| | | 2017 | | 2016 | | ||
| Deferred tax assets (liabilities) | | | | | | | |
| Provisions (3) | | | 1,840,988 | | | 1,875,965 | |
| Employee benefits (2) | | | 1,373,561 | | | 656,997 | |
| Loss carry forwards | | | 611,766 | | | 477,808 | |
| Accounts payable | | | 208,618 | | | 311,607 | |
| Accounts receivable | | | 94,864 | | | 133,840 | |
| Property plant and equipment and Natural and environmental resources (1) | | | (1,006,299) | | | (220,315) | |
| Goodwill | | | (408,932) | | | (345,288) | |
| Borrowings and other financial liabilities | | | - | | | (113,497) | |
| Others | | | (31,685) | | | (168,806) | |
| | | | 2,682,881 | | | 2,608,311 | |
| | | | | | | | |
| Deferred tax assets | | | 4,016,161 | | | 4,248,014 | |
| Deferred tax liabilities | | | (1,333,280) | | | (1,639,703) | |
| | | | 2,682,881 | | | 2,608,311 | |
| (1) | For tax purposes, natural and environmental resources and property, plant and equipment have a useful life and a depreciation and amortization calculation methodology different from those determined as per international accounting standards. |
| (2) | Actuarial calculations for health, retirement pensions, education, pension bonds and other benefits to long-term employees. |
| (3) | The most representative item corresponds to the provision for well abandonment. |