Korea Income Tax Filing for Foreigners: Complete Guide (2026)
Foreign nationals earning income in Korea are required to pay Korean income tax. Foreigners benefit from special provisions unavailable to Korean nationals — such as a flat 19% tax rate option and tax treaty exemptions. Understanding the rules helps you avoid overpaying and take full advantage of legal deductions.
Table of Contents
- 1. Tax Obligations for Foreigners
- 2. Resident vs. Non-Resident Status
- 3. Withholding Tax on Employment Income
- 4. The 19% Flat Tax Rate Option for Foreigners
- 5. Comprehensive Income Tax Filing (May)
- 6. Tax Treaty Benefits
- 7. Year-End Tax Settlement for Foreign Workers
- 8. Rental and Business Income
- 9. Avoiding Double Taxation: Foreign Tax Credit
- 10. Frequently Asked Questions
- 11. Consultation
1. Tax Obligations for Foreigners {#section-1}
Foreign nationals earning income in Korea are subject to Korean income tax based on their residency status and the type of income earned.
| Category | Taxable Income |
|---|---|
| Resident foreigners | All worldwide income |
| Non-resident foreigners | Korean-source income only |
2. Resident vs. Non-Resident Status {#section-2}
Your residency status for tax purposes determines the scope of your tax obligations.
| Status | Criteria |
|---|---|
| Resident | Has a domicile in Korea, or has stayed 183+ days in Korea in a year |
| Non-resident | No Korean domicile and fewer than 183 days in Korea |
The 183-Day Rule
If you stay in Korea for 183 or more days in a given tax year, you are classified as a tax resident and are subject to Korean income tax on your worldwide income.
3. Withholding Tax on Employment Income {#section-3}
Foreign employees at Korean companies have income tax withheld from their monthly salary.
| Item | Details |
|---|---|
| Method | Simplified tax table (same as Korean employees) |
| Timing | Monthly, at the time of salary payment |
| Tax rate | Progressive 6–45% based on income bracket |
| Local income tax | Additional 10% of income tax |
2026 Income Tax Brackets
| Taxable Income | Tax Rate |
|---|---|
| Up to KRW 14 million | 6% |
| KRW 14M – 50M | 15% |
| KRW 50M – 88M | 24% |
| KRW 88M – 150M | 35% |
| KRW 150M – 300M | 38% |
| KRW 300M – 500M | 40% |
| Over KRW 500M | 42% |
| Over KRW 1 billion | 45% |
4. The 19% Flat Tax Rate Option for Foreigners {#section-4}
Foreign workers can elect to pay a flat 19% tax rate on their employment income (excluding local income tax) for up to 20 years from their first entry into Korea.
| Item | Details |
|---|---|
| Rate | Flat 19% on employment income |
| Eligibility period | Up to 20 years from first entry into Korea |
| When to elect | At year-end tax settlement or May income tax filing |
| Deductions | No income deductions apply (flat rate only) |
When the Flat Rate Is Advantageous
- High earners where progressive rates exceed 19%
- Workers with few deductible expenses
You can compare the flat rate against progressive taxation each year and choose whichever results in lower tax.
5. Comprehensive Income Tax Filing (May) {#section-5}
The annual comprehensive income tax filing takes place every year from May 1–31.
| Who Must File | Situation |
|---|---|
| Additional income beyond employment | Interest, dividends, business income, rental income, etc. |
| Worked at 2+ employers | Must aggregate all income |
| No year-end settlement done | Must file directly |
| Freelancers and business owners | Must file business income |
How to File
| Method | Details |
|---|---|
| NTS Hometax (www.hometax.go.kr) | Online filing — available to foreigners |
| Visit local tax office | In-person filing |
| Tax accountant | Recommended for complex situations |
Required Documents
- Withholding tax receipt (근로소득 원천징수 영수증)
- Financial income details (interest, dividends)
- Lease agreements (if rental income)
- Business income/expense records (if business income)
6. Tax Treaty Benefits {#section-6}
Korea has tax treaties with approximately 90 countries. Under these treaties, certain types of income may be taxed at reduced rates or exempted entirely.
Key Treaty Benefits by Income Type
| Income Type | Example Treaty Benefit |
|---|---|
| Employment income | Short-term dispatched workers may be exempt (e.g., under 183 days) |
| Business income | No Korean tax if no permanent establishment in Korea |
| Dividends | Reduced withholding (typically 5–15%) |
| Interest | Reduced withholding (typically 0–10%) |
| Royalties | Reduced withholding |
Sample Withholding Rates Under Key Treaties (Non-Employment Income)
| Country | Dividend Rate | Interest Rate |
|---|---|---|
| USA | 15% | 12% |
| China | 10% | 10% |
| Japan | 15% | 10% |
| Germany | 15% | 10% |
To claim treaty benefits, submit a tax treaty application and a certificate of residence from your home country to the Korean tax office or the income payer.
7. Year-End Tax Settlement for Foreign Workers {#section-7}
The year-end tax settlement (연말정산) process runs from January to February each year and applies to foreign workers as well.
| Item | Details |
|---|---|
| Timing | January–February (processed through your employer) |
| Deduction items | Personal deductions, medical expenses, education, insurance, donations |
| Foreign-specific note | Some deductions (e.g., monthly rent credit) are conditionally available |
| Flat rate election | Can elect the 19% flat rate during settlement |
Key Deductions Available to Foreign Workers
| Deduction | Condition |
|---|---|
| Basic personal deduction (self) | KRW 1.5 million (always available) |
| Spouse deduction | If spouse is in Korea |
| Medical expense credit | Korean medical costs |
| Education expense credit | Korean school tuition for children |
| Insurance premium deduction | Korean insurance policies |
8. Rental and Business Income {#section-8}
Foreigners with rental or business income in Korea must file a comprehensive income tax return in May.
| Income Type | Filing | Tax Rate |
|---|---|---|
| Residential rental (under KRW 20M/year) | May tax return | Separate 14% or aggregate |
| Residential rental (over KRW 20M/year) | Aggregate income return | Progressive 6–45% |
| Business income | May tax return | Progressive 6–45% |
| Freelance income | May tax return | Progressive 6–45% |
9. Avoiding Double Taxation: Foreign Tax Credit {#section-9}
Resident foreigners who pay tax in both Korea and their home country can claim a foreign tax credit to avoid double taxation.
| Item | Details |
|---|---|
| Foreign tax credit | Credits tax paid abroad against Korean tax liability |
| Eligibility | Tax residents filing worldwide income |
| Credit limit | Limited to the Korean tax attributable to the foreign-source income |
| How to apply | Attach the foreign tax credit statement when filing in May |
10. Frequently Asked Questions {#section-10}
Q. Do all foreigners need to file a comprehensive income tax return? A. If you have only employment income from one employer and year-end settlement was completed, no separate filing is needed. However, if you have freelance, rental, dividend, or interest income, you must file in May.
Q. Is the 19% flat rate always better? A. Not necessarily. If your income is modest or you have many deductions, the progressive rate may result in lower tax. Compare both options each year.
Q. Do foreigners who stay under 183 days still owe taxes? A. Non-residents pay tax only on Korean-source income. Tax treaty provisions may further reduce or eliminate the tax depending on your home country.
Q. How do I claim a tax treaty benefit? A. Submit a tax treaty application form and your home country certificate of tax residence to the Korean tax authority or the income payer (employer, bank, etc.).
Q. Do I need to clear taxes before leaving Korea? A. If you have outstanding unpaid taxes, you should settle them before departure. Unpaid taxes can lead to departure restrictions.
11. Consultation {#section-11}
Korean income tax for foreigners involves residency determination, treaty applications, flat-rate elections, and double-taxation issues — all of which interact with each other. Professional guidance from a tax specialist ensures accurate filing and maximum legal savings.
Vision Administrative Office provides basic guidance on foreign national residency and tax obligations, and connects clients with qualified tax accountants for detailed filings.
Free consultation: 02-363-2251
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