Financial Income Tax Calculator

Financial Income Tax Calculator helps estimate Korea-related investment or financial income tax from gains, cost basis, and rates.

Financial income tax inputs

Financial income

₩30,000,000

₩10,000,000 exceeds the KRW 20 million threshold.

Final additional tax

₩4,141,720

National additional tax plus local tax, after prepaid withholding.

Comparative final tax

₩10,735,200

Method: comprehensive.

Health premium impact

₩802,163

Annual additional premium estimate.

Models Korean financial-income comprehensive taxation with the same KRW 20 million threshold, interest and dividend withholding, gross-up, progressive tax, credits, prepaid tax, local tax, and health-insurance impact as the Korean calculator. 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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Financial income tax calculator

This page translates the Korean financial-income comprehensive tax guide and keeps the same interest, dividend, withholding, gross-up, progressive tax, health-insurance, and local tax calculation logic.

KRW 20 million threshold

Korean residents generally remain under separate withholding taxation when annual taxable interest and dividend income is KRW 20 million or less. Once taxable financial income exceeds KRW 20 million, the excess can be combined with employment, business, pension, and other income.

The calculator separates taxable financial income from tax-free interest and dividends. General interest uses 14 percent national withholding, non-business money-lending interest uses 25 percent national withholding, and local income tax is reflected separately.

Dividend gross-up and credits

Listed corporation dividends can receive the 11 percent gross-up treatment in the Korean model. The gross-up amount increases income but can also generate a dividend tax credit, so the result is not the same as a simple dividend-times-rate calculation.

After deductions and credits, the model compares separate taxation and comprehensive taxation, subtracts prepaid withholding, and calculates additional national and local tax or a refund. The effective tax rate is measured against taxable financial income.

Health insurance effect

Financial income can also affect Korean health insurance. The calculator keeps the health-insurance subscriber type because employee, regional, and dependent cases react differently to the same financial income.

Use the result before concentrating dividends, maturing deposits in one year, or moving investments between spouses. Tax, health insurance, gift-tax, and holding-period rules should be read together.