Tax tools

Tax outcomes depend on the income type, tax year, eligibility, deductions, and filing facts. These tools help explain a structure and compare input scenarios; they do not determine a filed or assessed amount.

Browser-based tools
Data handling is disclosed on each tool
No signup; device limits apply

Acquisition Tax at Your Entered Rates Use this worksheet to isolate tax in a property budget. It multiplies the entered purchase value by your… Business Number Checksum and Formatting Test whether the final digit matches the checksum derived from earlier digits. No National Tax Service… Engine-Size and Vehicle-Age Base Car Tax Inspect an engine-displacement base tax for non-commercial combustion passenger cars. This excludes local… Korean Dividend and Health-Premium Scenario Compare dividend cash after a Korean withholding assumption and a simplified health-premium model. The form… Duty Free Allowance Compare remaining or exceeded allowances for general goods and alcohol when entering South Korea. The scope… Payroll Insurance Rate Scenario Multiply taxable monthly pay by entered rates to compare employee and employer contributions. Despite the… Freelancer Withholding and Gross-Up Apply two withholding rates to a freelance payment or recover gross from a desired net amount. The familiar… Lotto Tax Estimate withholding and the remaining amount for a represented Korean lump-sum lottery prize. The limited… 2026 Korean Standard Median-Income Ratios Translate a policy percentage into a KRW amount using the 2026 standard median-income table. This… Monthly Take-Home Pay with Entered Income Tax Estimate monthly cash pay by separating payroll components. Income tax is supplied by the user rather than… Annual Salary to Monthly Net Scenario Model an annual salary paid in twelve equal instalments. Contracts differ in whether bonuses or severance… Take-Home Pay Table at an Assumed Rate Compare several pay levels in one scenario table. A single entered income-tax rate is applied across bands,… Other Income Tax Illustrate withholding for an eligible Korean other-income case with a sixty-percent necessary-expense… Prorated Salary by Calendar or Thirty-Day Basis Compare gross pay for a partial employment period. This counts calendar days including both endpoints,… Work Hours for a Take-Home Target Find gross pay and work time needed under one assumed deduction rate. This is reverse arithmetic, not a… Korean 10% VAT: Add or Extract Add or separate VAT for a KRW transaction assumed to use the standard 10% rate. The form does not determine… Korean Card-Spending Income Deduction Inspect the general Korean year-end card-spending deduction structure. A deduction reduces taxable income;…

Start with the tax year and income type

Employment, business, other, interest, and capital income can use different expenses, bases, and rate schedules even at the same gross amount. Confirm the tool’s stated income category and attribution year before entering values.

Thresholds and rates can be amended. Use the page review date and official citation, and consult the rules for the historical year when preparing an earlier return.

What a simplified result may omit

Family circumstances, housing, special regimes, credit limits, local taxes, and social insurance are included differently by each tool. Read the exclusions near the result instead of treating an incomplete scenario as final liability.

Net-pay estimates can require the NTS simplified withholding table, insurance bases, non-taxable pay, and employer payroll rules. A flat-rate shortcut is suitable only as a labeled planning range.

Verification before filing

Recheck principal, tax base, holding period, and deduction choices, then reconcile the estimate with National Tax Service materials or a qualified adviser.

Keep original records and filing evidence. A calculator screen is not a tax return, payment notice, or receipt.

Sources

Frequently asked questions

Can I file the displayed amount as-is?

No. It is an estimate and must be checked through the official process using your full facts and the rules for the applicable year.

Which date do the rules come from?

See each page’s review date and sources. A later statute or notice can change the applicable result.

Last reviewed 9월 4, 2026