The belief that a civilized society should seek to prevent destitution among its citizens is one of the oldest ideas in politics, yet the idea that this should be achieved through a guaranteed minimum income is relatively new. This chapter takes John Kay’s concept of ‘Redistributive Market Liberalism’ as a starting point for examining how cash transfers became central to British social policy debate in the course of the twentieth century. Drawing on work by Samuel Fleischacker, Martin Ravallion, and Alice O’Connor, it argues that a guaranteed minimum income is a distinctly modern concept, shaped by an Enlightenment conception of distributive justice, an Anglo-American tradition of ‘poverty knowledge’, and the methodological individualism of neoclassical economics. The collapse of manufacturing employment since the 1970s, together with a declining faith in planning and collective provision, has encouraged UK governments to pursue their distributional objectives through the tax and benefit systems.