Group 1 - The article discusses the tax deduction policies for enterprises that are unable to obtain invoices or external vouchers due to specific circumstances such as business license cancellation or being classified as non-compliant [5][7]. - It outlines the necessary documentation required for tax deductions, including proof of the inability to obtain invoices, contracts, payment vouchers, and internal accounting records [6][7]. - Enterprises can retroactively claim tax deductions for expenses incurred in previous years if they obtain the required documentation within five years [7]. Group 2 - The article explains the tax rate for high-tech enterprises whose qualification is expiring and are in the process of re-certification, stating that they should prepay corporate income tax at a rate of 15% [14][20]. - If the high-tech qualification is not obtained by the end of the year, the enterprise must make up the difference in tax payments as per regulations [17][20].