What Is "Other Korean-Source Income" for a Foreign Corporation in Korea?

Executive summary

Korea's Corporate Tax Act divides Korean-source income into ten statutory categories. The tenth category — "other income" — is a residual category: it generally applies only when income does not fall within any of the nine more specific categories.

That makes category 10 deceptively important. Payments such as contractual damages, insurance proceeds, prizes, certain asset transfers, and benefits arising from related-party capital transactions can fall within the category even though they may not look like conventional income.

For foreign non-profit corporations, a separate rule applies. A foreign non-profit corporation is generally taxed in Korea only on Korean-source income arising from a profit-making business, subject to a detailed list of activities that are specifically excluded from that definition.

The practical takeaway is simple: do not treat "other income" as the default category, and do not treat "non-profit" status as a blanket Korean tax exemption. Both questions require a more specific classification analysis.

Who should read this

• Foreign corporations receiving unusual or miscellaneous payments from Korea
• Foreign companies receiving Korean contractual damages, settlements, or insurance proceeds
• Foreign governments and public-sector entities operating in Korea
• Foreign non-profit organizations, foundations, associations, and educational or welfare institutions
• In-house Tax and Finance teams determining whether Korean activities are taxable
• Legal teams reviewing Korean-related restructuring or related-party transactions

The short answer

What is "other income" for a foreign corporation?

Other income is Korea's residual Korean-source income category.

It generally applies when income does not fall within one of the nine more specific categories, such as interest, dividends, business income, royalties, capital gains, or securities transfer gains.

Examples can include:

• Certain insurance proceeds, compensation, and damages
• Contractual penalties and cancellation payments
• Gifts of Korean-located assets
• Prizes and rewards
• Certain license- or permit-related rights
• Lottery and similar winnings
• Certain benefits arising from related-party capital transactions

The classification matters because the applicable Korean tax treatment can differ depending on the statutory category and any applicable tax treaty.

Are foreign non-profit corporations exempt from Korean corporate tax?

Not automatically.

A foreign non-profit corporation is generally subject to Korean corporate tax only on Korean-source income derived from a profit-making business, rather than on all Korean-source income.

However, whether an activity is a taxable profit-making business depends on the statutory rules and specific exclusions.

The important question is not simply "Is the organization non-profit?" It is "What activity is generating the Korean income?"

Quick comparison

Understanding "other income" and non-profit corporation taxation

Why does Korea have a tenth category?

The first nine categories capture specific types of Korean-source income, including interest, dividends, real estate income, ship/aircraft/equipment leasing income, business income, personal services income, capital gains, royalty income, and securities transfer income.

Category 10 exists to capture income that is Korean-source but does not fit neatly into those categories. This is why classification should begin with the more specific categories, not with category 10.

Category 10 is a safety net — not a starting point. For example, a payment described commercially as a "settlement payment" might initially appear to be miscellaneous income. But the underlying transaction may determine whether it is actually connected to a Korean business, Korean real estate, intellectual property, or another specific category.

What can fall within "other income"?

The category is broad. Depending on the facts, it can include the following.

Insurance, compensation, and damages. Certain insurance proceeds, compensation, or damages connected with Korean real estate, Korean-located assets, or a business operated in Korea can fall within the category. The underlying transaction matters more than the label attached to the payment.

Contractual penalties and cancellation payments. Certain damages or penalty payments arising from the breach or cancellation of a property-related contract can be Korean-source income. Importantly, the taxable amount is not necessarily the entire amount received. Where the payment compensates the recipient for an actual loss connected with the original contractual payment, that portion is treated differently from an amount received in excess of the underlying loss.

Practical example: Suppose a foreign company paid KRW 1 billion under a Korean-related contract and later receives KRW 1.3 billion following cancellation. The analysis should not simply begin with "the foreign company received KRW 1.3 billion of other income." The relevant question is what portion represents compensation for the original loss and what portion represents an economic gain exceeding that loss.

Gifts of Korean-located assets. Income arising from receiving a gift of assets located in Korea can fall within the category. This is another example of why the Korean-source rules are broader than a simple list of payments for services or investments.

Prizes and rewards. Certain prizes, rewards, bonuses, and similar amounts paid in Korea can also fall within category 10.

Domestic licenses, permits, and similar rights. Income connected with rights established under a Korean license, permit, or similar governmental disposition can fall within this category, as can income from transferring certain domestic assets other than real estate.

Lottery and betting-related winnings. The category also covers specified winnings connected with Korean-issued lottery tickets and certain other Korean betting or prize arrangements. These provisions are unlikely to affect most multinational groups, but they illustrate the breadth of the residual category.

Related-party capital transactions: a less obvious category 10 issue

One of the less obvious areas concerns certain benefits received by a foreign related-party shareholder as a result of a capital transaction involving a Korean corporation.

In specific circumstances, an increase in the value of shares or equity interests held by a foreign related party can be treated as Korean-source "other income" where an economic benefit is transferred from another related shareholder through a transaction covered by the relevant tax rules.

This is not a typical withholding-tax scenario that Finance teams encounter every month. But it matters when reviewing group restructurings, capital contributions, share transfers, related-party capital transactions, and transactions involving multiple shareholders.

A special issue: foreign-registered intellectual property used in Korea

There is another unusual rule worth knowing. Certain damages, compensation, settlement payments, lost profits, or similar amounts paid in Korea for infringement of intellectual property may be treated as Korean-source income where the relevant right is registered abroad rather than in Korea, provided the underlying manufacturing method, technology, or information is actually implemented or used in Korea under the applicable rules.

This can become relevant in disputes involving technology infringement, Korean manufacturing, foreign patents, licensing arrangements, and cross-border settlements. The key point is that formal Korean registration is not necessarily the only question. The actual use of the underlying technology or information in Korea can matter.

The broad residual rule

Beyond the specifically listed items, the category can also capture certain income from a business operated in Korea, personal services performed in Korea, economic benefits connected with Korean-located assets, and other income specified under the relevant enforcement rules.

This reinforces an important principle: the ten categories should be analyzed together rather than treated as ten completely isolated boxes. A payment may look like "other income" until the underlying facts reveal that it is actually business income, royalty income, capital gain, or another more specific category.

How are foreign non-profit corporations taxed in Korea?

The rules change significantly when the foreign corporation is a non-profit entity. A foreign non-profit corporation can include certain foreign governments, foreign local authorities, public institutions, foundations, associations, and other entities treated as non-profit corporations under Korean tax rules.

The key distinction is the scope of taxable income.

For-profit foreign corporation: Korean-source income across the relevant statutory categories can generally be subject to Korean corporate tax.

Foreign non-profit corporation: Generally, only Korean-source income derived from a profit-making business is within the Korean corporate tax framework. This does not mean that every activity generating revenue is automatically taxable. Nor does it mean that every activity conducted by a non-profit organization is automatically exempt. The analysis is activity-specific.

What is a "profit-making business"?

The Korean rules generally use the Korean Standard Industrial Classification framework to identify business activities. However, certain activities are specifically excluded from the definition of a taxable profit-making business. The exclusions cover a range of public-interest activities.

The important point is that these exclusions are specific, not a general exemption for anything that sounds charitable or public-interest oriented.

Non-profit status is not the same as tax exemption

This is one of the most important practical points for foreign non-profit organizations.

Consider an organization that operates two activities in Korea. Activity A is a qualifying educational program that falls within a statutory exclusion. Activity B is a separate consulting or commercial service that does not fall within an excluded category.

The organization's overall non-profit status does not necessarily make the income from Activity B exempt. The analysis should instead be performed activity by activity.

The tax question follows the activity that generates the income — not simply the legal label of the organization.

Education and welfare activities require particular care

It is tempting to assume "education is non-profit, so it is exempt." That is too broad. The statutory exclusions refer to specific types of institutions and activities operating under specified Korean laws. The same applies to welfare activities.

A foreign organization should therefore confirm: what type of institution is operating in Korea, under which Korean law it operates, what activity actually generates the revenue, and whether that activity falls within one of the specifically listed exclusions.

Religious organizations: a particularly narrow exclusion

Religious organizations also receive a specific exclusion, but it is not a blanket exemption for every activity they conduct. The exclusion is tied to services that are VAT-exempt under the Korean VAT Act and to qualifying religious organizations.

This creates an important distinction between the organization's overall religious or non-profit status and the specific activity generating Korean revenue. A commercial activity conducted by a religious organization therefore needs to be reviewed separately.

Practical insight: ask whether value shifted, not just whether there was a gain

When reviewing a cross-border restructuring, do not limit the tax analysis to "is there a gain on the share transfer?"

Practical insight: a non-profit organization's own label is not the answer

A foreign non-profit organization should not rely solely on its articles of incorporation or overseas tax-exempt status when determining its Korean corporate tax position.

What foreign companies often get wrong

1. Treating category 10 as a default. A payment doesn't become "other income" merely because the parties don't know which category applies. Better approach: work through the nine specific categories first, then use category 10 only if the payment genuinely falls outside them.
2. Assuming "non-profit" means "tax-exempt." Foreign non-profit status does not automatically exempt all Korean activities. Better approach: identify each Korean revenue-generating activity and test it against the Korean profit-making-business rules and statutory exclusions.
3. Assuming education or welfare is automatically exempt. Not every educational or welfare activity falls within the statutory exclusions. Better approach: confirm the specific institution, governing law, and nature of the activity.
4. Ignoring the underlying transaction. A payment's commercial label — "settlement," "compensation," "bonus," "reimbursement," or "damages" — does not necessarily determine its Korean tax classification. Better approach: start with the legal and economic substance of the transaction that generated the payment.
5. Focusing only on the recipient. For unusual cross-border payments, Finance teams sometimes ask "who received the money?" The more important question can be "why was the money paid?" The underlying asset, contract, business activity, or transaction can determine the Korean-source classification.

Frequently asked questions

Practical checklist

Before treating a payment as Korean-source "other income," ask:

• Does the payment fit interest, dividend, real estate, leasing, business, personal services, capital gains, royalty, or securities transfer income?
• What is the underlying transaction that generated the payment?
• Is the payment connected with Korean real estate, a Korean business, Korean-located assets, or Korean intellectual property use?
• If the payment represents damages or compensation, does it merely compensate an actual loss or exceed that loss?
• Does a related-party capital transaction involve a transfer of economic value between shareholders?

For a foreign non-profit corporation:

• What specific activity generated the Korean income?
• Is that activity a "profit-making business" under the Korean classification rules?
• Does a statutory exclusion apply?
• If relying on an education or welfare exclusion, does the institution satisfy the specific legal requirements?
• If relying on the religious-organization exclusion, are the relevant services VAT-exempt?
• Is the organization's foreign tax-exempt or non-profit status being incorrectly treated as equivalent to Korean tax exemption?

Key takeaways

1. "Other income" is a residual category, not a default classification.
2. The underlying transaction matters more than the payment label.
3. Contractual damages and settlement payments require analysis of what the payment actually compensates for.
4. A foreign non-profit corporation is not automatically exempt from Korean corporate tax.
5. For non-profit entities, the analysis is activity-by-activity — not organization-wide.
6. Education, welfare, religious, and other public-interest exclusions are specific statutory exclusions, not broad policy-based exemptions.

The practical question is rarely "is this organization non-profit?" or "is this payment miscellaneous?" The better question is: what activity, asset, right, or transaction actually generated the Korean-source income?

Related guides

• Korean-Source Income for Foreign Corporations: Interest, Dividends, Real Estate, and Business Income
• Korean-Source Income for Foreign Corporations: Personal Services, Capital Gains, Royalties, and Securities
• How Is a Foreign Corporation Taxed in Korea? The Corporate Tax Framework Explained
• Withholding Tax in Korea: What Foreign Businesses Need to Know (coming soon)
• Transfer Pricing for Korean Subsidiaries (coming soon)
• Surviving a Korean Tax Audit: A Field Guide for Foreign-Invested Companies (coming soon)