Do Foreign Business Owners Have to Pay Income Tax in Advance in November?
Do Foreign Business Owners Have to Pay Income Tax in Advance in November?
“I run a business in Korea. Why am I being asked to pay income tax in November?”
If you are a foreign individual business owner in Korea, you may need to check whether Korean Income Tax Interim Prepayment applies to you.
This is separate from the regular Comprehensive Income Tax filing that generally takes place in May.
What Is Income Tax Interim Prepayment?
Korea operates an interim prepayment system for certain individual taxpayers with comprehensive income.
The National Tax Service explains that this system relates to income earned during the first half of the year, from January through June, with payment generally made in November.
For 2026, the official deadline for income tax interim prepayment is:
November 30, 2026
Does It Apply to Foreign Business Owners?
It can.
Foreign nationality by itself does not determine whether interim prepayment applies.
A foreign individual who is treated as a Korean tax resident and earns income subject to Korea’s comprehensive income tax rules may need to review whether they are covered by the interim prepayment system.
However, not every business owner is required to pay it. Korean tax law provides exclusions depending on factors such as the type of income, business history, and the amount involved.
How Is the Amount Determined?
For many taxpayers, the National Tax Service calculates the interim amount using previous tax information and issues a payment notice.
However, the amount shown on the notice may not always reflect how your business is performing this year.
If your income or business performance has declined significantly, Korean tax rules may allow an alternative calculation based on current-year results in certain circumstances.
Whether this option is available requires a closer review of your actual figures.
Why Should You Check Before November?
Ignoring an interim tax notice or assuming that it does not apply because you are a foreigner can create unnecessary tax issues.
At the same time, paying the amount on the notice without reviewing your current business situation may not always be the only option available.
Running a Business in Korea?
If you are a foreign individual business owner, it is a good idea to review your Korean tax position before the November deadline.
Whether you are subject to interim prepayment, whether the amount on your notice is correct, and whether another calculation method may be available depend on your individual business and tax situation.
Consulting a qualified tax professional can help you confirm your obligation and determine the appropriate way to handle your November income tax payment.
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