CIR: Mistakes Startups Should Avoid When Applying for It in 2026

The Research Tax Credit (CIR) allows companies that invest in research and development to recover a significant portion of their expenses in the form of a tax credit or refund.

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Using it requires a thorough understanding of the eligibility criteria and administrative requirements; otherwise, common mistakes may be made that could undermine the system.

Common mistakes startups make regarding the CIR

1) Confusing product development with scientific research

Probably the most common mistake. Many startups consider all technical development to be part of R&D.

However, the CIR does not cover all software or product development activities.

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To be eligible, the research must aim to resolve a scientific or technological uncertainty that cannot be resolved using current knowledge.

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Thus, creating a web platform or adding features to software is generally not considered R&D. However, the creation of a new algorithm, a novel technical architecture, or an experimental process may qualify for the CIR.

2) Failure to demonstrate the technological barrier

A strong CIR application must clearly explain:

• The scientific problem encountered,
• The current state of the art,
• The experiments conducted,
• The results obtained.

Some startups describe their product or innovation in marketing terms, without explaining the scientific challenges they have faced. In such cases, the government may consider the work to be simply a matter of conventional engineering.

3) Overstate eligible expenses

Another common mistake is to include functions that do not fall under the category of research in the CIR tax base:

• Product Management
• UX Design
• Project Management
• Technical Support

The program primarily covers scientific and technical work carried out by engineers or researchers.

4) Poor tracking of engineers' time

In a startup, technical teams often handle a variety of tasks, including R&D, product development, maintenance, and support.

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However, only the portion of time actually spent on research can be included in the CIR. The tax authorities may request specific supporting documentation, such as timesheets or detailed descriptions of the work performed.

5) Insufficient scientific evidence

The CIR is based on a self-reporting system: the company reports its expenses, but must be able to provide supporting documentation in the event of an audit.

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An incomplete, overly brief, or insufficiently documented application may result in the partial or total denial of the tax credit.

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The CIR: A Key Mechanism for Supporting Innovation

The Research Tax Credit is a tax incentive designed to encourage companies to invest in research and development activities. All companies subject to taxation in France are eligible for this credit, regardless of their size or industry, provided they conduct eligible R&D work.

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The mechanism is relatively simple in principle: research-related expenses are included in a tax base to which a tax credit rate is applied.

The main rates are as follows:

• 30% of R&D expenses up to 100 million euros
• 5% above that threshold

Eligible expenses include, among others:

• Salaries of engineers and researchers
• Related payroll taxes
• The equipment used for research
• Outsourcing to accredited organizations
• Patent and intellectual property costs

The tax credit received can be applied against corporate income tax. If the company is not yet turning a profit—which is common for a startup— the credit may be refunded or carried forward, depending on the circumstances.

Why the CIR is particularly strategic for startups

For startups, research expenses often account for a significant portion of their costs. The phases of technology design, algorithm development, and prototyping require large, highly skilled technical teams.

In this context, the CIR plays several key roles.

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It helps reduce the actual cost of R&D. A startup that invests €500,000 in research activities can recover approximately €150,000 through the program.

It helps ensure cash flow stability during the development phase. Technology companies often take several years to become profitable. The CIR thus serves as an indirect source of financial support, helping to extend their runway.

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Finally, it also sends a positive signal to investors. A startup that can effectively utilize the CIR demonstrates a certain level of maturity in structuring its financial strategy and managing public funding.

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According to several analyses of the startup ecosystem, the combination of government incentives (CIR, CII, grants) and private funding is often seen as an indicator of reliability and effective cash burn management.

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The CIR in a Strategy for Financing Startup Innovation

For startups, the CIR should not be viewed as merely a standalone tax benefit. It is generally part of a broader strategy for funding innovation.

Companies often combine several approaches:

• Government aid and grants,
• Innovative startup status,
• Innovation Tax Credit (CII),
• Funding from Bpifrance.

This approach helps minimize dilution during fundraising rounds and extends the company’s ability to invest in R&D.

When properly structured, the CIR can become a cornerstone of technology financing and support the growth of startups over several years.

Securing Your CIR: The Importance of Support for a Startup

The regulatory complexity and scientific requirements of the CIR often make it necessary to seek guidance from specialists in innovation financing.

An experienced firm can, for example:

• Assess the eligibility of projects,
• Organizing scientific documentation,
• Ensure a stable budget,
• Optimize the combination of the CIR, grants, and other public programs.

For more than twenty years, Dynergie has been helping innovative companies structure and finance their technology projects.

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With its recognized expertise in public funding for innovation, Dynergie helps startups and tech companies to:

• Identify grants and subsidies that are suitable for their projects,
• Organize their funding applications,
• Secure their tax incentives, such as the CIR.

To learn how to effectively access government grants and accelerate funding for your innovation projects, contact us.