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Income tax incurred and deferred: (Details 1) - MXN ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income taxes [Abstract] |  |  |  |  |
Consolidated income before IT and joint venture equity method: |  |  | $ 8,498,889 | $ 4,887,130 | $ 3,962,934
Less: Net income before taxes of Airplan and Aerostar |  |  |  |  | 16,011
Net income before taxes of subsidiaries in Mexico not subject to IT |  |  | (62,327) | (56,415) | (118,981)
Income before provisions for income taxes |  |  | $ 8,452,573 | $ 4,830,715 | $ 3,843,953
Statutory IT rate |  | 33.00% | 30.00% | 30.00% | 30.00%
ISR that would result from applying the ISR rate to book profit before income taxes |  |  | $ 2,535,772 | $ 1,449,214 | $ 1,153,186
Non-deductible items and other permanent differences |  |  | 8,693 | 11,908 | 8,095
Gain on business combination |  |  |  |  | (2,108,760)
impairment of Goodwill |  |  |  |  | 1,415,729
Annual adjustment for tax inflation |  |  | (2,406) | (10,974) | (10,924)
Temporary differences |  |  | (249,336) | (91,928) | (56,156)
Recognition of deferred income tax at the Huatulco Airport | [1] |  |  | 44,020 |
Initial recognition for deferred IT consolidation in Aerostar |  |  | 28,678 |  |
Initial recognition for IT consolidation in Airplan |  |  | 10,214 |  |
Other |  |  | (3,137) | (1,056) | 662
IT provision |  |  | $ (1,635,447) | $ (1,401,184) | $ (1,094,863)
Effective ISR rate |  |  | 19.00% | 29.00% | 28.00%
Tax rate effect of tax losses | [1] |  | 3.00% |  |
[1] | (1) Based on the tax projections at December 31, 2016, the Huatulco Airport is expected to pay income tax in the future. Accordingly, the Company decided to recognize deferred income tax. This recognition increased the effective rate by 3%.

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