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19. Deferred taxes and contributions (Details 4) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Deferred Taxes And Contributions Details 4Abstract |  |  |  |
Profit before income taxes |  | R$ 3,912,319 | R$ 3,503,614 | R$ 4,129,054
Statutory rate |  | 34.00% | 34.00% | 34.00%
Estimated expense at statutory rate |  | R$ (1,330,186) | R$ (1,191,229) | R$ (1,403,878)
Tax benefit of interest on equity |  | 264,816 | 245,444 | 245,637
Permanent differences: Provision - Law 4,819/58 | [1] | (46,544) | (57,104) | (63,039)
Permanent differences: Donations |  | (13,068) | (12,413) | (10,987)
Other differences |  | 47,731 | 30,998 | 50,311
Income tax and social contribution |  | (1,077,251) | (984,304) | (1,181,956)
Current income tax and social contribution |  | (852,655) | (882,787) | (1,121,289)
Deferred income tax and social contribution |  | R$ (224,596) | R$ (101,517) | R$ (60,667)
Effective rate |  | 28.00% | 28.00% | 29.00%
[1] | Permanent difference related to the provision for actuarial liability (Note 21 (b) (iii)).

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