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The Basic Rules of the Game: When and Under What Conditions Can You Change an Existing Contract?

For these situations, the Czech legal framework offers a specific tool: Section 1752 of the Civil Code. Under precisely defined circumstances, this provision allows for changes to be made to general terms and conditions without the need to conclude a separate amendment with each partner. Although in practice this is often referred to as a "unilateral change," from a legal perspective, it is more of a pre-agreed mechanism for proposing a change to the other party, which they may or may not accept.

Statutory Prerequisites for Amending GTCs

To use this mechanism, several key conditions must be met cumulatively (i.e., simultaneously). If even one is missing, any attempt to amend is invalid, and you must revert to a classic agreement and a written amendment:

• Long-term contracts for recurring performance: The option to amend applies only to contracts establishing a lasting business relationship, not one-off transactions. Typically, these are framework agreements for the supply of goods, provision of services (e.g., IT, marketing), license agreements, or lease agreements.

• Ordinary course of business with a larger number of persons: This tool is intended for standardized contracts that you use for a wide range of customers. Examples include telecommunications service providers, energy suppliers, banks, or software platform operators (SaaS). It cannot be applied to highly individualized contracts tailored for a single specific partner.

• A reasonable need for a subsequent change: This is one of the most important and often disputed points. It must be clear from the nature of the contract at the time of its conclusion that a need to adjust the terms will likely arise in the future. The reason for the change cannot be circumstances that you must have already anticipated when concluding the contract. 

Typical legitimate reasons include changes in legislation, the introduction of new technology affecting the provision of the service, significant and unforeseeable market changes (e.g., a surge in inflation, major currency fluctuations), or a change in regulatory requirements.

• Express provision in the contract: The right to amend GTCs in this way does not arise automatically by law. It must be explicitly enshrined in the original contract. Without this clause, any attempt at an "ultimatum-style change" is invalid.

The ability to flexibly change terms is not a problem you should address only when it arises. It is a strategic advantage that you must build into your contractual relationships from the very beginning. Many companies realize the need for a change only when it is too late, and their contracts do not contain the necessary mechanism. A routine operational adjustment thus turns into a complex and risky negotiation of an amendment, where your partner is in a significantly stronger position.

When preparing or reviewing your contracts and GTCs, the lawyers at ARROWS ensure that the clause on the possibility of future amendment is formulated precisely, in accordance with the law and your business intent, thereby securing the necessary flexibility and preventing future disputes.

Key Legal Concepts You Must Know

When working with general terms and conditions, you will encounter several technical terms. Understanding them is crucial for setting up your contracts correctly.

• Contract of adhesion: Your terms and conditions are typically presented on a "take it or leave it" basis. The customer has no real opportunity to negotiate their wording. Such contracts are called contracts of adhesion. Precisely because the other party is in a weaker position (unable to influence the content), the law provides them with increased protection, even in business-to-business relationships.

• Mandatory provision: Some provisions of the law are so-called mandatory provisions, which means they cannot be contractually deviated from. Even if your partner signed a contract that violated these rules, such an agreement would be invalid. In the context of Section 1752 of the Civil Code, it is crucial that the other party's right to reject the change and terminate the contract is mandatory and cannot be limited or excluded in any way.

The Amendment Process in Practice: How to Proceed and What Rights Does Your Business Partner Have?

If your contract meets all the statutory prerequisites, you can proceed with the amendment process itself. It has clearly defined rules and a dynamic that can be described as "take it or leave it." Your partner has only two options: either accept the new terms or terminate the contractual relationship.

The Partner's Inalienable Right: Rejection and Termination

The most important element of the entire process is the absolute right of the other contracting party to reject the proposed change and terminate the obligation for this reason. Any provision in your GTCs that would condition this right on the payment of a contractual penalty, severance, or other sanction is invalid by law and is disregarded. The aim of the law is to ensure that the partner's decision is genuinely free and not made under duress.

The Key Factor: A Reasonable Notice Period

The law stipulates that the notice period must be "sufficient to procure similar performance from another supplier." What does this mean in practice?

The term "reasonable" is not defined by a number of days, but by the real possibility for your partner to secure a replacement without significant disruption to their operations. The length therefore varies from case to case:

• For supplies of common consumables or easily replaceable services, a period of 30 days may be reasonable.

• For a complex software solution that is deeply integrated into the client's processes and whose migration takes months, a reasonable notice period could be as long as 6 to 12 months.

The burden of proof that the agreed notice period is indeed reasonable lies with you as the party initiating the change. If you set it too short, your partner can successfully challenge it in court, which may lead to the invalidity of the entire change.

The lawyers at ARROWS will help you determine and justify a reasonable notice period based on an analysis of the market and the nature of your performance. This minimizes the risk of the period's length being successfully challenged.

Method of Notification: Form is as Important as Content

Even a perfectly prepared change can fail due to poor communication. The way you announce the change must be in line with what you originally agreed upon in the contract. Above all, it must be transparent, provable, and comprehensible.

Lessons from practice show that trying to "hide" the notification of a change in less visible communication channels does not pay off. A well-known case involves a payment gateway provider that informed clients about the introduction of a new fee only in the system's internal administration interface. Many clients who did not actively use the system never learned about the change. Such a procedure was evaluated as insufficient and problematic because it did not realistically allow clients to react to the change.

Key Risks in Amending GTCs and Their Solutions with ARROWS

The following table summarizes the most common problems companies face when amending GTCs and shows how we at ARROWS can help you prevent them. This overview will help you identify weak points in your processes and understand the value of preventive legal care.

When Business Knows No Borders: Specifics of Amendments in International Contracts

If you trade with foreign partners, another layer of complexity comes into play. A procedure that is seamless in the Czech Republic may be invalid in Germany, Poland, or another country. Ignoring the international context is one of the most common and costly mistakes Czech companies make.

"Battle of Forms": When Two Sets of Terms and Conditions Clash

In international trade, it is common for both parties (buyer and seller) to refer to their own terms and conditions. What happens when these terms contradict each other? Different legal systems view this situation, known as the "battle of forms," differently.

• The Czech approach ("Knock-out Rule"): According to the Czech Civil Code (Section 1751(2)), the contract is concluded nonetheless. The provisions of the GTCs that contradict each other are "knocked out," and the general statutory regulation is used instead. Thus, the part of the terms on which they agree remains valid.

• Other international approaches (e.g., "Last Shot Rule"): Many other legal systems, especially in the Anglo-Saxon world, apply the "last shot rule." According to this doctrine, the contractual relationship is governed by the terms and conditions that were sent to the other party last and to which no objections were raised. This can lead to very surprising and unfavorable conclusions if you are not aware of this difference.

Governing Law: Which Rules Govern Your Contract?

To avoid chaos, it is absolutely crucial to include a choice of law clause in a contract with an international element. With this clause, you and your partner determine which state's legal system will govern your relationship.

If this clause is missing, complex rules of private international law come into play. Within the EU, this primarily involves the Rome I Regulation, which sets criteria for determining the applicable law (e.g., the law of the seller's country of residence for a sales contract). For the international sale of goods, the Vienna Convention on Contracts for the International Sale of Goods (CISG) may also come into play, which contains its own unified regulation.

The Power of an International Network: How ARROWS International Solves Global Challenges

Navigating these complex rules requires not only a deep knowledge of Czech law but also an international reach. This is where the strength of our firm becomes apparent. Thanks to the ARROWS International network, built over ten years and bringing together proven law firms in more than 70 countries worldwide, we deal with issues with an international element on a daily basis. We are able to ensure that your changes to terms and conditions are not only valid under Czech law but also enforceable in the jurisdiction of your foreign partner.

International Trade: How to Avoid Pitfalls When Changing Terms

International trade brings specific risks that can thwart even a well-intentioned change to GTCs. The following table shows how the ARROWS International network helps you safely manage these global challenges.

Hidden Pitfalls and Costly Mistakes: What Can Invalidate Your Changes?

Even if you follow the formal procedure, there are other pitfalls that can lead to the invalidity or ineffectiveness of your new terms and conditions. These are often mistakes that companies make out of ignorance or in the belief that looser rules apply in business-to-business (B2B) relationships than with consumers.

More Than Just Content: Surprising Clauses

The Civil Code protects the other contracting party from so-called surprising clauses. These are clauses that an average businessperson in a given situation would not reasonably expect. Such a provision is ineffective unless the other party has expressly accepted it.

What can be considered a surprising clause in a B2B context?

• The introduction of a new, high flat-rate fee for a service that was originally offered and communicated as free or with payment only per transaction.

• A hidden arbitration clause that deprives the partner of the opportunity to turn to a general court.

• An unreasonably high contractual penalty that is grossly disproportionate to the value of the contract and the nature of the breached obligation.

• A fundamental and unusual limitation of your liability for defects or damage.

Moreover, the surprising nature is not judged only by the content, but also by the form. A provision written in extremely small print, placed in an illogical part of the document (e.g., a contractual penalty in the personal data protection section), or otherwise graphically "hidden" can also be considered surprising and ineffective.

Tacit Consent (Implied Consent): When Does It Apply and When Does It Not?

Many companies rely on the assumption that if a partner does not respond to a notification of a change, they automatically agree to it. However, this passive (implied) consent is valid only if this mechanism was expressly agreed upon in the original contract.

If the contract is silent on the possibility of tacit consent, or if it requires a written form (amendment) for changes, then your partner's silence in no way means consent. In such a case, the change is ineffective, and you cannot invoke it.

Legal risks and customer experience are two sides of the same coin in this regard. A change that is confusing for the customer, poorly communicated, or seems unfair is highly likely to be legally challengeable as well. This means that your legal department and customer care department must work closely together when planning changes. Transparent and proactive communication is not just good customer service; it is a legal necessity.

The lawyers at ARROWS conduct a comprehensive legal audit of your GTCs and contractual processes. We identify and remove risky "surprising clauses" and help you set up a change communication process that is not only legally sound but also protects your customer relationships.

ARROWS: Your Strategic Partner for Secure Growth and a Flexible Business

Changing terms and conditions is not just an administrative act. It is a strategic decision that carries significant legal and business risks. As this article has shown, the difference between successful adaptation to new conditions and a costly failure lies in expert preparation, precise execution, and a deep understanding not only of legal paragraphs but also of business reality.

The role of a modern law firm has shifted from reactive problem-solving to proactive risk management. At ARROWS, we understand that our task is to provide you with comprehensive solutions that protect your company and support its growth.

Our help does not begin only when you want to change terms, but much earlier:

• It all starts with the careful preparation or review of your original contracts to build in the necessary flexibility.

• We will draft clear internal guidelines for your team so that every employee knows how to correctly and safely proceed with managing and changing contracts.

• We will prepare all the documentation that will protect you from fines and penalties from regulatory authorities.

• We will provide you with legal consultations that will give you certainty before every strategic step.

• For key decisions, we will deliver clear legal opinions that will help you weigh all options and risks.

• And if a dispute should arise, we will effectively represent you before courts and administrative bodies in the Czech Republic and abroad.

Prevention is the best protection. That is why we provide expert training, including certification, for you and your employees, because a well-informed team is your first line of defense against unnecessary mistakes.

Our experience from long-term care of a portfolio of more than 150 joint-stock companies, 250 limited liability companies, and 51 municipalities and regions gives us a unique insight into the real needs and challenges of Czech companies. We pride ourselves on speed, high quality, and a business-oriented approach to law.

Beyond Paragraphs: ARROWS as a Business Accelerator

We understand that law and business are interconnected. Our goal is not only to protect you from risks but also to actively contribute to your success. That is why we do more for our clients. We actively connect our clients with each other when we see interesting investment or business opportunities. We are also happy to listen to your business ideas. The choice of a law firm today is not just about technical knowledge of the law; it is the choice of a partner who has the network, business insight, and proactive approach to help your company prosper.

Do you feel that your existing contracts are not flexible enough? Are you planning a change in your price list or services and are unsure of the correct procedure? Do not wait for a small problem to become a costly mistake.

Contact our team at ARROWS. We will discuss your situation and propose a strategy that will protect your business and allow it to grow safely. Your contracts should be your advantage, not a risk.