South Koreas 2025 Tax Reform Proposal (announced on July 31, 2025), provides that a QDMTT will be applied from January 1, 2026.

South Korea’s amendment to the Enforcement Decree No. 35348 of February 28, 2025 and the Decree of the Ministry of Economy and Finance No. 1114 of March 21, 2025 provide for further aspects of the June 2024 OECD Administrative Guidance as well as additional top-up tax forms.

On December 31, 2024, Law No. 20612, was published to amend the International Tax Adjustment Act for the 2025 Tax Reform provisions. This includes some amendments to the Global Minimum Tax provisions.

On July 25, 2024, the Ministry of Economy and Finance issued the 2024 Tax Law Amendment Bill. This includes a number of amendments to the South Korean global minimum tax law to reflect aspects of the OECD Administrative Guidance.

On March 22, 2024, the Decree of the Ministry of Economy and Finance No. 1048, to amend the Enforcement Regulations of the International Tax Adjustment Act entered into force.

On March 22, 2024, the Enforcement Regulations to the International Tax Adjustment Act were amended. This includes attachments for the GIR (in English and Korean), the GloBE Tax Return and the Notification Form for a Foreign CE to File the GIR.

On December 31, 2023, Law 19928 was issued to amend the International Tax Adjustment Act to take account of a number of OECD amendments issued in the Administrative Guidance.