The Tax Treaty That Can Wipe Out Your Korean Income Tax for Two Years

Every payslip in Korea has a line for income tax and a smaller line under it for local tax, which is just 10% of whatever the income tax line says. Most teachers assume that's just the cost of working here. For some nationalities, it doesn't have to be — at least not for the first couple of years.

Korea has a tax treaty with the United States (and a handful of other countries) that contains what's usually called a "teachers and researchers" article. If you qualify, your teaching income can be exempt from Korean income tax for a set period, commonly two years. That's real money. On a mid-range hagwon salary, income tax and local tax together might only run somewhere in the low hundreds of thousands of won a month — not huge, but not nothing over a full year, and it compounds if you renew.

Here's the part forums get wrong constantly: the treaty article was written with universities and government-recognized institutions in mind. A teacher invited to lecture at a Korean university has a clean case. A teacher hired by a private hagwon in Bucheon has a much greyer one. NTS (the National Tax Service) has tightened up how it reviews these claims over the past few years, and some hagwons that used to file the exemption without blinking now tell teachers to sort it out themselves, or don't mention it at all.

What to actually check, in order:

1. Confirm your home country has a relevant treaty article — don't assume it exists just because a friend from a different country got the exemption.
2. Ask your hagwon's accountant (most use an outside 세무사, a licensed tax agent) whether they've filed this exemption for a foreign teacher before.
3. Get the exemption request submitted at or near the start of your contract, not six months in. Filing late doesn't always block you, but it makes the paperwork worse.
4. Keep a copy of whatever form gets submitted to NTS. If your school forgets, you're the one who'll need proof later.
5. Don't confuse this with the flat 19% foreign-worker tax rate — that's a different mechanism, aimed at higher earners, and usually not worth it on a standard hagwon salary.

If nobody files anything, you're taxed the normal way: monthly withholding based on Korea's progressive income tax bands, reconciled every February in what's called 연말정산 (year-end settlement). That reconciliation can hand you a small refund or a small bill depending on how accurately your withholding matched reality.

If you find out too late that you were eligible and nobody filed, you can sometimes claim a refund retroactively through the tax office, but expect it to take a few months and expect to need your own tax accountant, not the school's — because the school's accountant has no incentive to reopen old filings.

We don't know your specific treaty article without knowing your nationality and institution type — this is genuinely one to confirm with NTS or a Korean tax accountant rather than take on a stranger's word, including ours.