How to Establish Paternity in Missouri
Reviewed by DocDraft Legal Team · Missouri · Last updated 2026-09-12
In Missouri, establishing paternity means legally identifying a child's father so the child gains rights to support, custody and visitation, health coverage, inheritance, and benefits. The area is governed by the Uniform Parentage Act in Chapter 210. Unmarried parents who agree can sign an Affidavit Acknowledging Paternity, establishing legal parentage without court. When parents do not agree, an action under the Uniform Parentage Act decides the question. Missouri's load-bearing timing rule is open-ended: an action to declare the existence or nonexistence of the father-child relationship presumed under the marital presumption may be brought at any time (Mo. Rev. Stat. 210.826). A man is presumed to be the natural father when the child is born during his marriage to the mother or within 300 days after the marriage ends, and that presumption may be rebutted only by clear and convincing evidence, or by a court decree establishing another man as the father (Mo. Rev. Stat. 210.822). Genetic testing is powerful: a blood test showing a probability of paternity of 98 percent or higher, using a prior probability of 0.5, creates a presumption of paternity (Mo. Rev. Stat. 210.822). Under federal law, either parent may rescind a signed affidavit within 60 days. Attorney review of your situation is available through DocDraft.
Find out where you stand in Missouri
Where are you in establishing paternity?
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What are my options for establishing paternity in Missouri?
There are two routes. Unmarried parents who agree can sign an Affidavit Acknowledging Paternity, establishing legal parentage without court. If parents disagree, an action under the Uniform Parentage Act is filed and the court can order genetic testing before deciding parentage (Mo. Rev. Stat. 210.826).
How long do I have to establish paternity in Missouri?
Missouri sets an open-ended window for the marital presumption. An action to declare the existence or nonexistence of the father-child relationship presumed under section 210.822 may be brought at any time (Mo. Rev. Stat. 210.826). The statute names the child, the mother, a presumed or alleged father, and the family support division among those who may bring it.
What is the marital presumption of paternity in Missouri?
Under Mo. Rev. Stat. 210.822, a man is presumed to be the natural father if the child is born during his marriage to the mother or within 300 days after the marriage ends. The presumption may be rebutted only by clear and convincing evidence, or by a court decree establishing another man as the father.
What genetic-testing result establishes paternity in Missouri?
Under Mo. Rev. Stat. 210.822, if a blood test shows that the alleged parent is not excluded and the probability of paternity is 98 percent or higher, using a prior probability of 0.5, the man is presumed to be the natural father of the child.
Missouri paternity law at a glance
Missouri places paternity under the Uniform Parentage Act in Chapter 210. Unmarried parents who agree can establish legal parentage without a hearing by signing an Affidavit Acknowledging Paternity. What sets Missouri apart is timing: an action to declare the existence or nonexistence of the presumed father-child relationship may be brought at any time (Mo. Rev. Stat. 210.826). A man is presumed to be the natural father when the child is born during his marriage to the mother or within 300 days after the marriage ends, and that presumption may be rebutted only by clear and convincing evidence, or by a court decree establishing another man as the father (Mo. Rev. Stat. 210.822). Genetic testing is decisive: a blood test showing a probability of paternity of 98 percent or higher, using a prior probability of 0.5, creates a presumption of paternity (Mo. Rev. Stat. 210.822).
Establishing Missouri paternity for a child born to unmarried parents
Suppose a child is born in Missouri to unmarried parents who agree on the father. At the hospital both sign an Affidavit Acknowledging Paternity, establishing legal parentage without court. Weeks later one parent has second thoughts and can still rescind within 60 days of signing under the federal rule that applies in Missouri. Had the parents disputed parentage instead, either could file an action under the Uniform Parentage Act, which for the marital presumption may be brought at any time (Mo. Rev. Stat. 210.826). The court could order genetic testing, where a blood test showing a probability of paternity of 98 percent or higher creates a presumption of paternity (Mo. Rev. Stat. 210.822). Had the child been born during a marriage, the husband's presumed paternity would yield only to clear and convincing evidence or a court decree naming another man (Mo. Rev. Stat. 210.822). Attorney review is available through DocDraft.
Relevant Laws
Mo. Rev. Stat. 210.826 (who may bring an action and when)
Provides that a child, the natural mother, a presumed father, a man alleging himself to be the father, a custodian, or the family support division may bring an action at any time to declare the existence or nonexistence of the father-child relationship presumed under subsection 1 of section 210.822.
Mo. Rev. Stat. 210.822 (presumption of paternity; rebuttal; 98 percent threshold)
Provides that a man is presumed the natural father if the child is born during the marriage or within 300 days after it ends, that a blood test showing a probability of paternity of 98 percent or higher using a prior probability of 0.5 creates a presumption of paternity, and that the presumption may be rebutted only by clear and convincing evidence or a court decree establishing another man as the father.
42 U.S.C. 666(a)(5) and 45 CFR 303.5 (federal voluntary acknowledgment and 60-day rescission)
Federal law requires every state child-support program to offer a voluntary acknowledgment of paternity, lets either signer rescind within 60 days, and provides that after 60 days it may be challenged only on the basis of fraud, duress, or material mistake of fact. This rule is uniform nationwide and applies in Missouri.
Missouri Department of Social Services, Family Support Division
The Family Support Division helps parents establish paternity and support, can arrange genetic testing, and works with the Bureau of Vital Records on the Affidavit Acknowledging Paternity.
Regional Variances
Missouri paternity rules at a glance
Voluntary path and form
Unmarried parents establish legal parentage by signing the Affidavit Acknowledging Paternity, available through the Bureau of Vital Records and the Family Support Division, usually at the hospital or later through the agency.
Rescission window
Under the federal rule that applies in Missouri, either parent may rescind within 60 days of signing; after 60 days the affidavit can be challenged only for fraud, duress, or material mistake of fact.
Deadline to establish
An action to declare the existence or nonexistence of the father-child relationship presumed under section 210.822 may be brought at any time (Mo. Rev. Stat. 210.826).
Marital presumption and rebuttal
A child born during a marriage or within 300 days after it ends is presumed the husband's; the presumption yields only to clear and convincing evidence or a court decree naming another man (Mo. Rev. Stat. 210.822).
Genetic-testing threshold
A blood test showing a probability of paternity of 98 percent or higher, using a prior probability of 0.5, creates a presumption of paternity (Mo. Rev. Stat. 210.822).
Who administers it
The Missouri Department of Social Services Family Support Division helps establish parentage and support and can arrange genetic testing; disputed parentage is decided by the court.
Suggested Compliance Checklist
Confirm whether a marital presumption applies
Before signing or filing anything days after startingDetermine whether the child was born during a marriage or within 300 days after it ended, which makes the husband a presumed natural father whose presumption yields only to clear and convincing evidence or a court decree naming another man (Mo. Rev. Stat. 210.822).
Get genetic testing if biological parentage is uncertain
Before signing an affidavit days after startingBecause a signed affidavit has lasting legal effect, obtain genetic testing first if there is any doubt. Under Mo. Rev. Stat. 210.822, a blood test showing a probability of paternity of 98 percent or higher, using a prior probability of 0.5, creates a presumption of paternity.
Sign and file the Affidavit Acknowledging Paternity
At the hospital or a local office days after startingUnmarried parents who agree sign the Affidavit Acknowledging Paternity, available through the Bureau of Vital Records and the Family Support Division, establishing legal parentage. 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 affidavit, rescind within 60 days of signing under the federal rule that applies in Missouri. After 60 days it can be challenged only on the basis of fraud, duress, or a material mistake of fact.
File an action under the Uniform Parentage Act if parents disagree
Any time a dispute arises days after startingIf parents do not agree, file an action to determine the father-child relationship, which for the marital presumption may be brought at any time (Mo. Rev. Stat. 210.826). The court can order genetic testing and enter a judgment of paternity.
Keep records of the affidavit, testing, and orders
Ongoing days after startingSave copies of the signed affidavit, genetic-test results, and court papers, and calendar the federal 60-day rescission window and any deadline to challenge an existing judgment so you do not miss a right-forfeiting date.
| Task | Description | Document | Days after starting |
|---|---|---|---|
| Confirm whether a marital presumption applies | Determine whether the child was born during a marriage or within 300 days after it ended, which makes the husband a presumed natural father whose presumption yields only to clear and convincing evidence or a court decree naming another man (Mo. Rev. Stat. 210.822). | - | Before signing or filing anything |
| Get genetic testing if biological parentage is uncertain | Because a signed affidavit has lasting legal effect, obtain genetic testing first if there is any doubt. Under Mo. Rev. Stat. 210.822, a blood test showing a probability of paternity of 98 percent or higher, using a prior probability of 0.5, creates a presumption of paternity. | - | Before signing an affidavit |
| Sign and file the Affidavit Acknowledging Paternity | Unmarried parents who agree sign the Affidavit Acknowledging Paternity, available through the Bureau of Vital Records and the Family Support Division, establishing legal parentage. Keep a copy. Attorney review of your paternity matter is available through DocDraft. | - | At the hospital or a local office |
| Track the federal 60-day rescission window | If you need to cancel a signed affidavit, rescind within 60 days of signing under the federal rule that applies in Missouri. After 60 days it can be challenged only on the basis of fraud, duress, or a material mistake of fact. | - | Within 60 days of signing |
| File an action under the Uniform Parentage Act if parents disagree | If parents do not agree, file an action to determine the father-child relationship, which for the marital presumption may be brought at any time (Mo. Rev. Stat. 210.826). The court can order genetic testing and enter a judgment of paternity. | - | Any time a dispute arises |
| Keep records of the affidavit, testing, and orders | Save copies of the signed affidavit, genetic-test results, and court papers, and calendar the federal 60-day rescission window and any deadline to challenge an existing judgment so you do not miss a right-forfeiting date. | - | Ongoing |
Frequently Asked Questions
Establishing paternity in Missouri 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 Affidavit Acknowledging Paternity or through an action under the Uniform Parentage Act (Mo. Rev. Stat. 210.826).
Unmarried parents who agree can sign an Affidavit Acknowledging Paternity, establishing legal parentage without court. If parents disagree, an action under the Uniform Parentage Act is filed, and the court can order genetic testing before deciding parentage (Mo. Rev. Stat. 210.826).
It is a form unmarried parents sign to establish a legal father-child relationship without going to court, available through the Bureau of Vital Records and the Family Support Division. Once signed and filed it makes the father a legal parent with support, custody, and inheritance consequences for the child.
For the marital presumption, no. An action to declare the existence or nonexistence of the father-child relationship presumed under section 210.822 may be brought at any time (Mo. Rev. Stat. 210.826). Separate deadlines can apply to challenging an existing judgment of paternity.
Yes, within a limited window. Under the federal rule that applies in Missouri, either parent may rescind a signed Affidavit Acknowledging Paternity within 60 days of signing. After 60 days it can be challenged only on the basis of fraud, duress, or a material mistake of fact.
Under Mo. Rev. Stat. 210.822, if a blood test shows that the alleged parent is not excluded and the probability of paternity is 98 percent or higher, using a prior probability of 0.5, the man is presumed to be the natural father of the child.
Under Mo. Rev. Stat. 210.822, a man is presumed the natural father if the child is born during his marriage to the mother or within 300 days after it ends. The presumption may be rebutted only by clear and convincing evidence, or by a court decree establishing another man as the father.
The Missouri Department of Social Services Family Support Division helps establish paternity and support and can arrange genetic testing, while the Bureau of Vital Records handles the acknowledgment form. When parentage is disputed, the court decides it and can order genetic testing (Mo. Rev. Stat. 210.822).
Other Missouri guides
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