1. Second-hand housing transactions between individuals: Sometimes, second-hand housing transactions are conducted between individuals and do not involve issuing formal purchase invoices. In this case, the two parties may have just signed a sales contract, conducted capital transactions and transfer procedures, but did not issue a purchase invoice.
2. The taxes involved have been paid: buying a second-hand house generally involves various taxes, such as deed tax and value-added tax. If the seller has paid the relevant taxes and fees according to the regulations, then the purchase invoice may not be issued because it involves tax payment. You can check with the seller whether the relevant taxes have been paid.
3. Illegal transaction or other improper behavior: In some cases, there may be illegal transaction or other improper behavior, resulting in no purchase invoice. This may require you to contact relevant departments or legal institutions to consult and solve related problems.
When buying a second-hand house, it is very important to keep all relevant information and certificates. This includes sales contracts, payment vouchers, transfer procedures, etc.