1. There is an invoice for the down payment when buying a house, and the invoice for the down payment will be given after the down payment is paid.

2. After the property buyers have signed the purchase contract with the developer and paid the down payment, the developer should issue the down payment invoice to the property buyers.

3. After the property buyers handle the loan, the bank lends money and the money is credited to the developer's account, the developer should issue a full invoice to the property buyers.

4. You need to provide the purchase invoice when you purchase a house, withdraw the housing accumulation fund, handle the real estate license and settle down.