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18. Deferred taxes and contributions (Details 4) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Deferred Taxes And Contributions Details 4 |  |  |  |
Profit before income taxes |  | R$ 3,503,614 | R$ 4,129,054 | R$ 587,529
Statutory rate |  | 34.00% | 34.00% | 34.00%
Estimated expense at statutory rate |  | R$ (1,191,229) | R$ (1,403,878) | R$ (199,760)
Tax benefit of interest on equity |  | 245,444 | 245,637 | 56,172
Permanent differences: Provision – Law 4,819/58 | [1] | (57,104) | (63,039) | (54,679)
Permanent differences: Donations |  | (12,413) | (10,987) | (3,153)
Permanent differences: GESP Agreement |  | 0 | 0 | 151,465
Other differences |  | 30,998 | 50,311 | (1,295)
Actual income tax and social contribution expense |  | (984,304) | (1,181,956) | (51,250)
Current income tax and social contribution |  | (882,787) | (1,121,289) | (1,226)
Deferred income tax and social contribution |  | R$ (101,517) | R$ (60,667) | R$ (50,024)
Effective rate |  | 28.00% | 29.00% | 9.00%
[1] | Permanent difference related to the provision for actuarial liability (Note 20 (b) (iii)).

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