This article was displayed on the ChosunBiz RM Report site at 10:10 p.m. on Aug. 26, 2026.
KCC was said on the 26th to be undergoing a National Tax Service "special tax audit." The audit came as the National Tax Service began a large-scale, targeted probe into allegations that corporate real estate titled under corporations is being privately used by Oner families.
According to ChosunBiz's reporting, the Seoul Regional Tax Service's Investigation Bureau 4 sent a Researcher to KCC headquarters on the 25th to secure books related to tax and accounting. Investigation Bureau 4 is in charge of special tax audits. It handles major tax evasion cases of large corporations and is sometimes called "the mid-level investigative unit of the National Tax Service" and "the grim reaper of corporations." Regarding this tax audit, a KCC official said, "It is difficult to confirm the relevant details."
The tax audit of KCC took place on the day the National Tax Service said it would investigate allegations that 50 corporations' Oner families privately used real estate titled under corporations. According to the National Tax Service, 5 large corporations are said to be among the 50 corporations.
Earlier, allegations arose that the KCC Oner family was privately using a dwelling titled under a corporation that it owns around Hannam-dong in Yongsan-gu, Seoul. In 2012, KCC purchased land in Hannam-dong in two transactions for 13.5 billion won. After that, in 2014, Honorary Chairman Jeong Sang-young, who is deceased, and second son Jeong Mong-ik, chairman of KCC Glass, jointly purchased part of the land from KCC and split the equity.
In 2015, the two individuals and KCC each built one single-family dwelling on the land they owned, one under a personal name and one under a corporate name. However, because the two dwellings share the same entrance and there is no wall installed between them, suspicions arose that the owner family was using the space as a private area.
Before this audit, the National Tax Service reportedly conducted a preliminary review, including requesting KCC to submit materials related to corporate tax. KCC told ChosunBiz that it received a notice of no charges in that review. On this, a tax accountant who previously worked at the National Tax Service said, "If a no-charge finding came out in the preliminary review but an on-site audit was launched, it can be seen that the National Tax Service judged there was a separate aspect to clarify."