This document provides an overview of the critical role of fiscal data in state Part C systems. This information is intended to help state Part C lead agency staff better understand strategic fiscal policy questions, the fiscal data elements needed to address those questions, and the benefits of using these data. Fiscal data provide powerful information for decision-making, program management, and policy-making. The use of fiscal data, especially when paired with child and family demographic data and data about services, can help state Part C staff and stakeholders better understand the dynamics that influence the Part C program and its financing. This document is divided into four sections: (1) the importance of collecting fiscal data; (2) what fiscal data should be collected and where those data can be located; (3) sample templates for planning data analysis; and (4) a glossary of fiscal terms that are important to establish a common terminology.