K-GAAP or K-IFRS? Choosing the accounting framework for your Korean subsidiary's statutory audit

By Yonghyeon You, CPA · 2026-11-14

When a foreign group's Korean subsidiary becomes subject to a statutory audit, one of the first questions from HQ is: which accounting framework should the Korean financial statements use?

HQ often assumes the answer is "the same as the group" — IFRS or US GAAP. In practice, for most foreign-owned subsidiaries the cheapest and simplest answer is different: keep the Korean statutory accounts under K-GAAP, and convert to the group's framework in the reporting package.

Short answer: if your Korean subsidiary is not listed, it can usually be audited under K-GAAP (Korean GAAP for non-listed entities). It then prepares a group reporting package under US GAAP or IFRS. Use K-IFRS for the statutory audit only when Korean rules require it (for example, listed companies) or when your group auditor specifically asks for it.

The frameworks in play

Common situations

1. US parent, Korean subsidiary subject to statutory audit (not listed)

• Statutory audit in Korea: K-GAAP
• Group reporting: convert K-GAAP → US GAAP in the reporting package

This is the most common setup I see. The Korean auditor audits K-GAAP accounts; the group auditor works from the US GAAP package.

2. US parent, Korean subsidiary that is itself listed in Korea

• Statutory audit in Korea: K-IFRS (required for listed companies)
• Group reporting: convert K-IFRS → US GAAP

Less common, but it happens — and the conversion is usually more involved because the local accounts already carry IFRS-style judgments that need to be mapped to US GAAP.

3. IFRS parent (e.g. European or Asian group), Korean subsidiary subject to statutory audit

• Statutory audit in Korea: usually K-GAAP
• Group reporting: convert K-GAAP → IFRS in the group package

It is tempting to adopt K-IFRS locally "because the group uses IFRS". It is rarely necessary — and it usually costs more (see below).

Why K-GAAP is usually cheaper

1. Audit fees are typically higher under K-IFRS. K-IFRS standards are more complex and require more disclosures and judgment-heavy areas (leases, revenue, financial instruments, impairment). In my experience, Korean auditors price that extra work into the fee.

2. Tax adjustments are often simpler. Korean corporate tax computations start from the statutory accounts. Under K-GAAP, the book-to-tax adjustments are frequently more straightforward than under K-IFRS.

3. Small and medium-sized entity simplifications. K-GAAP includes special simplifications for qualifying small and medium-sized non-listed companies — for example, recognising income tax expense at the amount payable rather than applying full deferred tax accounting. One caveat: a Korean subsidiary owned by a large foreign group often does not qualify as an SME under Korean law, because the parent's size is taken into account. Check eligibility before relying on these simplifications.

4. The conversion work is needed anyway. Whatever framework the Korean accounts use, HQ will still need a package on group policies, group chart of accounts and group timetable. Choosing K-IFRS locally does not remove that work — it just makes the local audit more expensive.

When K-IFRS makes sense

• The Korean entity is listed, or preparing to list, in Korea (K-IFRS is then required).
• The entity is a financial institution subject to K-IFRS.
• The group auditor explicitly requires local accounts under K-IFRS, for example to rely on the local audit work directly.
• The group plans a Korean IPO or a sale to a buyer that will require K-IFRS financial statements.

If none of these apply, K-GAAP plus a well-built conversion to the group framework is usually the most cost-effective set-up. And because switching frameworks later has its own costs and restrictions, it is worth getting this decision right in the first audit year.

A practical set-up for HQ

1. Keep the Korean statutory accounts in K-GAAP (unless one of the cases above applies).
2. Build a standing GAAP conversion schedule — the same adjustments roll forward each year (leases, revenue timing, provisions, deferred tax, etc.).
3. Agree the conversion approach with both the Korean auditor and the group auditor before year-end.
4. Map the Korean chart of accounts to the group chart of accounts once, so the monthly package becomes routine.

I have worked on conversions in both directions — K-GAAP and K-IFRS to US GAAP and IFRS, and US GAAP to K-IFRS for a Korean parent's consolidation — so if you're deciding how to set up a Korean subsidiary's reporting, a short conversation usually settles it.

This article is general information based on Korean practice as of November 2026, not advice for a specific company. Requirements depend on the entity's listing status, industry and group structure.