In this paper, we describe South Africa's value added tax (VAT), showing that (1) the VAT is mildly regressive and (2) it is an effective source of government revenue, compared to other tax instruments in South Africa. We evaluate the VAT in the context of other distortions in the economy by computing the marginal cost of funds-the effect of raising government revenue by increasing the VAT rates on household welfare. Then we evaluate alternative, revenue-neutral tax systems in which we reduce the VAT and raise income taxes. For the analysis, we use a computable general equilibrium (CGE) model with detailed specification of South Africa's tax system. Households are disaggregated into income deciles. We demonstrate that alternative tax structures can benefit low-income households without placing excess burdens on high-income households.