If you work for a Korean employer, you have probably noticed that income tax is taken out of every paycheck before you ever see it. Those deductions are only estimates. Once a year, Korea reconciles what was withheld against what you actually owed — a process called yeonmaljeongsan (연말정산), the year-end tax settlement. The result is either a refund landing back in your account or, occasionally, a small extra payment.
For foreign workers the settlement has a useful twist: many can choose a special flat-rate option instead of the regular system, and pick whichever leaves them paying less. This guide explains how the settlement works, who it covers, the flat-rate choice, the deductions worth knowing, and how the paperwork actually flows. Tax rules change frequently, so treat this as an orientation and confirm specifics on the National Tax Service (NTS) Hometax site or with a tax office.
What yeonmaljeongsan actually is
Throughout the year your employer withholds an estimated amount of income tax from your salary each month. Those monthly amounts rarely match your true annual tax once deductions and credits are counted. The year-end settlement adds it all up properly:
- If too much was withheld, you get a refund.
- If too little was withheld, you pay the difference.
It is normally handled through your employer early in the year, covering the previous calendar year's income. You provide your documents, payroll processes the calculation, and the adjustment shows up in an early-year paycheck.
Who it applies to
The year-end settlement is for people with earned income — that is, employees on a salary. If that is you, your employer runs the settlement for you. The picture is different for others:
- Self-employed or freelance earners generally do not do yeonmaljeongsan. Instead they file the global income tax return in May for the previous year.
- People with mixed income (salary plus side income) may need to file in May as well, even after a year-end settlement on the salary portion.
The flat-rate option for foreign workers
Here is the part that is unique to foreigners. Many foreign employees can elect a single flat tax rate applied to their gross employment income, with no deductions or credits. You compare that against the regular method and choose whichever produces the lower tax.
Flat rate vs the regular method
- Flat rate: one rate on your gross salary, simple, no deductions. Often better for higher earners with few deductions.
- Regular (progressive) method: tiered rates that rise with income, but you subtract deductions and credits. Often better if you have significant deductions like housing, dependents, or large card spending.
You are allowed to run both and pick the smaller result, so it is worth checking even if one looks obviously better.
Common deductions and credits
If you go the regular route, these are the deductions and credits foreign workers most often use:
| Category | What it covers |
|---|---|
| Pension & insurance | National pension and statutory insurance contributions |
| Housing | Certain rent or housing-related costs, within set conditions |
| Card & cash spending | Credit/debit card and cash-receipt spending above a threshold |
| Medical | Qualifying medical expenses |
| Education | Eligible tuition and education costs |
| Donations | Approved charitable donations |
| Dependents | Support for qualifying family members |
Card spending in particular ties back to your everyday payments — see our notes on the Korean check and credit cards that feed this data automatically.
The Hometax "simplified" service
The NTS runs a simplified year-end settlement data service inside Hometax that pre-fills much of your information — insurance, pension, card spending, medical, and more — drawn from records reported by banks, card companies, and institutions. You download or share the prepared data and hand it to your employer, which saves enormous effort. Always glance over it, though: some items (like certain housing or overseas costs) may not be captured automatically and need to be added manually with your own receipts.
Documents to give your employer
Your payroll team will tell you their exact list and deadline, but commonly you provide:
- The Hometax simplified-service data file.
- Proof for anything not auto-included (housing, donations, some medical/education costs).
- Documents for dependents you are claiming.
- Your bank account details so any refund can be paid.
That refund lands in your Korean account, so make sure it is active — our guide on opening a bank account covers the basics. If you plan to send a refund or savings home, see sending money abroad from Korea.
What foreigners often miss
- Not comparing the flat rate against the regular method — and overpaying as a result.
- Forgetting deductions that are not auto-filled, like rent or donations.
- Overlooking dependents abroad who may still qualify under certain conditions.
- Missing the employer's internal deadline, which is earlier than you expect.
- Leaving the country mid-year without settling, which can complicate your final tax.
Wrapping up
The year-end tax settlement is simply Korea truing up the tax already taken from your salary, usually through your employer early in the year. As a foreign worker your key move is to compare the flat-rate option against the regular deduction-based method and take whichever costs less — while remembering that the flat rate and its eligibility keep changing. Use the Hometax simplified service to pre-fill your data, add anything it missed, hand your documents to payroll on time, and confirm the current rates and rules with the National Tax Service. Done right, the settlement often means money back in your account.