How Korean Courts Calculate Commercial Damages in 2026

A contract breaks down, the counterparty stops paying, and your finance team wants a simple answer: “How much can we recover in Korea?” The calculation is not a plug‑and‑play formula. Korean courts apply a structured damages analysis grounded in the Civil Act, and the outcome depends on how you document loss, causation, and foreseeability.

For foreign companies, the biggest surprise is often that Korean courts are conservative about speculative losses. If your internal models are not tied to concrete evidence, the court may reduce the claim significantly. This guide explains how Korean courts calculate commercial damages in 2026, which Civil Act provisions matter most, and how to build a claim that stands up to judicial scrutiny.

How Korean courts calculate commercial damages: the legal foundation

The central statutory provisions are in the Civil Act:

• Civil Act Article 393 (scope of damages) provides that damages for nonperformance are limited to the ordinary damages arising from the breach.
• Civil Act Article 394 (special damages) permits recovery for special damages only if the breaching party knew or could have known those circumstances.
• Civil Act Article 397 (interest on damages) provides that a debtor is liable for interest on damages from the time of delay.

Together, these provisions create a three‑step inquiry: (1) identify ordinary damages, (2) determine whether special damages are foreseeable, and (3) calculate interest based on the timing of default and judgment.

Ordinary damages vs special damages

Ordinary damages (Article 393)

Ordinary damages are those that naturally arise from the breach in a typical scenario. For example, if a supplier fails to deliver goods, the ordinary damages include the cost of purchasing substitute goods at a higher price. Courts look for a clear causal chain and reliable documentation such as purchase orders, invoices, and delivery records.

Special damages (Article 394)

Special damages are losses that occur because of unusual circumstances known to the breaching party. For instance, if a delayed shipment causes a downstream customer to cancel a large order, those lost profits may qualify only if the supplier knew about the downstream contract or the urgency. In practice, special damages are where foreign claimants often fall short because the evidence of notice is weak.

Evidence that drives damages outcomes

Korean courts rely heavily on documentary evidence. The best damages arguments combine statutory alignment with concrete business records.

Key evidence types

• Contracts and amendments showing the specific obligations and delivery timelines
• Invoices and payment schedules that quantify the financial impact
• Internal forecasts that are supported by historical sales data
• Board minutes or correspondence demonstrating notice of special circumstances
• Expert reports for complex valuation issues (used selectively)

When foreign companies use internal projections without tying them to external market data or historical performance, courts often treat them as speculative and reduce the damages award.

Foreseeability and notice: why communications matter

In common‑law jurisdictions, parties often rely on broader discovery to establish foreseeability. Korea is different. The court expects you to show that the breaching party knew or should have known about special circumstances at the time of contracting.

Practical examples:

• If you are relying on lost profits, document that the counterparty was aware of your customer contracts or delivery commitments.
• If you need expedited performance, document the deadlines in writing, not just verbally.
• If you are in a regulated industry, show that the counterparty knew regulatory timelines or license conditions.

These communications can transform a weak special‑damages claim into a credible one under Civil Act Article 394.

Interest calculation and timing strategy

Under Civil Act Article 397, interest accrues from the time of delay. In commercial disputes, courts often distinguish between the date of breach, the date of formal demand, and the date a claim is filed. This is why a clear, written demand letter can materially affect the interest calculation.

For foreign companies, a well‑timed demand letter serves three purposes:

1. It fixes a clear delay date.
2. It strengthens evidence of notice for special damages.
3. It puts the counterparty on formal notice for settlement leverage.

If you are dealing with a debt claim, early demand letters are often the cheapest way to add leverage without escalating to litigation immediately.

How Korean courts treat lost profits

Lost profit claims are possible in Korea but are scrutinized closely. Courts typically require:

• A stable historical revenue base
• A clear causal link between breach and lost profits
• A reliable calculation methodology

If your business is early‑stage or the contract is new, courts may treat projections as speculative. This does not mean you cannot recover lost profits; it means you need to document why the profits are not hypothetical. For example, a confirmed downstream purchase order, a locked‑in resale contract, or a multi‑year framework agreement can make the difference.

Mitigation and substitute transactions

Korean courts generally expect the non‑breaching party to mitigate losses. If you could have obtained substitute goods or services at a reasonable price, the court may reduce damages for failure to mitigate. This aligns with the concept of ordinary damages under Civil Act Article 393.

Document your mitigation steps carefully:

• Quotes from alternative suppliers
• Attempts to renegotiate delivery schedules
• Internal decisions explaining why alternatives were not feasible

This documentation not only protects your damages claim but also strengthens your credibility.

Practical litigation strategy for foreign companies

1) Build a damages file early

Do not wait until litigation begins. Create a damages folder as soon as a dispute appears. Include contracts, invoices, email chains, and internal notes on operational impact. Early preparation often determines the strength of your eventual claim.

2) Use preliminary measures when needed

If you are concerned about asset dissipation, you may consider provisional remedies such as asset attachment. This is a separate strategic decision but it affects your leverage and settlement position in damages disputes.

3) Align with enforcement planning

A damages judgment is only valuable if it is enforceable. If the counterparty has limited assets in Korea, you may need cross‑border enforcement planning early in the case. This is especially relevant for foreign plaintiffs dealing with Korean subsidiaries or joint ventures.

Comparing with US/UK practice

US and UK courts are often more open to broader discovery and reliance on expert testimony for lost profits. Korean courts emphasize documentary evidence and straightforward causation. This means that foreign plaintiffs should adjust their litigation expectations and focus on building a clean paper trail rather than relying heavily on expert models alone.

Currency, exchange rates, and USD reporting

Foreign claimants often prepare internal damage models in USD, but Korean courts issue judgments in KRW. The court will typically convert the amount based on the exchange rate at a legally relevant time, which may be the time of breach or the time of judgment depending on the claim structure. This is another reason why clear documentation of the breach date and demand date matters.

When preparing pleadings, provide a KRW calculation alongside a USD reference. It helps the court validate the numbers and reduces friction when interest is calculated under Civil Act Article 397. If your contracts are denominated in USD, emphasize the contractual currency and the payment clause, and show how the exchange rate movement affected the actual loss.

Practical tips / key takeaways

• Civil Act Article 393 limits damages to ordinary, foreseeable losses, so document the direct impact of breach.
• Civil Act Article 394 allows special damages only with clear notice; put critical circumstances in writing.
• Civil Act Article 397 makes interest timing important; send a formal demand letter early.
• Use substitute transaction evidence to demonstrate mitigation and strengthen your claim.
• Consider enforcement strategy at the start, not after judgment.
• Internal coordination with company‑setup and compliance teams helps prevent disputes from arising.

Conclusion

Understanding how Korean courts calculate commercial damages is essential for foreign companies operating in Korea. The legal framework is clear, but outcomes depend on how well you document loss, foreseeability, and timing. When you build a structured record and align your claim with Civil Act Articles 393, 394, and 397, you maximize recovery and improve settlement leverage.

Korea Business Hub supports foreign businesses in Korea litigation, debt collection, and dispute prevention. If you are facing a contract dispute or need to quantify damages before litigation, we can help build a strategy that protects your commercial position.