How is Korean income tax withheld from a salary?

Employers withhold monthly income tax using the NTS simplified withholding table (간이세액표), based on your taxable pay and number of dependents/children. Local income tax is an extra 10% of that amount.

Is this the exact tax I will pay?

No — it is a monthly withholding estimate. Your final tax is settled through year-end tax settlement (연말정산), which reflects deductions and credits and can result in a refund or additional payment.

How much is the child deduction in the simplified table?

In the 2026-03-01 simplified table, the child deduction (ages 8–20) is 20,830 KRW for one child, 45,830 KRW for two, and 45,830 KRW plus 33,330 KRW for each additional child beyond two. (The year-end child tax credit is a separate, annual figure.)

Does this tool upload my data?

No. Everything runs right in your browser, so your data never leaves your device — it even works offline once the page has loaded.

🧾 Korean Income Tax Calculator (간이세액표)

Enter your monthly gross pay, non-taxable allowance, and number of dependents and children under 20 to estimate your monthly Korean earned-income tax (근로소득세) and local income tax (지방소득세). Based on the 2026 NTS simplified withholding table. Runs entirely in your browser — free and offline.

Inputs

Monthly gross pay (월 세전 급여, KRW)

Non-taxable allowance (비과세 수당, KRW)

Dependents incl. self (부양가족 수)

Children aged 8–20 (8~20세 자녀 수)

Based on the 2026-03-01 NTS simplified withholding table (간이세액표, 별표2). Child deduction (ages 8–20): 20,830 for 1, 45,830 for 2, +33,330 each beyond. Monthly withholding figure.

Income tax (근로소득세)

—

Local income tax (지방소득세)

—

Total monthly tax (합계)

—

Private by design. This tool runs entirely in your browser — nothing you enter is uploaded or stored, and it works offline.

About

Income tax follows the 2026-03-01 NTS simplified withholding table (국세청 간이세액표, 별표2). The taxable base is your monthly gross pay minus the non-taxable allowance; the table sets the tax by pay level and number of dependents. For children aged 8–20 a child deduction is subtracted (20,830 KRW for one, 45,830 KRW for two, plus 33,330 KRW per additional child). Local income tax is 10% of the income tax. This is a monthly withholding figure — your real tax is settled at year-end (연말정산). All calculations run client-side, so your figures never leave your device.

How to use

Enter your monthly gross pay (월 세전 급여) and non-taxable allowance (비과세 수당).
Enter dependents including yourself (부양가족 수) and children under 20 (20세 이하 자녀 수).
Read your monthly income tax, local income tax, and the total (monthly and annual).

FAQ

How is Korean income tax withheld from a salary?: Employers withhold monthly income tax using the NTS simplified withholding table (간이세액표), based on your taxable pay and number of dependents/children. Local income tax is an extra 10% of that amount.
Is this the exact tax I will pay?: No — it is a monthly withholding estimate. Your final tax is settled through year-end tax settlement (연말정산), which reflects deductions and credits and can result in a refund or additional payment.
How much is the child deduction in the simplified table?: In the 2026-03-01 simplified table, the child deduction (ages 8–20) is 20,830 KRW for one child, 45,830 KRW for two, and 45,830 KRW plus 33,330 KRW for each additional child beyond two. (The year-end child tax credit is a separate, annual figure.)
Does this tool upload my data?: No. Everything runs right in your browser, so your data never leaves your device — it even works offline once the page has loaded.