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18. Deferred taxes and contributions | 12 Months Ended
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Dec. 31, 2017
Deferred Taxes And Contributions |
Deferred taxes and contributions | (a) Statement of financial position details
| December 31, 2017 | December 31, 2016
Deferred income tax assets |  |
Provisions | 482,863 | 524,129
Actuarial gain/loss – G1 Plan | - | 85,044
Pension obligations - G1 | 165,503 | 167,922
Donations of underlying asset on concession agreements | 55,112 | 57,317
Credit losses | 199,063 | 266,757
Other | 151,562 | 151,247
Total deferred tax assets | 1,054,103 | 1,252,416
Deferred income tax liabilities |  |
Temporary difference on concession of intangible asset | (460,177) | (492,341)
Capitalization of borrowing costs | (415,379) | (374,512)
Profit on supply to governmental entities | (76,705) | (92,365)
Actuarial gain/loss – G1 Plan | (36,538) | -
Construction margin | (88,947) | (91,790)
Borrowing costs | (13,111) | (15,063)
Total deferred tax liabilities | (1,090,857) | (1,066,071)
Deferred tax assets (liabilities), net | (36,754) | 186,345
(b) Realization
| December 31, 2017 | December 31, 2016
Deferred income tax assets |  |
to be realized within 12 months | 221,999 | 314,725
to be realized after one year | 832,104 | 937,691
Total deferred tax assets | 1,054,103 | 1,252,416
Deferred income tax liabilities |  |
to be realized within 12 months | (51,520) | (143,428)
to be realized after one year | (1,039,337) | (922,643)
Total deferred tax liabilities | (1,090,857) | (1,066,071)
Deferred tax asset (liabilities) | (36,754) | 186,345
(c) Changes
Deferred income tax assets | December 31, 2016 | Net change | December 31, 2017
Provisions | 524,129 | (41,266) | 482,863
Actuarial gain/loss – G1 | 85,044 | (85,044) | -
Pension obligations - G1 | 167,922 | (2,419) | 165,503
Donations of underlying asset on concession agreements | 57,317 | (2,205) | 55,112
Credit losses | 266,757 | (67,694) | 199,063
Other | 151,247 | 315 | 151,562
Total | 1,252,416 | (198,313) | 1,054,103
Deferred income tax liabilities |  |  |
Temporary difference on concession of intangible asset | (492,341) | 32,164 | (460,177)
Capitalization of borrowing costs | (374,512) | (40,867) | (415,379)
Profit on supply to governmental entities | (92,365) | 15,660 | (76,705)
Actuarial gain/loss – G1 | - | (36,538) | (36,538)
Construction margin | (91,790) | 2,843 | (88,947)
Borrowing costs | (15,063) | 1,952 | (13,111)
Total | (1,066,071) | (24,786) | (1,090,857)
Deferred tax assets (liabilities), net | 186,345 | (223,099) | (36,754)
Deferred income tax assets | December 31, 2015 | Net change | December 31, 2016
Provisions | 480,378 | 43,751 | 524,129
Pension obligations – G0 | - | 85,044 | 85,044
Pension obligations - G1 | 256,808 | (88,886) | 167,922
Donations of underlying asset on concession agreements | 53,206 | 4,111 | 57,317
Credit losses | 213,171 | 53,586 | 266,757
Tax losses | 58,829 | (58,829) | -
Other | 121,550 | 29,697 | 151,247
Total | 1,183,942 | 68,474 | 1,252,416
Deferred income tax liabilities |  |  |
Temporary difference on concession of intangible asset | (524,495) | 32,154 | (492,341)
Capitalization of borrowing costs | (309,648) | (64,864) | (374,512)
Profit on supply to governmental entities | (81,055) | (11,310) | (92,365)
Actuarial gain/loss – G1 | (33,726) | 33,726 | -
Construction margin | (94,921) | 3,131 | (91,790)
Borrowing costs | (11,855) | (3,208) | (15,063)
Total | (1,055,700) | (10,371) | (1,066,071)
Deferred tax asset, net | 128,242 | 58,103 | 186,345
| December 31, 2017 | December 31, 2016 | December 31, 2015
Opening balance | 186,345 | 128,242 | 209,478
Net change in the year: |  |  |
- corresponding entry to the income statement | (101,517) | (60,667) | (50,024)
- corresponding entry to valuation adjustments to equity (Note 20 (b)) | (121,582) | 118,770 | (31,212)
Total net change | (223,099) | 58,103 | (81,236)
Closing balance | (36,754) | 186,345 | 128,242
(d) Reconciliation of the effective tax rate The amounts recorded as income tax and social contribution expenses in the financial statements are reconciled to the statutory rates, as shown below:
| December 31, 2017 | December 31, 2016 | December 31, 2015
Profit before income taxes | 3,503,614 | 4,129,054 | 587,529
Statutory rate | 34% | 34% | 34%
Estimated expense at statutory rate | (1,191,229) | (1,403,878) | (199,760)
Tax benefit of interest on equity | 245,444 | 245,637 | 56,172
Permanent differences |  |  |
Provision – Law 4,819/58 (i) | (57,104) | (63,039) | (54,679)
Donations | (12,413) | (10,987) | (3,153)
GESP Agreement (note 10 (vii)) | - | - | 151,465
Other differences | 30,998 | 50,311 | (1,295)
Income tax and social contribution | (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 | (101,517) | (60,667) | (50,024)
Effective rate | 28% | 29% | 9%
(i) Permanent difference related to the provision for actuarial liability (Note 20 (b) (iii)).

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