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Income tax expense (Tables) | 12 Months Ended
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Dec. 31, 2017
Text block1 [abstract] |
Summary of Income Tax Expense |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Current income tax expense |  |  | (437,967 | ) |  |  | (200,663 | ) |  |  | (591,297 | )
Deferred income tax expense |  |  | (133,791 | ) |  |  | (222,497 | ) |  |  | (75,815 | )
Total income tax expense |  |  | (571,758 | ) |  |  | (423,160 | ) |  |  | (667,112 | )
Summary of Income Tax Recognized Directly in Equity |
Income tax relating to each component of other comprehensive income |  |  |  |  |  |  |  |  |
2017 |  | Before tax |  |  | Tax (expense)/ credit |  |  | Net of tax |
Foreign currency translation differences |  |  | 100,149 |  |  |  | (107,299 | ) |  |  | (7,150 | )
Remeasurements of employee termination benefits |  |  | (3,738 | ) |  |  | 748 |  |  |  | (2,990 | )
|  |  | 96,411 |  |  |  | (106,551 | ) |  |  | (10,140 | )
2016 |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation differences |  |  | 218,472 |  |  |  | (87,381 | ) |  |  | 131,091 |
Remeasurements of employee termination benefits |  |  | (34,532 | ) |  |  | 7,066 |  |  |  | (27,466 | )
|  |  | 183,940 |  |  |  | (80,315 | ) |  |  | 103,625 |
2015 |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation differences |  |  | (384,466 | ) |  |  | (5,749 | ) |  |  | (390,215 | )
Changes in cash flow hedge reserve |  |  | 719 |  |  |  | — |  |  |  | 719 |
Remeasurements of employee termination benefits |  |  | (13,466 | ) |  |  | 2,563 |  |  |  | (10,903 | )
|  |  | (397,213 | ) |  |  | (3,186 | ) |  |  | (400,399 | )
Summary of Reconciliation of Effective Income Tax Expense | Reconciliation of income tax expense
|  | 2017 |  |  | 2016 |  |  | 2015 |
Profit from continuing operations before income tax expense |  |  | 2,609,517 |  |  |  | 2,009,127 |  |  |  | 2,203,327 |
Profit from discontinued operations before income tax expense |  |  | — |  |  |  | (42,164 | ) |  |  | 367,336 |
Profit before income tax expense |  |  | 2,609,517 |  |  |  | 1,966,963 |  |  |  | 2,570,663 |
Tax at the Turkey’s tax rate |  |  | (521,903 | ) |  |  | (393,393 | ) |  |  | (514,133 | )
Difference in overseas tax rates |  |  | 4,133 |  |  |  | (15,935 | ) |  |  | (52,688 | )
Effect of exemptions (*) |  |  | 73,916 |  |  |  | 104,244 |  |  |  | 62,163 |
Effect of amounts which are not deductible |  |  | (102,102 | ) |  |  | (78,571 | ) |  |  | (16,104 | )
Utilization of previously unrecognized tax losses |  |  | — |  |  |  | 1,253 |  |  |  | 22,863 |
Change in unrecognized deferred tax assets (**) |  |  | (41,340 | ) |  |  | (30,616 | ) |  |  | (198,364 | )
Adjustments for current tax of prior years |  |  | 11,280 |  |  |  | (8,176 | ) |  |  | — |
Tax effect of investment in associate |  |  | — |  |  |  | — |  |  |  | 32,926 |
Other |  |  | 4,258 |  |  |  | (1,966 | ) |  |  | (3,775 | )
Total income tax expense |  |  | (571,758 | ) |  |  | (423,160 | ) |  |  | (667,112 | )
| (*) | Mainly comprises of research and development tax credit.
| (**) | Mainly comprises of tax losses for which no deferred tax asset has been recognized.

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