What are the different types of taxes upon which California relies? What is their relative importance, and how have they evolved over time? How large a “burden” do these taxes impose on Californians, both in absolute terms and compared to other states, and how is this burden distributed? What types of policy issues are associated with the current tax structure, especially in light of our changing economy? The purpose of this primer is to address these and other tax-related questions, so as to aid policymakers and other interested parties in their tax-related deliberations and decision making.