Comprehensive Income Tax Optimization Calculator

Comprehensive Income Tax Optimization Calculator helps estimate Korea-related income tax from income, deductions, rates, and credits in English.

Comprehensive income tax optimization inputs

Total tax

₩20,976,175

Includes local tax ₩1,626,925.

Taxable income

₩94,455,000

Total deduction ₩16,295,000.

Tax credits

₩1,350,000

Separate tax ₩3,080,000.

Possible saving

₩4,560,000

Marginal rate 35.0%.

Calculates Korean comprehensive income tax with business, employment, financial, pension, other, and rental income, deductions, tax credits, separate taxation, progressive brackets, local tax, and optimization items. This English calculator calls the same pure tax calculation function used by the Korean page. Inputs and labels are translated; the formula is not replaced by a generic value-times-rate stub.

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Comprehensive income tax optimization calculator

This page translates the Korean comprehensive income tax optimization guide with business, employment, financial, pension, other, and rental income, deductions, credits, separate taxation, and local tax.

Income classification

The Korean model keeps separate inputs for business revenue and expense, employment income and non-taxable income, interest and dividends, pension income, other income, and rental income. Each class uses a different deduction or separate-tax rule.

Financial income is compared against the KRW 20 million financial-income threshold. Other income keeps the KRW 3 million other-income separate taxation threshold, and other income withholding is modeled at 22 percent when separate taxation is selected.

Deductions and credits

The calculator applies earned-income deduction up to the KRW 20 million cap, pension income deduction up to the KRW 9 million cap, personal deductions, national pension, insurance, housing loan interest, Yellow Umbrella deduction, and credit-card deduction categories.

Tax credits include child and newborn credits, pension savings and IRP credits at 13.2 percent or 16.5 percent, insurance, medical, education, donation, monthly rent at 15 percent or 17 percent, marriage credit of KRW 500,000, and standard tax credit.

Optimization result

The result shows taxable income, calculated tax, tax credits, determined tax, local income tax at 10 percent, separate tax, effective rate, marginal rate, and the remaining income before the next bracket.

Optimization items identify where additional deductible or creditable payments may still be useful. Use the result before year-end pension deposits, credit-card spending review, monthly-rent evidence checks, or deciding whether other income should be separated.