South Korean National Tax Service

The South Korean National Tax Service functions as South Korea's national tax authority. Its core responsibilities encompass administering and collecting national taxes within the country. This involves processing tax returns, enforcing tax laws and regulations, conducting audits, and managing taxpayer information. The agency handles highly sensitive personal and financial data belonging to South Korean citizens and entities as part of its mandate. Its operational scope is confined to South Korea, serving individuals and businesses operating within the nation's jurisdiction.

As the primary government body for taxation in South Korea, the National Tax Service holds a critical regulatory role in the country's financial infrastructure. Its distinguishing attribute is its custodianship of vast amounts of confidential taxpayer information, making data security paramount. This sensitivity was highlighted in March 2023 when the LockBit ransomware gang claimed a cyberattack against the agency, alleging data exfiltration and threatening public release unless a ransom was paid. While the gang later announced publication, confirmation of actual public release was not immediate. This incident underscored the severe privacy risks associated with a breach of such an agency due to the nature of the personal and financial data it collects and stores. The organisation operates independently as a national government entity headquartered in South Korea.