The California Supreme Court recently ruled that local government entities cannot require taxpayers to follow additional procedures before filing for tax refunds. This decision affects how taxpayers across California can seek refunds from local governments, streamlining the process and ensuring compliance with state law.
The case, Tesoro Refining & Marketing Co. LLC v. City of Carson, was decided on August 10, 2026, under docket number S289952. The court's ruling clarifies that the Government Claims Act (GCA) governs all claims for money or damages against local public entities, including tax refund claims.
In this case, Tesoro Refining & Marketing Company LLC and Tesoro Logistics Operations LLC (collectively referred to as Tesoro) sought a refund for taxes they believed were improperly assessed by the City of Carson. The City had established its own administrative review procedures for tax refunds, requiring taxpayers to first file a request with the finance director before proceeding with a claim under the GCA. Tesoro argued that these additional steps were unnecessary and conflicted with state law.
The dispute began when Tesoro paid a tax deficiency assessed by the City after an audit. Following the audit, the City issued a notice claiming Tesoro had underpaid its business license tax. Tesoro contested this claim, asserting that the City had issued the notice after the legal time limit for such actions had expired and that the methodology used to calculate the tax was unlawful.
After the City denied Tesoro's claim for a refund, Tesoro filed a lawsuit. The City demurred, arguing that Tesoro had not exhausted the local administrative procedures before filing under the GCA. The trial court sided with the City, but Tesoro appealed. The Court of Appeal upheld the trial court's decision, leading Tesoro to seek review from the California Supreme Court.
The Supreme Court's ruling overturned the lower court's decisions, stating that the City of Carson's requirements for tax refund claims were preempted by the GCA. Chief Justice Guerrero, who authored the opinion, explained, "A local law that conflicts with state law is preempted and may not be enforced." The court emphasized that the GCA was intended to provide uniform procedures for presenting claims against local government entities.
The court's opinion highlighted that the GCA was designed to address the inconsistencies in claim procedures across various public entities in California. It noted, "Requiring a taxpayer to exhaust local administrative review procedures in addition to the GCA's procedures would frustrate the Legislature's primary purpose in enacting 'uniform procedures' for the presentation of such claims."
This ruling has significant implications for taxpayers in California. It means that local governments cannot impose additional requirements on taxpayers seeking refunds, ensuring that the process remains straightforward and consistent across the state. The decision reinforces the GCA's role as the primary framework governing claims against local entities, preventing local ordinances from creating unnecessary barriers for taxpayers.
Moreover, the court's ruling sets a precedent for future cases involving local government claims procedures. It clarifies that any local laws that attempt to impose additional requirements beyond those established by the GCA are invalid. This decision is expected to encourage more taxpayers to pursue legitimate claims without fear of being hindered by local administrative procedures.
Looking ahead, local governments may need to revise their procedures to comply with the court's ruling. This could lead to changes in how local tax refund requests are handled, potentially simplifying the process for taxpayers. The City of Carson, in particular, will need to align its practices with the GCA to avoid future legal challenges.
The ruling may also inspire similar cases in other jurisdictions, where taxpayers challenge local laws that impose additional requirements for claims against local governments. As taxpayers become more aware of their rights under the GCA, it is likely that we will see an increase in claims being filed without the burden of local administrative procedures.
In conclusion, the California Supreme Court's decision in Tesoro Refining & Marketing Co. LLC v. City of Carson clarifies the relationship between state law and local ordinances regarding tax refund claims. By affirming the GCA's preemptive authority, the court has reinforced the principle of uniformity in claims procedures, benefiting taxpayers throughout California.