yes.

it is illegal not to invoice.

according to the law, after purchasing goods, consumers have the right to ask for invoices from merchants, and merchants are also obliged to issue invoices.

invoices refer to business vouchers issued and collected by all units and individuals in the purchase and sale of commodities, provision or acceptance of services and other business activities, which are the original basis for accounting and the important basis for law enforcement inspection by audit institutions and tax authorities.

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.

the contents of the invoice generally include: ticket header, track number, serial number and purpose, customer name, bank account number, commodity name or business item, unit of measurement, quantity, unit price, amount, amount in words and figures, handler, unit seal, invoice date, etc. The special invoices for value-added tax used by units that implement value-added tax should also include tax types, tax rates, tax amounts, etc.

when selling goods, providing services and engaging in other business activities, you should issue invoices to the payer. Under special circumstances, the payer will issue an invoice to the payee. Invoices shall be issued truthfully at one time in accordance with the prescribed time limit, sequence, column by column and all times, and stamped with the special seal for unit invoices. All units and individuals engaged in production and business operations shall obtain invoices from the payee when purchasing goods, receiving services, and paying for other business activities, and shall not ask for changes in the name and amount.

article 22 of the law of the people's Republic of China on the protection of consumers' rights and interests, when providing commodities or services, business operators shall issue invoices and other purchase vouchers or service documents to consumers in accordance with relevant state regulations or commercial practices; When consumers ask for purchase vouchers or service documents such as invoices, business operators must issue them.