Seven cost-benefit analyses have been undertaken in the United States and Australia to examine the costs to society of providing extra supports to youth in care after the age of 18. The studies reveal vastly different approaches, assumptions, and data sources. Yet all reach the same conclusion: increased investment in services for youth transitioning fromcare yield benefits in the long term. This is the first such study to be done in Canada. The analysis is based on the best and most promising aspects of the seven cost-benefit analyses mentioned above. The report examines available Ontario data, as well as Canadian and international sources, to estimate the cost of a program extension in Ontario. It also estimates the savings that could be achieved by bettering the lives of youth aging out of care.