Low-wage workers often face a dual challenge as they struggle to make ends meet. In many instances, the wages they earn are insufficient to encourage additional hours of work or long-term attachment to the labor force. At the same time, most state and local tax systems impose greater responsibilities on poor families than on wealthy ones, making it even harder for low-wage workers to move above the poverty line and achieve meaningful economic security. The Earned Income Tax Credit (EITC) is designed to help low-wage workers meet both those challenges. This policy brief explains how the credit works at the federal level and what policymakers can do to build upon it at the state level.