraft.
Find out where you stand in Pennsylvania
Where are you in establishing paternity?
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How do I establish paternity in Pennsylvania?
There are two routes. Unmarried parents who agree can sign an Acknowledgment of Paternity, which under 23 Pa.C.S. 5103 has the same effect as a court order once filed. If the parents disagree, a court in the county Domestic Relations Section determines paternity by a preponderance of the evidence, usually after genetic testing.
How long do I have to establish paternity in Pennsylvania?
Pennsylvania sets a firm deadline. Under 23 Pa.C.S. 4343(b), an action to establish the paternity of a child born out of wedlock must be commenced within 18 years of the child's date of birth. Missing that window can forfeit the right to have paternity determined in court.
What is the marital presumption of paternity in Pennsylvania?
A child born to a married woman is presumed to be a child of the marriage, one of the strongest presumptions in family law. It can be overcome where genetic testing shows the husband is not the father (23 Pa.C.S. 5104(g)) or by clear and convincing evidence of non-access or sterility.
What genetic-testing result establishes paternity in Pennsylvania?
Under 23 Pa.C.S. 4343(c)(2), genetic test results showing a 99 percent or greater probability that the alleged father is the father create a presumption of paternity. That presumption can be rebutted only by clear and convincing evidence that the test results are not reliable in the particular case.
Pennsylvania paternity law at a glance
Pennsylvania lets unmarried parents establish paternity without court by signing an Acknowledgment of Paternity, which under 23 Pa.C.S. 5103 carries the effect of a court order once filed and lets the father be added to the birth certificate. Either signer has 60 days to rescind, after which it can be challenged only for fraud, duress, or material mistake. The state's defining feature is a clear statutory deadline for court actions: paternity of a child born out of wedlock must be established within 18 years of birth (23 Pa.C.S. 4343(b)). The marital presumption that a husband fathers his wife's child is strong but can be defeated by genetic testing under 23 Pa.C.S. 5104(g), and in contested cases a 99 percent genetic-test probability creates a presumption of paternity (23 Pa.C.S. 4343(c)(2)).
Establishing Pennsylvania paternity for a child born to unmarried parents
Consider a child born in Pennsylvania to unmarried parents who agree on the father. At the hospital both sign an Acknowledgment of Paternity, which once filed has the same effect as a court order under 23 Pa.C.S. 5103. If one parent has second thoughts, either may rescind within 60 days (42 U.S.C. 666(a)(5)); after that it stands unless fraud, duress, or a material mistake is proven. Had the parents disputed paternity, either could ask the county Domestic Relations Section to order genetic testing, where a 99 percent probability creates a presumption of paternity (23 Pa.C.S. 4343(c)(2)); such a court action must be commenced within 18 years of the child's birth (23 Pa.C.S. 4343(b)). Had the child been born during the mother's marriage, the husband would be presumed the father unless genetic testing showed otherwise (23 Pa.C.S. 5104(g)). Attorney review is available through DocDraft.
Relevant Laws
23 Pa.C.S. 4343(b) (18-year limit to establish paternity)
Provides that an action or proceeding to establish the paternity of a child born out of wedlock must be commenced within 18 years of the child's date of birth.
23 Pa.C.S. 4343(c)(2) (99 percent genetic-testing presumption)
Provides that genetic test results indicating a 99 percent or greater probability that the alleged father is the father create a presumption of paternity, rebuttable only by clear and convincing evidence that the results are not reliable in that particular case.
23 Pa.C.S. 5103 (Acknowledgment of Paternity)
Provides that an Acknowledgment of Paternity signed by the parents of a child born out of wedlock, once filed, has the same effect as an order of the court establishing paternity and allows the father to be named on the birth certificate.
23 Pa.C.S. 5104(g) (overcoming the presumption of legitimacy)
Provides that the presumption that a child born to a married woman is a child of the marriage is overcome where genetic testing establishes that the husband is not the father of the child.
42 U.S.C. 666(a)(5) (federal 60-day rescission of an acknowledgment)
Federal law requires states to give a signer at least 60 days to rescind a voluntary acknowledgment of paternity, after which it may be challenged only on the basis of fraud, duress, or material mistake of fact.
Pennsylvania Department of Human Services, Bureau of Child Support Enforcement
The Bureau of Child Support Enforcement administers paternity establishment and child support, working with county Domestic Relations Sections; unmarried parents can obtain and file the Acknowledgment of Paternity through hospitals or local Domestic Relations offices.
Regional Variances
Pennsylvania paternity rules at a glance
Voluntary path and form
Unmarried parents establish paternity by signing an Acknowledgment of Paternity, which under 23 Pa.C.S. 5103 has the effect of a court order once filed and lets the father be added to the birth certificate.
Rescission window
Either signer may rescind an Acknowledgment of Paternity within 60 days under federal law (42 U.S.C. 666(a)(5)); after that it can be challenged only for fraud, duress, or material mistake.
Marital presumption
A child born to a married woman is presumed a child of the marriage, a strong presumption overcome where genetic testing shows the husband is not the father (23 Pa.C.S. 5104(g)).
Deadline to establish
A court action to establish the paternity of a child born out of wedlock must be commenced within 18 years of the child's birth (23 Pa.C.S. 4343(b)).
Genetic-testing threshold
Genetic test results showing a 99 percent or greater probability create a presumption of paternity, rebuttable only by clear and convincing evidence that the results are unreliable (23 Pa.C.S. 4343(c)(2)).
Who administers it
The Department of Human Services Bureau of Child Support Enforcement works with the county Domestic Relations Sections of the Courts of Common Pleas to establish paternity and support.
Suggested Compliance Checklist
Confirm whether a marital presumption applies
Before signing or filing anything days after startingDetermine whether the mother was married when the child was born, which triggers Pennsylvania's presumption that the husband is the father. That presumption can be overcome where genetic testing shows the husband is not the father (23 Pa.C.S. 5104(g)).
Get genetic testing if biological parentage is uncertain
Before signing an acknowledgment days after startingBecause a signed acknowledgment has the force of a court order, obtain genetic testing first if there is any doubt. Under 23 Pa.C.S. 4343(c)(2), results of a 99 percent or greater probability create a presumption of paternity.
Sign and file the Acknowledgment of Paternity
At the hospital or a Domestic Relations office days after startingUnmarried parents who agree sign the Acknowledgment of Paternity, which once filed has the effect of a court order under 23 Pa.C.S. 5103. Keep a copy. Attorney review of your paternity matter is available through DocDraft.
Track the 60-day rescission window
Within 60 days of signing days after startingIf you need to cancel a signed acknowledgment, rescind it within 60 days under federal law (42 U.S.C. 666(a)(5)). After that it can be challenged only for fraud, duress, or a material mistake of fact.
File a paternity action before the child turns 18 if parents disagree
Within 18 years of the child's birth days after startingIf parents do not agree, file to establish paternity in the county Domestic Relations Section, which can order genetic testing. Under 23 Pa.C.S. 4343(b) the action must be commenced within 18 years of the child's birth.
Keep records of the acknowledgment, testing, and orders
Ongoing days after startingSave copies of the signed acknowledgment, any genetic-test results, and court papers, and calendar the 60-day rescission window and the 18-year deadline to bring a court action (23 Pa.C.S. 4343(b)) so you do not miss a right-forfeiting date.
| Task | Description | Document | Days after starting |
|---|---|---|---|
| Confirm whether a marital presumption applies | Determine whether the mother was married when the child was born, which triggers Pennsylvania's presumption that the husband is the father. That presumption can be overcome where genetic testing shows the husband is not the father (23 Pa.C.S. 5104(g)). | - | Before signing or filing anything |
| Get genetic testing if biological parentage is uncertain | Because a signed acknowledgment has the force of a court order, obtain genetic testing first if there is any doubt. Under 23 Pa.C.S. 4343(c)(2), results of a 99 percent or greater probability create a presumption of paternity. | - | Before signing an acknowledgment |
| Sign and file the Acknowledgment of Paternity | Unmarried parents who agree sign the Acknowledgment of Paternity, which once filed has the effect of a court order under 23 Pa.C.S. 5103. Keep a copy. Attorney review of your paternity matter is available through DocDraft. | - | At the hospital or a Domestic Relations office |
| Track the 60-day rescission window | If you need to cancel a signed acknowledgment, rescind it within 60 days under federal law (42 U.S.C. 666(a)(5)). After that it can be challenged only for fraud, duress, or a material mistake of fact. | - | Within 60 days of signing |
| File a paternity action before the child turns 18 if parents disagree | If parents do not agree, file to establish paternity in the county Domestic Relations Section, which can order genetic testing. Under 23 Pa.C.S. 4343(b) the action must be commenced within 18 years of the child's birth. | - | Within 18 years of the child's birth |
| Keep records of the acknowledgment, testing, and orders | Save copies of the signed acknowledgment, any genetic-test results, and court papers, and calendar the 60-day rescission window and the 18-year deadline to bring a court action (23 Pa.C.S. 4343(b)) so you do not miss a right-forfeiting date. | - | Ongoing |
Frequently Asked Questions
Establishing paternity in Pennsylvania means legally identifying a child's father so the child can receive support, custody and visitation, health coverage, inheritance, and benefits. It can be done by signing an Acknowledgment of Paternity (23 Pa.C.S. 5103) or through a court action in the county Domestic Relations Section that determines the parent-child relationship.
Unmarried parents who agree can sign an Acknowledgment of Paternity, which under 23 Pa.C.S. 5103 has the effect of a court order once filed. If they disagree, either parent can ask the county Domestic Relations Section to determine paternity by a preponderance of the evidence, and the court can order genetic testing.
It is a form unmarried parents sign to establish a legal father-child relationship without going to court. Under 23 Pa.C.S. 5103, a filed Acknowledgment of Paternity has the same effect as a court order and lets the father be added to the birth certificate, with the rights and duties of a parent.
A child born to a married woman is presumed a child of the marriage. That presumption can be overcome where genetic testing shows the husband is not the father (23 Pa.C.S. 5104(g)), or by clear and convincing evidence of non-access or sterility. Whether a challenge succeeds can also turn on the best interests of the child.
Yes. Under 23 Pa.C.S. 4343(b), an action to establish the paternity of a child born out of wedlock must be commenced within 18 years of the child's date of birth. There is also a 60-day window to rescind a signed Acknowledgment of Paternity (42 U.S.C. 666(a)(5)).
Yes, within a limited window. Either signer may rescind an Acknowledgment of Paternity within 60 days of signing under federal law (42 U.S.C. 666(a)(5)). After 60 days it can be challenged only on the grounds of fraud, duress, or a material mistake of fact, and a later genetic test alone may not be enough.
Under 23 Pa.C.S. 4343(c)(2), genetic test results indicating a 99 percent or greater probability that the alleged father is the father create a presumption of paternity. That presumption can be rebutted only by clear and convincing evidence that the genetic test results are not reliable in that particular case.
The Pennsylvania Department of Human Services, through its Bureau of Child Support Enforcement, administers paternity and support services, working with the county Domestic Relations Sections of the Courts of Common Pleas. Hospitals and local Domestic Relations offices provide the Acknowledgment of Paternity form and can help parents establish paternity.
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