Last verified: September 22, 2026 · Korean payroll withholding, year-end settlement and foreign-worker tax rules checked against current National Tax Service guidance and Korean tax law.
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Your Korean employment contract may say ₩50 million a year. Your bank account will never receive ₩50 million divided neatly by twelve.
Part of the difference is tax. Part may be National Pension, health insurance or employment insurance. There may also be allowances, bonuses or other deductions on the payslip.
For a foreign employee receiving a Korean salary for the first time, separating those lines is more useful than trying to memorize the entire Korean income-tax system.
A Korean employee tax year usually has a simple flow:
monthly paycheck and withholding → year-end tax settlement → May filing only when your situation requires it.
This page owns the first step: what happens to tax before the salary reaches your bank account.
Your employer normally withholds income tax from each paycheck and pays it to the tax authority. That monthly amount is a prepayment toward your annual income tax. It is not necessarily your final tax bill.
For many employees, the final wage-income calculation is reconciled through Korea's year-end tax settlement.
1. Start with four numbers, not one
A salary conversation often begins with annual pay. A tax problem usually begins because four different numbers are being treated as if they were the same thing.
| Number | What it tells you | Where to find it |
|---|---|---|
| Annual salary | The compensation figure in your offer or contract. It may include components that need to be separated. | Offer letter / employment contract |
| Gross monthly pay | What the company calculated before payroll deductions for that pay period. | Payslip |
| Tax and deductions | Income tax, local income tax, eligible social-insurance contributions and any other deductions. | Payslip |
| Net deposit | The money that actually reached your account. | Bank transaction |
If those four numbers are kept separate, most first-paycheck questions become much easier.
If they are mixed together, a social-insurance contribution can look like tax, a missing allowance can look like excessive withholding, and a payroll error can look like an income-tax problem.
2. Monthly withholding is not the final annual tax calculation
In Korea, the employer paying wage and salary income acts as a withholding agent. Income tax is taken from payroll and paid on the employee's behalf.
For the ordinary progressive-tax method, monthly withholding generally uses Korea's simplified withholding income-tax table. The National Tax Service also provides an English withholding-tax calculator using salary and qualifying family information.
The final annual calculation is different. It looks at the full year's employment income and the deductions or credits that actually apply.
If ₩220,000 of national income tax is withheld in March, that does not mean March created a final ₩220,000 tax liability that can never change.
At year-end, Korea compares the annual tax liability with the tax already withheld during the year.
If too much was prepaid, the settlement can produce a refund. If too little was prepaid, additional tax can be collected.
3. Income tax and social insurance are different lines
This is one of the easiest mistakes to make when reading a Korean payslip in English.
A lower bank deposit does not tell you how much tax you paid.
| Payslip line | What it is | Tax? |
|---|---|---|
| Income Tax / 소득세 | National income tax withheld from wage income | Yes |
| Local Income Tax / 지방소득세 | Separate local income tax linked to the income-tax calculation | Yes |
| National Pension / 국민연금 | Social-insurance contribution where coverage applies | No |
| Health Insurance / 건강보험 | National Health Insurance contribution where coverage applies | No |
| Long-Term Care / 장기요양보험 | Contribution linked to health-insurance coverage | No |
| Employment Insurance / 고용보험 | Employment-insurance contribution where applicable | No |
The practical difference matters. Questions about National Pension or health-insurance enrollment belong with the relevant insurance agency. A problem with income-tax withholding belongs with payroll and, when necessary, the National Tax Service.
4. A simple paycheck example
Suppose a foreign employee's payslip looks like this:
Gross monthly pay: ₩4,200,000
National income tax withheld: ₩190,000
Local income tax: ₩19,000
Social-insurance deductions: ₩365,000
Other authorized deduction: ₩40,000
Expected net pay: ₩3,586,000
The example does not say that someone earning ₩4.2 million should actually pay those exact amounts. The figures are only there to show the reading order.
You first check whether the gross pay is correct. Then check each deduction. Finally compare the expected net amount with the actual bank deposit.
If the bank received ₩3,586,000, the arithmetic reconciles.
If only ₩3,486,000 arrived, there is an unexplained ₩100,000 difference. That is the question to take to payroll.
5. Why two employees on the same salary can have different withholding
Two employees with the same headline salary can see different payroll tax.
The withholding calculation can reflect qualifying family information. Pay can also differ because one month contains a bonus, taxable allowance or another payroll item.
A foreign employee may have an additional choice: if the statutory conditions are satisfied, the employee can elect the foreign-worker flat-tax method instead of the ordinary progressive-rate method.
That is not a special discount automatically applied to every foreign passport holder.
One may be on the ordinary progressive method while the other has elected the foreign-worker flat-tax regime.
6. Gross salary can still hide important payroll details
Suppose the offer says:
Annual salary: ₩60 million.
You still need to know how the company builds that amount.
Is it twelve equal salary payments? Is a fixed allowance included? Is part of the number a performance bonus that is not guaranteed? Is there a non-taxable item under the ordinary method? Was a signing bonus paid this month?
Those details can move the monthly tax line even when the annual offer has not changed.
This is why the employment contract and payslip should be read together.
7. Your first-paycheck audit takes five minutes
Keep that first payslip. It becomes a useful baseline.
If the second and third months look similar, payroll is easier to understand. If one month suddenly changes, you can see exactly which line moved.
8. A refund does not mean the employer made a mistake
Some foreign employees are surprised when year-end settlement produces a refund after income tax was correctly withheld all year.
That can be completely normal.
Monthly withholding is designed to collect tax during the year. Year-end settlement uses the annual information available at the end of the year.
The same is true in the opposite direction. Additional tax due at year-end does not automatically mean payroll was wrong.
The next question is whether the annual calculation included the correct income, tax method and eligible deduction information.
9. Changed jobs during the year? Keep the old withholding receipt
A job change adds one piece of paperwork that is easy to lose: the withholding receipt from the previous employer.
If your new employer is completing the year's wage-income settlement, the previous employment income may need to be brought into the calculation.
Do not assume two employers automatically become one tax record simply because both paid you in Korea.
Ask the new payroll or HR team what they need from the previous employer.
10. When the problem is probably not income tax
If your base wage is missing, overtime is not on the payslip, or an unexplained housing deduction appeared, start with payroll and employment records.
Those are wage-calculation issues before they are tax questions.
If the wage calculation is correct but you do not understand the income-tax withholding, ask payroll which withholding method was used and compare it with the NTS calculator or guidance.
For foreign-taxpayer questions, the National Tax Service operates English-language resources and foreign-taxpayer assistance.
11. What happens after monthly withholding
For a typical employee with wage income, the next major tax event is the Year-End Tax Settlement — 연말정산.
That is where the annual wage-income tax calculation is reconciled with the tax already withheld.
If you are eligible for the foreign-worker flat-tax regime, the choice between the flat method and ordinary progressive taxation can materially change that annual calculation.
If you also have freelance, business or other income, a separate May filing question may arise.
Monthly withholding — tax prepaid through payroll.
Year-end settlement — annual wage-income reconciliation.
May Global Income Tax return — relevant when your income situation requires a separate annual return.
Related Video: The Basics of Korean Year-End Tax for Foreign Workers
This official National Tax Service video was produced specifically for foreign workers. It gives useful context for how monthly withholding leads into the annual settlement.
Sources
- National Tax Service — English
- NTS — My Withholding Income Tax Calculator
- NTS — 2025 Year-End Tax Settlement Manual for Foreigners
- Korea Law Information Center — Foreign Worker Tax Special Treatment
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