A contract signed after the event is valid as long as it meets the conditions for the contract to take effect and is established according to law. If the contractual obligations have been fulfilled before the contract is established, both parties reach an agreement on this behavior and sign a contract, which is legally binding on both parties. The countersigning of the contract only indicates that the contract has been established in written form, and does not mark the establishment of the contract. Therefore, countersigning does not affect the effectiveness of the contract itself, nor does it have a negative impact on the main body of the contract (the contract risk lies in the terms of the contract itself, the retention of relevant evidence during the performance of the contract and the integrity of the other party, not in the way of countersigning the contract).
Supplementary contract signing means that both parties sign a written contract only during or after the performance of specific business, and the signing date indicated in the contract is the actual signing date of the contract. At this time, the contract business started earlier than the contract signing time. At this time, there are two different time points: the actual contract business start time and the contract signing time. The countersigning of a contract means that both parties sign the contract only during or after the performance of a specific business, and the signing date indicated in the contract is earlier than the actual signing date of the contract. At this time, there are three different time points, namely, the start time of the contract business, the signing time indicated in the contract and the actual signing time of the contract, but they are still two time points in form (the start time of the contract business and the signing time indicated in the contract cannot be reflected from the contract text itself).
I hope the above content can help you. If in doubt, please consult a professional lawyer.
Legal basis:
People's Republic of China (PRC) Civil Code
Article 143 A civil juristic act that meets the following conditions is valid:
(1) The actor has corresponding capacity for civil conduct;
(2) the meaning is true;
(three) does not violate the mandatory provisions of laws and administrative regulations, and does not violate public order and good customs.
Article 465
Contracts established according to law are protected by law.
A legally established contract is legally binding only on the parties, except as otherwise provided by law.
Article 490
If the parties enter into a contract in the form of a contract, the contract shall be established when the parties sign, seal or press their fingerprints. Before signing, sealing or fingerprinting, one party has fulfilled its main obligations, and the contract is established when the other party accepts it.
A contract shall be concluded in written form as stipulated by laws, administrative regulations or agreed by the parties. If the parties do not do this in writing, but one party has fulfilled its main obligations and the other party accepts it, the contract is established.