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9. Income and Social Contribution Taxes (Details 3) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income And Social Contribution Taxes Details 3      
Income (loss) before taxes and share of profit (loss) of joint ventures, and associates R$ 2,392,624 R$ 2,263,134 R$ 2,258,192
Statutory tax rates 34.00% 34.00% 34.00%
Income and social contribution taxes at the statutory tax rates R$ (813,492) R$ (769,466) R$ (767,785)
Adjustments to the statutory income and social contribution taxes:      
Nondeductible expenses (105,017) (57,961) (70,540)
Nontaxable revenues 19,084 7,561 3,753
Adjustment to estimated income 10,844 14,218 12,926
Interest on equity (550) (364) 0
Other adjustments 1,104 7,108 4,874
Income and social contribution taxes before tax incentives (888,027) (798,904) (816,772)
Tax incentives—SUDENE 48,598 98,912 82,436
Income and social contribution taxes in the income statement (839,429) (699,992) (734,336)
Current (922,458) (800,497) (719,523)
Deferred R$ 83,029 R$ 100,505 R$ (14,813)
Effective IRPJ and CSLL rates 35.00% 30.90% 32.50%