What caused the first sophisticated taxes on citizens?

The first sophisticated taxes on citizens emerged primarily as a response to the needs of expanding states and empires in ancient civilizations, such as Mesopotamia and Egypt. As societies grew, they required resources to fund public projects, military campaigns, and administration. This led to the establishment of organized tax systems, often based on agricultural production or trade, to ensure a steady revenue stream for governance and infrastructure development. The need for centralized control and economic stability also played a key role in the evolution of taxation systems.