DNA Says You’re the Father: What Happens Next in Missouri?

A positive DNA test does not make you a legal father in Missouri. Until paternity has been formally established, you do not have custody or parental rights that a court will enforce. Financial obligations, on the other hand, can extend back years.

Whether you just learned that you’re going to be a father or if you’re the parent who requested the test, here are some things to consider.

A Test Result Is Evidence, Not a Legal Finding

Missouri’s Family Support Division is clear about this: genetic testing alone does not establish legal paternity. Parents must sign an Affidavit Acknowledging Paternity, or the court or agency must issue an order.

The test still carries real weight. Under RSMo § 210.822, a man is presumed to be the father when an expert concludes that the test shows a paternity probability of 98% or higher. This presumption depends on a reliable laboratory test with a documented chain of custody. A drugstore kit swabbed on the kitchen table may provide an answer to a personal question, but it usually won’t stand up in court.

Three Ways to Make Paternity Official

Missouri offers three options for establishing paternity. The choice depends mainly on the agreement of the parents.

• Affidavit Acknowledging Paternity: Both parents sign this document, and once it is filed, it has the same weight as a court order. Either parent can withdraw their signature within 60 days. After this period, the document can only be challenged based on fraud, duress, or material factual error.
• Administrative Order through the Family Support Division: This option is common when a parent seeks child support services. The agency can arrange genetic testing for free.
• Paternity Case in Circuit Court: If there is a dispute about custody or parenting time, this route is necessary. For families in Columbia, this typically means Boone County court.

One complication: if the mother is married to someone else at the time of the child’s birth, her husband will be presumed to be the father. This presumption needs to be resolved in court before anyone else can claim the role of father.

What Changes Once You’re the Legal Father

Establishing paternity simultaneously creates rights and responsibilities.

Child Support

Missouri calculates support with Form 14. The Supreme Court of Missouri has adopted a new Form 14, effective January 1, 2026. It has an updated schedule for support obligations. So, estimates based on older worksheets may not be accurate. A parent who covers the child’s expenses alone can also seek reimbursement. However, RSMo § 210.828 limits the look-back period to five years before the case was filed.

Custody and Parenting Time

Courts decide custody in paternity cases using the same best interest standard used in divorce. Since August 28, 2023, RSMo § 452.375 started with a rebuttable presumption that equal or approximately equal parenting time serves the child’s best interests. This presumption can be overcome, but a father who has never met their toddler should not expect a 50/50 schedule on day one. Courts may phase in time gradually.

Everything Else

Legal paternity can put the father’s name on the birth certificate, giving the child inheritance rights and opening access to benefits such as health insurance, social security, or veterans’ benefits through the father.

If You Doubt the Result, Act Before Judgment

Have a real reason to question the test? Ask for a court-ordered retest through an accredited lab before paternity is established. Missouri allows a paternity judgment to be set aside based on new genetic evidence, but the deadlines are strict and the process is narrow.

Protect Your Relationship With Your Child

A DNA test answers one question and raises several others. Support, custody, the parenting plan, and the birth certificate – each need to be handled carefully, and mistakes made in the early stages tend to follow the family for years.

Columbia Family Law Group LLC represents mothers and fathers in paternity cases throughout the Columbia area. If you have any test results or court or agency paperwork, please contact our office to schedule a consultation so we can help you understand your situation and advise you on what to do next.