In the world of contracts and legal agreements, the term force majeure plays a crucial role. It refers to unforeseen events that prevent parties from fulfilling their contractual obligations. Understanding these clauses is essential for businesses and individuals to navigate unexpected disruptions, allocate risk fairly, and maintain commercial relationships even when circumstances turn chaotic. Whether you are drafting a simple service agreement or a complex international supply contract, a well-crafted force majeure clause can determine whether your business survives a crisis—or gets buried under liability. In this comprehensive guide, we break down every aspect of force majeure: what it is, how it works, what courts look for, and how to draft clauses that stand up to real-world stress.

What Is a Force Majeure Clause?

A force majeure clause is a contractual provision that frees both parties from liability or obligation when extraordinary events occur that are beyond their control. The term originates from French law, meaning “superior force,” and modern force majeure clauses are found in virtually every commercial contract. They are not automatic under most legal systems; you must explicitly include them to benefit from their protections. Without such a clause, parties can be held liable for non‑performance even if a hurricane or pandemic made performance impossible.

At its core, a force majeure clause operates as a risk‑sharing mechanism. When an event listed in the clause—or one that meets the general definition—makes performance impossible or impractical, both parties are excused from performance for the duration of the event, and often from liability for damages caused by non‑performance. This prevents either side from being penalized for something neither could control. The scope and trigger events vary widely. Some clauses are narrowly drafted to cover only “Acts of God” such as earthquakes or hurricanes. Others are broad, covering everything from cyberattacks to pandemics. The exact language determines whether a particular crisis qualifies.

Historical Background

Force majeure concepts have existed for centuries. Roman law recognized the principle of vis major (superior force) as a defense against breach. Later, French civil law codified force majeure in the Napoleonic Code, and English common law developed the doctrine of frustration of purpose. However, the modern commercial force majeure clause is a creature of contract, not of general law. Because courts are reluctant to rewrite contracts, parties must negotiate these protections explicitly. The COVID‑19 pandemic further reshaped the landscape, prompting many jurisdictions to update their statutory frameworks and guiding case law.

Common Events Covered by Force Majeure

Most force majeure clauses enumerate specific categories of events. While the list can be tailored to the industry, the following are typical examples:

  • Natural disasters such as earthquakes, floods, hurricanes, tornadoes, volcanic eruptions, and wildfires.
  • Wars, terrorism, and political unrest including armed conflict, civil war, insurrection, sabotage, and terrorist attacks.
  • Pandemics and widespread health emergencies (notably included after COVID‑19). Many contracts now explicitly reference “epidemic,” “pandemic,” or “public health emergency.”
  • Strikes and labor disputes whether involving the performing party’s own employees or third parties (e.g., port workers).
  • Government actions or legal restrictions such as embargoes, trade sanctions, confiscation, expropriation, and orders from regulatory bodies that block performance.
  • Infrastructure failures including power outages, internet blackouts, or transportation network collapses that are not caused by the party seeking relief.
  • Cyber events such as large‑scale hacks, ransomware attacks, or server failures—increasingly common in modern contracts.
  • Supply chain disruptions that result from any of the above, though many contracts now add a standalone “supply chain interruption” clause.

It is important to note that simply labeling an event as “force majeure” is not enough. The event must actually prevent, hinder, or delay performance, and the clause must explicitly cover that type of event or use a broad “catch‑all” phrase. For example, a contract that only lists “hurricane” may not cover a prolonged port closure caused by a hurricane if the clause requires the event to directly affect the performing party’s own facilities.

Even if an event appears to fall within the clause, a party must meet several legal thresholds to successfully rely on it. Courts scrutinize these requirements carefully, especially in high‑value disputes.

Causation: The Event Must Cause Non‑performance

The force majeure event must be the direct cause of the inability to perform. If a party could have performed despite the event—for example, by using alternative suppliers or methods—the clause may not excuse performance. This is often the most contested issue in force majeure disputes. For instance, if a factory is closed due to a government lockdown, but the company could have shifted production to an unaffected facility, the clause may not apply. The claiming party must prove a clear chain of causation linking the event to the specific obligation it failed to meet.

Impossibility vs. Impracticability

Many force majeure clauses require performance to be impossible, not merely more expensive or inconvenient. Others use a lower standard of commercial impracticability, which excuses performance when it would be unreasonably costly or commercially unreasonable. The language chosen makes a huge difference. For instance, a supplier hit by a port closure might argue impracticability if shipping by air costs three times as much, but a court may reject that if the contract requires “impossibility.” In common law jurisdictions, “impossibility” is interpreted strictly; even a 500% cost increase may not qualify unless it is literally impossible to perform.

Notice Requirements

Virtually all force majeure clauses require the affected party to promptly notify the other side. Typical notice periods range from 24 hours to 30 days. Failure to provide timely notice can waive the right to claim force majeure. The notice should describe the event, its effect on performance, and the expected duration. Some clauses also require ongoing updates every few days. A best practice is to send notice even if the full impact is unknown, with a promise to provide more details later.

Mitigation Obligations

The party seeking relief must take reasonable steps to mitigate the impact of the force majeure event. That might mean finding alternative suppliers, rerouting shipments, or using substitute employees. If the party does nothing and simply stops performing, the force majeure defense may fail. The obligation to mitigate can also include using force majeure‐type defenses to request extensions from sub‑contractors. Courts generally hold that mitigation efforts must be commercially reasonable, not heroic.

Limitations and Exclusions

Force majeure clauses are not magic shields. Courts often interpret them strictly, and many contain explicit exceptions that can surprise unwary parties.

Foreseeability

If an event was foreseeable at the time the contract was signed—and the party did not address it—a court may deny force majeure relief. For example, after the 2011 Japan earthquake, some contracts excluded earthquakes because they were foreseeable in that region. COVID‑19 has now made pandemics a “known risk,” so future contracts may either list them explicitly or exclude them entirely. The better approach is to include a broad catch‑all that covers even foreseeable events if they were not specifically contemplated.

Excluded Events

Many clauses specifically exclude:

  • Economic hardship (e.g., price increases, currency fluctuations, loss of funding).
  • Negligence or misconduct of the claiming party.
  • Strikes by the claiming party’s own employees if the clause only covers third‑party strikes.
  • Normal weather conditions (e.g., seasonal rain that is anticipated).
  • Government actions that the party could have reasonably avoided (e.g., failing to obtain a necessary permit).

Commercial Impracticability and Market Volatility

Pure market fluctuations—like a sudden 50% spike in raw material costs—are almost never considered force majeure events. Unless the clause explicitly includes “supply chain disruption” or “price volatility,” courts will generally hold parties to their bargain. Some contracts use a “hardship” clause as a separate mechanism to address extreme economic shifts. Hardship clauses allow for renegotiation rather than outright excusal of performance, and they typically require the event to fundamentally alter the equilibrium of the contract.

Drafting Best Practices for Force Majeure Clauses

Given the stakes, careful drafting is essential. A boilerplate clause copied from an online template can be dangerously vague. Here are key elements to address when you write or update a force majeure clause.

Define the Events with Specificity and a Catch‑All

List every foreseeable event relevant to your industry, but also include a catch‑all such as “any other event beyond the reasonable control of the affected party” to cover unforeseen circumstances. Without a catch‑all, a pandemic or cyberattack that was not specifically named may not qualify. For industries like construction, add “subsurface conditions,” “adverse weather beyond historical averages,” and “delays in governmental approvals.”

Set Clear Notice Procedures

Specify when, how, and to whom notice must be given. Use concrete deadlines (e.g., “within five business days of the onset of the event”) and require the notice to include a description, estimated duration, and proposed mitigation plan. Also require the affected party to provide periodic updates—weekly is common—until the event ends.

Define the Duration and Consequences

What happens if the force majeure event lasts beyond a certain period? Common options include:

  • Suspension of obligations without penalty while the event continues.
  • Right to terminate after a specified period (e.g., 90 days) if the event persists.
  • No liability for delay or non‑performance, but no right to terminate (leaving the contract in limbo).
  • Partial relief (e.g., excusing only a portion of obligations).
  • Option to substitute performance (e.g., allowing the supplier to deliver a different product of equivalent value).

Allocate the Risk of Mitigation Costs

Who pays for alternative performance? For example, if a supplier uses a more expensive shipping method, who bears the extra cost? The clause should state whether the affected party must bear that cost, share it, or be excused from seeking mitigation beyond a reasonable threshold. If the clause is silent, courts will often require the affected party to bear the cost as part of its duty to mitigate.

Include a Force Majeure Clause in Every Critical Contract

Many business owners overlook force majeure in smaller agreements, but those are often the very contracts that can cause the most disruption. Make it standard practice. Also consider cascading clauses: if a subcontractor triggers force majeure, the prime contractor should be able to invoke it against the client. A well‑drafted clause creates a chain of protection.

Because laws vary by jurisdiction and industry, always have a qualified attorney review your force majeure language. For cross‑border contracts, consider referencing the ICC Force Majeure Clause as a model. The ICC provides three variants: strict impossibility, impracticability, and a hybrid. Also consider the UNIDROIT Principles of International Commercial Contracts, which contain provisions on force majeure and hardship that can be adopted by reference.

Case Studies and Real‑World Examples

Recent history provides vivid illustrations of how force majeure clauses are tested in practice. Examining these cases helps refine your own drafting.

COVID‑19 Pandemic

The pandemic triggered countless force majeure claims worldwide. Many businesses argued that government lockdowns, travel bans, and supply chain disruptions made performance impossible. Courts were cautious: some ruled that the pandemic itself was force majeure, while others required the claimant to prove a direct causal link—for example, that a specific government order directly prevented performance, not just that the pandemic generally affected demand. The result has been a wave of contract amendments and increased attention to pandemic‑specific language. For more analysis, see the Cornell Legal Information Institute’s force majeure overview.

The 2021 Suez Canal Blockage

When the Ever Given container ship blocked the Suez Canal for six days in March 2021, hundreds of vessels were delayed. Many shipping contracts contained force majeure clauses covering “canal blockage” or “navigational obstruction,” but those that did not had to rely on vague “Acts of God” or “government action” language. The incident demonstrated the need for industry‑specific terms. Carriers that had updated their clauses after the 2017 Panama Canal expansion fared better. Insurers noted a 30% increase in force majeure claims after the blockage.

Cyberattacks on the Maritime Industry

In 2023, a major ransomware attack shut down global port operations for weeks. Many carriers invoked force majeure, but their contracts only listed “cyberattacks” if they were added after 2018. Older contracts lacked that term, forcing parties to rely on vague “catch‑all” language. The lesson: update your force majeure clause regularly—at least every two years—to reflect emerging risks. Cyber insurance and force majeure clauses should be coordinated so that one does not void the other.

Force Majeure in Different Jurisdictions

The interpretation of force majeure clauses can vary dramatically depending on the governing law selected in the contract. Understanding these differences is critical for any cross‑border agreement.

Common Law Jurisdictions (U.S., U.K., Canada, Australia)

Common law courts tend to interpret force majeure clauses strictly, giving effect to the exact words used. They rarely imply terms that are not written. The doctrine of frustration of purpose can sometimes provide relief when no force majeure clause exists, but its threshold is very high—the event must render the contract radically different from what was contemplated. Therefore, the contractual clause is the primary—and often only—safety net. In the U.S., the Uniform Commercial Code (UCC) Section 2‑615 provides a default rule of “commercial impracticability” for goods contracts, but it is often displaced by an express force majeure clause.

Civil Law Jurisdictions (France, Germany, most of Latin America and Asia)

Civil law systems often have a default force majeure principle in their codes (e.g., Article 1218 of the French Civil Code). Even if the contract is silent, a party may be excused by an event that is “unforeseeable, irresistible, and external.” However, the specific contractual clause can override or supplement the default rules. In Germany, the BGB (Civil Code) recognizes force majeure in Section 206 and also has specific rules for impossibility and frustration. International contracts governed by the UNIDROIT Principles or the CISG (Convention on Contracts for the International Sale of Goods) also have provisions for hardship and force majeure (e.g., CISG Article 79).

Choice of Law Matters

When drafting a contract that crosses borders, the choice of law directly affects how a force majeure claim will be assessed. Many experienced parties elect the laws of a neutral state (e.g., New York or England) and specify that the ICC or LCIA will handle disputes. If the contract involves parties from countries that have adopted the IBA’s guidelines on force majeure, referencing those guidelines can provide added consistency.

Common Misconceptions About Force Majeure

Even experienced businesspeople often misunderstand key aspects of force majeure. Clearing up these misconceptions can prevent costly mistakes.

  • Misconception: Force majeure is automatic. Truth: It only applies if the contract includes it, and then only if the specific event is covered.
  • Misconception: Any event that makes performance more expensive is force majeure. Truth: Courts require impossibility or impracticability, not mere difficulty or cost increase.
  • Misconception: You can claim force majeure without notifying the other party. Truth: Notice is a condition precedent; missing the deadline can waive the right.
  • Misconception: Force majeure suspends the contract indefinitely. Truth: Most clauses have a time limit, after which either party can terminate.
  • Misconception: A party that contributed to the event can still claim force majeure. Truth: If the party’s own negligence or misconduct caused the event, the clause will not protect it.

Practical Steps When a Force Majeure Event Occurs

If you believe a force majeure event has affected your performance, take these steps immediately. Acting quickly and methodically preserves your rights and reduces the risk of a dispute.

  1. Review your contracts to identify all force majeure clauses and any notice requirements. Make a list of every contract that may be affected.
  2. Send prompt written notice to the other party, even if you are not yet certain of the full impact. Use email and certified mail. Include the event, the specific obligations affected, and a preliminary estimate of duration.
  3. Document everything—government orders, news reports, correspondence with suppliers, financial records showing the impossibility of performing. Create a chronological file.
  4. Explore mitigation options. Document why each option is impractical or impossibly expensive. If you find an alternative, implement it and track costs.
  5. Communicate transparently with your counterparty. A collaborative approach often yields better results than confrontational legal arguments. Consider agreeing to a temporary suspension or a revised schedule.
  6. Seek legal advice early. Force majeure claims are fact‑intensive, and a small misstep—like a late notice—can forfeit your rights. An attorney can also help you determine whether you have a claim or whether the other party has a valid defense.
  7. Plan for the aftermath. Once the force majeure event ends, you will need to resume performance. Have a restart plan ready, including any necessary adjustments to deadlines or quantities.

Conclusion

Understanding and properly drafting force majeure clauses can help mitigate risks and provide legal clarity during unforeseen events. Both parties should review these provisions carefully before signing any agreement, and revisit them regularly as circumstances change. A well‑drafted clause does not just protect you when disaster strikes—it strengthens the entire contractual relationship by setting clear expectations for how the unexpected will be handled. In an increasingly interconnected and volatile world, the force majeure clause is not a mere technicality; it is an essential pillar of sound business planning. By paying attention to the details covered here—definitions, notice, mitigation, jurisdiction, and regular updates—you can build contracts that withstand the next crisis.

For further reading, the International Bar Association offers comprehensive guidance on force majeure in international contracts, and the UNIDROIT Principles provide a model framework for hardship and force majeure. Additionally, industry‑specific publications from the American Bar Association or local chambers of commerce can help you tailor clauses to your sector.