Korea tax guide
Korean Payroll Withholding Tax for Foreign Employees
Year-End Settlement
Who this guide is for
- Foreign employees reading a Korean payslip
- New hires comparing gross and take-home salary
- Employees choosing 80%, 100%, or 120% monthly withholding
- Foreign workers comparing ordinary payroll withholding with the 19% flat-tax method
Quick Answer
Monthly Korean payroll withholding is a prepayment, not the employee's final annual tax. An employer normally withholds wage and salary income tax using the simplified withholding table and payroll facts such as taxable salary and eligible family members. An employee may generally choose 80%, 100%, or 120% of the table amount, but that choice mainly changes timing: year-end settlement later compares annual tax with tax already withheld. Foreign employees considering the separate 19% flat-tax method need a different analysis because it generally gives up deductions, exemptions, reductions, and credits.
Key points
- Monthly withholding is an advance collection that is reconciled later.
- Taxable salary can differ from gross cash compensation because some items may be non-taxable or separately classified.
- The 80%, 100%, or 120% election changes cash flow more than final annual liability.
- Local income tax is a separate payslip line and should be included when reconciling total tax paid.
- The foreign-worker flat-tax method is not simply a payroll percentage choice and can remove deductions and credits.
Step-by-step explanation
Read the payslip in separate layers
Start with gross compensation, then identify taxable wage and salary income, non-taxable items, national income-tax withholding, local income tax, pension, health insurance, employment insurance, and other deductions. Only the tax lines belong in the income-tax reconciliation. Social-insurance contributions follow separate systems and should not be described as extra income tax.
Confirm the simplified-table inputs
Korean payroll generally uses the simplified withholding table for ordinary monthly salary. Check the taxable monthly salary, number of family members eligible for the basic deduction, and eligible dependent children. A marriage, birth, departure, change in a dependent’s income, or incomplete payroll form can make the table input stale.
Choose 80%, 100%, or 120% for cash-flow reasons
The NTS foreigner year-end guide explains that an employee may choose 80% or 120% of the simplified-table amount instead of the standard amount. Paying less monthly can increase the balance due later; paying more can increase a refund or reduce the balance due. The election does not by itself change the annual deductions, credits, or tax brackets.
Treat flat-tax withholding as a separate method
Foreign-worker flat-tax withholding is not the same as choosing 120% of the ordinary table. It has its own eligibility and form requirements and applies 19% to the covered wage and salary income under the special method. Because the flat method generally disallows deductions, exemptions, reductions, and credits, compare annual outcomes rather than only the monthly payslip.
Reconcile at year-end and after job changes
At year-end settlement, compare final annual national and local income tax with the amounts withheld each month. If you changed jobs, give the new employer the prior-employer withholding receipt so both salary records can be combined where required. Keep the final annual receipt because it is the key record for refunds, later May filing, visa income proof, and corrections.
Documents you may need
- Monthly payslips
- Employment agreement and compensation breakdown
- Dependent-family information submitted to payroll
- Application for 80% or 120% withholding, if used
- Foreign-worker flat-tax application or withdrawal form, if relevant
- Prior-employer withholding receipt after a job change
- Annual wage and salary income withholding receipt
- Year-end settlement deduction and credit evidence
Common mistakes
- Treating the monthly withheld amount as the final annual tax
- Comparing take-home pay without separating income tax, local income tax, pension, and health insurance
- Using an outdated family-member count in payroll
- Choosing 80% withholding to create a refund without planning for a possible balance due
- Assuming the 19% flat-tax method automatically produces a lower total tax
When should you ask a tax professional?
Ask a qualified tax professional if you have income from several countries, business income, unclear tax residency, treaty questions, missing documents, late filing concerns, or a visa situation that depends on tax records. This site explains general patterns only and cannot review your personal facts.
FAQ
Why is my Korean payroll tax different from a coworker's?
Taxable salary, eligible family members, children, the 80% or 120% election, flat-tax treatment, bonuses, and prior payroll corrections can differ. Compare the underlying inputs rather than only gross salary.
Does choosing 120% mean I owe more tax?
It usually means more tax is prepaid during the year. Year-end settlement still calculates the annual liability under the applicable method and compares it with the total already withheld.
Is local income tax included in the NTS withholding calculator?
The NTS calculator focuses on national income-tax withholding. Payroll commonly shows local income tax separately, so include both lines when reconciling take-home pay and annual records.
Can every foreign employee use 19% flat-tax withholding?
No. Eligibility, service dates, related-company restrictions, application timing, and annual method rules must be checked. The method also generally removes deductions, exemptions, reductions, and credits for the covered salary.
Official Sources to Verify
Tax rules and filing procedures in Korea may change depending on your visa status, income type, tax residency, and the tax year. Before making a tax decision, always verify your situation with official sources or a qualified professional.