Determine the applicable tax rate, subtract the deductible cost from the pre-tax sales, and get the taxable amount. Differential taxation is a way to calculate tax according to actual sales and fixed tax rate. The invoice will show the sales amount, tax rate and tax payable. Information to be included in the invoice, such as enterprise name, taxpayer identification number, transaction amount, tax rate, tax payable, etc. Invoice plays an important role in tax declaration and tax accounting, so it is very important to ensure the accuracy of invoice information.