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Core Viewpoint - The article discusses the essential documentation and materials that companies must retain to benefit from the R&D expense super deduction policy, emphasizing the importance of proper record-keeping for tax benefits [9][10][11][12][18][19][20]. Group 1: Basic Documentation for R&D Expense Deduction - Companies must retain two core types of documentation to prove the nature of R&D projects: project plans for self-initiated, commissioned, or collaborative research and the resolution documents from the company's authorized departments regarding project approval [9]. - For R&D activities, documentation related to personnel and assets is crucial, including the organizational structure of the R&D team, a list of R&D personnel, and detailed expense allocation records for personnel and equipment used in R&D [10]. Group 2: Documentation for Centralized R&D Projects - Companies engaged in centralized R&D projects need to maintain a detailed R&D expense settlement report, a breakdown of shared expenses, and documentation of actual profit-sharing ratios [11]. Group 3: Auxiliary Accounting Records - It is necessary to keep an auxiliary ledger for R&D expenses along with a summary table to track and report R&D expenditures accurately [13]. Group 4: Additional Documentation for Commissioned R&D - For commissioned R&D (including overseas), companies must retain additional documents such as registered contracts with domestic R&D entities, payment vouchers, receipts from the recipient, and progress reports of the project [18]. Group 5: Retention Period for Documentation - Companies must keep the R&D expense deduction documentation for a minimum of 10 years, starting from the day after the corporate income tax settlement period ends for the year in which the benefits were claimed [19][20]. Group 6: Policy Reference - The article references the announcement from the National Taxation Administration and the Ministry of Finance regarding the optimization of prepayment declarations for R&D expense super deductions [22].