Bookkeeping for Foreign Companies in Korea: A Complete Guide

For foreign companies operating in Korea, bookkeeping is not simply a back-office administrative task — it is a legal obligation, a compliance framework, and the foundation of every tax filing and audit. Korean bookkeeping rules differ significantly from US GAAP, IFRS as adopted in Europe, or Australian accounting standards. This guide gives you a comprehensive overview of what is required, what pitfalls to avoid, and how to build a bookkeeping system that scales.

Korean Accounting Standards: K-IFRS vs K-GAAP

Korea operates a dual-standard framework:

K-IFRS (한국채택국제회계기준)

K-IFRS is Korea’s version of IFRS, mandatory for publicly listed companies and financial institutions. Large unlisted companies may voluntarily adopt K-IFRS, and some foreign parent companies prefer it for consolidation purposes. If your Korean subsidiary is a wholly owned entity of a publicly listed parent, check whether consolidated reporting requirements push you toward K-IFRS adoption.

K-GAAP (일반기업회계기준)

The vast majority of foreign-invested companies in Korea — branch offices, small-to-medium subsidiaries, and limited liability companies — follow K-GAAP. This standard is simpler than K-IFRS and is administered by the Korean Accounting Standards Board (KASB). Key differences from US GAAP and IFRS include stricter revenue recognition rules, different lease accounting treatments, and specific disclosure requirements for related-party transactions.

Legal Bookkeeping Requirements in Korea

Under the Korean Commercial Act and Corporate Tax Act, all registered companies must maintain:

• Double-entry accrual books: Journal entries, general ledger, and trial balance are mandatory. Cash-basis accounting is not acceptable for corporate tax purposes.
• Supporting documentation: Every transaction must be supported by a tax invoice, receipt, contract, or equivalent document. The NTS can disallow deductions if documentation is missing.
• Korean language records: While internal working documents may be bilingual, official accounting books submitted to or reviewed by Korean authorities must be in Korean.
• Five-year retention: All accounting books and source documents must be preserved for a minimum of 5 years from the end of the fiscal year to which they relate.

Chart of Accounts

Korea does not mandate a universal chart of accounts, but K-GAAP prescribes a standard account classification framework. Most Korean accounting software (ERP systems) follows this structure:

• Assets (자산): Current assets, non-current assets, intangible assets
• Liabilities (부채): Current liabilities, long-term liabilities
• Equity (자본): Paid-in capital, retained earnings, other comprehensive income
• Revenue (수익): Operating revenue, non-operating revenue
• Expenses (비용): Cost of goods sold, selling & administrative expenses, non-operating expenses

Foreign companies often make the mistake of importing their home-country chart of accounts directly. This creates mapping difficulties during tax filing, VAT reconciliation, and any future external audit.

VAT Invoice Management

Korea’s electronic tax invoice (전자세금계산서) system is one of the most advanced in the world — and non-compliance is penalized severely. Key rules:

• Mandatory issuance: All VAT-registered businesses must issue e-tax invoices for taxable supplies. Paper invoices are no longer accepted between VAT registrants.
• Issuance deadline: E-tax invoices must be issued by the 10th day of the month following the supply date. Late issuance incurs a 1% penalty on the invoice value.
• Input VAT recovery: Only properly issued and received e-tax invoices qualify for input VAT deduction on your VAT return. Lost or improperly issued invoices cannot be deducted.
• NTS real-time reporting: All e-tax invoices are transmitted to the NTS system in real time, giving tax authorities full visibility into your VAT position.

Practical tip: Designate a dedicated staff member or outsource e-invoice management to your CPA firm. Errors in the invoice system are disproportionately costly.

Payroll Processing

Korea has mandatory social insurance contributions that must be calculated and remitted monthly. The four major schemes are:

• National Health Insurance (건강보험): 7.09% of gross salary, split equally between employer and employee
• National Pension (국민연금): 9% of standard monthly income, split equally
• Employment Insurance (고용보험): 1.8% total; employee pays 0.9%, employer pays 0.9% plus additional 0.25–0.85% depending on company size
• Industrial Accident Insurance (산재보험): 100% employer-funded; rate varies by industry

Income tax withholding (갑종근로소득세) must also be calculated monthly using the NTS withholding tax table and remitted by the 10th of the following month. Year-end payroll settlement (연말정산) in January or February reconciles actual tax liability with amounts withheld throughout the year.

Year-End Closing Procedures

Korean year-end closing (결산) is significantly more rigorous than in many Western jurisdictions. Standard procedures include:

• Inventory count: Physical inventory verification required for manufacturing and retail companies
• Accounts receivable aging: Bad debt provisions must meet specific NTS allowable criteria
• Fixed asset register reconciliation: Korea has strict rules on depreciation methods and useful life schedules
• Intercompany reconciliation: Related-party balances must tie out and be documented for transfer pricing compliance
• Accrual review: Accrued expenses must be documented to be deductible; estimated provisions without underlying documentation are frequently disallowed
• Tax adjustment workpaper: K-GAAP net income must be adjusted to taxable income via a formal tax reconciliation schedule (세무조정계산서)

Common Mistakes Foreign Companies Make

Based on experience with foreign-invested companies, the following errors are most frequently encountered:

• Using a non-Korean accounting system without Korean localization: QuickBooks or Xero without Korean chart-of-accounts configuration creates irreconcilable gaps during tax filing
• Missing e-tax invoice deadlines: Input VAT lost due to late invoices cannot be recovered retroactively in most cases
• Treating all expenses as deductible: Korean tax law has specific non-deductible categories — entertainment expenses above threshold, fines, penalties, and certain shareholder-related payments
• Failing to document related-party transactions: Any payment to a foreign parent, affiliate, or related person requires arm’s-length pricing documentation
• Payroll errors: Incorrect social insurance calculation leads to year-end audits by the National Health Insurance Service and NPS
• Inadequate support documentation: Korean tax auditors expect comprehensive documentation; a well-meaning “it’s standard practice” explanation is not acceptable

Building a sound bookkeeping function from the outset — with Korean accounting standards, a properly configured chart of accounts, and rigorous documentation habits — is the single most effective investment a foreign company can make in Korea compliance.

Need help with bookkeeping for your foreign company in Korea? Contact Bricks Insight for a consultation.

Reference date: 4월 2026 (based on regulations as of this date)