Tax rates in South Korea

Company Tax

• 10% (up to KRW 200 million) 
• 20% + KRW 20 million (from KRW 200 million to KRW 20 billion)
• 22% + KRW 3,980 million (between KRW 20 billion and KRW 300 billion)
• 25% + KRW 65,580 million (over KRW 300 billion)

Tax Rate For Foreign Companies

Resident corporations are taxed on their worldwide income. Non-resident corporations with a permanent establishment in Korea are taxed only on their Korean-source income. Non-resident corporations without a permanent establishment in Korea are generally taxed through a withholding tax on each separate item of Korean-source income.

A resident company subject to tax in Korea and overseas is entitled to a foreign tax credit for foreign tax paid in respect of income earned overseas (limited to the amount of tax payable in Korea). The excess foreign tax credit can be carried forward for up to 10 years from the fiscal year starting 1 January 2021.

Capital Gains Taxation

For resident companies, capital gains are treated as ordinary business income and taxed at the normal corporate tax rate. However, capital gains from the sale of non-business purpose real estate are subject to additional capital gains tax, at the rate of 10% (40% in the case of non-registered land or houses).
For non-resident companies, Korean-source capital gains are taxed at either 11% of sales or 22% of gains (whichever is less). In general, no special taxes are levied on gains from mergers.

Main Allowable Deductions and Tax Credits

As a general rule, expenses incurred in the ordinary course of business are deductible, with those above KRW 30,000 needing to be supported by qualifying evidence.

A doubtful accounts reserve is allowed as a deduction for tax purposes at the greater of 1% on the tax book value of the receivables at a year-end or actual bad debt ratio (does not apply to financial institutions). Entertainment expenses of more than KRW 30,000 on an event basis supported by corporate credit card vouchers, cash receipts, or tax invoices can be deductible (up to certain limits). With some exceptions, interest paid in the ordinary course of business is deductible as long as the related loan is used for business purposes. Insurance premiums paid to an insurance company are deductible.

Start-up expenses, such as incorporation expenses, founders’ salary, and registration fees and taxes, are deductible if the expenses are recorded per the articles of incorporation and are actually paid. Goodwill can be amortised over a period of five years using the straight-line method.

Certain charitable contributions can be considered either "Bub-jung" (deductible at up to 50% of the total taxable income for the concerned fiscal year after deduction of net operating loss) or "Ji-jung" (which can be deducted up to 10% of the total taxable income for the fiscal year after the deduction of deductible Bub-jung donations and net operating loss). The amount in excess of such limits can be carried over for ten years.

Net operating losses can be carried forward 10 years up to 60% of a fiscal year's taxable income, or for 15 years when incurred in fiscal years starting on or after January 1, 2020. The carryback of losses is not permitted for big companies; however, SMEs can carry back their losses to the previous accounting year (up to the preceding two years for the net operating losses of tax year including 31 December 2021).

For tax years ending before 31 December 2020, a special deduction from 5% to 30% (depending on corporate location, size, business types, etc., capped at KRW 100 million) applies to SMEs operating in a qualified business (applicable to taxable income arising in the tax years that end before 31 December 2022). Furthermore, several tax credits are available for qualified investments.

Other Corporate Taxes

A capital registration tax of 0.48% (or 1.44% for Seoul Metropolitan Area) is levied. A property tax ranging from 0.1% to 4% is levied on land and buildings for residential and commercial use, vessels, and aircrafts. A comprehensive real estate holding tax, as a national tax, ranging from 0.5% to 6% is charged on a certain excessive aggregated statutory value of land and houses.

Nominal stamp duty is levied on agreements relating to the creation, transfer and alteration of rights. A securities transaction tax is imposed on the transferor of shares at 0.35% (0.43% from 1 January 2021 through 31 December 2022) of the share transfer price. The rate is reduced to 0.1% (0.23% from 1 January 2021 through 31 December 2022), depending on the stock market, where listed shares are transferred.

Companies acquiring real estate, motor vehicles, heavy equipment, and certain other items must pay acquisition tax, generally at 4.6% (including the local surtax).

Stamp duties ranging from KRW 50 to KRW 350,000 apply to agreements relating to the creation, transfer, or alteration of rights.

The four types of social security contributions in Korea are national pension (4.5% of salaries), national health insurance (3.925%), and employment insurance. In addition to a 0.80% (0.90% starting from July 2022) contributions to employment insurance, employers are required to make 0.25% to 0.85% contribution to employment stabilisation insurance and occupational competency development insurance. Furthermore, contributions to the Worker’s Accident Compensation Insurance rates vary from 0.7% to 18.6% of total wages and payroll, depending on the type of industry.

Other Domestic Resources

Doing Business: South Korea, to obtain a summary of taxes and mandatory contributions

Tax Rate

Allowable Deductions and Tax Credits

The Korean law provides for employment income deductions ranging from KRW 0 to 14,750 + 2% on the excess of KRW 100,000, according to the level of income. Standard personal deductions are also available: KRW 1.5 million per year per taxpayer plus KRW 1.5 million per year per spouse or dependant child when each of them has an adjusted gross yearly income of less than KRW 1 million. Additional deductions are available for handicapped persons (KRW 2 million), persons aged 70 or older (KRW 1 million), and single parents (KRW 1 million).

Tax credits are available for medical expenses (15% with a limit of KRW 7 million, exclusively when they exceed 3% of total employment income), insurance premiums (12%, capped at KRW 120,000), donations (15% for the donation amount up to KRW 10 million and 30% for the excess) and education expenses (up to 15% with no cap for the taxpayer, limited to KRW 9 million for each dependant attending university or college, and KRW 3 million for each dependant attending preschool to high school). A tax credit of KRW 150,000 per child aged 7 or older for up to two children and KRW 300,000 per child for the third and more is also available.
All business-related expenses are tax-deductible.

Business losses are deductible against employment income, pension income, other income, interest income, and dividend income; whereas rental losses can only be deducted against rental income. Capital losses are deductible only against capital gains.

Special Expatriate Tax Regime

Non-residents are taxed only on their Korea-sourced income. However, a non-resident is not entitled to claim any personal exemptions for their dependents (except for themselves), income deductions, and tax credits. Foreign residents who have stayed in the country for up to five years during the last ten-year period are taxed on Korea-source income. Nevertheless, foreign residents who have stayed in Korea for longer than five years during the last ten-year period are taxed on their worldwide income.

Foreign employees or executive officers who will begin working in Korea before 31 December 2021 may elect to apply for the flat tax rate of 20.9% (including the local income tax surcharge of 1.9%). In order to do so, they must file an application with the local tax authority.