Corporate Tax Guide for Foreign Companies: Corporate Income Tax and VAT
Foreign-invested corporations in Korea are required to file and pay corporate income tax and VAT under the same rules that apply to domestic Korean companies. The moment a company is incorporated, its worldwide income becomes subject to Korean taxation — and there are multiple obligations to manage simultaneously, from withholding tax to transfer pricing to tax invoice issuance. This guide covers the corporate tax structure, VAT filing and refund procedures, withholding taxes, the annual tax calendar, and the mistakes that foreign corporations most commonly make in practice.
Where a Foreign Corporation's Tax Obligations Begin
Scope of Taxation: Domestic vs. Foreign Corporations
Korean tax law classifies corporations as either domestic corporations or foreign corporations. When a foreign parent establishes a subsidiary (stock company or limited liability company) in Korea, that entity is treated as a domestic corporation under Korean tax law. Domestic corporations must pay Korean corporate income tax on their worldwide income.
By contrast, a foreign corporation that operates only a branch in Korea is taxed solely on its Korea-source income. This distinction is one of the most commonly overlooked points. Even within the same foreign enterprise, the tax scope differs completely between a subsidiary and a branch — and the tax strategy must reflect that difference.
Business Registration — This Comes First
Before starting operations in Korea, a company must complete business registration immediately after incorporation. The business registration certificate can be obtained online through the National Tax Service (NTS) Hometax portal or by visiting the local tax office in person. Delays in business registration can result in the loss of input VAT deduction for the period prior to registration.
If the foreign representative does not have a Korean resident registration number, additional documentation is required — this step frequently causes delays in practice.
Important: Under Article 8 of the Value-Added Tax Act, business registration must be filed within 20 days of the date of incorporation. Missing this deadline may result in denial of input VAT deductions for the intervening period.
Corporate Income Tax Rates and Filing Procedures
Korea's Corporate Income Tax Rates — Current Brackets
Korea applies a progressive tax rate structure based on taxable income brackets. The table below reflects current rates and may change if the tax law is amended.
| Taxable Income Bracket | Tax Rate |
|---|---|
| Up to KRW 200 million | 9% |
| KRW 200 million – KRW 20 billion | 19% |
| KRW 20 billion – KRW 300 billion | 21% |
| Over KRW 300 billion | 24% |
Practical note: A local income tax surcharge of 10% is added on top of the rates above. The effective top marginal rate reaches approximately 26.4%. The actual tax liability will vary depending on SME preferential rates and applicable tax credits, so always verify against the tax law in effect for the relevant fiscal year.
Filing Deadlines and Payment Procedures
Corporate income tax must be filed and paid within three months of the fiscal year-end. For companies with a December fiscal year-end, the deadline is March 31 of the following year. The interim prepayment (mid-year installment) is due within two months after the six-month mark of the fiscal year — that is, by August 31.
Filing is submitted electronically through NTS Hometax. Foreign corporations typically engage a licensed tax accountant (CPA or tax agent) to file on their behalf.
Practical note: Reporting obligations for international transaction disclosure reports have been strengthened in recent years. If your company has transactions with overseas related parties, this separate reporting requirement must be tracked carefully. Failure to file results in penalties and increases the likelihood of being selected for a tax audit.
VAT Filing and Refund Structure
VAT Scope and Zero-Rating
Korea's standard VAT rate is a flat 10%, applied to the supply of goods and services and to imports of goods. Export transactions are subject to the zero rate (0%), meaning no output VAT is generated.
Exempt items (medical, educational, financial services, etc.) fall entirely outside the VAT system. Zero-rating and exemption are distinct concepts — determine which applies to your business model before structuring your tax position. The relevant provisions can be found in Articles 24 and 26 of the Value-Added Tax Act.
VAT Refunds — Where Foreign Corporations Often Get Stuck
When input VAT exceeds output VAT, a refund claim can be filed. Companies with a high proportion of export sales or those in an early investment phase frequently generate refund positions. The complication begins here: upon filing a refund claim, the NTS may conduct tax verification, including on-site inspections.
Auditors will scrutinize whether tax invoices were properly issued and whether the underlying transactions actually occurred. Incorrectly issued or missing tax invoices can delay or result in denial of the refund. In practice, this is where the most time is consumed in the entire VAT compliance cycle.
VAT Filing Schedule
| Tax Period | Filing and Payment Deadline |
|---|---|
| 1st Period – Preliminary (Jan–Mar) | By April 25 |
| 1st Period – Final (Jan–Jun) | By July 25 |
| 2nd Period – Preliminary (Jul–Sep) | By October 25 |
| 2nd Period – Final (Jul–Dec) | By January 25 of the following year |
Important: Corporate taxpayers are generally required to file preliminary VAT returns. Smaller corporations below a certain threshold may instead receive a pre-assessed notice in lieu of filing, but eligibility must be confirmed with the local tax office.
If this is your first time filing taxes for a foreign corporation in Korea, there will almost certainly be points where you cannot proceed without professional guidance. Errors or omissions in corporate income tax or VAT filings translate directly into penalty surcharges — so early verification is essential.
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Withholding Tax — On Dividends, Interest, and Royalties
Key Withholding Tax Rates
Withholding tax applies when paying dividends to a foreign parent company or remitting interest or royalties. The paying entity withholds the tax first and remits the net amount. If the full amount is paid without withholding, the paying entity becomes liable for the tax itself.
| Income Type | Statutory Rate | Effective Rate (incl. Local Income Tax) |
|---|---|---|
| Dividend income | 20% | 22% |
| Interest income | 20% | 22% |
| Royalties | 20% | 22% |
| Personal service income | 20% | 22% |
Reduced Rates Under Tax Treaties
Korea has concluded tax treaties with more than 90 countries, including the United States, China, Japan, and Germany. If the foreign parent is based in a treaty country, the withholding rate on dividends, interest, and royalties may be reduced to 5–15%. The critical point is this: a tax exemption or reduction application must be submitted before payment in order for the treaty rate to apply.
If payment is made without submitting the application, the statutory rate of 20% will be withheld. A refund claim can be filed afterward, but the process is complex and time-consuming. Country-specific treaty rates are available through the NTS International Tax guidance. Note that interpretations of certain treaties have changed recently, so current treaty terms for your specific country should always be verified with a qualified professional.
Annual Tax Calendar at a Glance
The key tax deadlines that a foreign corporation must track throughout the year:
| Deadline | Key Filing / Payment |
|---|---|
| January 25 | 2nd Period Final VAT return (prior year Jul–Dec) |
| February | Year-end income tax settlement for employees (if applicable) |
| March 31 | Corporate income tax return and payment (December fiscal year-end) |
| April 25 | 1st Period Preliminary VAT return (Jan–Mar) |
| July 25 | 1st Period Final VAT return (Jan–Jun) |
| August 31 | Corporate income tax interim prepayment |
| October 25 | 2nd Period Preliminary VAT return (Jul–Sep) |
Practical note: Companies with a foreign representative or foreign shareholders must also separately confirm obligations for international transaction disclosure statements and overseas financial account reporting. These deadlines may differ from the corporate income tax filing deadline, and failure to file carries penalties.
The Most Common Tax Mistakes Made by Foreign Corporations
Transfer Pricing Issues
One of the most frequently problematic areas in practice is transfer pricing. If the prices set between a foreign parent and its Korean subsidiary differ from arm's-length market prices, the NTS has authority to adjust those prices and impose additional tax. Transfer pricing issues often surface all at once during a tax audit, sometimes covering multiple years of transactions.
If your company has related-party transactions — service fees, raw material purchases, royalties, and similar items — documentation supporting the arm's-length pricing must be prepared on an annual basis. Companies above a certain size are also subject to mandatory transfer pricing report submission. Whether your company's related-party transaction volume meets the filing threshold should be confirmed through NTS Transfer Pricing guidance or a qualified tax professional.
Failure to Issue Tax Invoices or Issuing Them Incorrectly
Tax invoices must be issued at the time of supply. Delayed issuance or invoices issued with an incorrect business registration number will cause errors in input and output VAT accounting. A common mistake in practice is issuing paper invoices when electronic tax invoice issuance is mandatory.
All corporate taxpayers are subject to the mandatory electronic tax invoice requirement. Failure to issue electronic tax invoices results in a penalty surcharge of 1% of the supply value. Errors in this area can unravel the entire VAT return.
Frequently Asked Questions
Q. Can foreign corporations claim VAT refunds in Korea?
Yes, they can. When input VAT exceeds output VAT, a refund claim may be filed. However, the NTS may initiate a verification review upon receiving the refund application, and clear supporting documentation — including properly issued tax invoices and evidence of actual transactions — is required for the refund to be processed smoothly.
Q. Can we file our own corporate income tax return?
Legally, self-filing is permitted. In practice, however, foreign corporations typically run into complications involving international transaction supporting documents, transfer pricing considerations, and treaty application — issues that tend to trip up those unfamiliar with the Korean system. It is not uncommon for foreign representatives with limited Korean proficiency to incur penalty surcharges when attempting to file independently.
Q. Does having a tax treaty automatically mean a lower withholding rate applies?
No, it does not. To apply the treaty rate, a tax exemption or reduction application must be submitted before payment is made. If payment is made without submitting the application, the statutory rate will be withheld, and a separate refund procedure will be required afterward.
Q. Is an interim tax prepayment required in the first year of business?
No. In the first fiscal year of operations, there is no prior-year tax liability on which to base the prepayment, so the obligation does not apply. The interim prepayment obligation begins from the second fiscal year onward. The calculation method and threshold amount may change from year to year, so always verify under the tax law applicable to the relevant fiscal year.
Q. How is tax handled when paying dividends to foreign shareholders?
When distributing dividends to foreign shareholders, the statutory withholding rate of 20% is deducted before remittance. If a treaty exemption or reduction application has been completed, the lower treaty rate will apply instead. The declaration date, payment date, and withholding tax filing deadline are all interconnected — the tax schedule should be confirmed with a tax professional before the dividend decision is finalized.
Q. What should we do if we missed the corporate income tax filing deadline?
File a late return as soon as possible. A failure-to-file penalty surcharge (20%) will apply, but voluntarily submitting a late return entitles the company to a partial reduction of that penalty. Filing before the NTS issues an official determination and assessment is the best way to limit the financial consequences.
Need Professional Guidance?
The tax structure for a foreign corporation in Korea involves corporate income tax, VAT, withholding tax, and transfer pricing — all interconnected. An error in one area can ripple through the entire set of filings. Vision Administrative Office provides end-to-end support for foreign-invested companies, from incorporation and tax compliance to visa services — all in one place.
Vision Administrative Office — Services
- Foreign corporation establishment and foreign investment filing
- Corporate income tax and VAT filing support (in coordination with licensed tax accountants)
- Withholding tax filing and tax treaty reduction applications
- Transfer pricing documentation support
- D-8 and E-7 investor and employment visas for foreign nationals
Fees vary by case and will be quoted accurately during the initial consultation at no charge.
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