Salary, investments, and freelance income are not taxed the same way. Here is the difference.

Most foreigners in Korea ask “what is the tax rate” as if there is one answer. There is not. What you owe depends on whether the income comes from a salary, an investment, or freelance work, and each of these follows its own rules.

If you earn a salary

Salary income is taxed on a progressive scale that runs from 6 percent to 45 percent depending on your total taxable income, with local income tax added separately at 10 percent of whatever national tax you owe. Most employees never calculate this by hand, since employers withhold monthly and reconcile everything during year end settlement in February.

Foreign employees also have an alternative worth knowing about. Eligible foreign workers can elect a flat 19 percent rate on employment income instead of the progressive scale, and this election can run for up to 20 years from your first day of work in Korea, provided that start date falls on or before December 31, 2026. The flat rate gives up most deductions, so it tends to help most at higher income levels rather than lower ones. We walk through how the election works and who qualifies in an earlier post. The core structure there still holds, though one detail has moved on since it was written. That post describes a 5 year election window, which reflects the rule at the time. Under current 2026 rules, the window has been extended to 20 years, so use the figure above for how long the election actually runs.

If you have investment income

Investment income is where most confusion starts, because Korea treats different types differently. Interest and dividends are generally taxed through withholding at the point of payment, often at a flat rate, rather than folded into your regular income. Capital gains from selling Korean listed shares can be exempt in many ordinary cases, though this depends on the size of your holding and how the shares are classified. Gains from real estate work under an entirely separate set of rules, generally taxed more heavily and requiring a separate filing.

If you sold something meaningful this year, whether shares, property, or an overseas asset, that transaction likely needs its own analysis. Do not assume the salary rules or the flat rate election say anything about how that gain is taxed.

If you freelance or run a business

Freelance and business income is not covered by either the salary rules or the flat rate election. It is taxed separately under a progressive scale close to the salary structure, but calculated on net income after allowable expenses rather than gross pay, and reported through your own annual filing each May rather than through employer withholding. If you also hold a salaried job, the two income types are usually calculated and reported on separate tracks rather than combined into one number.

The one number to remember

If nothing else stays with you from this article, remember this. There is no single Korea tax rate. There is a rate for your salary, a separate treatment for your investments, and a separate calculation for anything you freelance or run as a business. Knowing which category your income falls into is the first real step, well before worrying about the percentage itself.

If you are trying to work out which of these applies to your situation, I am happy to walk through it with you.

Written by Ara Jung (CTA)

All information provided is of limited scope and not exhaustive or comprehensive of any subject. It is not intended to be legal advice, and should not be used in place of consultation with appropriate professionals