It didn't work. According to the relevant provisions of the national tax law, in the process of product sales, the sales unit should issue a special VAT invoice to the purchasing unit. Whether the buyer needs a special VAT invoice or not, the sales unit must pay taxes according to the national tax law, so it doesn't matter if you buy fitness equipment without an invoice. 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.