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Income Tax (Tables)
6 Months Ended
Jun. 30, 2021
Text Block [Abstract]  
Summary of Income Tax Expense
  a.
Income tax expense recognized in profit or loss
Income tax expense consisted of the following:
 
    
Six Months Ended June 30
 
    
2020
    
2021
 
    
NT$
    
NT$
 
    
(In Millions)
    
(In Millions)
 
     
Current income tax expense
                 
Current tax expense recognized in the current period
   $ 41,421.1      $ 49,846.5  
Income tax adjustments on prior years
     (7,553.0      (12,748.5
Other income tax adjustments
     (79.5      69.9  
    
 
 
    
 
 
 
       33,788.6        37,167.9  
    
 
 
    
 
 
 
Deferred income tax benefit
                 
The origination and reversal of temporary differences
     (2,580.5      (7,238.3
Investment tax credits
            (2,632.6
    
 
 
    
 
 
 
       (2,580.5      (9,870.9
    
 
 
    
 
 
 
Income tax expense recognized in profit or loss
   $ 31,208.1      $ 27,297.0  
    
 
 
    
 
 
 
Income Tax Expense Recognized in Other Comprehensive Income
  b.
Income tax expense recognized in other comprehensive income
 
    
Six Months Ended June 30
 
    
2020
    
2021
 
    
NT$
    
NT$
 
    
(In Millions)
    
(In Millions)
 
     
Deferred income tax benefit (expense)
                 
Related to unrealized gain/loss on investments in equity instruments at FVTOCI
   $ 0.4      $ (55.8