Governments are navigating an era of compounding global crises, each placing new demands on already constrained budgets. Families are feeling the pressure. The rising cost of living is making it harder for parents to provide the nurturing care their children need in the years that matter most. When families cannot access affordable childcare, quality healthcare, or basic income support, the consequences fall first and hardest on the youngest children, in ways that are difficult and costly to reverse. That cost does not disappear. It accumulates quietly across a childhood and is carried by economies for decades. In this environment, the Act For Early Years campaign offers a clear message. Investing in young children is not a cost to be deferred. It is one of the most reliable returns available to any government. This guide sets out the evidence behind that claim, in terms that Finance Ministers and senior decision makers at national, local, and municipal levels can act on directly.