Salary Calculator (Korea)

How It Works

The salary calculator deducts social insurance (national pension, health insurance, employment insurance, long-term care) and income tax from gross annual salary to calculate net pay. Insurance premiums use legally mandated rates, and income tax follows withholding tax tables. Monthly pay, net take-home, and annual deduction totals are displayed in detail.

How to Use This Calculator

You only need one number to get started — your gross annual salary. The optional fields refine the estimate.

1. Type your pre-tax annual salary in KRW into the Annual Salary (Pre-tax) field. Thousands separators are added automatically as you type.
2. Pick the number of Dependents. This count includes yourself, so a single worker with no dependents should leave it at "1 (Self only)".
3. Select how many Children under 20 you support. Each child triggers a tax credit that lowers the withheld income tax.
4. Adjust the Monthly Non-taxable amount if needed. It defaults to the standard meal allowance, which is paid tax-free; if your employer provides a different non-taxable amount, enter what appears on your pay stub.
5. Check Salary includes severance pay if your contract folds severance into the annual figure — the calculator then sets one-thirteenth aside before computing monthly pay.
6. Check Youth tax reduction for SME if you qualify for the young-employee tax break at a small or medium-sized company.
7. Press Calculate (or hit Enter in the salary field) and the results panel updates instantly.

Making Sense of the Numbers

The blue card at the top shows the headline figures: your estimated Monthly Take-home Pay and the annual equivalent. Below it, the Monthly Deductions Breakdown lists every amount subtracted from your gross monthly salary, with the sum shown as Total Deductions at the bottom.

A quick worked example makes the flow clear. Suppose you enter an annual salary of 48,000,000 KRW. Dividing by twelve gives a gross monthly salary of 4,000,000 KRW. The calculator then subtracts the four social insurance premiums plus income tax and local income tax. If those six line items were to total 600,000 KRW, the monthly take-home pay would read 3,400,000 KRW, and the annual take-home would be twelve times that: 40,800,000 KRW.

One structural detail worth knowing: local income tax is not computed independently — it is always a fixed 10% surcharge on the income tax line. So anything that reduces your income tax (more dependents, child credits, the youth reduction) automatically shrinks local income tax as well.

Frequently Asked Questions

What is the difference between gross and net salary?

Gross salary is the full amount your employer agrees to pay before anything is withheld, while net (take-home) salary is what actually reaches your bank account. The gap between the two consists of mandatory social insurance contributions and withheld taxes. Job offers are almost always quoted in gross terms, which is exactly why a calculator like this is useful when comparing offers.

What do the four social insurance deductions cover?

Korea, like many countries, funds its social safety net through payroll contributions. The national pension builds your retirement income, health insurance covers medical care, long-term care insurance funds elder-care services, and employment insurance pays unemployment and parental-leave benefits. Employers pay a matching share on top of what you see deducted, so the amounts in the breakdown are only the employee portion.

Why is tax withheld every month instead of paid once a year?

Employers are required to withhold an estimated income tax from each paycheck and remit it to the tax office on your behalf — a system known as withholding or pay-as-you-earn. The monthly amount is an estimate based on official withholding tables, not your final liability. A year-end settlement reconciles the difference: if too much was withheld you get a refund, and if too little was withheld you pay the balance.

Why does my actual paycheck differ from the estimate?

Real payrolls vary in how they handle bonuses, overtime, non-taxable allowances, and optional withholding ratios, so two people on identical annual salaries can see different monthly deposits. Company-specific benefits and deductions (union dues, group insurance, cafeteria plans) also never appear in a generic calculator. Treat the result as a close estimate and check your pay stub for the exact figures.

How do dependents change the result?

Tax systems generally recognize that supporting a family costs money, so each qualifying dependent reduces the income on which your tax is calculated. With a lower taxable base, both the income tax and the 10% local surcharge fall, which raises your take-home pay. Only family members who meet income and age requirements count, so choose the number that matches your actual tax filing.

What does "salary includes severance pay" mean?

Some Korean employment contracts quote an annual figure that already contains the statutory severance accrual, effectively spreading thirteen payments across the year. When you tick this option, the calculator removes one-thirteenth of the annual amount before dividing by twelve, which lowers the gross monthly salary and every deduction based on it. If your contract quotes salary and severance separately, leave the box unchecked.

Why a Raise Never Fully Reaches Your Bank Account

Income tax in Korea — as in most countries — is progressive: higher slices of income are taxed at higher rates. A raise sits on top of everything you already earn, so it gets taxed at your highest applicable rate rather than your average one. Imagine, with purely hypothetical brackets, that your current salary tops out in a 12% band and the raise pushes its last portion into a 22% band: of every 100,000 KRW in that portion, 22,000 KRW would be withheld rather than the 12,000 KRW the rest of your income suggests.

Social insurance premiums add to the effect because most of them scale with salary. The practical takeaway: run the calculator twice, once with your current salary and once with the proposed one, and compare the two take-home figures. The difference between them — not the difference in gross salary — is what a raise is really worth in monthly cash, and it is the number worth knowing before you accept an offer or start negotiating.

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