Corporate Tax Calculator
Calculate corporate tax and corporate local income tax based on each business year's income (tax base).
Tax Base Input
Taxable income reflecting gross income minus deductible expenses and carried-over losses
Corporate Tax Rates (General Corporations)
- Up to 200M · 9%
- 200M ~ 20B · 19%
- 20B ~ 300B · 21%
- Over 300B · 24%
Total Tax Burden (Corporate + Local Tax)
₩40,700,000
* Reference calculation for general corporations. Alternative minimum tax, tax credits/exemptions, corporate tax on land transfer gains, and SME special provisions are not reflected.
Related life info & benefits
The corporate tax calculator applies a 9–24% progressive rate to a corporation's taxable income for the fiscal year to compute corporate tax and the 10% local corporate income tax.
Rate brackets
A 4-step progressive rate applies: 9% up to 200 million won, 19% for 200 million–20 billion won, 21% for 20–300 billion won, and 24% above 300 billion won, with a progressive deduction applied at each bracket to compute the calculated tax.
How this differs from a sole proprietorship
A corporation's business income is taxed as corporate tax, while the salary the representative draws is separately taxed as wage income tax. For a sole proprietorship, by contrast, all business income is taxed as the owner's personal comprehensive income tax.
Frequently Asked Questions
What is a corporation subject to diligent filing confirmation?
Corporations above a certain revenue size or in higher-risk industries must have a tax agent verify their filing, which extends the deadline by one month.
Is there an interim prepayment for corporate tax?
Yes — corporations with a fiscal year longer than 6 months must prepay an interim tax amount based on first-half results.
How many years can a loss be carried forward?
A fiscal year's loss can be carried forward up to 15 years and offset against future income.
Does converting from a sole proprietorship to a corporation reduce taxes?
For larger income, the top corporate tax rate (24%) is lower than the top comprehensive income tax rate (45%), which can be favorable — but wage income tax on the representative's salary must also be considered.
When is the corporate tax filing deadline?
Within 3 months of the last day of the month the fiscal year ends (by the end of March of the following year for a December year-end corporation).
* Based on 2026 figures. This reference calculation doesn't reflect exemptions, credits, or the minimum tax.
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