One of the key interventions aimed at improving the welfare of South African households has been local government’s provision of a package of free basic municipal services to poor households. It is, however, not completely clear how different municipalities identify households that are eligible for these services. Evidence suggests that many municipalities currently provide services to all households with a monthly income of less than R1500 a month. This ‘free basic services poverty line’ is, however, low in comparison with a number of unofficial poverty lines used by policymakers and researchers in South Africa. This paper considers the impact of increasing the value of the free basic services line, in terms of the additional share and number of households eligible for support and the additional financial cost. We find that urban municipalities would face the steepest increases in their free basic services budgets with any potential increase in the free basic services poverty line.