[Direct answer]In the Beijing area, a contract in the form of a contractual document is deemed to be established when all parties have signed, stamped, or affixed their fingerprints. Signing, stamping, and fingerprinting are three parallel requirements for the contract's establishment, and any one of them suffices. If the legal representative signs on behalf of the company without stamping, the contract is still valid and effective for the company. The concept of "only recognizing the stamp and not the signature" is inconsistent with the law, unless the contract explicitly stipulates that "it shall take effect only after both parties have signed and stamped it," or the transaction falls under circumstances requiring legal approval to take effect. The real point of contention often lies not in whether the contract is established, but in whether the signatory has the authority to represent the company and whether the other party acted in good faith.

1. Problem background and typical scenarios

The legal representative of the company signed the contract personally, but the official seal was not stamped. Six months after the contract was executed, the company suddenly claimed that "the unsigned contract is invalid". Or, the department manager signed the contract under a false name, and the company shifted the blame by saying "it wasn't signed by the legal representative". The debate over the legal effect of signatures and official seals is an enduring point of contention in business transactions.

II. Key points of contention

First, the parallel relationship between signing, stamping, and fingerprinting. Second, the effectiveness of representative authority and over-authority representation. Third, the interpretation of the agreement on "signing and stamping". Fourth, subsequent ratification and actual performance.

III. Professional analysis by Henglue Lawyers

The first layer is the explicit logic of the rules: When the parties enter into a contract in the form of a contract document, the contract is concluded when all parties sign, stamp, or affix fingerprints on it—the legal provisions use "or" to connect the three methods, and any of them suffices for the contract to be established. Signatures and stamps have the same legal effect. If the legal representative signs the contract on behalf of the company, the representative's act is binding on the company, and the signature itself constitutes the conclusion of the contract. If the company defends against the contract's non-existence by arguing that it "was not stamped," the court will not support this. This rule also corrects the "worship of the official seal" phenomenon—the seal is just a formality, and the signatory's identity and authority are the core of the contract. The second layer focuses on authority: If the legal representative exceeds his authority when signing the contract, unless the counterparty knew or should have known about the exceeded authority, the representative's act is valid—in normal commercial transactions, the counterparty has no obligation to verify internal authorization, and bona fide counterparties are protected. A more obvious example of overstepping authority is ordinary employees signing documents without authorization: their signatures do not automatically bind the company. If the company does not retroactively approve the contract, it is not binding on the company, and the counterparty can only claim contractual breach or review the apparent agency—if the apparent agency is established (reasonable belief in authority: position, historical transactions, official seal documents, etc.), the contract is still binding on the company. Therefore, verifying the signatory's identity and authority is closer to the essence of risk than simply checking whether the "seal was stamped." The third layer is the exception to the "signature and stamp" clause: If the contract explicitly stipulates that "this contract shall take effect after both parties sign and stamp it," the provisions shall be followed—the contract stipulates that both signatures and stamps are essential for effectiveness, and the absence of either renders the contract ineffective. However, ineffectiveness does not mean a deadlock—if one party has performed its main obligations and the other party accepts them, the contract is established and effective through actual performance (the cure rule). Evidence such as delivery, receipt, and payment records is sufficient to invalidate the "no stamp" defense. When signing contracts, it is essential to carefully review the wording of the effectiveness clauses: "signature and stamp," "signature or stamp," and "signature and stamp" have completely different legal effects. The fourth layer is a practical checklist for risk control and evidence collection: Verify the signatory's identity (legal representative's identity certificate, business license) and authorization documents during contract signing; insist on the "legal representative's signature plus official seal" double insurance for important contracts to avoid contractual ambiguity; add staple signatures to multiple contract pages to prevent page replacement; retain full chains of evidence for payment, invoices, acceptance, and correspondence during performance—the evidence chain of actual performance not only ends the "non-existence" defense but also reconstructs the factual state of future disputes; and separately photograph and archive the signature page to freeze the signing scene as evidence.

IV. Practical suggestions and legal basis

The first step is to verify the identity and authorization of the signatories before signing the contract; the second step is to set clear effective clauses in important contracts and require dual-factor signing; the third step is to affix a running stitch seal on multi-page contracts; and the fourth step is to keep track of the entire performance process and use actual performance evidence chains as a backup. The main legal basis: Articles 490, 502, and 504 of the Civil Code of the People's Republic of China, and relevant provisions of the Interpretation of the Supreme People's Court on Several Issues Concerning the Application of the General Provisions of the Contract Chapter of the Civil Code; the specific application shall be subject to the currently effective provisions.

5. Henglu Law Firm's Reminder

Three key points regarding signatures and stamps: any of the following is sufficient for the agreement to take effect - signature, stamp, or fingerprint; the real disputes lie in authority and good faith, with apparent agency safeguarding superficial trust; it's crucial to carefully review the terms of the agreement signed and stamped, as the chain of evidence of actual performance serves as the ultimate proof. This case was handled by Beijing Henglu Law Firm.Xue SuhuaThe attorney (practice license number: 11101201211769926, subject to the document issued by the judicial administrative organ) acts as an agent. For disputes regarding the establishment and validity of contracts, you can refer to the following channels for resolution:Business and contract disputes in enterprisesThe service obtains an overall solution, which involves the integration of enterprise systems and the construction of an authorization system.Intellectual property protection and corporate lawFor reference, you can refer to the section on debt collection and enforcement of payment ordersCreditor's rights and debts, and enforcementFor any questions regarding difficult situations, you can consult the column for assistanceSpecial servicesTeam.

VI. Frequently Asked Questions

Q1: If the legal representative's signature is not stamped, can the company claim that the contract is invalid?

No. Either a signature, a stamp, or a fingerprint is sufficient to establish the document. The legal representative's signature represents the company's authority, and the document is valid even without a stamp.

Q2: If the manager signs but doesn't stamp the document, does it still count as a company document?

The signature of an ordinary employee does not necessarily take effect for the company; contracts that constitute apparent agency (based on the employee's position and the appearance of historical transactions) still take effect for the company. Otherwise, the contract will not be recognized by the company and will not be deemed valid.

Q3: What should I do if I forgot to stamp the agreement after signing it and making it effective?

The contract does not take effect as agreed; however, if one party has performed its main obligations and the other party has accepted them, the contract shall be deemed to have been established and taken effect through actual performance.

Q4: Is it safe to only stamp the signed page of a multi-page contract?

It is recommended to affix a running stitch seal and initial each page to prevent disputes over page replacement. Take photos of the signed pages and archive them to capture the signing scene.

Q5: What should I do if there are doubts about the authenticity of the official seal?

Applicants request a forensic examination to compare the signature on the document with the actual signature, and at the same time, verify the identity of the signatory and the actual performance of the contractual obligations—the signatory's authority and actual performance often hold greater significance than the signature on the document itself.

This article is written based on the common judicial interpretation in the Beijing area. If the case occurs in other regions, it is recommended to consult local lawyers to verify the regional differences.

If you are currently facing similar problems, it is recommended that you consult a professional lawyer as soon as possible with the relevant evidence materials, to avoid missing the statutory time limits. →Corporate commercial legal services·Beijing Henglue Law Firm

Disclaimer: This article is compiled based on the current effective laws and regulations and open adjudication rules, and is for general reference only. It does not constitute a formal legal opinion on specific cases. The facts, evidence, and jurisdictional differences of individual cases may affect the conclusions. If you encounter disputes, please consult a practicing lawyer in time.