Group Health Cooperative v. City of Seattle, 189 P.3d 216 (Wash. Ct. App. 2008)

Outcome: Group Health entitled to $1 million plus refund.

Description: Group Health successfully asserted that the City of Seattle was preempted by state law from imposing its B&O tax on premium receipts and also that the City of Seattle was incorrectly computing interest on deficiencies and refunds as mandated by the state legislature.