Does Utah's aircraft valuation law violate constitutional assessment requirements? Salt Lake County v. Tax Commission Explained

In Salt Lake County v. Tax Commission, the Utah Supreme Court examined whether Utah’s Aircraft Valuation Law violates constitutional requirements for property tax assessments. The case arose when Salt Lake County challenged the Utah Tax Commission’s 2017 assessment of Delta Air Lines’ aircraft fleet.

Background and Facts

In 2017, the Utah Legislature enacted the Aircraft Valuation Law, establishing a specific methodology for valuing airline aircraft. The law requires the Tax Commission to use the “Airliner Price Guide” (APG) and apply a fleet discount of up to 20% for airlines owning multiple aircraft. For Delta’s 2017 assessment, this methodology produced a valuation of $14.8 billion, significantly lower than the $37.3 billion valuation produced by Salt Lake County’s unitary approach appraisal. The County argued that the APG methodology undervalued Delta’s aircraft because it failed to capture their value as part of an operating airline business.

Key Legal Issues

The case presented two constitutional challenges. First, the County claimed the Aircraft Valuation Law violated article XIII, section 2 of the Utah Constitution by requiring assessment below fair market value. Second, the County argued the law facially violated article XIII, section 6 by impermissibly divesting the Tax Commission of its assessment authority.

Court’s Analysis and Holding

The court rejected both challenges. For the as-applied challenge, the court noted that the Aircraft Valuation Law contains a statutory safety valve allowing alternative valuation methods if two conditions are met: (1) clear and convincing evidence that APG values don’t reasonably reflect fair market value, and (2) no alternative aircraft pricing guide can be identified. While the County may have satisfied the first condition, it failed to address the second requirement, never attempting to show that other available pricing guides would fail to reach fair market value.

For the facial challenge, the court distinguished the case from Southern Pacific, explaining that prescribing a valuation methodology differs from impermissibly delegating assessment authority to another entity. The legislature retains constitutional authority to determine methods for ascertaining fair market value.

Practice Implications

This decision demonstrates the importance of thoroughly pursuing all available statutory remedies before mounting constitutional challenges to tax assessment procedures. The court’s analysis reinforces that legislative prescription of valuation methods falls within constitutional bounds, provided appropriate safeguards exist. For practitioners challenging specialized assessment statutes, ensuring compliance with all procedural requirements, including safety valve provisions, is essential before asserting constitutional violations.