The most significant tax discussionslawsuits which discuss (i) the deductibility of social contribution payments on net income (CSLL) from the calculation basis of corporate income tax (IRPJ), (ii) disallowances of Social Integration Program (PIS in portuguese) and Contribution to Social Security Financing (Cofins in portuguese) credits, (iii) CFEM fines (royalties) and (iv) charges related to taxes on the circulation of goods and services (ICMS).