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Income tax - Income tax rates (Details) - MXN ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income tax |  |  |
Corporate income tax rate | 30.00% | 30.00% | 30.00%
Employee wages and benefits tax deductible (as a percent) | 47.00% |  |
Withholding tax on dividends distributions (as a percent) | 10.00% |  |
Consolidated basis tax income | $ 302,029 | $ 938,304 | $ 777,513
Maximum |  |  |
Income tax |  |  |
Employee wages and benefits tax deductible (as a percent) | 53.00% |  |
Guatemala |  |  |
Income tax |  |  |
Corporate income tax rate | 25.00% | 25.00% | 25.00%
Costa Rica |  |  |
Income tax |  |  |
Corporate income tax rate | 30.00% | 30.00% | 30.00%
Period in which tax losses can be carried forward | 3 years |  |
El Salvador |  |  |
Income tax |  |  |
Corporate income tax rate | 30.00% | 30.00% | 30.00%
Mexico |  |  |
Income tax |  |  |
Period in which tax losses can be carried forward | 10 years |  |

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- Definition The applicable income tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2020-01-01 + Details
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