Key Takeaways
- The Taiwan–Korea income tax agreement has applied since January 1, 2024.
- Qualifying dividends, interest, and royalties are generally subject to a maximum source-country tax rate of 10%.
- Business profits are generally taxable only in the enterprise’s residence territory unless it operates through a permanent establishment in the other territory.
- Employees must satisfy all applicable conditions—not only the 183-day test—to qualify for short-term employment income relief.
- Treaty relief is not automatic. Tax residence, beneficial ownership, permanent-establishment exposure, supporting documents, and the applicable claim procedure must be reviewed.
Introduction
The Agreement between the Taipei Mission in Korea and the Korean Mission in Taipei for the Avoidance of Double Taxation and the Prevention of Fiscal Evasion with Respect to Taxes on Income was signed on November 17, 2021. It entered into force on December 27, 2023 and has applied since January 1, 2024.
The 29-article agreement is Taiwan’s 35th comprehensive income tax agreement and its second such agreement with a Northeast Asian jurisdiction after Japan. It allocates taxing rights between Taiwan and South Korea, provides relief from double taxation, reduces certain withholding taxes, and establishes mechanisms for cooperation and dispute resolution.
What Is the Income Tax Agreement Between Taiwan and South Korea?
The Taiwan–Korea income tax agreement is a bilateral framework that determines how qualifying income earned across Taiwan and South Korea may be taxed. It can limit source-country taxation, prevent the same income from being taxed twice, and provide procedures for resolving treaty-related disputes, subject to residence, beneficial-ownership, permanent-establishment, and other eligibility requirements.
Under the agreement, qualifying residents may benefit from:
- A maximum 10% source-country tax rate on dividends
- A maximum 10% source-country tax rate on interest, with exemptions available for certain interest
- A maximum 10% source-country tax rate on royalties
- Source-country exemption for business profits where the enterprise does not have a permanent establishment there
- Relief for certain employment and independent personal-services income
- A mutual agreement procedure for taxation inconsistent with the agreement
The reduced rates are ceilings rather than guaranteed rates. A taxpayer must satisfy the relevant agreement article and domestic procedural requirements before claiming relief.
The Taiwan Ministry of Finance reported that the agreement became Taiwan’s 35th comprehensive income tax agreement. Taiwan’s International Trade Administration subsequently reported total Taiwan–Korea bilateral trade of approximately US$64.499 billion in 2024, up 38.35% from 2023. This illustrates the commercial importance of clear cross-border tax rules.
STATISTIC-SOURCE: https://www.trade.gov.tw/Files/PageFile/725561/725561ushgd20251020085107.pdf
Key Considerations Before Applying the Taiwan–Korea Income Tax Agreement
Taxpayers should address the following matters before claiming treaty relief.
- Confirm the relevant income period. The agreement applies to withholding taxes on income paid or credited from January 1, 2024 and to other covered taxes for tax years beginning on or after that date.
- Establish treaty residence. The claimant must qualify as a resident of Taiwan or South Korea under the agreement. A certificate of residence will generally be an important supporting document.
- Identify the correct income article. Business profits, dividends, interest, royalties, employment income, capital gains, pensions, and other income are governed by different provisions and conditions.
- Review beneficial ownership. A recipient claiming the reduced rate for dividends, interest, or royalties must generally be the beneficial owner of the income. Agents, nominees, and conduit entities may not qualify merely because they receive the payment.
- Check permanent-establishment exposure. Maintaining personnel, premises, projects, or contract-concluding activities in the other territory may change the taxing outcome.
- Follow the applicable claim route. Depending on the circumstances, relief in Taiwan may be obtained through documentation supplied to the withholding agent, an advance application, an exemption application, or a refund of overpaid tax. Advance approval should not be described as a universal prerequisite for every treaty claim.
How Treaty Relief Procedures Compare
| Type of relief in Taiwan | Main issue to establish | Possible procedural route |
| Reduced rate on dividends, interest, or royalties | Residence, income classification, and beneficial ownership | Withholding documentation, a qualifying pre-approval procedure, or a refund claim |
| Business-profit exemption | Absence of a Taiwan permanent establishment and correct profit classification | Application for treaty-based business-profit exemption |
| Employment-income exemption | All short-term employment conditions are satisfied | Supporting documents submitted through the applicable assessment or filing process |
| Relief after excess withholding | Treaty eligibility and amount overpaid | Treaty-based refund application |
The exact documentation and competent tax office depend on the claimant and transaction. Taxpayers should select the official form matching the relief requested rather than treating every claim as the same approval process.
How the Income Tax Agreement Applies to Businesses
A Taiwan or South Korean enterprise may qualify for exemption from tax on business profits in the other territory if it does not carry on business there through a permanent establishment. If a permanent establishment exists, the other territory may tax the profits attributable to that establishment.
A permanent establishment can include:
- A fixed place of business, such as a place of management, branch, office, factory, or workshop
- A building site, construction, assembly, or installation project lasting more than six months
- Services furnished for periods aggregating more than 183 days within any 12-month period
- A person who habitually concludes contracts—or exercises relevant contract authority—on behalf of the enterprise
Activities performed by associated enterprises may need to be aggregated when applying the project or service duration tests. A facility maintained solely for storage, display, delivery, purchasing, or information gathering may fall outside the permanent-establishment definition where the activity remains preparatory or auxiliary.
For example, a South Korean enterprise earning service income from Taiwan should not assume that the income is exempt merely because it has no registered branch. It must review its physical presence, personnel days, project duration, contractual authority, and any connected activities in Taiwan.
Businesses may also access a maximum 10% source-country rate on qualifying dividends, interest, and royalties. Certain interest may be exempt. The reduced rate is subject to the agreement’s requirements, including beneficial ownership where applicable.
Comparison of Selected Domestic and Agreement Outcomes
| Income or activity | Potential treatment without agreement relief | Treatment under the agreement, if all conditions are met |
| Dividends | Taiwan’s domestic nonresident dividend withholding rate may apply | Source-country tax capped at 10% of the gross dividend |
| Interest | Applicable domestic withholding rate may apply | Source-country tax generally capped at 10%; certain interest may be exempt |
| Royalties | Applicable domestic withholding rate may apply | Source-country tax capped at 10% of the gross royalty |
| Business profits without a PE | Source-country tax exposure may otherwise arise under domestic rules | Taxable only in the enterprise’s residence territory |
| Technical service income earned in Korea without a PE | Korea could impose 22% withholding, including local income tax, in the example identified by Taiwan’s MOF | May be exempt from Korean tax as business profits |
| Business profits attributable to a PE | Source territory may tax under domestic law | Source territory may tax profits attributable to the PE |
The classification of a payment is critical. Calling a payment a “service fee” or “royalty” in a contract does not necessarily determine its treatment under the agreement.
How the Income Tax Agreement Applies to Individuals
Individuals who are treaty residents may benefit from reduced rates on qualifying dividends, interest, and royalties. The agreement also contains rules for employment income and other categories of personal income.
An employee who is resident in South Korea and performs employment duties in Taiwan cannot rely on the length of stay alone. Employment remuneration is generally exempt from Taiwan tax only when all relevant conditions are satisfied, including:
- The employee is present in Taiwan for no more than 183 days during the applicable 12-month period.
- The remuneration is paid by, or on behalf of, an employer that is not resident in Taiwan.
- The remuneration is not borne by a permanent establishment that the employer has in Taiwan.
Accordingly, a Korean employee working in Taiwan for between 91 and 183 days may qualify for exemption, but only if the employer and permanent-establishment conditions are also met. Payroll recharge arrangements, economic-employer considerations, and the actual entity bearing the remuneration should therefore be reviewed.
Resolving Double Taxation and Transfer-Pricing Disputes
The agreement includes a mutual agreement procedure. A resident who considers that the actions of Taiwan, South Korea, or both result—or may result—in taxation inconsistent with the agreement may present the case to the relevant competent authority within the required period.
The competent authorities may consult to resolve issues such as:
- Disagreement over residence or permanent-establishment status
- Inconsistent income classification
- Transfer-pricing adjustments resulting in double taxation
- Corresponding adjustments
- Bilateral advance pricing arrangements
The procedure can provide relief where ordinary domestic objections do not fully eliminate cross-border double taxation. However, taxpayers must still observe applicable filing deadlines and documentation requirements.
Final Points
The Taiwan–Korea income tax agreement creates meaningful opportunities to reduce withholding taxes, exempt qualifying business profits, address employment income, and resolve cross-border tax disputes. Its benefits are conditional rather than automatic.
Before filing a claim, taxpayers should establish treaty residence, classify the income correctly, confirm beneficial ownership where relevant, assess permanent-establishment exposure, and determine the correct procedural route. Early review is particularly important for service arrangements, employee assignments, royalties, intercompany payments, and projects involving personnel in both territories.
How Premia TNC Is Able to Provide Assistance
At Premia TNC, we support businesses and individuals with Taiwan tax compliance, treaty-benefit applications, withholding-tax reviews, residence documentation, refund claims, and permanent-establishment assessments. Our team can help identify the relevant agreement provision, prepare supporting documents, and coordinate the appropriate application or filing process.
FAQs
1. What is the purpose of the income tax agreement between Taiwan and South Korea?
The agreement helps prevent double taxation and fiscal evasion involving residents of Taiwan and South Korea. It allocates taxing rights, limits source-country tax on specified income, provides exemptions under defined conditions, and establishes administrative cooperation and dispute-resolution mechanisms.
2. What types of income are covered?
The agreement addresses business profits, dividends, interest, royalties, capital gains, employment income, pensions, independent personal services, international transport income, and other specified income. Each category has separate allocation rules and eligibility conditions.
3. Is advance approval required for every treaty benefit in Taiwan?
No. The procedure depends on the income and claimant. Some cases may use withholding documentation or a prescribed declaration, while others require pre-approval, an exemption application, or a refund claim. The taxpayer should use the official form and procedure applicable to the specific relief requested.
4. Does staying in Taiwan for fewer than 183 days automatically exempt an employee’s salary?
No. The employee must also satisfy the employer and permanent-establishment conditions under the employment-income article. Salary may remain taxable in Taiwan if it is paid by a Taiwan-resident employer or borne by the foreign employer’s Taiwan permanent establishment.
