The aim of this study is to investigate the final effect of the National Tax System on income distribution and poverty in the State of Paraíba, based on information from the 2017/2018 Family Budget Survey (POF) on household consumption and income. It is verified whether the Tax on Transactions Relating to the Circulation of Goods and Provision of Interstate and Intermunicipal Transport and Communication Services (ICMS) in Paraíba is regressive, and whether this possible regressivity is offset by the Income Tax on Individuals ( IRPF). The methodology starts from measuring household consumption and the participation of income brackets in total income after assuming an increase in income that allows the family to move from a lower class to the next, determining the net income after deduction ICMS and IRPF. The results found show that the ICMS is a regressive tax, and that this regressivity is offset by the IRPF. Nevertheless, the degree of progressivity is insufficient for distributive purposes in view of the differences in income between the first and last income classes.