Despite considerable research on the causes of non-take up little has been concerned with a quantification of the actual impact this may have, too often this is merely assumed. But without good evidence about the true consequences of improving take up, why should we be concerned with it? As chapter two demonstrated, the evidence base in this area is small but growing. Indeed a National Audit Office contribution to this specific debate (NAO, 2002) was in part based on a background report co-written by the author (Craig et al, 2002). To extend this evidence base this chapter puts forward evidence using data from the Millennium Poverty and Social Exclusion (PSE) Survey and the Family Expenditure Survey (FES). These are used to explore the ways in which spending may change following Minimum Income Guarantee take up.