How to Establish Paternity in Kansas
Reviewed by DocDraft Legal Team · Kansas · Last updated 2026-09-12
In Kansas, establishing paternity means legally identifying a child's father so the child gains rights to support, custody and parenting time, health coverage, inheritance, and benefits. There are two main paths. Unmarried parents who agree can sign a voluntary acknowledgment of paternity, filed with the Office of Vital Statistics so the father can be added to the birth certificate. When parents do not agree, a court decides parentage under the Kansas Parentage Act (K.S.A. chapter 23, article 22). Kansas timing rules are load-bearing and depend on whether a presumed father exists. An action to determine a father-child relationship that is presumed under K.S.A. 23-2208 may be brought at any time, but an action where there is no presumed father may be brought at any time until three years after the child reaches the age of majority, which is 18 in Kansas (K.S.A. 23-2209). A man married to the mother is presumed the father if the child is born during the marriage or within 300 days after it ends, and a genetic test showing a 97 percent or greater probability also creates a presumption; a presumption may be rebutted only by clear and convincing evidence or a court decree naming another man (K.S.A. 23-2208). Attorney review of your situation is available through DocDraft.
Find out where you stand in Kansas
Where are you in establishing paternity?
DocDraft provides document preparation, not legal advice.
How is paternity established in Kansas?
There are two routes. Unmarried parents who agree can sign a voluntary acknowledgment of paternity, filed with the Office of Vital Statistics to add the father to the birth certificate. If parents disagree, a court decides parentage under the Kansas Parentage Act (K.S.A. chapter 23, article 22), often after ordering genetic testing.
How long do I have to establish paternity in Kansas?
It depends on whether a presumed father exists. An action to determine a presumed father-child relationship may be brought at any time, while an action where there is no presumed father may be brought at any time until three years after the child reaches the age of majority, which is 18 in Kansas (K.S.A. 23-2209).
What is the marital presumption of paternity in Kansas?
Under K.S.A. 23-2208, a man is presumed to be the father if he and the mother are or have been married and the child is born during the marriage or within 300 days after it is terminated by death, annulment, or divorce. The presumption may be rebutted only by clear and convincing evidence or a court decree naming another man.
What genetic-testing result establishes paternity in Kansas?
Under K.S.A. 23-2208, a man is presumed to be the father if genetic test results indicate a probability of 97 percent or greater that he is the father of the child. A court can order genetic testing when parentage is disputed and then adjudicate the parent-child relationship.
Kansas paternity law at a glance
Kansas lets unmarried parents establish paternity without court by signing a voluntary acknowledgment of paternity, filed with the Office of Vital Statistics. When parentage is disputed, the Kansas Parentage Act governs (K.S.A. chapter 23, article 22). An action to determine a father-child relationship that is presumed under K.S.A. 23-2208 may be brought at any time, but an action where there is no presumed father may be brought at any time until three years after the child reaches the age of majority, which is 18 in Kansas (K.S.A. 23-2209). A man married to the mother is presumed the father when the child is born during the marriage or within 300 days after it ends, and genetic test results of 97 percent or greater also create a presumption (K.S.A. 23-2208). A presumption may be rebutted only by clear and convincing evidence or a court decree establishing paternity in another man.
Establishing Kansas paternity when parents are unmarried
Suppose a child is born in Kansas to unmarried parents who agree on the father. At the hospital both sign a voluntary acknowledgment of paternity, filed with the Office of Vital Statistics. Either parent can still rescind within the federal 60-day window. If the parents disputed parentage, either could file a parentage action, and because no presumed father exists the action could be brought at any time until three years after the child reaches the age of majority, which is 18 in Kansas (K.S.A. 23-2209). The court could order genetic testing, where a result of 97 percent or greater creates a presumption of paternity (K.S.A. 23-2208). Had the mother been married when the child was born, her husband would be a presumed father, rebuttable only by clear and convincing evidence or a decree naming another man (K.S.A. 23-2208). Attorney review is available through DocDraft.
Relevant Laws
K.S.A. 23-2208 (presumptions of paternity)
Provides that a man is presumed to be a child's father if he and the mother are or have been married and the child is born during the marriage or within 300 days after it ends, or if genetic test results indicate a probability of 97 percent or greater. A presumption may be rebutted only by clear and convincing evidence or a court decree establishing paternity in another man.
K.S.A. 23-2209 (time to bring a parentage action)
Provides that an action to determine a father-child relationship presumed under K.S.A. 23-2208 may be brought at any time, and that an action where there is no presumed father may be brought at any time until three years after the child reaches the age of majority.
Kansas Parentage Act (K.S.A. chapter 23, article 22)
The Kansas Parentage Act governs how a parent-child relationship is presumed, established, and adjudicated, including who may bring an action and the role of genetic testing.
Kansas Department for Children and Families, Child Support Services
The Kansas Department for Children and Families administers child support services and can help unmarried parents establish paternity and pursue support.
Regional Variances
Kansas paternity rules at a glance
Voluntary path and filing
Unmarried parents establish paternity by signing a voluntary acknowledgment of paternity, filed with the Office of Vital Statistics so the father can be added to the birth certificate.
Rescission window
The federal 60-day rescission window applies to a signed acknowledgment before it becomes final; after that it can be challenged only for fraud, duress, or material mistake of fact.
Marital presumption
A man is presumed the father if he and the mother are or have been married and the child is born during the marriage or within 300 days after it ends (K.S.A. 23-2208), rebuttable only by clear and convincing evidence or a decree naming another man.
Deadline to establish
With a presumed father, an action may be brought at any time; with no presumed father, until three years after the child reaches the age of majority, which is 18 in Kansas (K.S.A. 23-2209).
Genetic-testing threshold
Genetic test results indicating a probability of 97 percent or greater that the man is the father create a presumption of paternity (K.S.A. 23-2208).
Who administers it
The Kansas Department for Children and Families administers child support and paternity establishment; disputed parentage is decided by a court under the Kansas Parentage Act, which may order genetic testing.
Suggested Compliance Checklist
Confirm whether a presumed father exists
Before signing or filing anything days after startingDetermine whether the mother was married when the child was born or within 300 days before the birth, which makes her husband a presumed father (K.S.A. 23-2208). This changes the deadline: with a presumed father an action may be brought at any time (K.S.A. 23-2209).
Get genetic testing if biological parentage is uncertain
Before signing an acknowledgment days after startingBecause an acknowledgment carries the duties of parentage, obtain genetic testing first if there is any doubt. Under K.S.A. 23-2208, results indicating a probability of 97 percent or greater that the man is the father create a presumption of paternity.
Sign and file the voluntary acknowledgment of paternity
At the hospital or through Vital Statistics days after startingUnmarried parents who agree sign a voluntary acknowledgment of paternity, filed with the Office of Vital Statistics so the father is added to the birth certificate. Keep a copy. Attorney review of your paternity matter is available through DocDraft.
Track the federal 60-day rescission window
Within 60 days of signing days after startingIf you need to cancel a signed acknowledgment, do so within the federal 60-day rescission window. After that, it can be challenged only for fraud, duress, or material mistake of fact, so act promptly if you have doubts.
File a parentage action if parents disagree
See the presumed-father rule for timing days after startingIf parents do not agree, file a parentage action under the Kansas Parentage Act. With no presumed father, bring it at any time until three years after the child reaches the age of majority (K.S.A. 23-2209). The court can order genetic testing and adjudicate parentage.
Keep records of the acknowledgment, testing, and orders
Ongoing days after startingSave copies of the acknowledgment, any genetic-test results, and court papers, and calendar the three-years-after-majority window where no presumed father exists (K.S.A. 23-2209) and the federal 60-day rescission window so you do not miss a right-forfeiting date.
| Task | Description | Document | Days after starting |
|---|---|---|---|
| Confirm whether a presumed father exists | Determine whether the mother was married when the child was born or within 300 days before the birth, which makes her husband a presumed father (K.S.A. 23-2208). This changes the deadline: with a presumed father an action may be brought at any time (K.S.A. 23-2209). | - | Before signing or filing anything |
| Get genetic testing if biological parentage is uncertain | Because an acknowledgment carries the duties of parentage, obtain genetic testing first if there is any doubt. Under K.S.A. 23-2208, results indicating a probability of 97 percent or greater that the man is the father create a presumption of paternity. | - | Before signing an acknowledgment |
| Sign and file the voluntary acknowledgment of paternity | Unmarried parents who agree sign a voluntary acknowledgment of paternity, filed with the Office of Vital Statistics so the father is added to the birth certificate. Keep a copy. Attorney review of your paternity matter is available through DocDraft. | - | At the hospital or through Vital Statistics |
| Track the federal 60-day rescission window | If you need to cancel a signed acknowledgment, do so within the federal 60-day rescission window. After that, it can be challenged only for fraud, duress, or material mistake of fact, so act promptly if you have doubts. | - | Within 60 days of signing |
| File a parentage action if parents disagree | If parents do not agree, file a parentage action under the Kansas Parentage Act. With no presumed father, bring it at any time until three years after the child reaches the age of majority (K.S.A. 23-2209). The court can order genetic testing and adjudicate parentage. | - | See the presumed-father rule for timing |
| Keep records of the acknowledgment, testing, and orders | Save copies of the acknowledgment, any genetic-test results, and court papers, and calendar the three-years-after-majority window where no presumed father exists (K.S.A. 23-2209) and the federal 60-day rescission window so you do not miss a right-forfeiting date. | - | Ongoing |
Frequently Asked Questions
Establishing paternity in Kansas means legally identifying a child's father so the child can receive support, custody and parenting time, health coverage, inheritance, and benefits. It can be done by signing a voluntary acknowledgment of paternity or through a parentage action under the Kansas Parentage Act (K.S.A. chapter 23, article 22).
Unmarried parents who agree can sign a voluntary acknowledgment of paternity and file it with the Office of Vital Statistics so the father is added to the birth certificate. If parents disagree, a court determines parentage under the Kansas Parentage Act, often after ordering genetic testing (K.S.A. 23-2208, 23-2209).
It is a form that unmarried parents sign to establish a legal father-child relationship without going to court. Once filed with the Office of Vital Statistics, the father can be added to the child's birth certificate. The federal 60-day rescission window applies before the acknowledgment becomes final.
A presumption under K.S.A. 23-2208 may be rebutted only by clear and convincing evidence or by a court decree establishing paternity of the child in another man. An action to determine a presumed father-child relationship itself may be brought at any time under K.S.A. 23-2209, so the presumption can be tested in that proceeding.
It depends on a presumed father. Where a presumed father exists, an action may be brought at any time. Where there is no presumed father, an action may be brought at any time until three years after the child reaches the age of majority, which is 18 in Kansas (K.S.A. 23-2209).
Under K.S.A. 23-2208, genetic test results indicating a probability of 97 percent or greater that the man is the father of the child create a presumption of paternity. A court can order genetic testing when parentage is disputed before adjudicating the parent-child relationship.
The Kansas Department for Children and Families administers child support services and can help establish paternity and support. The voluntary acknowledgment is filed with the Office of Vital Statistics. When parentage is disputed, a court decides it under the Kansas Parentage Act and can order genetic testing (K.S.A. 23-2208, 23-2209).
Yes, in many cases. Where there is no presumed father, an action to determine the father-child relationship may be brought at any time until three years after the child reaches the age of majority, which is 18 in Kansas (K.S.A. 23-2209). That extends the window beyond the child's 18th birthday.
Other Kansas guides
Ready to Draft Your Document?
Get AI-powered legal documents with attorney review included. Plans start at $39.99/mo.