Improved domestic revenue mobilization lies at the heart of the Sustainable Development agenda. At the Addis Ababa Financing for Development Conference in 2015, developing countries committed to improve national efforts and donors committed to double their assistance for tax reform. And yet, media leaks in 2016 increased awareness of wealth hidden in offshore tax havens and have driven new demand for fair and effective tax systems. This event is designed to start a conversation around the premise that: (1) countries need a certain level of tax revenue â€“ 15 percent of GDP â€“ to provide basic services to their citizens; and (2) we all have roles in helping them achieve that goal. Share your thoughts and questions on social media using #Tax4Dev.