Just issue a normal invoice. The function of invoice: Invoice refers to the written proof of the receipt and payment provided by all units and individuals to each other in buying and selling goods, providing labor services or accepting labor services and engaging in other business activities. It is the legal certificate of financial revenue and expenditure, the original basis of accounting, and an important basis for law enforcement inspection by audit institutions and tax authorities. It is divided into: ordinary invoices and special invoices for value-added tax.

Article 1 of the Measures for the Administration of Invoices of the People's Republic of China: In order to strengthen invoice management and financial supervision, safeguard national tax revenue and maintain economic order, these Measures are formulated in accordance with the Law of the People's Republic of China on the Administration of Tax Collection.

The contents of the invoice include the name, date, quantity and agreed price of the product or service provided to the buyer. Each invoice has a unique journal number to prevent the invoice from repeating or skipping. Invoice plays an extremely important role in social and economic activities in China.

1. Invoice has the characteristics of legality, authenticity, unity and timeliness, and is one of the most basic accounting original vouchers;

2. Invoice is the carrier of recording economic activities and an important tool of financial management;

3. Invoice is an important basis for tax authorities to control tax sources and collect taxes;

The authorities that have the right to collect taxes and fees are the departments of finance, national tax, local tax, customs and related industries, and the competent departments of finance and related industries all use special administrative receipts. National tax and local tax are under the unified management of State Taxation Administration of The People's Republic of China, and the customs is under the vertical management of the General Administration of Customs. State and local taxes are responsible for the collection of industrial and commercial taxes, which basically include all kinds of taxes levied on enterprises and individual residents engaged in industrial and commercial operations. Most taxes in China belong to industrial and commercial taxes. Customs is responsible for the collection of tariffs, including import and export tariffs and ship tariffs.

There are many kinds of invoices, mainly classified according to the characteristics of the industry and the taxpayer's production and operation projects, and each invoice has a specific scope of use.

Invoice is an important means for the state to supervise economic activities, maintain economic order and protect national property security.