South Korea expat tax guide
Asia · how a foreigner who moves to South Korea is taxed · 2026 · Mixed
If you move to South Korea, you become a tax resident when domicile or 183+ days residence; foreigners up to 5 of last 10 yrs limited on foreign income. As a resident you are taxed on a mixed basis — Residents are generally taxed on worldwide income, but a foreign resident present 5 years or less during the preceding 10 years is taxed only on Korea-source income plus foreign income paid by a Korean entity or remitted to Korea. The top personal income tax rate is 45%. A foreign pension is treated as: Foreign pension of a long-term resident taxed as worldwide income at progressive rates; limited for under-5/10-yr foreigners. South Korea also offers the 19% flat tax for foreign workers regime, which can sharply change this picture. It has a US tax treaty and has a US totalization agreement. Overall it reads as mixed for an inbound mover. General information, not tax advice — verify with South Korea's tax authority.
Source: PwC Worldwide Tax Summaries. Data as of June 2026.
South Korea expat tax at a glance
| Question | South Korea (2026) |
|---|---|
| When you become tax resident | Domicile or 183+ days residence; foreigners up to 5 of last 10 yrs limited on foreign income |
| Residency day-count trigger | 183 days |
| How residents are taxed | Mixed — Residents are generally taxed on worldwide income, but a foreign resident present 5 years or less during the preceding 10 years is taxed only on Korea-source income plus foreign income paid by a Korean entity or remitted to Korea. |
| Top personal income tax rate | 45% |
| Foreign pension treatment | Foreign pension of a long-term resident taxed as worldwide income at progressive rates; limited for under-5/10-yr foreigners |
| Foreign capital gains / dividends | Foreign capital gains/dividends taxed worldwide for residents 5+/10 yrs; for under-5/10-yr foreigners only if paid by a Korean entity or remitted |
| Special expat / non-dom / retiree regime | 19% flat tax for foreign workers |
| US income tax treaty | Yes |
| US social-security totalization | Yes |
Source: PwC Worldwide Tax Summaries. Data as of June 2026.
Compiled from the primary source for South Korea, cross-checked against PwC Worldwide Tax Summaries, the OECD, the IRS US-treaty list and the SSA totalization list. Rules change — confirm with the official tax authority. This is not tax advice.
What this means if you relocate to South Korea
The first thing that matters is tax residency: domicile or 183+ days residence; foreigners up to 5 of last 10 yrs limited on foreign income. The 183-day line is the headline trigger, but a home, family or business ties can make you resident sooner — so counting days alone is risky.
Once resident, South Korea taxes your worldwide income, so income earned abroad is in scope unless a treaty or special regime says otherwise. The top 45% rate only bites at the highest income band — an average earner pays less.
Foreign pensions and investments
Foreign pension: Foreign pension of a long-term resident taxed as worldwide income at progressive rates; limited for under-5/10-yr foreigners. Foreign capital gains and dividends: Foreign capital gains/dividends taxed worldwide for residents 5+/10 yrs; for under-5/10-yr foreigners only if paid by a Korean entity or remitted. These outcomes can be overridden by a double-tax treaty, which decides whether the source country or South Korea taxes each stream — a key reason retirees should map their specific income against the relevant treaty.
The 19% flat tax for foreign workers regime
Foreign employees who start work in Korea by 31 Dec 2026 may elect a flat 19% rate (plus 10% local surtax, about 20.9%) on Korean-source employment income instead of the 6-45% progressive scale, for up to 20 years from the first work day.
Special regimes have eligibility tests, time limits and sunset dates that change frequently. Treat the summary above as a starting point and verify the current terms with South Korea's tax authority before relying on it.
US citizens and social security in South Korea
| Question | South Korea |
|---|---|
| US income tax treaty? | Yes |
| US social-security totalization agreement? | Yes |
| Tax basis for residents | Mixed |
| Top personal income tax | 45% |
A US tax treaty with South Korea helps reassign taxing rights and reduce withholding, and US citizens lean on the Foreign Earned Income Exclusion and Foreign Tax Credit to avoid double income tax. A totalization agreement means you generally pay social-security contributions to only one of the two countries. See our guides on FEIE vs the Foreign Tax Credit and totalization agreements.
Countries with a similar expat-tax profile to South Korea
| Country | Tax basis | Top income tax | Special regime |
|---|---|---|---|
| South Korea (this country) | Mixed | 45% | 19% flat tax for foreign workers |
| United Kingdom | Mixed | 45% | 4-year Foreign Income and Gains (FIG) regime |
| Japan | Mixed | 45% | Non-permanent resident remittance basis |
| Estonia | Worldwide | 22% | None |
| Czech Republic | Worldwide | 23% | None |
| Croatia | Worldwide | 33% | Returning-emigrant 5-year exemption |
Frequently asked questions
When do you become a tax resident of South Korea?
Domicile or 183+ days residence; foreigners up to 5 of last 10 yrs limited on foreign income. The headline trigger is 183 days. Once resident, South Korea taxes you on income on a basis that depends on your status (see the profile). This is general information for 2026, not tax advice — verify with the official authority.
How does South Korea tax a foreign pension?
Foreign pension of a long-term resident taxed as worldwide income at progressive rates; limited for under-5/10-yr foreigners. Tax treaties can reassign who taxes a pension, so the outcome depends on your nationality and the source country. Confirm with a cross-border adviser before relying on this.
What is the 19% flat tax for foreign workers regime in South Korea?
Foreign employees who start work in Korea by 31 Dec 2026 may elect a flat 19% rate (plus 10% local surtax, about 20.9%) on Korean-source employment income instead of the 6-45% progressive scale, for up to 20 years from the first work day. It is a headline summary for 2026; conditions and sunset dates change, so verify the current rules with South Korea's tax authority.
Is South Korea good for US citizens or retirees?
South Korea has a US income tax treaty and has a US social-security totalization agreement. The totalization agreement means you generally pay social-security contributions to only one country. US citizens are taxed on worldwide income wherever they live, but the Foreign Earned Income Exclusion and Foreign Tax Credit usually prevent double income tax. Not tax advice.
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Sources & accuracy
Profile for South Korea compiled from its primary source, cross-checked with PwC Worldwide Tax Summaries, the OECD, the IRS US-treaty list and the SSA totalization list. Top rate 45% on taxable income over KRW 1 billion (plus 10% local income surtax, 49.5% combined). US tax treaty and US-Korea totalization both in force. Data as of June 2026 (2026 position). This page is general information, not tax advice — tax residency and special regimes are fact-specific and change often, so verify with South Korea's official tax authority and a qualified cross-border adviser before acting. See our methodology and disclaimer.
Last updated: 2026-06-21