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Significant commitments and contingencies
 12 Months Ended
Dec. 31, 2019
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Significant commitments and contingencies
29.
Significant commitments and contingencies
Operating leases commitments
Prior to 2019
ChipMOS Taiwan entered into several operating lease contracts for land. These renewable operating leases will expire by 2032 and 2034.
ChipMOS USA entered into several operating lease contracts for office space. These renewable operating leases will expire by 2019 and 2020.
Future minimum lease obligation payable under those leases are as follows:
 
   
December 31,
2018
 
   
NT$000
 
Within 1 year
   68,631 
1 to 5 years
   140,137 
Over 5 years
   111,446 
  
 
 
 
  
 
320,214
 
  
 
 
 
Capital commitments
Capital expenditures that are contracted for, but not provided for are as follows:
 
   
December 31,
2018
   
December 31,
2019
 
   
NT$000
   
NT$000
 
Property, plant and equipment
   2,508,797    1,640,712 
  
 
 
   
 
 
 
Other commitments
A letter of guarantee was issued by the Bank of Taiwan to the Customs Administration of the Ministry of Finance for making payment of customs-duty deposits when importing. As of December 31, 2018 and 2019, the amounts of NT$97,500 thousand and NT$100,800 thousand, respectively, were guaranteed by Bank of Taiwan.