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 an important basis for law enforcement inspection by audit institutions and tax authorities. The receipt is the proof of receipt and payment, and the invoice can only prove that the business has happened, but can't prove whether the money has been received or paid.

Invoice refers to the text issued by the seller to the buyer in economic activities, including the name, quality and agreed price of the products or services provided to the buyer. In addition to the advance payment, the invoice must include the payment from the buyer to the seller according to the agreed conditions, and must include the date and quantity, which is an important proof of accounting. China's accounting system stipulates that valid invoices for purchasing products or services are called tax invoices. The vouchers of government departments' fees and levies have different names in different periods and different fees and levies, but most of them are collectively referred to as administrative fees and receipts. For internal audit and verification, each invoice must have a unique journal number to prevent the invoice from repeating or skipping.

An invoice is the original proof of the cost, expense or income incurred. For the company, the invoice is mainly the basis for the company to make accounts, and it is also the proof of tax payment, while for employees, the invoice is mainly used for reimbursement.

Invoices that do not meet the requirements shall not be used as financial reimbursement vouchers, and any unit or individual has the right to reject them.

Article 16 of the Measures for the Administration of Invoices of the People's Republic of China can directly apply to the tax authorities in the place of business for invoicing on the basis of written certificates of buying and selling commodities, providing or receiving services and engaging in other business activities and the identity certificate of the agent. If taxes should be paid in accordance with the provisions of tax laws and administrative regulations, the tax authorities should collect taxes first and then issue invoices. According to the needs of invoice management, the tax authorities may entrust other units to issue invoices in accordance with the provisions of the competent tax authorities in the State Council.