This is a report of the CGD Working Group on Publish What You Buy. Government contracts regarding the use of public property and finances should be published by default. Many jurisdictions already require that contracts be made public in response to requests for the information; some now publish contracts proactively. Doing so helps new entrants compete in the market for public contracts, helps governments model their projects on other successful examples, and allows citizens greater insight into how their taxes are being spent. This brief, summarizing the conclusions of the Working Group on Government Contract Publication, provides a practical outline for reaping the benefits of open contracts while addressing legitimate concerns about costs, collusion, privacy, commercial secrecy, and national security. There is the full paper, a brief, and editorials in The Guardian and The Wall Street Journal.