A foreign supplier wins a breach of contract case in Seoul, but the award is lower than expected. The reason is not bias; it is how Korean contract damages are calculated. Korean courts apply the Civil Act’s strict rules on causation, foreseeability, and proof. Interest is also governed by statute and can materially change the final recovery.

For foreign businesses, understanding these rules is critical before filing or defending a claim. It affects how you frame your damages model, which documents you prioritize, and whether you negotiate early. Below is a practical guide grounded in the Korean Civil Act and key procedural rules.

The Core Legal Framework for Korean Contract Damages

Korean contract damages start with Article 390 of the Civil Act, which establishes liability for non-performance. But liability is only the first step. The amount of compensation is limited by the scope of recoverable loss and the evidence you can prove.

The main provisions are:

Article 393: Damages are limited to ordinary damages arising from the breach.
Article 393(2): Special damages are recoverable only if the breaching party foresaw or could foresee the circumstances.
Article 396: The creditor must mitigate damages where possible.
Article 398: Liquidated damages clauses are generally enforceable, but courts may reduce excessive amounts.

These articles define the boundaries of recovery in almost every commercial case.

Ordinary vs Special Damages: The Foreseeability Gate

The most important concept in Korean contract damages is the distinction between ordinary and special damages. Ordinary damages are the direct, normal losses that typically arise from breach. Special damages are additional losses that require proof of foreseeability.

Example: Ordinary Damages

A distributor fails to deliver goods on the contract date. The buyer’s ordinary damages include the price difference needed to cover replacement goods, plus incidental costs like expedited shipping.

Example: Special Damages

If the buyer loses a downstream government contract because of the late delivery, those losses are special damages. The buyer must show that the seller knew or should have known that the government contract depended on timely delivery.

This foreseeability standard is strictly applied. Courts often deny special damages when the chain of causation is too remote or when the parties did not share enough context during negotiations.

Proving Loss: Evidence Is the Real Battlefield

Korean courts require clear proof. Estimates and generalized business projections are rarely sufficient. Successful plaintiffs typically submit:

Executed contracts and purchase orders
Bank transfer records
Invoices and delivery confirmations
Internal emails showing the other party’s awareness of the risk
Expert reports to quantify lost profits

If you rely on lost profits, you must show a stable historical trend and a credible method for calculating the profit that would have been earned. Courts often prefer conservative calculations.

Liquidated Damages and Penalty Clauses

Many cross-border contracts include liquidated damages. Under Article 398 of the Civil Act, liquidated damages are valid but may be reduced if the amount is “unreasonably excessive.” This creates a strategic tension: set the amount high enough to deter breach, but not so high that a court will cut it.

A practical approach is to tie liquidated damages to a rational metric, such as a percentage of contract value or a fixed daily rate that reflects actual loss. If you can document the basis at the contract stage, courts are more likely to enforce it.

Statutory Interest: Pre-Judgment and Post-Judgment

Interest can dramatically change the economics of a case. Korea separates pre-judgment and post-judgment interest.

Pre-Judgment Interest

Pre-judgment interest is typically based on the Civil Act and related statutes. Historically, the statutory rate for civil claims has been 5% per year and for commercial claims 6% per year, although the rate can change by statute. Courts apply the rate from the date of breach or from the date of filing, depending on the claim.

Post-Judgment Interest

Post-judgment interest is governed by the Act on Special Cases Concerning the Promotion of Legal Proceedings. This rate is often higher than pre-judgment interest and is intended to encourage prompt payment after judgment. The exact rate is set by statute and can be updated.

For foreign plaintiffs, these rates can be lower than market financing costs. That reality should inform settlement strategy and timing.

Limitation Periods Matter More Than You Think

Even a strong damages case can fail if it is late. The general limitation period for contractual claims under the Civil Act is 10 years, but shorter periods may apply for certain commercial or sales claims. The key is to identify which statute applies to your contract type and to preserve evidence early.

In cross-border deals, the limitation period can be a trap. Parties often assume the home jurisdiction’s limitation rules apply. Korean courts will apply Korean limitation rules if Korean law governs the contract or if the claim is brought in Korea.

Strategic Considerations for Foreign Businesses

1) Drafting for Foreseeability

If you want to recover special damages, you must make the risk visible during contract negotiations. This can be done through:

A detailed statement of purpose in the contract
Milestone schedules with specific consequences
Notices explaining downstream obligations

The goal is to make it impossible for the counterparty to claim ignorance of the risk.

2) Structuring Liquidated Damages

Avoid a single inflated figure. Use a formula or tiered damages schedule. For example, a daily late-delivery amount that caps at a reasonable percentage of contract value. This increases enforceability under Article 398.

3) Evidence Preservation and Localization

Korean courts expect Korean-language evidence or certified translations. Building a bilingual evidence package early prevents costly delays later.

How Courts Quantify Lost Profits in Practice

Lost profit claims are common but difficult. Courts typically look for a stable baseline and a clear causal chain from breach to loss. If a foreign distributor claims it lost a major customer, the court will ask for historic margin data, sales trends, and evidence that the customer would have remained but for the breach.

A practical method is to present a “but-for” scenario based on past quarters, adjusted for known market conditions. Courts are skeptical of aggressive growth projections unless there are signed contracts or purchase orders supporting them. If the claimant is a startup, it is harder to prove lost profits because the historical record is short.

Set-Off, Contributory Negligence, and Mitigation

Defendants often argue that the claimant contributed to the loss or failed to mitigate. Under Civil Act Article 396, a creditor must take reasonable steps to reduce damages. If a buyer could have sourced replacement goods at a reasonable price but chose not to, the court may reduce the award.

Set-off is also common in long-term relationships. If both parties have outstanding obligations, the court may net the amounts. This can change not only the final recovery but also the interest calculation timeline.

Litigation vs Arbitration: Damages Perspective

When the contract includes a Korea-seated arbitration clause, the substantive damages rules typically still track the Civil Act. However, arbitration allows more flexible evidence handling and expert testimony. For foreign claimants, this can make it easier to present complex loss models, especially for technology or IP-heavy disputes. On the other hand, interim relief such as provisional attachment of assets may still require court involvement, which has its own standards and timing.

A strategic review of forum selection should therefore consider not only confidentiality and speed but also how effectively the forum can handle your damages evidence.

Partial Performance and Price Adjustments

In some disputes, the contract is partially performed and the debate centers on price adjustment rather than full damages. Korean courts will often separate the value of the partial performance from the remaining breach. This can reduce total recovery but also provide a clearer path to judgment if the performance value is objectively measurable. Parties should therefore preserve evidence of partial delivery, acceptance, and usage.

Practical Tips / Key Takeaways

Anchor damages to Civil Act Articles 393 and 398 from the outset.
Prove foreseeability through contemporaneous emails and contractual recitals.
Use credible loss calculations with conservative assumptions.
Plan for statutory interest rates when modeling expected recovery.
Check limitation periods early, especially in long-term supply contracts.

Conclusion

Korean contract damages are predictable if you know the rules. The Civil Act favors clear causation, foreseeable loss, and documented proof. For foreign businesses, the best litigation outcomes usually start long before a dispute begins—at the contract drafting and documentation stage.

Korea Business Hub can support foreign companies with dispute assessment, damages modeling, and litigation strategy, while coordinating related services such as debt recovery or enforcement of foreign judgments. If you need a Korea-ready litigation plan, we are ready to assist.

Korean Contract Damages: How Courts Calculate Loss and Interest