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Accounts receivable
 12 Months Ended
Dec. 31, 2021
Text block [abstract]  
Accounts receivable
 
9.
Accounts receivable
 
     
                    
      
                    
  
    
December 31,

2020
     
December 31,

2021
  
    
NT$000
     
NT$000
  
Accounts receivable
   
 
5,365,776
 
   
 
6,346,156
 
Less: Loss allowance
   
 
(1,620
) 
   
 
(1,910
) 
    
 
 
     
 
 
  
    
 
5,364,156
 
   
 
6,344,246
 
    
 
 
     
 
 
  
 
  a)
The Group’s credit term granted to customers is 30~90 days. Receivables do not bear interest. The loss allowance is determined based on the credit quality of customers. Information relating to credit risk is provided in Note 43.
 
  b)
The aging analysis of accounts receivable based on past due date are as follows:
 
    
December 31,

2020
     
December 31,

2021
  
    
NT$000
     
NT$000
  
Current
      5,272,208        6,327,791  
Within 1 month
      93,568        18,365  
    
 
 
     
 
 
  
    
 
5,365,776
 
   
 
6,346,156
 
    
 
 
     
 
 
  
 
  c)
As of December 31, 2020 and 2021, accounts receivable were all from contracts with customers. And as of January 1, 2020, the balance of accounts receivable from contracts with customers was NT$4,452,904 thousand.
 
  d)
Without taking into account of any collateral held or other credit enhancements, the amount that best reflects the Group’s maximum exposure to credit risk in respect of the accounts receivable is the carrying amount at the end of each reporting period.
 
  e)
No accounts receivable of the Group were pledged to others.