Income Tax in Korea for Foreign Workers

Korean income tax rarely requires action from a salaried foreign worker, which is exactly why it catches people out. It is withheld automatically, it is reconciled once a year, and the one annual event — year-end settlement — arrives with a deadline and a document list that nobody explains in advance.

Here is the shape of it.

How it works month to month

Your employer withholds income tax from your salary before you are paid, along with the other statutory deductions. Your payslip typically shows:

• Income tax — withheld against an estimate of your annual liability
• Local income tax — a surcharge calculated as a proportion of the income tax
• National Pension — a percentage split with your employer
• National Health Insurance — likewise, see health insurance for foreigners
• Employment insurance

The withheld amount is an estimate. The actual figure is settled in February.

Year-end settlement (연말정산)

This is the one thing to understand.

Each February, your employer recalculates what you actually owed for the previous calendar year, taking account of deductions and credits you are entitled to. That figure is compared against what was withheld across the year:

• Withheld too much → refund, paid with a following month's salary
• Withheld too little → additional deduction

For many salaried workers, the settlement produces a refund, and the size of that refund depends on how much documentation you supply.

What typically reduces the bill:

• Credit and debit card spending above a threshold of income
• Rent paid, for those meeting the criteria
• Insurance premiums
• Medical and education expenses
• Pension contributions
• Donations

The National Tax Service operates a simplified year-end settlement service that gathers much of this automatically from card companies, insurers, and hospitals — a very large share of the work is already done for you before you file anything. The National Tax Service publishes English-language guidance, and its Hometax portal is where the data is pulled from.

The practical instruction is short: use a registered Korean card for ordinary spending rather than cash, because card spending is captured automatically and cash is not.

The flat-rate election

Qualifying foreign workers may elect to be taxed at a single flat rate on gross employment income instead of the progressive scale.

The trade-off is straightforward: the flat rate strips out most deductions and credits. That makes it favourable for higher earners with few deductible expenses, and unfavourable for those with substantial rent, medical costs, dependants, or card spending.

There is no universal answer to which is better — it depends on your income and your deductions. Your employer's payroll team can usually model both, and this is a case where asking is worth the mild awkwardness. The election is made annually.

Residency status, and why it matters

Korea distinguishes between residents and non-residents for tax purposes, and the distinction is not the same as your visa category. It turns on where your life is centred and how long you have been here.

The consequence is real: residents may be taxed on worldwide income, while non-residents are taxed only on Korea-sourced income. There are meaningful exceptions and transitional rules for foreign workers, and Korea has tax treaties with many countries that determine which country gets to tax what.

This is the part of Korean tax where general guidance stops being useful. If you have income outside Korea — rental property, investments, a business — get advice from someone who can look at your specific facts and the relevant treaty. It is not expensive relative to getting it wrong.

What to keep, from day one

• Payslips, every month
• Income tax withholding certificate (원천징수영수증) — issued annually, and needed for far more than tax: visa extensions, loan applications, and sending money out of Korea all ask for it
• Rent contract and payment records, if claiming rent
• Receipts for anything not captured by the card system

The withholding certificate is the single most requested document in a foreign resident's administrative life in Korea. Keep every one.

Leaving Korea

If you leave partway through a year, an early settlement is done before your final salary. Two things to handle at the same time:

• National Pension refund. Citizens of countries with a social security agreement with Korea can usually reclaim their contributions on departure — a genuinely significant sum after a year or more. It is claimed, not automatic.
• Any outstanding health insurance premiums, which follow you into future visa applications if unpaid.

Neither happens by itself, and both are much harder to sort out after you have flown home.

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Verified August 2026. Tax rates, thresholds, deduction rules, and treaty provisions change, and individual circumstances vary enormously. This is general information, not tax advice — consult a qualified tax professional or the NTS for anything binding, and see terms. Corrections via contact.