Loans to buy second-hand houses are generally unable to provide full invoices. If a house is bought by loan, the purchase price shall be paid by bank loan, and the transaction between the buyer and the seller shall be confirmed by the house sales contract and the bank loan contract. Invoices are generally used to confirm the payment of the purchase price, but in the loan purchase, the actual payment is the bank loan, not the buyer's own funds. Therefore, it is generally impossible to provide a full invoice for buying a house with a loan.