[Direct answer]Generally, you don't need to repay the loan. If the promissory note was not signed by you personally, and you did not subsequently acknowledge it (did not repay the loan or admit the debt), the loan transaction will not be binding on you—unauthorized agency without subsequent acknowledgment, and the actual signatory will bear responsibility. However, you need to beware of the exception of "apparent agency": if the lender reasonably believes that the signatory has the authority to act on your behalf (holding your stamp, ID card, or having a transactional history with you), you may also be implicated. If you are actually sued, handwriting authentication and evidence of subsequent non-acknowledgment will serve as two protective measures.

I. Problem Background and Typical Scenarios

The father signed on behalf of his son, the brother covered for his brother, and the business partner filled in the "joint borrower" column with the partner's name—the people whose signatures were forged often only realized they "owed money" when they received court summonses. The legal responsibility for forged promissory notes is not complicated: whether the signature is valid for the person whose signature was forged depends on the power of attorney and the subsequent recognition of the act.

II. Key points of contention

First, the rules governing the validity of signature delegation. Second, the determination of subsequent ratification and ex post facto acts. Third, the exceptional risks of apparent agency. Fourth, the operation of handwriting identification and defenses.

III. Professional analysis by Henglue Lawyers

The first layer, rules on agency: Article 171 of the Civil Code of the People's Republic of China stipulates that if the agent lacks agency authority, exceeds the scope of agency, or terminates the agency relationship after the fact, but still performs agency acts, the acts will not be binding on the principal unless the principal subsequently ratifies them—if someone else signs the IOU on your behalf without your authorization, the loan contract will only be binding (or invalid) between the "signatory" and the lender, and the repayment responsibility will be borne by the actual signatory. The open cases in this section provide direct evidence: First, after the father borrowed money, he signed the IOU on behalf of the borrower without the son's knowledge and affixed his thumbprint at the borrower's signature section at the lender's request. The court ruled that the signature was not the borrower's own and was not subsequently ratified, so the son did not bear repayment responsibility and the liability fell on the father. Second, another court ruled that the borrower was not liable for the IOU signed by someone else after it was identified as a forgery through forensic examination—both judgments follow the same approach: non-own signature + non-ratification = no liability. The second layer, ratification and subsequent actions: Ratification can be explicit (written confirmation, promise to repay) or inferred from subsequent actions—repaying the loan on behalf of the borrower, confirming accounts, accepting collection notices without denial and promising to fulfill obligations may all be deemed ratification. The borrower should avoid "well-intentioned troubles"—helping repay several installments out of family affection, replying to collection messages with "give us a few more days" may all serve as evidence of ratification in litigation. Cutting off the presumption of ratification requires immediately issuing a written statement (sending a letter to the lender explicitly denying the debt) upon discovering the forgery. The third layer, exceptions to apparent agency: Article 172 of the Civil Code stipulates that if the counterparty reasonably believes the agent has agency authority, the agency act is valid—if the lender reasonably and without negligence believes the signatory has the authority to represent you (the signatory holds your original ID card, private stamp, has signed for previous loans on your behalf, or you are a married couple or business partners), the IOU may be binding on you. Defense points: The lender's "good faith" must be reviewed—if the lender closely associates with the signatory, knows you are unaware of the forgery, or accepts the signature despite obvious handwriting inconsistencies, it's hard to claim good faith. The distinction between the "joint borrower" and "guarantor" columns also affects liability nature. The fourth layer, forensic examination and defense strategies: Handwriting examination is a key weapon—apply for a judicial handwriting examination of the IOU signature, using the borrower's contemporaneous genuine signature as the sample. Prepaying the examination fee and adhering to unfavorable burden rules prompt lenders to exercise caution. At the same time, collect evidence of "non-ratification": bank transaction records showing no repayment, chat records showing no involvement in loan communication, and letters of repudiation after discovering the forgery. For lenders claiming cash delivery, review the delivery process (reasonableness of large-scale cash delivery without proof). The fifth layer, self-rescue and prevention: Discovering forgery—report to the police first (forged documents or fraud), then prepare for handwriting examination and issue a written statement of denial. At the preventive level—never lend ID documents, strictly manage stamps, and sign loan documents in person and retain copies on the spot. For lenders, the risk of liability falls on them if they accept the IOU without on-site verification of the signature—our firm often advises clients: once the borrower's signature is fraudulently used, the lender's creditor's rights are the first to suffer, and standardized signing is a two-way protection.

IV. Practical suggestions and legal basis

The first step is to determine the nature of the situation: confirm that the signature is not the borrower's own and that the borrower has not subsequently acknowledged it, thereby identifying the unauthorized agent. The second step is to conduct an appraisal: use the borrower's contemporaneous genuine signature as a sample for handwriting analysis. The third step is to deny subsequent acknowledgement: stop any commitment to repay on behalf of the borrower and issue a written statement denying such obligations. The fourth step is to prevent exceptions: review whether the lender acted in good faith and rule out apparent agency. The main legal basis is Articles 171, 172, and 490 of the Civil Code of the People's Republic of China; the specific application shall be subject to the currently effective provisions.

5. Henglu Law Firm's Advice

Three sentences on signing loan notes on behalf of others: If it's not signed by you and you haven't subsequently acknowledged it, the debt will not be binding on you, and the responsibility will lie with the actual signatory; Helping to repay a loan once may be regarded as subsequent acknowledgement. If you find that the loan note has been signed on your behalf, you should first make a statement and then deal with it; The apparent agency of signing on behalf of others with certificates is an exceptional risk, and the certificates and stamps should not be lent out. For disputes involving loans and signing on behalf of others, you can seek help through legal channels.Creditor's rights and debts, and enforcementThe service provides a comprehensive solution, which involves handwriting authentication and the integration of evidence.Special servicesFor platelets, those involved in domestic debt disputes can refer to it for reference.Divorce litigation and family disputesThe column provides advice on debts arising from commercial transactionsBusiness and contract disputes in enterprisesTeam.

VI. Frequently Asked Questions

Q1: Do I need to repay the IOU that my father signed for me?

It's generally not used. If the signature is not yours and you haven't acknowledged it, the agency is not valid and the repayment responsibility shall be borne by the father who actually signed the contract; however, it's an exception if the lender has reason to believe that you authorized it.

Q2: Can I still raise an objection if I've already helped repay a loan installment?

The difficulty has increased—some repayments may be deemed as an acknowledgment of the debt; immediately stop making repayments on behalf of others, issue a written statement of denial, and there is still room for defense, but this requires supporting evidence.

Q3: Who will bear the cost of handwriting authentication?

The applicant shall pay the advance fee, and the party whose appraisal result is unfavorable shall bear the final responsibility; if the person authorized to sign on behalf of the applicant confirms that the signature is not his/her own after the appraisal, the lender or the person authorized to sign on behalf of the applicant shall bear the expenses.

Q4: What should the lender do if the borrower says they want to pay in cash?

For large cash payments, it is necessary to review the reasonableness and details of the payment (time, location, and source of funds). Combined with the defense that you have not received or used the money, and the conclusion of the appraisal, the responsibility attribution can be comprehensively determined.

Q5: What should you do if you discover that someone else has signed on your behalf without your authorization?

Call the police to file a report, send a written statement to the lender denying the debt, keep evidence of not participating in the loan, and consult a lawyer to prepare for appraisal and defense strategies.

The above Q&A is mainly based on the judicial practice in the Beijing area. There may be differences in the adjudication guidelines in different regions. It is recommended to consult a professional lawyer based on the specific circumstances of the case.

VII. Relevant public cases (for reference, not handled by our firm)

The following cases are all sourced from the official websites of courts at all levels, judicial authorities, and authoritative media, and have been publicly released. They are unrelated to the cases handled by our firm. They are provided solely for reference in understanding relevant adjudication rules and do not constitute opinions on specific cases.

[Case Number]The case number has not been made public.
[Trial Court]The People's Court of Xingan County, Jiangxi Province
[Judicial Summary]After borrowing money, the father, at the request of the lender, signed the name of his unaware son and affixed his fingerprint in the borrower's section of the IOU. The court held that the signature was not signed by the borrower himself, and he did not acknowledge it afterwards. Therefore, it should be determined that the borrower did not have the intention to borrow the money, and no lending relationship was formed between the lender and the borrower. The court ruled to dismiss the lender's lawsuit against the son. Key points: Forging someone else's signature is an infringement, and in serious cases, it may involve criminal liability.
[Source]The China Court Network reported that "A father used his son's signature to borrow money from others, but the court ruled that the son did not need to bear legal responsibility" (2018-09).

[Case Number]The case number has not been made public.
[Trial Court]The People's Court of Ganzhou Economic and Technological Development Zone
[Judicial Summary]The lender claimed that the borrower owed 50,000 yuan based on the promissory note. After forensic appraisal, it was found that the borrower's signature and fingerprint on the promissory note were not made by the borrower himself, and the guarantor's signature was not written by the guarantor himself. The court held that the promissory note had major flaws and its authenticity was not recognized, so the court ruled to dismiss all the lender's claims. Key points: The lender should make sure that the borrower signs and stamps the promissory note himself and leaves his mark on it, and should never accept a substitute signature.
[Source]The Jiangxi Court Network article titled "Be Careful When Borrowing Money and Write the Loan Note Clearly" (2023-03)

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 limit. →\nLegal services for creditor-debtor disputes·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. In case of disputes, please consult a practicing lawyer in time.