It is fraudulent for one party to sign a contract with the other party under a false name, and the other party may apply to the court for cancellation of the contract; If the circumstances are serious, it is suspected of constituting the crime of contract fraud.

Is the ID number of signing the contract incorrect and valid?

Incorrect ID number does not affect the validity of the contract. According to the provisions of the Civil Code of People's Republic of China (PRC), if the parties conclude a contract in the form of a contract, the contract is established when both parties sign or seal it. As long as the signature or seal is true, the contract is valid.

Sign a contract under a pseudonym. Is the contract still valid?

1. If the signed pseudonym does not match the household registration, but the signed words belong to other names used to express the meaning of the actor in daily life, if the signing behavior is the expression of the actor's true meaning and does not make the other party violate his true meaning, then the signed contract should be a valid contract agreed by both parties.

It is fraudulent to sign a contract without using your real name. If one party uses fraudulent means to make the other party sign a contract against its true meaning, the injured party has the right to request the people's court or arbitration institution to modify or cancel the signed contract.

3. If the actor signs under a pseudonym under the premise that he may infringe on the interests, so that the other party signs a contract against his true meaning without knowing it, in this case, the effectiveness of the actor's signature behavior is to be determined, and the signed contract can be revoked or changed.

To sum up, when concluding a contract, the identity information used must be true and effective. It is illegal to sign a contract under a false name.

Legal basis:

Criminal law of the people's Republic of China

Article 224

Under any of the following circumstances, if the amount involved is relatively large in the process of signing and performing a contract for the purpose of illegal possession, he shall be sentenced to fixed-term imprisonment of not more than three years or criminal detention and shall also or only be fined; If the amount is huge or there are other serious circumstances, he shall be sentenced to fixed-term imprisonment of not less than three years but not more than ten years and shall also be fined; If the amount is especially huge or there are other especially serious circumstances, he shall be sentenced to fixed-term imprisonment of not less than 10 years or life imprisonment, and shall also be fined or confiscated:

1. Sign a contract in the name of a fictitious unit or others;

2, forged, altered, invalid bills or other false proof of property rights as a guarantee;

3. Without actual performance ability, first perform the small contract or part of the contract to trick the other party into continuing to sign and perform the contract;

4. Escape after receiving goods, money, advance payment or secured property from the other party;

5. defrauding the other party's property by other means.