Gross vs. Net Salary in Korea: Why the Gap? (2026 Guide)

Your employment contract says KRW 48 million per year. Assuming KRW 200,000 of qualifying monthly non-taxable pay, one eligible family member (yourself), severance outside the salary, and standard employee insurance enrollment, this calculator estimates about KRW 3.44 million a month after deductions. This article explains the three layers that separate gross salary from take-home pay under the calculator's current 2026 assumptions.

1. The Big Picture

Three deductions stand between your contract salary and your bank account:

• Employee deductions related to the four major social insurances — National Pension, Health Insurance plus its long-term-care levy, and Employment Insurance. Industrial Accident Compensation Insurance is one of the four, but its premium is employer-paid.
• Income Tax — 100% standard withholding from the official table effective March 1, 2026
• Local Income Tax — Flat 10% of the income tax figure

The calculator subtracts the entered monthly non-taxable amount once from both taxable monthly pay and its estimated insurance base. Whether a particular allowance is tax-exempt or excluded from social-insurance remuneration depends on its statutory conditions and actual payroll reporting.

2. 2026 Insurance Rates Used by the Calculator

These are standard employee shares for a worker with no enrollment exemption:

• National Pension: the 2026 employee rate is 4.75% of standard monthly income. The KRW 410K–6.59M income band applies Jul 2026–Jun 2027
• Health Insurance: employee share of 3.595% of monthly remuneration
• Long-term Care: health premium × (0.9448 ÷ 7.19), approximately 13.14%. The calculation uses the original ratio, not the rounded 13.14% display
• Employment Insurance: employee share of 0.9%

The income-band period in the NPS contribution guide is separate from the rate's calendar year: the employee pension rate becomes 5.0% in 2027. The care formula follows NHIS's 2026 rate notice.

The nominal percentages add to about 9.72% at ordinary pay levels, but that is not a flat rate on every salary. Pension and Health Insurance have bases and limits, and age, nationality, visa status, or a social security agreement may create enrollment or contribution exceptions. The calculator assumes none of those exceptions. On a KRW 3.8M estimated insurance base, it returns about KRW 369,000in employee premiums.

3. The Income Tax Detail: Dependents Matter

Monthly income tax is withholding, not final liability. The calculator looks up 100% of the standard amount in the earned-income simplified withholding table effective March 1, 2026, using taxable monthly pay and eligible family members including the employee. It also applies the table's adjustment for eligible children aged 8–20. Year-end settlement (연말정산) then reconciles final liability.

At KRW 3.8M taxable monthly and no children aged 8–20, the table amount is KRW 169,260 with one eligible family member (the employee) and KRW 74,560 with four. Local income tax adds 10%. A payroll election of 80% or 120%, or different family information, will produce a different payslip amount.

4. Three Checks for a More Accurate Comparison

1. Confirm which allowances actually qualify as non-taxable. Enter only meal allowance that meets the statutory conditions and is properly treated in payroll. Renaming part of salary does not automatically reduce tax or premiums.
2. Report eligible family members accurately. The count includes you. Give payroll the correct eligible spouse, child, and parent information, including how many counted children are aged 8–20.
3. Check if severance is "included" or "separate". An "included" label does not make division by 13 a statutory formula. The calculator's option is only a comparison convention that treats 12/13 of the quoted total as salary. Whether monthly advance payments labeled as severance are legally effective, or satisfy statutory severance, is a separate question.

6. Run Your Own Numbers

The calculator uses 100% standard withholding from the table effective March 1, 2026 and current standard employee premium rates. It does not model insurance exemptions based on age, nationality, visa status, or social security agreements, or an employer's actual reported remuneration.

• Salary Calculator — with reverse-calc from desired net pay
• 4 Major Insurance Calculator
• Severance Calculator

FAQ

Q. Is the KRW 200K meal allowance really available at every company?

The cap was raised to KRW 200,000 in 2023 and remains in effect in 2026, but it is not an automatic exemption for every employee. Ask payroll whether the allowance meets the statutory conditions and how it appears on your payslip.

Q. Why do people get tax refunds in year-end settlement?

Because monthly withholding is only an estimate. Year-end settlement computes your real liability after credits (credit-card spending, medical expenses, pension savings, etc.) and returns the overpayment, or demands the shortfall.