What does it mean to be tax-free in coupon rate in general?

The meaning of tax exemption for ordinary invoices: it means exemption from value-added tax.

State Taxation Administration of The People's Republic of China announced that from April 1 day to February 3 1 day, 2022, small-scale taxpayers will be exempted from the preferential policy of value-added tax for issuing 3% ordinary invoices. Value-added tax is tax-free, and enterprise income tax is inevitable. If you tell your customers that 3 points or 1 points are value-added tax, personally, it is not appropriate, because national policies are exempt from value-added tax.