What does tax authorities focus on when auditing R&D expense super deductions?
In 2026, with the establishment of a linkage mechanism between high-tech enterprise re-qualification reviews and additional deduction verifications, enterprises now face not isolated tax risks but a chain reaction across corporate income tax, value-added tax, and individual income tax.
These 8 audit focus areas are the core targets of the current tax review.
Focus 1: Personnel Costs – Unclear Man-Hours Pose the Greatest Risk
Audit Entry Point:The tax system cross-references payroll records, social security data, attendance logs, and R&D timesheets. Falsifying hours worked or expanding the scope of R&D personnel are the most frequently cited violations in annual audit reports.
Common Illegal Tactics:
1. Allocate salaries of administrative and sales personnel to R&D expenses;
2. R&D personnel also engage in production; 100% of their compensation is allocated to R&D without being distributed by work hours.
3. Inflated R&D personnel costs through fictitious hiring and payroll records.
Real Case:Shaanxi Yongming Coal Mine Co., Ltd. underpaid corporate income tax by 184.94 million yuan through irregularly expanding the scope of R&D personnel, fabricating R&D hours, and improperly including certain production and operating materials in R&D material expenses. The company was subsequently required to pay back taxes, late fees, and fines totaling 323.41 million yuan.
Compliance Key Points:
1. Establish a three-tier ledger of "Project–Personnel–Hours," where time records must be cross-verified against attendance logs, access control data, and project progress.
Employees with 2 R&D hours accounting for less than 50% of their total work time should, in principle, not be classified as R&D personnel.
3 If personnel engage in both R&D and non-R&D activities, costs must be allocated based on actual hours worked. Unallocated amounts are not eligible for additional deductions.
Focus 2: Direct Investment — Missing Materials Are the Most Dangerous Signal
Audit Entry Point:The tax system will automatically cross-check the proportion of "direct input costs" against industry averages, reconcile R&D material requisitions with finished goods inventory movements, and verify the consistency between material consumption and experimental records.
Common Illegal Tactics:
1. Improperly classified production and operation materials as R&D material expenses. 2. Falsely recorded high-value material expenditures with no corresponding finished goods output or waste recycling records.
Real Case:Shenzhen Kingstar Applied Materials Co., Ltd. falsely claimed over 8000 million yuan in gold as direct materials under "R&D Expenses," with no corresponding finished products produced or scrap recycling records. The company was found to have fabricated expenses, resulting in an underpayment of corporate income tax amounting to 1621.16 million yuan.
Compliance Key Points:
1. R&D material requisition must be linked to a specific R&D project number. The requisition form shall indicate the project number, ensuring "one request per project with materials tracked by project ID."
2. If fuel and power costs directly consumed by R&D activities are 0 while material costs are abnormally high, an alert is easily triggered.
3. Scrap materials, defective products, and other special revenues generated during R&D must be offset against the corresponding R&D expenses.
Focus 3: Other Costs — The 10% cap is real. Misclassifying expenses renders the effort useless.
Audit Entry Point:Travel expenses, employee welfare benefits, supplementary pension insurance, and supplementary medical insurance are frequently misclassified under "personnel labor costs" for full additional deduction, representing the most common collection error in practice.
Policy Red Line:The total amount of other related expenses shall not exceed 10% of the total R&D expenses eligible for additional deduction. The calculation formula is: (Sum of personnel labor and four other expenses for all R&D projects) × 10% ÷ (1 - 10%). When multiple R&D activities are conducted within a single tax year, the limit for "other related expenses" must be calculated collectively for all projects, rather than individually per project.
Compliance Key Points:
1. Travel expenses, meeting costs, employee welfare benefits, and supplementary pension/medical insurance premiums shall be classified under "Other Related Expenses" and must not be included in "Personnel and Labor Costs";
2. Communication expenses are not among the explicitly listed items and cannot be subject to additional deduction.
3. Calculate the proportion of other expenses before each annual filing and adjust any excess in advance.
Focus 4: Entrusted R&D – Contract nature determines eligibility for additional deduction
Audit Entry Point:There is a fundamental difference in tax treatment between commissioned R&D and purchasing existing technology outcomes. Tax authorities focus on whether the contract specifies the R&D content, technical indicators, and acceptance criteria, as well as whether it has been registered with the relevant science and technology administration department.
Policy Red Line:
1. For domestic entrustment, 80% of the actual amount incurred shall be recognized as R&D expenses for the entrusting party and used to calculate the additional deduction.
2. For entrustments to overseas institutions, 80% of the expenses are included, and only the portion not exceeding two-thirds of eligible domestic R&D expenses is eligible for additional deduction;
3. If the contract's substance involves purchasing existing technical results, it should be treated as an externally acquired intangible asset amortized over time and is not eligible for additional deduction.
Compliance Key Points:
1 Entrusted R&D contracts must be registered and filed with the science and technology administrative department; unregistered technology development contracts are not eligible for super deduction tax benefits.
2. Clearly define the R&D scope, technical specifications, and acceptance criteria in the contract. Retain records of all communications throughout the process as well as the final acceptance report.
3. Related-party commissioned R&D requires special attention to pricing fairness and reasonableness of expense allocation.
Focus 5: Negative List Industries – Industry classification is based on revenue share, not tax registration.
Audit Entry Point:Some companies, although not listed in the negative list for tax registration purposes, derive their primary revenue from industries on the negative list. They face audits and are required to adjust and pay additional taxes upon discovery.
Core Criteria:Do not rely solely on the industry listed in tax registration. The key criterion is the proportion of revenue from core business activities during the year when R&D expenses were incurred, specifically excluding industries on the negative list.
Negative List Industries:Tobacco manufacturing, accommodation and catering, wholesale and retail trade, real estate, leasing and business services, entertainment industry, and other industries designated by the Ministry of Finance and the State Administration of Taxation.
Typical Risks:Software enterprises may include cloud platform rental fees in the scope of additional tax deductions. During an audit, the Yuhuatai District Tax Bureau of Nanjing discovered that a certain technology company had incorrectly claimed additional deductions for cloud platform rental fees. The bureau adjusted the deductible amount downward by 90 million yuan and collected late payment penalties totaling 2 million yuan.
Focus 6: R&D Project Qualification — Formal Compliance Does Not Equal Substantive Compliance
Audit Entry Point:Tax audits no longer focus solely on the formal completeness of project initiation documents and auxiliary ledgers. Instead, they assess whether projects substantively meet the definition of R&D activities—specifically, whether they have clear innovation objectives, systematic organization, and result uncertainty.
Seven Categories of Activities Not Considered R&D：
1. Routine product upgrade;
2. Direct application of a scientific research achievement;
3. Technical support provided to customers after product commercialization;
4. Repetition or minor modifications to existing products, technologies, or processes.
5. Market research, efficiency studies, or management studies;
6. Standard quality control, testing analysis, and maintenance.
7. Social science, arts, or humanities research.
Real Case:Although Company T in Wuxi established an R&D department and facilities, audits revealed that certain projects involved only minor process modifications or simple upgrades, failing to meet the definition of R&D activities. Consequently, corporate income tax amounting to 68.46 million yuan was recovered.
Focus 7: Auxiliary Ledgers – It's not just about having records; they must be internally consistent.
Audit Entry Point:The tax system will cross-check the auxiliary ledger against the chronological ledger, R&D expense detail ledger, and annual corporate income tax return to verify logical consistency in cost aggregation, reasonableness of project allocation, and alignment with financial accounting vouchers.
Common Defects:
1. Auxiliary ledgers must be completed in a single entry at year-end; post-hoc allocation of expenses without supporting records for labor hours or consumption is not allowed.
2. When managing multiple projects in parallel, costs are aggregated and project schedules may be inverted. Remaining materials from closed projects are allocated to new projects.
3. The auxiliary ledger does not match the project initiation documents or the inventors of intellectual property.
Compliance Key Points:
1. Set up auxiliary ledgers by R&D project for real-time collection; year-end entries are not permitted.
2. Multiple R&D activities within a single tax year shall have their other expense limits calculated collectively, rather than separately for each project.
3. The auxiliary ledger must clearly reflect detailed breakdowns for each project, including personnel costs, direct expenditures, and depreciation/amortization.
Focus 8: Cross-Department Data Reconciliation – Finance, R&D, and HR must achieve "Three Ledger Alignment"
Audit Entry Point:The Golden Tax Phase IV has achieved real-time reconciliation between fully digital invoices and ERP systems. The tax system automatically cross-checks the following data:
1. R&D expense auxiliary ledger and full digital invoice details;
2. List of R&D personnel and social security payment records;
3. R&D material requisition and inventory in/out data;
4. R&D project cycle and period of expense incurrence.
Real Case:An AI chip design company claimed a tax deduction of 2300 million yuan. Auditors found that 43% of its R&D expense records were defective: the testing fee was supported by only one invoice, lacking test reports, sample circulation records, and result analysis. Consequently, nearly 1000 million yuan of the claimed deduction remains unsubstantiated.
Audit Trend Analysis
In 2026, tax authorities' oversight of R&D expense super deductions showed three clear trends:
Shift from formal review to substantive verification.Move beyond verifying only the formal compliance of project initiation documents and auxiliary ledgers; conduct in-depth audits to ensure the authenticity of R&D activities, the relevance of expenses to projects, and the integrity of the evidence chain.
Second, shift from point-in-time verification to end-to-end comparison.Golden Tax Phase IV enables automated cross-verification of invoices, ERP systems, social security records, and tax returns. Any logical inconsistency across these data sources may trigger an alert.
Third, shift from single-tax corporate income tax risks to multi-tax cascading effects.Non-compliant allocation of R&D expenses can not only affect corporate income tax but also trigger VAT input tax reversals and issues with individual income tax withholding.
Enterprises are advised to conduct a dedicated self-assessment at least 3–6 months prior to filing, systematically reviewing each item on the checklist above. Authentic R&D activities, genuine expenditures, and truthful declarations remain the non-negotiable foundation for claiming incentives.
If your company encounters specific issues during R&D expense allocation or super deduction filing, feel free to leave a message for discussion.