How Korean Tax Residency Works for Foreign Workers

If your Korean payslip shows tax withheld, or a friend back home asks whether you now owe taxes in two countries, the answer starts with one question: are you a tax resident of Korea? Korean tax residency generally depends on whether Korea is your domicile or whether you stay 183 days or more in a tax year, and it decides how much of your income Korea can tax. Many foreign workers never check their status until a refund or a bill forces the question.

Here is how the test works, what changes if you are a resident, and what to do about income earned outside Korea. This is general information, not tax advice. Rules and thresholds change, so confirm your situation with the National Tax Service or a tax accountant.

The Quick Answer: Resident vs. Non-Resident

• Resident: someone who has a domicile in Korea or has lived in Korea for 183 days or more in a tax year. Residents are generally taxed on income from anywhere in the world, with a special rule for some foreigners (explained below).
• Non-resident: someone who fails both tests. Non-residents are taxed only on Korean-source income, often through withholding.

The tax year is the calendar year, January 1 to December 31, so your status is assessed year by year and can change.

How the Two Tests Actually Work

The domicile test looks at where your life is centered. A job that normally requires you to stay in Korea for a year or longer, or family and assets based in Korea, points toward domicile. In practice, if you arrive on a work visa with a contract of a year or more, you are usually treated as a resident from the day you arrive, not only after 183 days.

The 183-day test matters most when the domicile test is unclear: short assignments, remote workers, students, and people who split time between countries. If you arrive in October without a job that is expected to last a year, you may fall short of 183 days in that first calendar year and cross the line in the next.

To count your days accurately, use immigration records rather than memory. You can request an entry and exit record certificate (출입국사실증명서) from an immigration office, and in many cases online. Keep it with your tax documents.

What Residents Are Taxed On

• Korean income: your salary, freelance income, and rent are taxed as covered in the year-end settlement and Hometax guides.
• Foreign income: in principle, residents are taxed on income earned anywhere, including foreign salary, rental income, interest, and dividends.
• A special rule for newer foreign residents: foreign nationals who have been residents for five years or less in the past ten years are generally taxed on foreign-source income only when it is paid in Korea or brought into Korea. After that, the advantage generally ends. Check the current wording of this rule with a tax professional, because how you count the years and what counts as "remitted" can be technical.

What Non-Residents Are Taxed On

Non-residents generally pay tax only on Korean-source income, usually through withholding at set rates, and the deductions available to them are more limited. A foreign contractor who works in Korea for a short project may fall into this category.

Tax Treaties and Your Home Country

Korea has tax treaties with many countries. They can settle the question when two countries both consider you a resident, using tie-breaker rules such as where your permanent home and closest personal and economic ties are. They can also reduce double taxation through credits or exemptions.

Do not stop at the Korean side. Some countries tax their citizens on worldwide income wherever they live, so you may still have a filing obligation at home, with a credit for tax you paid in Korea. Check your home country's rules separately.

Reporting Foreign Bank Accounts

If you are a Korean tax resident and your foreign financial accounts held a combined balance above roughly 500 million KRW on the last day of any month during the year, you generally have to report those accounts to the tax authority, with a filing window in June of the following year. Failing to report can bring heavy penalties, so confirm the current threshold and rules if your savings abroad are substantial.

Steps to Take

1. Count your days in Korea for each calendar year and get your entry and exit record.
2. Check your visa and contract length, since a year-plus job usually points to residency from arrival.
3. Ask HR how payroll treats you, and whether you are being withheld as a resident.
4. List your foreign income and accounts, including rent, dividends, interest, and any foreign employer income.
5. Check the treaty between Korea and your home country and your home country's filing rules.
6. Book an accountant if foreign income is involved, since the remittance and reporting rules are where errors happen.

Common Mistakes

• Treating 183 days as the only test. The domicile test often applies first.
• Ignoring foreign income. Residents may have to report it even if it never touches a Korean account.
• Forgetting home-country filing. Citizenship-based systems can still apply.
• Not keeping travel records. Disputes about days are easier to settle with documents.
• Assuming your status never changes. It is reassessed each year.

Quick Summary

• In 2026, Korean tax residency generally depends on having a domicile in Korea or staying 183 days or more in a calendar year.
• Residents are taxed on worldwide income, though newer foreign residents are often taxed on foreign-source income only when it is paid or sent to Korea.
• Treaties and your home country's rules can change the outcome, so check both sides and keep your entry and exit records.
• Residents with large foreign accounts may need to report them, so confirm current thresholds and get professional help if foreign income is involved.