Under South Dakota law, an unmarried mother automatically holds sole legal and physical custody of her child until the father establishes paternity through court proceedings or a voluntary acknowledgment under SDCL 25-5-10. Once paternity is legally established, unmarried fathers gain equal rights to petition for custody and parenting time, with courts applying the same best interest standard used in divorce cases. The filing fee for a paternity action is approximately $70, and South Dakota has no minimum residency requirement for family law matters.
Key Facts: Custody for Unmarried Parents in South Dakota
| Category | Details |
|---|---|
| Paternity Filing Fee | $70 (as of January 2026, verify with local clerk) |
| Divorce/Custody Filing Fee | $95-$120 depending on county |
| Residency Requirement | None (must be resident at time of filing) |
| Waiting Period | 60 days from filing to final order |
| Parenting Course | Required within 60 days (SMILE Program, $20) |
| Initial Custody Presumption | Mother has sole custody until paternity established |
| Custody Standard | Best interest of the child (SDCL 25-4-45) |
| Joint Custody Available | Yes, legal and/or physical (SDCL 25-5-7.1) |
How Paternity Affects Custody Rights in South Dakota
Unmarried fathers in South Dakota have zero custodial rights until paternity is legally established through one of four recognized methods. Under SDCL 25-5-10, the mother of a child born out of wedlock is entitled to sole custody until the father takes affirmative legal action. This statute creates a critical distinction: having your name on the birth certificate does not establish paternity in South Dakota. The Department of Social Services confirms that paternity must be established by: (1) a court order adjudicating paternity, (2) genetic testing, (3) signing a Voluntary Acknowledgment of Paternity, or (4) the child being born during marriage or within 10 months after dissolution of marriage.
The practical impact of this legal framework means unmarried fathers must act proactively. Without established paternity, a father cannot file for custody or visitation, cannot be awarded child support from the mother, and has no legal standing in decisions about the child's education, healthcare, or religious upbringing. According to case law interpreting SDCL 25-5-10.1, while the mother is initially entitled to custody, this does not create a presumption that maternal custody serves the child's best interests. Once paternity is established, courts evaluate both parents equally under the best interest standard.
Methods to Establish Paternity in South Dakota
South Dakota provides both voluntary and involuntary pathways to establish paternity, with costs ranging from $0 for voluntary acknowledgment to $500 or more for contested court proceedings requiring DNA testing. The South Dakota Department of Health maintains all paternity records in sealed files accessible only by court order.
Voluntary Acknowledgment of Paternity
The simplest and most cost-effective method requires both parents to sign a paternity affidavit under oath before a notary public. This form is available at hospitals during the child's birth or through the South Dakota Department of Social Services. Once filed with the Department of Health, the acknowledgment creates a legal presumption of paternity with the same effect as a court order. Parents should retain copies before submission because the original becomes part of a sealed, confidential file. A new birth certificate reflecting the father's information costs $15.00 per certified copy.
Court-Ordered Paternity Through DNA Testing
When parents disagree about biological parentage, either parent or the Department of Social Services can petition the circuit court for genetic testing under SDCL 25-8. Court-ordered DNA tests must comply with strict chain-of-custody protocols to be admissible, including identity verification of all parties, documented sample collection, and laboratory certification. The state typically advances testing costs, with reimbursement required from the father if he denied paternity but test results confirm biological parentage. DNA testing accuracy exceeds 99.99% for establishing or excluding paternity.
Administrative Paternity Establishment
The Division of Child Support can facilitate paternity establishment through administrative proceedings, which may be faster than court action. This process typically involves genetic testing coordination and can establish both paternity and child support obligations simultaneously. Administrative orders have the same legal effect as court orders and are entitled to full faith and credit in other states.
Custody Rights After Paternity is Established
Once paternity is legally established, South Dakota treats unmarried fathers identically to married fathers in custody proceedings. The court applies the best interest of the child standard under SDCL 25-4-45, considering the child's temporal, mental, and moral welfare without any gender-based preference. Fathers can petition for sole custody, joint custody, or specific parenting time arrangements with the same legal standing as mothers.
Legal Custody vs. Physical Custody
South Dakota distinguishes between two custody types that unmarried parents must understand:
Legal custody under SDCL 25-5-7.1 grants decision-making authority over major aspects of the child's life, including education, healthcare, religious upbringing, and extracurricular activities. Courts may award joint legal custody requiring both parents to participate in major decisions, or divide decision-making authority between parents by category. For example, one parent might control educational decisions while the other handles medical and dental care.
Physical custody determines where the child lives and the schedule of time with each parent. South Dakota courts can order joint physical custody in proportions serving the child's best interests, even over one parent's objection. The standard parenting time guidelines establish minimum schedules for noncustodial parents, including weekends from Friday at 3:15 PM through Monday at 8 AM, plus Wednesday overnight visits for children aged 5 and older.
Factors Courts Consider for Custody
South Dakota courts evaluate multiple factors through the best interest analysis, though the state does not codify a specific statutory list like many jurisdictions. Under SDCL 25-4-45 and case law, judges examine:
- Each parent's mental and physical health and fitness
- Capacity to provide for the child's physical and emotional needs
- Willingness to encourage frequent contact with the other parent (friendly parent factor)
- Ability to serve as a role model for responsible adulthood
- History of care and which parent served as primary caregiver
- Quality of the relationship between child and each parent
- The child's adjustment to home, school, and community
- Any history of domestic violence or abuse
Under SDCL 25-4A-24, when one parent requests joint physical custody, courts must specifically evaluate whether the child's psychological and emotional development will suffer from lack of active contact with either parent, and whether either parent has attempted to alienate the child from the other parent.
Filing a Custody Case as an Unmarried Parent
Unmarried parents seeking custody file a paternity action in the circuit court of any South Dakota county where either parent resides. The filing fee is approximately $70 for paternity cases, compared to $95-$120 for divorce filings. South Dakota has no minimum residency requirement; you must simply be a state resident at the time of filing. The mandatory 60-day waiting period under SDCL 25-4-34 applies from filing date to final order.
Required Court Forms and Process
The South Dakota Unified Judicial System provides standardized forms through ujs.sd.gov. Essential documents include the Petition to Establish Paternity and Custody, proposed parenting plan, and financial affidavit if child support is requested. Both parents must complete a court-approved parenting course within 60 days of filing through the SMILE Program, which costs approximately $20 per person.
Mediation Requirements
South Dakota law requires court-ordered mediation in custody disputes unless mediation is unavailable or the judge determines it inappropriate under the circumstances. Mediation costs range from $100 to $300 per hour, often split between parties. Domestic violence cases may be exempt from mediation requirements.
South Dakota Parenting Time Guidelines
The South Dakota Supreme Court established statewide parenting time guidelines as the default schedule when parents cannot agree on a specific plan. These guidelines under the Appendix to SDCL Chapter 25-4A provide age-appropriate schedules that courts apply unless parents create their own approved arrangement.
Standard Parenting Schedules by Age
| Child's Age | Noncustodial Parent's Time |
|---|---|
| 0-6 months | Three 2-hour visits per week, plus one weekend day for 6 hours |
| 6-18 months | Three 3-hour visits per week, plus one weekend day for 6 hours |
| 18-36 months | Up to three visits per week on predictable schedule, introducing overnights |
| 3-5 years | Building toward overnight visits, alternating weekends |
| 5+ years | Friday 3:15 PM through Monday 8 AM, plus Wednesday overnights |
Holiday and Vacation Time
The guidelines establish alternating holiday schedules for major occasions. Parents typically rotate Thanksgiving, Christmas Eve/Day, Easter, Memorial Day, July 4th, and Labor Day annually. Summer vacation allows extended parenting time of 2-4 weeks with the noncustodial parent, depending on the child's age. Parents may customize these provisions when they agree on alternative arrangements.
Phone and Electronic Communication
South Dakota guidelines guarantee each parent at least three phone calls per week with the child during the other parent's parenting time. A parent cannot confiscate a child's cell phone solely to deny communication with the other parent, though reasonable restrictions on cell phone use are permitted.
Child Support for Unmarried Parents
Child support obligations arise simultaneously with paternity establishment in South Dakota. Courts calculate support using income shares guidelines that consider both parents' gross incomes, the number of children, and the parenting time allocation. The Division of Child Support can help establish, collect, and modify support orders.
Under SDCL 25-8, upon determining paternity, courts enter judgments addressing reasonable pregnancy and confinement expenses, education costs, ongoing support, and funeral expenses if applicable. The court may require security for support payments and can modify orders as circumstances change. Both parents have equal obligations to support their children financially, regardless of marital status.
Modifying Custody Orders for Unmarried Parents
Unmarried parents can petition to modify custody and parenting time orders when circumstances substantially change. Under SDCL 25-4-45, courts may vacate or modify custody directions at any time. Importantly, SDCL 25-5-10.1 clarifies that changing the initial maternal custody presumption does not require proving a change in circumstances; the court simply applies the best interest standard.
Common grounds for modification include relocation of a parent, changes in work schedules affecting parenting time, the child's changing needs as they age, substance abuse concerns, and domestic violence. The parent seeking modification bears the burden of demonstrating that the change serves the child's best interests.
Domestic Violence and Custody for Unmarried Parents
South Dakota law creates a rebuttable presumption against awarding custody to a parent with a conviction or history of domestic abuse under SDCL 25-4-45.5. This presumption applies equally in paternity cases involving unmarried parents. The abusive parent must overcome this presumption by clear and convincing evidence that custody would serve the child's best interests.
Victims of domestic violence may request protective orders that affect parenting arrangements, including supervised visitation requirements. Courts can exempt domestic violence cases from mandatory mediation when face-to-face interaction would endanger a party.
Rights of Unmarried Fathers vs. Married Fathers
Once paternity is established, South Dakota law provides unmarried fathers with rights identical to married fathers. SDCL 25-5-7.1 expressly states that neither the husband and father nor the wife and mother has superior rights regarding the care, custody, education, and control of children. Courts cannot prefer one parent over the other based on gender in any custody determination.
The critical distinction is timing: married fathers have automatic legal recognition from birth, while unmarried fathers must establish paternity first. This delay can create practical disadvantages if the mother relocates or makes major decisions before paternity is established. Unmarried fathers should act promptly to secure their parental rights, ideally by signing a Voluntary Acknowledgment of Paternity at the hospital.