This course is designed to build upon the professional's basic knowledge of multistate income taxation issues. It covers advanced topics in this area, including economic, agency and affiliate nexus; specialized industry apportionment formulas; sales sourcing rules; non-income taxes; and taxation of pass-through entities. It also discusses mechanisms used by states to limit tax base erosion. Upon completing this course, you should be able to: • Explain the theories of economic nexus, agency nexus, and affiliate nexus • Describe why states provide special rules for computing apportionment percentages for businesses in certain industries • Describe the cost-of-performance rule and market-based approach for sourcing sales of services • List which states impose unconventional business taxes in lieu of a regular corporate income tax • Detail the mechanisms states use to limit the ability of taxpayers to shift income and erode the state income tax base