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19 Deferred taxes and contributions (Details 4) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Deferred Taxes And Contributions |  |  |  |
Profit before income taxes |  | R$ 1,326,002 | R$ 4,677,942 | R$ 3,912,319
Statutory rate |  | 34.00% | 34.00% | 34.00%
Estimated expense at statutory rate |  | R$ (450,841) | R$ (1,590,500) | R$ (1,330,186)
Tax benefit of interest on equity |  | 126,604 | 312,339 | 264,816
Permanent differences Provision - Law 4,819/1958 - G0 | [1] | (37,675) | (44,426) | (46,544)
Donations |  | (8,672) | (19,888) | (13,068)
Other differences |  | 17,900 | 32,050 | 47,731
Income tax and social contribution |  | (352,684) | (1,310,425) | (1,077,251)
Current income tax and social contribution |  | (460,721) | (1,155,463) | (852,655)
Deferred income tax and social contribution |  | R$ 108,037 | R$ (154,962) | R$ (224,596)
Effective rate |  | 27.00% | 28.00% | 28.00%
[1] | Permanent difference related to the provision for actuarial liability (Note 21 (b) (ii)).

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