Legal analysis: the signature of input invoice deduction has not been confirmed, that is, the information has not been transmitted to the tax bureau. Invoice refers to the business vouchers issued and collected by all units and individuals in buying and selling goods, providing or receiving services and engaging in other business activities. It is the original basis of accounting, and it is also an important basis for law enforcement inspection by audit institutions and tax authorities. Receipt is the proof of receipt and payment, and invoice can only prove that the business has happened, but can't prove whether the money has been received or paid.

Legal basis: Measures for the Administration of Invoices in People's Republic of China (PRC).

Nineteenth units and individuals that sell goods, provide services and engage in other business activities receive money from foreign operations, and the payee shall issue an invoice to the payer; Under special circumstances, the payer will issue an invoice to the payee.

Article 20 All units and individuals engaged in production and business activities shall ask the payee for invoices when they pay for goods, services and other business activities. When obtaining the invoice, you are not allowed to change the name and amount.