The federal tax system and every state treat income from capital gains more favorably than income from work. Preferential capital gains tax treatment includes exclusions and seldom-discussed provisions like deferral and stepped-up basis, as well as more direct tax subsidies for profits realized from local investments and, in some instances, from investments around the world. This policy brief explains state capital gains taxation, examines the flaws in state capital gains tax breaks, and proposes reform options that will help make state tax systems more progressive and more equitable.