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Income tax incurred and deferred: Reconciliation (Details) - MXN ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2014
Income tax incurred and deferred: |  |  |  |
Consolidated income before IT and joint venture equity method: | $ 7,661,741 | $ 6,916,699 | $ 8,498,889 |
Consolidated income before IT and joint venture equity method: | 7,661,737 | 6,916,699 | 8,386,544 |
Net (loss) income before taxes of Airplan and Aerostar | (843,352) | (297,179) | 16,011 |
Net (loss) income before taxes of subsidiaries in Mexico not subject to IT | (100,793) | (89,685) | (62,327) |
Income before provisions for income taxes | $ 6,717,596 | $ 6,529,835 | $ 8,452,573 |
Statutory IT rate | 30.00% | 30.00% | 30.00% | 30.00%
IT that would result from applying the IT rate to book profit before income taxes | $ 2,015,279 | $ 1,958,951 | $ 2,535,772 |
Non-deductible items and other permanent differences | 11,941 | 15,126 | 8,693 |
Gain on business combination |  |  | (2,108,760) |
Goodwill impairment |  |  | 1,415,729 |
Annual adjustment for tax inflation | (12,783) | 12,101 | (2,406) |
Accounting disconnect inflation | (93,030) | (189,237) | (249,336) |
Initial recognition for deferret IT consolidation in Aerostar | 38,579 | 33,879 | 28,678 |
Other non-taxable earnings |  | (17,742) | (3,137) |
IT provision | $ 1,978,102 | $ 1,795,961 | $ 1,635,447 |
Effective IT rate | 29.00% | 28.00% | 19.00% |

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