After buying a house with a loan, you will be given a full invoice after handling the real estate license. Property buyers can issue formal property invoices when the mortgage loan is completed or paid in full. Developers sell auction houses. After the house is completed, it is necessary to measure the area, refund the price and taxes according to the difference between the measured area and the sales area, and finally apply for the real estate license according to the measured area. Developers will wait until the real estate license is completed and provide it to buyers together with invoices. Different developer companies have their own financial accounting methods. Some developers issue invoices after receiving the house payment, and then after the actual measurement, if the area is wrong, they can issue supplementary or red-letter invoices and so on.