Paul H. Frankel, partner in Morrison & Foerster LLP and chairman of the BNA Multistate Tax Advisory Board, is a leading authority on state tax issues. Each year, he and his colleagues prepare this list of important issues in state taxation facing tax practitioners, with a focus on judicial developments. As in past years, nexus continues to be a hotly debated concept, along with disputes over apportionment and states' ongoing fascination with combined reporting.