Korean Income Tax Rates and Flat Tax Option for Foreigners
Korean individual income tax (소득세, Sodeukse) progressive rates (2026): 6% (up to KRW 14,000,000), 15% (14–50M), 24% (50–88M), 35% (88–150M), 38% (150–300M), 40% (300–500M), 42% (500M–1B), 45% (above 1B). Plus Local Income Tax (지방소득세): 10% surtax on income tax payable. Effective top combined rate: 49.5% (45% + 10% of 45% = 4.5%). Foreign workers' flat tax option: foreign nationals working in Korea may elect a flat tax rate of 20.9% (19% + 10% LIT) on Korean employment income — this replaces the progressive rates. Applicable for up to 20 years in Korea (extended from 5 to 20 years by 2023 legislation). Available: only for employment income (salaries, bonuses) — not investment income or business income. Election: made annually when filing the income tax return. Advantageous for: foreign workers earning above approximately KRW 100M/year (where the flat rate is lower than progressive). On departure: in the final year, the flat tax election can still be made for the period of Korean residency — potentially very valuable for high earners.
Korean Exit Tax: Equity Holdings on Departure
South Korea's exit tax (출국세, Chulguk Se) — introduced 2018 — applies to Korean tax residents who hold qualifying equity stakes on departure. Qualifying threshold: (1) You own ≥3% of the total shares of a Korean domestic company; OR (2) Your Korean domestic shares have a market value of ₩1,000,000,000 (approximately $750,000 USD) or more at the time of departure. Exit tax mechanics: on the date of departure, the qualifying shares are deemed disposed at their current market value. The capital gain (market value minus cost basis) is subject to Korean CGT. Korean CGT on domestic shares (대주주 양도소득세): 20% on gains up to KRW 300M; 25% on gains above KRW 300M. Application to foreign nationals: the exit tax applies to Korean tax residents — including foreign nationals who have been Korean tax residents for 5 or more years and meet the share threshold. Foreigners residing in Korea for fewer than 5 consecutive years before departure: exempt from exit tax. DTA relief: if you move to a DTA country, the Korea-DTA may limit Korea's taxation rights on the exit gain — check the specific country's treaty with Korea. Payment: exit tax must be paid within 2 months of departure.
NPS (National Pension Service): Lump Sum Withdrawal for Foreigners
Korea's National Pension Service (국민연금, Gungmin Yeongeum) is a mandatory pension contribution system for employees in Korea. Employee contribution: 4.5% of standard monthly income; employer: 4.5%; self-employed: 9%. Foreign nationals and NPS: most foreign nationals working in Korea on registered employment visas contribute to NPS. However, nationals of countries with Korea NPS totalization agreements may be exempt (list includes USA, Canada, Germany, UK, Japan, China, Australia, France, and others). Lump sum withdrawal (반환일시금, Banwon Ilsigeum): foreign nationals who are permanently leaving Korea and have paid NPS contributions can claim a lump sum refund of their accumulated contributions. Requirements: (1) Not a Korean national. (2) No intention to remain in Korea as a registered resident. (3) Have not yet reached pension age (62). How to claim: apply to the NPS with your departure documentation (departure confirmation, visa cancellation, passport) — in person at an NPS office or via the NPS foreigners' portal. Processing time: approximately 2–4 weeks. Tax on NPS refund: subject to 20% Korean income tax withholding at source on the gain portion (contribution earnings). Contribution principal refunded without tax.
Jeonse Deposit Refund: The Unique Korean Departure Issue
Jeonse (전세) is a uniquely Korean rental system where a tenant pays a large lump-sum deposit (typically 50%–80% of property value) to the landlord instead of monthly rent — the landlord uses the deposit for investment and returns it in full at the end of the lease. For departing residents holding a jeonse deposit: the landlord must return the full deposit at the end of the lease. Departure timing risk: if you need to depart Korea before your jeonse lease ends, the landlord may not return the deposit early. Strategies: (1) Negotiate early termination with the landlord — find a replacement tenant to take over the jeonse, which releases your deposit. (2) Wait until lease expiry — jeonse leases are typically 2 years. (3) Seek legal assistance if the landlord refuses — Korea has strengthened tenant protections for jeonse deposit recovery (Jeonse Deposit Protection Act). Recent jeonse crisis: 2022–2024 jeonse fraud and price drops left many tenants unable to recover deposits from insolvent landlords. Verify the landlord's mortgage situation (등기부등본 property registry) before signing any jeonse contract. Deposit insurance: Jeonse Deposit Protection Insurance (전세보증보험) from HUG (Korea Housing Finance Corporation) covers deposit recovery if the landlord defaults — recommended for all jeonse tenants. Tax on jeonse deposit: the deposit itself is not taxable income. However, imputed rental income rules may apply on large jeonse deposits from the landlord's perspective — not a tenant departure tax issue.
Korean Departure Tax Filing and Final Obligations
Korean income tax year: calendar year. Final return: file the annual income tax return (종합소득세 신고) by May 31 of the following year (or by the departure date if departing mid-year, via a pre-filing request). Employment income only: Korean employers withhold income tax via year-end settlement (연말정산, Yeonmal Jeongsan) — the employer processes this in January of the following year. If departing before year-end: request that your employer process a final settlement before your departure date. Health insurance (건강보험, Geongang Bohŏm): Korean National Health Insurance contributions end on departure. If you have paid premiums in advance: apply for a refund of overpaid premiums from the National Health Insurance Service (NHIS). Employment Insurance (고용보험): similar refund process. Final tax clearance: Korea does not require a formal tax clearance certificate for individuals on departure. However, the tax authority (NTS — National Tax Service) can audit returns for up to 5 years after filing. Ensure all withholding tax receipts and year-end settlement documents are retained. Korean TIN (납세자번호): automatically deactivated on cancellation of alien registration.