This article is part of series in which OECD experts and thought leaders – from around the world and all parts of society – address the COVID-19 crisis, discussing and developing solutions now and for the future. The number of COVID-19 cases is quickly rising around the world, with major adverse effects on health and mortality. To fight the outbreak and the spread of the virus, countries are imposing unprecedented measures, such as restrictions on the free movement of people and goods, and are shutting down large parts of the economy. The result is that economic activity has fallen sharply in many countries and increased global uncertainty has further eroded confidence. Apart from responding to the escalating health emergency, the immediate economic priority for policymakers is to respond quickly to provide support to households and to improve cash-flow for businesses: we need to keep capacities of production and distribution intact throughout this crisis. The goal is to ensure that households and businesses are able to keep their heads above water until the health crisis can be contained, so that the economy is ready to rebound once the worst of the pandemic has passed. While the OECD will keep working on long-term projects like tax co-operation among countries, international standards to eliminate double taxation, and the mobilisation of domestic resources, we have prioritised work on a range of targeted and temporary tax policy and tax administration measures governments could consider as part of their immediate response. We have also compiled all tax measures taken by governments to produce a useful toolkit. (…)