On March 1, 2024, the U.S. Department of Health and Human Services, Administration for Children and Families (ACF) announced regulatory changes to the Child Care and Development Fund (CCDF). CCDF is the primary federal funding source devoted to helping families with low income afford child care and to increasing the quality of child care for all children. The changes included in the final rule aim to lower families' child care costs, improve child care provider payment rates and practices and simplify subsidy eligibility enrollment. The changes included in the final rule take effect April 30, 2024. This resource summarizes the changes states will be required or encouraged to implement under these rule changes. (author abstract)