Legal analysis: Double sales contract means that the two parties write two different contracts in order to avoid government taxes. One is internal and the other is external. It is a fake contract. The one written to evade taxes, and the internal one represents the true wishes of the buyer and seller. The existence of the extra-contract is mainly to hand over the inflated house price contract to the bank to apply for more mortgage loans, or to fill in the Submit it to the real estate transaction center for transfer at a low price in order to pay less tax.

Legal basis: Article 596 of the "People's Republic of China and Civil Code" The content of a sales contract generally includes the name, quantity, quality, price, time limit for performance, place of performance and the name of the subject matter. Method, packaging method, inspection standards and methods, settlement method, words used in the contract and its validity and other terms.