Only Korean-Source Income Is Taxed — But Check Your Withholding Carefully
Nonresidents only owe tax on income earned in Korea (Korean-source income), and in most cases the payer withholds the tax, which settles the filer's tax duty entirely. But if you're a resident of a country with a tax treaty with Korea, you may qualify for a reduced rate below what domestic tax law would otherwise require — and whether you apply for it can make a real difference to your actual tax burden.
Major Types of Korean-Source Income & How They're Taxed
Steps to Apply the Reduced Treaty Rate
Tax Advantages for Nonresidents
A tax treaty can significantly reduce your tax burden
If your home country has a tax treaty with Korea, you may qualify for a reduced rate below what domestic law requires, or certain income may even be tax-free or exempt.
Applying in advance is far simpler than claiming a refund later
If you submit the application before the income is paid, you're withheld at the lower rate from the start — sparing you the hassle of filing a request for reassessment afterward.
Foreign tax credit reduces double taxation
If the same income was also taxed in your home country, the foreign tax credit lets you deduct the tax already paid abroad from your Korean tax bill.
The Most Common Mistake We See
People often don't realize a reduced treaty rate exists and get withheld at the full domestic rate, or they don't realize how long it takes to obtain a certificate of residency and miss the application deadline when the income is actually paid.