Multi-Job Income Tax Calculator

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

N-job income tax inputs

Additional tax

₩1,421,640

Withheld tax ₩792,000

Health insurance impact

₩0

Annual extra premium estimate.

Total extra burden

₩1,421,640

Side-income effective burden 5.9%

Side-income net

₩22,578,360

Side income after extra tax and premium.

Combines main job and side income under Korean comprehensive income tax and health insurance rules, including 3.3 percent freelancer withholding and dependent-risk logic. 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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N-job income tax and health insurance calculator

This English page translates the Korean side-income guide for workers with multiple income sources, including comprehensive income tax, 3.3 percent freelancer withholding, other income, and health-insurance impact.

Income classification

The main income can be employment income or business income. Side income can be 3.3 percent freelancer business income, registered business income, or other income such as lectures, manuscripts, and temporary personal services.

Freelancer income can use the simple expense-rate scenario of 64.1 percent, the standard expense-rate scenario of 17.0 percent, or a custom expense rate. Other income uses a 60 percent necessary-expense assumption in the Korean model.

Tax and withholding

The calculator computes the main-income-only tax, then recomputes comprehensive income tax after adding side income. It applies personal deductions, pension deduction for employment income, the progressive income tax brackets, and local income tax.

For side income already withheld, the model subtracts withheld tax from the additional income tax. Freelancer income uses 3.3 percent withholding, while other income uses 22 percent on income amount in the modeled logic.

Health insurance impact

For employee-insured workers, non-salary income above KRW 20 million can trigger extra health insurance and long-term care insurance. For dependents, annual income above KRW 20 million or business income above KRW 5 million can cause dependent-status loss.

Regional subscribers can see additional regional premium based on side income. Read the tax and premium burden together because side income can look profitable before insurance but much thinner after insurance.