South Korea Company Filing Deadlines
- Roger Pay
- Apr 5
- 4 min read
South Korea Company Filing Deadlines
In South Korea, company filing deadlines are primarily dictated by the end of your fiscal year. For the majority of companies operating on a calendar year-end (December 31), several key deadlines fall in the first half of the year.
As of April 2026, here are the standard filing requirements and upcoming deadlines:
1. Corporate Income Tax (CIT)
Annual Return: Must be filed and paid within 3 months of the fiscal year-end.
For Dec 31 year-end: The deadline was March 31, 2026.
Consolidated Returns: The deadline is extended to 4 months (April 30, 2026).
Interim Return: Required for the first 6 months of the fiscal year, due within 2 months of the interim period's end.
For Dec 31 year-end: Due by August 31, 2026.
2. Local Income Tax
Filing Deadline: Generally due within 1 month after the CIT deadline (4 months after the fiscal year-end).
For Dec 31 year-end: Due by April 30, 2026.
2026 Relief Note: There is an automatic 3-month extension (to July 31, 2026) for certain export-oriented SMEs and companies in sectors like shipbuilding and petrochemicals due to current economic conditions.
3. Value-Added Tax (VAT)
VAT is typically filed quarterly for corporations:
Quarter | Period Covered | Filing & Payment Deadline |
Q1 | Jan 1 – Mar 31 | April 25 |
Q2 | Apr 1 – Jun 30 | July 25 |
Q3 | Jul 1 – Sep 30 | October 25 |
Q4 | Oct 1 – Dec 31 | January 25 (following year) |
4. Statutory Audit & Annual Reports
External Audit: If your company meets certain thresholds (e.g., assets > KRW 50 billion or specific revenue/debt combos), an audit report must typically be submitted to the Securities & Futures Commission.
Filing Extension: If an external audit is delayed, you can request a 1-month extension for tax filing, though this usually incurs interest (approx. 3.1% p.a.).
5. Other Key Compliance Dates
Withholding Tax: Must be reported and paid by the 10th of the following month after the payment was made.
Pillar Two (Global Minimum Tax): For large multinational groups, the official filing deadline for the new "GloBE" rules is June 30, 2026.
Country-by-Country (CbC) Reporting: Notification is generally due within 6 months of the fiscal year-end (June 30 for calendar-year companies).
Note: Penalties for late filing can range from 10% to 60% of the tax due, depending on whether the omission was accidental or deemed fraudulent. For SMEs with tax liabilities between KRW 10M and 20M, installment payments are available, allowing the excess over 10M to be paid up to 2 months after the initial deadline.
How Bestar South Korea can Help
Bestar South Korea provides a comprehensive, "one-stop-shop" service model designed to help SMEs and multinational corporations navigate the specific regulatory environment of South Korea.
By integrating traditional professional services with advanced AI-driven tools, Bestar assists with everything from initial market entry to ongoing statutory compliance.
1. Market Entry & Company Incorporation
Bestar streamlines the process of establishing a legal presence in South Korea, managing the bureaucratic hurdles required for foreign entities:
Entity Selection: Advisory on the most tax-efficient structure, such as a Subsidiary (Chusik Hoesa), Branch Office, or Liaison Office.
Foreign Direct Investment (FDI): Handling the mandatory FDI declarations under the Foreign Investment Promotion Act (FIPA), including the KRW 100 million investment threshold for D-8 visas.
Banking & AML Compliance: Assisting with "Source of Wealth" documentation and Anti-Money Laundering (AML) protocols required by Korean banks.
Registration: Managing Hangeul (Korean) corporate name registration and the official corporate seal (Do-jang) application.
2. Tax & Statutory Compliance
To ensure you meet the deadlines mentioned previously, Bestar provides integrated tax and accounting support:
Corporate & Local Tax: Preparation and filing of annual Corporate Income Tax (CIT) and Local Income Tax returns, including consolidated returns for groups.
VAT Management: Quarterly VAT filing and issuance of electronic tax invoices via the National Tax Service (NTS) Hometax system.
Transfer Pricing & BEPS: Advisory on cross-border tax optimization and compliance with Pillar Two (Global Minimum Tax) requirements for larger groups.
Fixed-Fee Model: Bestar typically operates on a transparent fixed-fee basis to provide billing certainty for compliance packages.
3. AI-Powered Audit & Accounting
Bestar differentiates itself by moving away from traditional manual sampling:
100% Population Testing: Utilizing AI to review every transaction in your ledger rather than just a 5–10% sample, which helps identify tax-saving opportunities and anomalies more accurately.
Cloud-Native Solutions: As a Xero Partner, Bestar provides digital bookkeeping and real-time cash flow monitoring, allowing for 100% paperless execution.
Statutory Audits: Providing expedited 30-day turnarounds for statutory audits, which is critical for companies seeking VC funding or bank loans.
4. HR, Payroll & Corporate Secretarial
Payroll Outsourcing: Managing monthly payroll, social security contributions (Four National Insurances), and year-end settlement for employees.
Corporate Secretarial: While a resident company secretary isn't strictly mandatory in Korea, Bestar acts as your compliance partner to maintain statutory records, draft board resolutions, and report material changes to the Commercial Registry.
Work Visas: Facilitating D-8 (Investor) and D-9 (International Trade) visa applications for foreign management and staff.
Comparison of Service Delivery
Feature | Traditional Firms | Bestar South Korea |
Audit Method | Manual Sampling (5-10%) | AI 100% Population Testing |
Turnaround | 60–90 Days | 30-Day Guarantee |
Platform | Paper-based/Legacy | Cloud-Native (Xero/QuickBooks) |
Pricing | Hourly/Variable | Fixed-Fee Packages |
Ready to streamline your operations in South Korea? Whether you are navigating upcoming tax deadlines or planning a new market entry, Bestar provides the local expertise and "one-stop" support you need to remain compliant and competitive.
Get Started with Bestar Today
Book a Consultation: Discuss your South Korean expansion or compliance needs with our expert team.
Request a Quote: Receive a transparent, fixed-fee proposal for accounting, tax, or incorporation services.
Digital Audit Transition: Learn how our AI-driven 100% population testing can provide deeper insights than traditional sampling.
Contact Information
Channel | Details |
admin at bestar-asia.com | |
+65 8836 4489 | |
Phone (Singapore HQ) | +65 6299 4730 |
bestar-cn | |
Locations | Singapore, Hong Kong, Malaysia, UAE, and representative support in South Korea |
Office Hours: Monday – Friday, 9:00 AM – 6:00 PM (SGT)
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