Korean Tax for Foreigners 2026: Complete Guide to Filing, Deductions & Refunds

KunStudio · K-Wisdom Series · 2026-05-03

Most foreign residents in Korea pay too much tax. Not because the rates are high — Korea's 2026 brackets are competitive — but because key deductions go unclaimed. The 183-day rule: stay in Korea 183+ days in a calendar year (or have a domicile here) and you become a tax resident, subject to Korean tax on global income. Most expats hit residency by year 2.

2026 progressive income tax brackets: Up to ₩14M (6%), ₩14-50M (15% minus ₩840K), ₩50-88M (24% minus ₩6.24M), ₩88-150M (35% minus ₩15.36M), and so on up to 45% over ₩1B. Compared to many Western countries, the middle brackets are reasonable.

The biggest deduction most foreigners miss: the Foreign Engineer 5-Year 50% Reduction (조세특례제한법 18조의2). If you qualify (engineering/scientific/research role for an eligible Korean company), you can reduce income tax by 50% for 5 years. Worth potentially millions of won annually. Application requires employer cooperation and timely filing.

Comprehensive Income Tax (종합소득세) is filed by May 31 — for freelancers, multi-source earners, business owners. Salary-only employees handle this through year-end settlement (연말정산) in February. VAT (부가가치세) for businesses is quarterly. Plan accordingly: Korean tax accountants are typically free during off-season but ₩300-500K for individual filing in May rush.

Hometax (홈택스) is bilingual but the navigation is dense. Our printable PDF guide walks you through the 7 critical steps in English screenshots, with deductions for salary workers vs freelancers vs foreign engineers. Important: This guide is information only — Korean Tax Accountant Law restricts representation to licensed 세무사. Use as a research starting point, then consult a 세무사 for filing decisions.