In Utah, unmarried fathers have no automatic legal rights to their children until paternity is legally established. Under Utah Code § 78B-15-202, an unmarried mother has primary custodial rights by default, while the biological father must take affirmative legal steps to gain any custody or visitation rights. The filing fee for a paternity petition in Utah district court is $375 under Utah Code § 78A-2-301, and the process typically takes 3-6 months when uncontested. Once paternity is established, both parents have equal standing to petition for custody, parent-time, and child support under the same best-interest standards that apply to married parents.
Key Facts: Custody for Unmarried Parents in Utah (2026)
| Factor | Details |
|---|---|
| Filing Fee (Paternity Petition) | $375 (Utah Code § 78A-2-301) |
| Counterclaim Fee | $170 |
| Modification Fee | $100 |
| DNA Test Cost | $295-$500 (court-ordered legal test) |
| Default Custody | Mother has primary rights until paternity established |
| VDP Rescission Window | 60 days or until child support order, whichever is earlier |
| Joint Physical Custody Threshold | 111 overnights minimum (30% of year) |
| Mandatory Parenting Class | $65 per parent |
| Response Deadline | 21 days (in-state) or 30 days (out-of-state) |
How Unmarried Fathers Establish Paternity in Utah
Unmarried fathers in Utah must establish legal paternity through one of three methods before gaining any custody or visitation rights. Under Utah Code § 78B-15-201, the biological father has no automatic parental rights, even if his name appears on the birth certificate. The three paternity establishment methods are: Voluntary Declaration of Paternity (VDP), administrative order through the Office of Recovery Services (ORS), or court adjudication via a parentage action filed in district court.
Method 1: Voluntary Declaration of Paternity (VDP)
The Voluntary Declaration of Paternity is the fastest and least expensive method for establishing paternity in Utah, typically completed at the hospital immediately after birth. Under Utah Code § 81-5-305, a properly executed VDP filed with the Office of Vital Records is legally equivalent to a court judgment of paternity and confers upon the father all parental rights and duties. Both parents sign the VDP in front of two witnesses, and if either parent is under 18, a parent or guardian must also sign. The VDP becomes part of the child's birth certificate, and there is no cost to complete this process at the hospital.
Method 2: Administrative Order Through ORS
The Utah Office of Recovery Services (ORS) can establish paternity through an administrative process without court involvement, typically used when child support is being sought. This administrative process is governed by Utah Code § 78B-15-601 through § 78B-15-621, and genetic testing is usually provided free of charge for families with open ORS cases. However, ORS administrative orders cannot address custody or parent-time arrangements, meaning a separate court action is still required for the father to obtain visitation or custody rights.
Method 3: Court Adjudication (Parentage Action)
Filing a parentage action in Utah district court is the most comprehensive method, allowing the court to simultaneously establish paternity and address custody, parent-time, and child support in a single proceeding. The filing fee is $375 under Utah Code § 78A-2-301, with counterclaims costing an additional $170. Court-ordered DNA testing typically costs $295-$500, and the requesting party usually pays initially, though the court may reallocate costs. A DNA test must show 99% or higher probability of paternity with a combined paternity index of at least 100 to constitute clear and convincing evidence under Utah law.
Custody Types Available to Unmarried Parents
Once paternity is established, unmarried parents in Utah have the same custody rights as divorced parents under Utah Code § 81-9-201 through § 81-9-208. Utah courts recognize both physical custody (where the child lives) and legal custody (decision-making authority), and either type can be sole or joint. There is a rebuttable presumption favoring joint legal custody under Utah Code § 81-9-205, meaning courts will award shared decision-making unless evidence shows it would harm the child.
Physical Custody Classifications
Utah law defines joint physical custody as arrangements where each parent has the child for at least 111 overnights per year (30% of the year). Sole physical custody means one parent has the child more than 255 overnights annually, while the other parent receives parent-time (visitation). Split custody, where siblings are divided between households, is disfavored but permitted when in the children's best interests. The custody classification directly affects child support calculations under the Utah Child Support Act.
Legal Custody Arrangements
Joint legal custody requires parents to confer and make major decisions together regarding the child's education, healthcare, religious upbringing, and extracurricular activities. Sole legal custody grants one parent exclusive decision-making authority, typically awarded only when joint decision-making would be harmful due to domestic violence, substance abuse, or an inability to cooperate. Under Utah Code § 81-9-205, courts must consider the parents' ability to prioritize the child's welfare and reach shared decisions when determining legal custody.
Best Interest Factors Utah Courts Consider
Utah courts determine custody based on the best interests of the child, applying a preponderance of the evidence standard under Utah Code § 81-9-204. Courts evaluate multiple statutory factors, with no single factor being determinative. Judges have broad discretion but must articulate findings supporting their custody decisions.
Statutory Best Interest Factors
The Utah custody statute requires courts to consider: the strength and quality of the parent-child bond; each parent's past conduct and demonstrated parenting abilities; the child's physical, psychological, and emotional needs; the willingness of each parent to encourage a relationship with the other parent; the child's preference if of sufficient age and maturity (typically 14 years or older); geographic proximity of the parents' homes; each parent's mental and physical health; and whether domestic violence, abuse, or neglect has occurred. Courts give substantial weight to historical caregiving patterns, meaning the parent who has been the primary caregiver often receives favorable consideration.
Factors That Can Disqualify Joint Custody
The presumption favoring joint legal custody does not apply when evidence shows domestic violence, physical abuse, sexual abuse, emotional abuse, or neglect involving the child, a parent, or household member. Substance abuse that impairs parenting ability, untreated mental health conditions affecting the child's safety, or a documented history of failing to support the child's relationship with the other parent can also overcome the joint custody presumption. Incarceration, abandonment, or failure to exercise awarded parent-time are additional factors courts consider.
Parent-Time Schedules for Noncustodial Parents
Utah law provides statutory parent-time schedules that serve as minimum guidelines for noncustodial parents under Utah Code § 81-9-301 through § 81-9-304. These schedules were renumbered effective September 1, 2024, from the former Title 30 to Title 81. The appropriate schedule depends on the child's age, with different provisions for children under 5, children ages 5-18, and optional expanded schedules for involved parents.
Standard Minimum Schedule (Ages 5-18)
The standard minimum parent-time schedule under Utah Code § 81-9-302 provides approximately 90 overnights annually for the noncustodial parent. This includes alternating weekends (Friday 6 PM to Sunday 7 PM), one weekday evening per week, half of major holidays (alternating years), extended summer time (up to 4 weeks), and half of school breaks. The schedule ensures regular and meaningful contact while providing stability through the school week.
Optional Expanded Schedule (Ages 5-18)
The optional expanded schedule under Utah Code § 81-9-303, amended in 2026, provides approximately 145 overnights annually. This schedule applies when parents agree or when the noncustodial parent demonstrates active involvement and effective communication. The expanded schedule includes every other weekend extended to Monday morning, midweek overnight on Wednesday, and increased holiday and summer time. For child support purposes, the 145-overnight threshold triggers different calculation adjustments.
Schedule for Children Under 5
Younger children have developmentally appropriate schedules under Utah Code § 81-9-304, recognizing their need for consistent routines and attachment stability. Infants (0-5 months) typically receive shorter, more frequent visits without overnights. Children 5-9 months may begin limited overnights. As children approach age 5, parent-time gradually increases toward the standard schedule. Courts consider the child's attachment patterns, breastfeeding needs, and temperament when crafting schedules for young children.
Child Support for Unmarried Parents
Child support obligations in Utah are calculated using the Utah Child Support Guidelines under Utah Code § 81-12-201 and apply equally to unmarried parents once paternity is established. Both parents' gross monthly incomes, the number of children, and the custody arrangement determine the support amount. Utah uses an income shares model, meaning support reflects what the child would have received if the parents lived together.
Support Calculation Factors
Utah child support calculations consider: combined adjusted gross income of both parents; number of children requiring support; health insurance premium costs for the child; work-related childcare expenses; and the overnight custody schedule. Joint physical custody (111+ overnights with each parent) uses a different calculation table than sole custody arrangements, typically resulting in lower support when parenting time is shared more equally.
Retroactive Child Support Limits
Under current law, courts may award retroactive child support going back up to four years in parentage actions. However, Utah HB 208 (2026), if passed, would reduce this window to one year prior to the filing date. This proposed change emphasizes the importance of establishing paternity promptly after birth to preserve support rights. Unmarried fathers should note that child support obligations begin when paternity is established, not from the child's birth date.
2026 Legislative Update: HB 208 Parentage Amendments
Utah's 2026 legislative session introduced House Bill 208, proposing significant changes to parentage law under the Utah Uniform Parentage Act. These amendments, if enacted, would affect both unmarried fathers and mothers in several key ways.
Key Proposed Changes
HB 208 proposes the following modifications: reducing retroactive child support from 4 years to 1 year prior to filing; extending the statute of limitations for children to bring parentage claims until age 26 (previously assumed to be 18); requiring clear and convincing evidence for parentage trials; limiting the ability to reopen adjudicated parentage determinations based on material mistake of fact; and clarifying limitations on unmarried biological fathers' petitions where adoption statutes restrict consent rights.
Impact on Unmarried Parents
The proposed amendments strengthen finality in parentage determinations while providing children more time to seek parentage adjudication as adults. Unmarried fathers would face tighter deadlines for retroactive support recovery, creating urgency to file promptly. The bill also aligns parentage procedures with adoption law, potentially affecting fathers who delay establishing paternity when adoption is contemplated.
Filing a Paternity and Custody Case: Step-by-Step Process
Unmarried parents seeking custody must first establish paternity if not already done, then file for custody and parent-time in Utah district court. The process involves multiple steps, filings, and hearings, typically taking 3-6 months when uncontested and 12-18 months or longer when disputed.
Step 1: File the Petition
File a Petition to Establish Parentage, Custody, and Support in the district court where the child resides. Pay the $375 filing fee or request a fee waiver using Form 1301GEG if you cannot afford it. The petition should state the basis for paternity (if not established), requested custody arrangement, proposed parent-time schedule, and child support request. Include the required civil cover sheet identifying the case type.
Step 2: Serve the Other Parent
The other parent must be formally served with the petition, summons, and accompanying documents within 120 days of filing. Service can be accomplished by a process server ($45-$75), sheriff's office, or certified mail with restricted delivery. The responding parent has 21 days to file an answer if served in Utah, or 30 days if served outside the state.
Step 3: Complete Mandatory Parenting Class
Both parents must complete a mandatory divorce education course costing $65 per person before the court will finalize any custody order. Utah requires this class for all custody cases, not just divorces. The course covers co-parenting communication, child development, and minimizing conflict's impact on children.
Step 4: Genetic Testing (If Paternity Disputed)
If the alleged father denies paternity or either party requests confirmation, the court will order genetic testing. Court-ordered DNA tests cost $295-$500 through accredited laboratories. Results showing 99% or higher probability establish paternity by clear and convincing evidence. The court determines which party pays testing costs.
Step 5: Mediation (Often Required)
Many Utah courts require mediation before contested custody hearings. Private mediation costs $750-$1,000 per session, while court-connected mediation programs may be available at reduced cost. Mediation success rates exceed 70% in Utah custody cases, often avoiding the expense and uncertainty of trial.
Step 6: Custody Evaluation (If Needed)
In highly contested cases, the court may order a custody evaluation by a mental health professional costing $3,000-$8,000. Evaluators interview both parents and children, observe parent-child interactions, review records, and make recommendations to the court. A guardian ad litem may also be appointed to represent the child's interests at $2,000-$5,000.
Step 7: Trial or Settlement
If parents cannot reach agreement, the court conducts a trial applying the best interest factors. Following trial or settlement, the court enters a final order addressing paternity, custody, parent-time, and child support. Either party may appeal within 30 days of the final judgment.
Modifying Custody Orders for Unmarried Parents
Custody orders are not permanent and can be modified when circumstances substantially change under Utah Code § 81-9-208. The modification filing fee is $100, significantly less than the initial petition. Both custody and parent-time can be modified, though different standards apply to each.
Custody Modification Standard
Modifying custody requires proving a substantial and material change in circumstances since the original order, plus showing that modification serves the child's best interests. Examples include: a parent's relocation affecting the schedule; documented safety concerns; significant changes in a parent's work schedule or living situation; the child's changing needs as they mature; or a parent's remarriage substantially affecting household dynamics.
Parent-Time Modification Standard
Parent-time modification requires only some showing of changed circumstances, a lesser standard than custody modification per the Utah Supreme Court's Jones v. Jones (2016) decision. This lower threshold recognizes that adjusting visitation schedules is less disruptive than changing primary custody. Common reasons include work schedule changes, the child's school or activity schedule, and improved parental cooperation.
Protecting Unmarried Father's Rights
Unmarried biological fathers in Utah face strict requirements to protect their parental rights, particularly when adoption may be contemplated. Under Utah Code § 81-13-207 and § 81-13-213, failure to comply with statutory requirements can result in permanent loss of parental rights without notice.
Critical Steps for Unmarried Fathers
To protect parental rights, unmarried fathers should: sign a VDP at the hospital if the mother agrees; register with the Utah Putative Father Registry; file a paternity action promptly if the mother will not cooperate; provide financial support during pregnancy and after birth; maintain regular contact with the child; and never delay when adoption rumors surface. Failure to act swiftly can result in an adoption proceeding without the father's consent or even notice.
VDP Rescission Rights
A father who signed a VDP can rescind within 60 days of signing or until a child support order is established, whichever occurs first. After this window, a VDP can only be challenged in court based on fraud, duress, or material mistake of fact. The material mistake of fact challenge must be brought within four years of signing the VDP under current law.