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Income and Social Contribution Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
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Summary of Income and Social Contribution Taxes recoverable |
|  | 2017 |  |  | 2016 |
Current |  |  |  |  |  |  |  |
Income tax |  |  | 224 |  |  |  | 436 |
Social contribution tax |  |  | 116 |  |  |  | 154 |
|  |  | 340 |  |  |  | 590 |
Non-current |  |  |  |  |  |  |  |
Income tax |  |  | 7 |  |  |  | 98 |
Social contribution tax |  |  | 14 |  |  |  | 14 |
|  |  | 21 |  |  |  | 112 |
|  |  | 361 |  |  |  | 702 |
Summary of Deferred Income and Social Contribution Taxes | The Company has tax credits for income tax and the Social Contribution tax, arising from balances of tax losses, negative base for the Social Contribution tax, and temporary differences, at the rates of 25% (for Income tax) and 9% (for the Social Contribution tax), as follows:
|  | 2017 |  |  | 2016 |
Deferred tax assets |  |  |  |  |  |  |  |
Tax loss carryforwards |  |  | 524 |  |  |  | 290 |
Provisions |  |  | 1,093 |  |  |  | 1,027 |
Post-retirement obligations |  |  | 1,179 |  |  |  | 1,175 |
Estimated provision for doubtful receivables |  |  | 207 |  |  |  | 229 |
Taxes with suspended liability |  |  | 14 |  |  |  | 202 |
Paid concession |  |  | 8 |  |  |  | 8 |
Adjustment to fair value: Swap/loss |  |  | 13 |  |  |  | — |
Others |  |  | 14 |  |  |  | 22 |
Total |  |  | 3,052 |  |  |  | 2,953 |
Deferred tax liabilities |  |  |  |  |  |  |  |
Funding cost |  |  | (31 | ) |  |  | (45 | )
Deemed cost |  |  | (276 | ) |  |  | (268 | )
Cost of acquisition of equity interests |  |  | (464 | ) |  |  | (481 | )
Borrowing costs capitalized |  |  | (166 | ) |  |  | (149 | )
Taxes on revenues not redeemed – Presumed Profit accounting method |  |  | (1 | ) |  |  | (2 | )
Transmission assets: Indemnity gain |  |  | (937 | ) |  |  | (517 | )
Adjustment to expectation of cash flow from the indemnifiable Financial assets of the distribution concession |  |  | — |  |  |  | (271 | )
Others |  |  | (41 | ) |  |  | (5 | )
Total |  |  | (1,916 | ) |  |  | (1,738 | )
Total, net |  |  | 1,136 |  |  |  | 1,215 |
Total assets |  |  | 1,871 |  |  |  | 1,797 |
Total liabilities |  |  | (735 | ) |  |  | (582 | )
Summary of Changes in Deferred Income and Social Contribution Taxes | The changes in deferred income and Social Contribution taxes were as follows:
Balance at December 31, 2014 |  |  | 635 |
Effects allocated to Statement of income |  |  | (12 | )
Effects allocated to Statement of comprehensive income |  |  | 191 |
Realized |  |  | (5 | )
Balance at December 31, 2015 |  |  | 809 |
Effects allocated to Statement of income |  |  | 141 |
Effects allocated to Statement of comprehensive income |  |  | 265 |
Balance at December 31, 2016 |  |  | 1,215 |
Effects allocated to Statement of income |  |  | (198 | )
Effects allocated to Statement of comprehensive income |  |  | 133 |
Variations in deferred tax assets and liabilities |  |  | (14 | )
Balance at December 31, 2017 |  |  | 1,136 |
Summary of Estimated Balance of Deferred Tax Asset | The Company estimated that the balance of deferred tax asset on December 31, 2017 will be realized, as follows:
2018 |  |  | 421 |
2019 |  |  | 477 |
2020 |  |  | 476 |
2021 |  |  | 452 |
2022 |  |  | 465 |
2023–2025 |  |  | 493 |
2026–2027 |  |  | 268 |
|  |  | 3,052 |
Summary of Reconciliation of Statutory on Income and Social Contribution Taxes | This table reconciles the statutory income tax (rate 25%) and social contribution tax (rate 9%) with the current income tax expense in the Statement of income:
|  | 2017 |  |  | 2016 |  |  | 2015 |
Profit before income and Social Contribution taxes |  |  | 1,646 |  |  |  | 367 |  |  |  | 3,362 |
Income tax and Social Contribution tax – nominal expense |  |  | (560 | ) |  |  | (125 | ) |  |  | (1,143 | )
Tax effects applicable to: |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) in subsidiaries by equity method (net of effects of Interest on Equity) |  |  | (129 | ) |  |  | (132 | ) |  |  | 105 |
Interest on Equity |  |  | — |  |  |  | 129 |  |  |  | 68 |
Gain on formation of Aliança Geração |  |  | — |  |  |  | — |  |  |  | 87 |
Gain on dilution of an equity interest |  |  | 8 |  |  |  | — |  |  |  | — |
Deduction – Intangible assets of concession amortized – capital gain –Taesa |  |  | — |  |  |  | 20 |  |  |  | — |
Non-deductible contributions and donations |  |  | (6 | ) |  |  | (4 | ) |  |  | (7 | )
Tax incentives |  |  | 11 |  |  |  | 3 |  |  |  | 43 |
Tax credits not recognized |  |  | — |  |  |  | 5 |  |  |  | (1 | )
Difference between Presumed Profit and Real Profit |  |  | 81 |  |  |  | 126 |  |  |  | 25 |
Non-deductible penalties |  |  | (14 | ) |  |  | (16 | ) |  |  | (10 | )
Excess reactive power and demand |  |  | (2 | ) |  |  | (12 | ) |  |  | (11 | )
Write-down of part of estimated losses for doubtful debtors |  |  | — |  |  |  | (22 | ) |  |  | (32 | )
Others |  |  | (33 | ) |  |  | (5 | ) |  |  | (17 | )
Income tax and Social Contribution – effective gain (expense) |  |  | (644 | ) |  |  | (33 | ) |  |  | (893 | )
Current tax |  |  | (446 | ) |  |  | (174 | ) |  |  | (881 | )
Deferred tax |  |  | (198 | ) |  |  | 141 |  |  |  | (12 | )
|  |  | (644 | ) |  |  | (33 | ) |  |  | (893 | )
Effective rate |  |  | 39.13 | % |  |  | 8.99 | % |  |  | 26.56 | %

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