Does Utah jurisdiction for child support modification depend on physical residence or domicile? Lilly v. Lilly Explained

In Lilly v. Lilly, the Utah Court of Appeals addressed a critical jurisdictional question under the Uniform Interstate Family Support Act (UIFSA): whether Utah courts have jurisdiction to modify out-of-state child support orders based on a party’s physical residence or legal domicile.

Background and Facts

Aaron Lilly, an active duty Marine stationed in California, was born and raised in Utah. Following his 2001 marriage to Korilee Lilly and the birth of their child, the couple divorced in California in 2006 with a child support order requiring Aaron to pay $1000 monthly. After the divorce filing but before finalization, Korilee and the child moved to Utah. Aaron maintained his Utah domicile through voting, tax filing, and driver licensing in Utah, declaring his intent to return after military service. When Aaron petitioned Utah courts to modify the support order due to Korilee’s increased income, the district court dismissed for lack of subject matter jurisdiction, reasoning that jurisdiction was based on physical residence since Aaron lived in California.

Key Legal Issues

The case presented two interconnected questions: whether Utah had subject matter jurisdiction to modify the California child support order under UIFSA sections 205 and 613, and whether California’s subsequent modification deserved full faith and credit. The core interpretive issue was whether “residence” and “reside” in UIFSA mean physical residence or legal domicile.

Court’s Analysis and Holding

The Court of Appeals reversed, adopting the reasoning from California’s In re Marriage of Amezquita. The court interpreted UIFSA’s purpose—ensuring only one valid support order exists at any time—as requiring domicile-based jurisdiction. Allowing multiple physical residences would permit conflicting modifications, undermining UIFSA’s uniformity goals. The court emphasized that while a person may have multiple physical residences, they can maintain only one domicile. This interpretation promotes nationwide uniformity and prevents jurisdictional competition among states.

Practice Implications

For practitioners representing military personnel in interstate family law matters, this decision clarifies that Utah courts will examine domicile factors rather than physical presence. The court remanded for an evidentiary hearing on Aaron’s domicile, recognizing that military service members can maintain legal residence despite lengthy absences. Attorneys should prepare comprehensive evidence of domicile including voting records, tax returns, driver licensing, and documented intent to return to establish jurisdiction under UIFSA.