CIR 2026: Complete Guide to France's R&D Tax Credit for SMEs and Startups

Short answer — The Crédit d'Impôt Recherche (CIR) is France's main fiscal incentive for research and development (R&D). In 2026, it allows businesses to recover between 20% and 50% of their R&D expenses as a tax credit offset against corporate tax. This guide covers the entire mechanism: eligibility, qualifying expenses, calculation, filing and audit considerations.

History and context

CIR was created in 1983 to encourage French businesses to invest in research. It is codified in Article 244 quarter B of the French General Tax Code (CGI). In 2026, it remains the primary public support mechanism for R&D in France, with an annual amount of approximately €6 billion in tax credits.

Why is CIR essential for SMEs?

CIR enables businesses to:

• Significantly reduce R&D costs: an SME spending €500,000 on R&D can recover up to €200,000 in CIR
• Finance innovation without diluting equity (unlike fundraising)
• Accelerate development of new products or processes
• Recruit talent (R&D hires count as eligible expenses)

CIR vs CII: what's the difference?

Key point: CIR and CII are combinable up to the €100,000 limit for CII. A business can therefore benefit from both mechanisms on different operations.

Fundamental research

Fundamental research consists of experimental or theoretical work aimed at acquiring new knowledge, without a specific industrial or commercial application. It aims to understand phenomena without an immediate goal of practical application.

Examples:

• Theoretical studies on materials
• Fundamental physics research
• Pharmacological studies without direct application

Experimental development

Experimental development aims to acquire new knowledge or techniques for creating new products, processes or services, or for improving existing ones. It differs from fundamental research by its applied nature.

Examples:

• Development of a functional prototype
• Creation of new software with technical innovation
• Development of a new manufacturing process
• Testing and validation of new chemical formulas

What is NOT eligible for CIR

Excluded activities:

• Purely commercial research: market research, pre-production testing
• Quality control without innovative component
• Standard adaptation of an existing product
• Routine development without technical advances
• Preventive or corrective maintenance work

1. Research personnel

Eligibility criteria: only researchers and technicians directly involved in R&D projects are concerned. Time spent on projects must be documented (timesheets).

Expenses taken into account:

• Gross salaries and employer social charges
• Internship allowances (if the internship is linked to an R&D project)

Calculation:

• PhDs: 2 × SMIC hourly rate (approximately €58 / hour in 2026)
• Other researchers and technicians: 2 × SMIC hourly rate if time dedicated to R&D is ≥ 50%; 2 × SMIC hourly rate if ≥ 10% but < 50% (within the limit of €1 per euro of turnover)

2. Depreciation of equipment

Investments in equipment used for R&D are eligible:

• Scientific and laboratory equipment
• Dedicated IT equipment (servers, workstations)
• Specific machinery and tools
• Software directly linked to R&D projects

Rule: equipment must be assigned to R&D operations for at least 12 months. Depreciation is calculated over the normal useful life.

3. Operating expenses

Two methods to choose from:

Flat-rate method: 43% of research personnel expenses. This method is simple but can be disadvantageous if actual operating expenses are higher.

Actual cost method: justified by any means (invoices, contracts, etc.). Use when actual costs exceed 43% of salaries.

4. Technology watch and patents expenses

Technology watch: technical documentation expenses, subscriptions to scientific databases, participation in technical conferences.

Patents: filing, maintenance and defense expenses for patents resulting from R&D work.

Limit: technology watch and patent expenses cannot represent more than 60% of research personnel expenses.

5. R&D subcontracting

Expenses for subcontracting to accredited research organisations are eligible:

• Public laboratories (CNRS, INSERM, Universities)
• Contract research companies
• Industrial technical centres

Condition: the subcontractor must be accredited by the Ministry of Research.

Limit: subcontracting expenses to related companies (same group) are not eligible.

6. Insurance premiums

Insurance premiums covering research activities (research insurance) are eligible.

CIR rates

Rate increase for young innovative enterprises

Businesses meeting JEI criteria (less than 8 years old, R&D expenses > 15% of personnel costs) benefit from an increased rate:

Calculation example

Standard SME (non-JEI), R&D expenses: €400,000 (including €300,000 personnel)

CIR = €300,000 × 30% = €90,000

JEI startup (less than 5 years, R&D expenses: €200,000)

CIR = €200,000 × 50% = €100,000

Is CIR limited by an expense cap?

No, CIR has no cap on R&D expenses, unlike CII. A business can claim as much CIR as it has eligible expenses, without any annual or cumulative ceiling.

Filing form

CIR is declared on form n° 2069-A (along with its annexes) together with the business tax return (tax package).

Documents to attach:

• Detailed annex of expenses by R&D project
• Description of calculation methods used
• Subcontractor attestations (if applicable)
• Employee timesheets (upon administration request)

The CIR advance ruling (rescrit)

The CIR advance ruling is a procedure to obtain prior approval from the administration on the eligibility of a project for CIR. It is a major securing tool.

Procedure:

1. Detailed description of the R&D project
2. Submission to the tax office (regional directorate)
3. Administration response within 3 months
4. In case of positive response: full securing for 3 years

When to use the advance ruling?:

• Complex or borderline innovative projects
• Significant CIR amounts (> €100,000)
• First CIR for the business
• Project involving technologies new to the business

Carryback and carryforward of CIR

Unimputed CIR: CIR not offset against corporate tax can be:

• Carried back: immediate recovery for 3 years
• Carried forward: offset against corporate tax of the following 3 years

Carryback: if CIR for year N exceeds IS for the year, the excess can be carried back for 3 years and give rise to a refund.

Assessing the innovative character

The tax administration may challenge the eligibility of R&D operations during an audit. The criteria used are:

1. Innovation criterion: operations must involve a significant technical advance compared to the state of the art
2. Uncertainty criterion: there must be uncertainty about technical or economic feasibility
3. Method criterion: operations must be based on a rigorous scientific approach

State of the art is determined by scientific publications, existing patents, current technical standards.

Documentation of research hours

A reliable audit trail (piste d'audit fiable, PAF) is mandatory. The business must be able to demonstrate:

• Time spent by each employee on each project
• Nature of tasks performed
• Link with R&D objectives

Timesheets: recommended by the administration. They must be:

• Individual
• Monthly
• Checked by a manager
• Archived for 6 years

Risks during audit

Best practices before audit

1. Internal annual audit: verify file compliance before year-end
2. Expert support: validate the eligible character of projects
3. Continuous documentation: do not wait for audit to build the file
4. Preventive ruling: secure at-risk projects

The Innovation Tax Credit (CII)

CII (Art. 244 quater G CGI) is dedicated to SMEs carrying out technological innovation expenses. It partially replaces CIR for activities close to market launch.

Characteristics:

• Rate: 20%
• Cap: €100,000 / year
• Qualifying expenses: prototypes, pilot installations
• Businesses: SMEs (< 250 employees, turnover < €50M)

CIR + CII combination strategy

Caution: the same expenses cannot be claimed under both CIR and CII. The choice must be made when filing.