Comprehensive Income Tax Calculator
Calculate comprehensive income tax and local income tax under the latest tax law (basic rates).
Income & Deductions
Total business/earned/other income after deducting necessary expenses
Total of national pension, housing savings, credit card deductions, etc.
Total of standard tax credit ($70), child, pension account credits, etc.
Total Tax Payable (Income + Local Tax)
₩6,539,500
* Reference calculation using the 8-bracket progressive basic rate (6~45%). Individual exemptions, special provisions, penalties, and prepaid tax (interim/withholding) are not reflected.
Related life info & benefits
The comprehensive income tax calculator combines business, wage, and other taxable income into a total income amount, subtracts income deductions to get the tax base, and applies the 2026 basic rates (6–45%) to compute the tax due plus local income tax.
How the tax brackets work
An 8-step progressive rate applies to the tax base, from 6% (up to 14 million won) to 45% (over 1 billion won), with a progressive deduction subtracted at each bracket to simplify the calculation. Subtracting tax credits gives the final tax due, and adding 10% local income tax gives your total burden.
Who needs to file
Anyone with business, rental, financial, or other income beyond wage income must file and pay comprehensive income tax every May for the previous year's income. Those with wage income only are settled through year-end settlement instead.
Frequently Asked Questions
When is comprehensive income tax filed?
Every year from May 1 to May 31, for the previous year's income.
What is a progressive deduction?
An amount subtracted at each bracket so lower rates aren't double-applied — the calculator applies this automatically.
What is the diligent filing confirmation system?
A system where self-employed individuals above a certain revenue threshold must have a tax agent verify the accuracy of their books before filing, which extends the filing deadline to the end of June.
What if I have both business and wage income?
The two are combined into total income, deductions are applied, and the progressive rate is applied to arrive at a single tax figure.
Is any income separately taxed instead of combined?
Daily wage income, certain financial income, and lottery winnings, among others, are taxed separately at their own rates rather than being combined into comprehensive income.
How do income deductions differ from tax credits?
An income deduction reduces the tax base itself before the rate is applied, while a tax credit subtracts a set amount directly from the calculated tax.
What's the penalty for filing late?
A failure-to-file penalty (up to 20%) and a late-payment penalty can be added, making the burden greater than filing on time.
* Based on the 2026 basic rate table. This is a reference calculation that doesn't reflect exemptions, special provisions, or penalties.
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