Business Income Tax Calculator

Business Income Tax Calculator helps model Korea-related business income, expenses, tax rate, and credits in English.

Business income tax calculator

Estimate business income, business-income deduction, personal deductions, progressive tax, local tax, and monthly net income.

Business income

₩38,000,000

Taxable income

₩13,900,000

Total tax

₩1,105,500

Monthly net income

₩3,074,542

Tax burden rate

2.9%

Applied bracket

15% 구간

Business income uses revenue minus expenses, the Korean business-income deduction tiers, 2025 progressive brackets, and local income tax at 10 percent of income tax. This English calculator calls the Korean page feature lib directly. The UI is translated, but the numbers come from the same pure calculation path instead of a generic value-times-rate stub.

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Business income tax calculator

This English guide translates the Korean business-income tax page for sole proprietors and small business owners, preserving revenue, necessary expenses, business-income deduction, progressive tax, local income tax, and monthly net income.

Revenue, expenses, and business income

The Korean utility starts with total revenue minus necessary expenses. It then applies the business-income deduction tiers, including high deduction rates for lower business income and smaller incremental deductions as income rises.

Users can compare double-entry bookkeeping and simple bookkeeping assumptions, but the displayed tax is not a flat business-income rate. It goes through taxable income, progressive income tax, and local tax.

Personal and special deductions

The calculator keeps the KRW 1.5 million basic deduction and allows spouse, dependent, elderly, disabled, pension, IRP, insurance, medical, education, donation, and other deductions.

This matters because the same business profit can produce different tax depending on family deductions and deductible payments. A business owner should not estimate tax only from sales or cash receipts.

Planning use

The result shows business income, taxable income, income tax, local income tax, total tax, tax burden rate, net annual income, and monthly net income. These outputs are useful for quarterly cash-flow planning and May comprehensive-income filing.

Before filing, match the calculator inputs to actual bookkeeping records, card statements, tax invoices, payroll data, and deductible contribution certificates. The quality of evidence changes whether an expense can actually be claimed.