Korea's 19% Flat Tax for Foreign Workers — Who Benefits and How to Apply
How the flat 19% income tax option for foreign employees in Korea works in 2026, who is eligible, when it beats the standard tax table, how to apply through your employer, and the proposed change for 2027.
Foreign employees in Korea can choose between the normal progressive income tax and a flat 19% rate (20.9% including local income tax). The flat rate sounds attractive, but for most people it means paying more. Here is how to tell which is better for you.
Who can choose the flat rate
- You are a foreign national employed by a Korean employer (not a daily worker).
- You started working in Korea on or before 31 December 2026.
- You can use it for up to 20 years from the year you first started working in Korea.
- Workers employed by a company with a special relationship to their foreign employer (for example certain related-party arrangements) are excluded.
What the flat rate covers
The 19% applies to your total employment income, including items that are normally tax-free such as the meal allowance. Under the flat rate you cannot claim any deductions or credits: no dependent deductions, no card spending deduction, no insurance or medical credits. Even the employer-paid part of your health insurance is treated as taxable income. On the other hand, the tax is separate from your other income.
When does it pay off?
Monthly income tax plus local tax for a single person with a ₩200,000 meal allowance, 2026:
| Annual salary | Standard table | 19% flat |
|---|---|---|
| ₩30,000,000 | ₩32,070 | ₩542,040 |
| ₩50,000,000 | ₩209,680 | ₩904,540 |
| ₩80,000,000 | ₩671,250 | ₩1,448,290 |
| ₩120,000,000 | ₩1,586,820 | ₩2,173,300 |
| ₩150,000,000 | ₩2,553,430 | ₩2,717,050 |
| ₩200,000,000 | ₩4,205,270 | ₩3,623,300 |
| ₩300,000,000 | ₩7,618,950 | ₩5,435,810 |
Under the standard system, low and middle incomes pay an effective rate far below 19%, so the flat rate is more expensive. The flat rate starts to win only at high salaries, roughly ₩150–200 million a year or more, and the exact point depends on your dependents and deductions. Compare both with your own numbers using the take-home pay calculator.
How to apply
- Monthly: submit the flat-rate withholding application (단일세율적용 원천징수신청서) to your employer by the 10th of the month after the month you started work. Your employer then withholds 19% each month.
- At year-end: you can also choose the flat rate during the January–February year-end tax settlement, or when filing your own tax return in May.
You choose each year, so you can switch back if your income changes.
A change proposed for 2027
The government's 2026 tax reform proposal would raise the flat rate from 19% to 21% (23.1% with local tax) for income from January 2027, and extend the start-of-work deadline to the end of 2029. As of October 2026 this is a proposal before the National Assembly and not yet law. If it passes, the flat rate will be worthwhile for even fewer people.
Bottom line
Unless you earn a very high salary, the standard table with your normal deductions is usually cheaper. Run both through the calculator, then ask your employer's payroll team or the National Tax Service (126) before you file the application.
This guide reflects Korean laws and official notices as of 2026-10-08. Rules change, so confirm with the relevant agency before making important decisions.