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Cover Page
 12 Months Ended
Dec. 31, 2024
shares
Document Information [Line Items]  
Document Type 20-F
Amendment Flag false
Document Period End Date Dec. 31, 2024
Document Fiscal Year Focus 2024
Document Fiscal Period Focus FY
Entity Registrant Name ChipMOS TECHNOLOGIES INC.
Entity Central Index Key 0001123134
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer No
Entity Current Reporting Status Yes
Entity Filer Category Large Accelerated Filer
Entity Emerging Growth Company false
Entity Shell Company false
Entity Common Stock, Shares Outstanding 727,240,126
Document Annual Report true
Document Transition Report false
Entity Interactive Data Current Yes
Document Shell Company Report false
Entity Incorporation, State or Country Code F5
Document Financial Statement Error Correction [Flag] false
Document Accounting Standard International Financial Reporting Standards
Entity Voluntary Filers No
Entity Address, Address Line One No. 1, R&D Road 1
Entity Address, Address Line Two Hsinchu Science Park
Entity Address, City or Town Hsinchu
Entity Address, Country TW
Entity Address, Postal Zip Code 300-092
ICFR Auditor Attestation Flag true
Auditor Name PricewaterhouseCoopers, Taiwan
Auditor Firm ID 1345
Auditor Location Taipei, Taiwan
Document Registration Statement false
Securities Act File Number 001-37928
Auditor Opinion [Text Block]

Opinions on the Financial Statements and Internal Control over Financial Reporting

We have audited the accompanying consolidated statements of financial position of ChipMOS TECHNOLOGIES INC. and its subsidiaries (the “Group”) as of December 31, 2024 and 2023, and the related consolidated statements of comprehensive income, of changes in equity and of cash flows for each of the three years in the period ended December 31, 2024, including the related notes (collectively referred to as the “consolidated financial statements”). We also have audited the Group’s internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Group as of December 31, 2024 and 2023, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2024 in conformity with IFRS Accounting Standards as issued by the International Accounting Standards Board. Also in our opinion, the Group maintained, in all material respects, effective internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control - Integrated Framework (2013) issued by the COSO.

ADR [member]  
Document Information [Line Items]  
Trading Symbol IMOS
Title of 12(b) Security American Depositary Shares
Security Exchange Name NASDAQ
Ordinary shares [member]  
Document Information [Line Items]  
Title of 12(b) Security Common Shares, par value NT$10 per share
No Trading Symbol Flag true
Security Exchange Name NASDAQ
Business Contact [Member]  
Document Information [Line Items]  
Entity Address, Address Line One No. 1, R&D Road 1
Entity Address, Address Line Two Hsinchu Science Park
Entity Address, City or Town Hsinchu
Entity Address, Country TW
Entity Address, Postal Zip Code 300-092
City Area Code 886
Local Phone Number 3-577-0055
Contact Personnel Name Silvia Su