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What makes a project qualify for R&D tax relief?
Not every project involving science, engineering or technology qualifies for UK R&D tax relief. Eligibility depends on the purpose of the project, the scientific or technological advance sought and the uncertainties the work attempted to resolve.

Understanding that distinction has always been essential to preparing an accurate and well-supported claim.
The legislative test
Under the official guidelines on the meaning of R&D for tax purposes, R&D takes place when a project seeks to achieve an advance in science or technology. The qualifying activities are those that directly contribute to achieving that advance by resolving scientific or technological uncertainty, together with certain qualifying indirect activities.
An advance must relate to overall knowledge or capability in a field of science or technology. It is not enough for the product, process or method to be new to the company if the underlying solution is already publicly available or could readily be worked out by a competent professional in the field.
What is scientific or technological uncertainty?
Scientific or technological uncertainty exists when a competent professional cannot readily determine whether something is scientifically possible or technologically feasible, or how it can be achieved in practice, using publicly available knowledge and established capability in the field.
This can include uncertainty created by the complexity of a wider system, even where the individual components are understood. However, assembling components to an established pattern, applying standard methods or making routine adjustments would not normally meet the test.
A useful question is: could a competent professional in the relevant field readily deduce how to achieve the intended outcome from the knowledge and capability already available?
If the answer is yes, the work is unlikely to qualify. If the answer is no, and a programme of investigation or development was required to attempt to resolve the uncertainty, the relevant activities may fall within the definition of R&D.
What may indicate a qualifying project?
Depending on the facts, a project may seek an advance by extending overall knowledge or capability, creating or appreciably improving a product, process, material, device or service through scientific or technological change, or combining technologies where the required method or outcome could not readily be deduced.
Qualifying work may also arise when a concept is known to be feasible, but uncertainty remains over how to make it sufficiently reliable, reproducible or cost-effective in practice. The presence of testing, modelling or prototyping does not by itself establish eligibility; those activities must contribute to resolving the identified scientific or technological uncertainty.
Qualifying and non-qualifying work can sit within the same project
A commercial project may contain both qualifying and non-qualifying elements. Work that directly contributes to resolving the scientific or technological uncertainty may qualify, while routine production, commercial planning, market research, cosmetic design and other activities that do not contribute to resolving that uncertainty will generally fall outside the R&D definition.
The role of technical analysis is to establish the boundaries of the R&D project and separate the relevant activities clearly and proportionately. Over-claiming routine work creates risk, while under-claiming activity that meets the criteria can leave potential value unclaimed.
What should a claim explain?
A clear R&D submission should set out the baseline of scientific or technological knowledge or capability, the advance the project sought, and the specific uncertainties faced. It should explain why those uncertainties could not readily be resolved by a competent professional and describe the work undertaken to attempt to resolve them.
The explanation should focus on the scientific or technological issues rather than relying on broad descriptions of the commercial project. Evidence may include technical records, design documents, testing results, project communications and input from the competent professionals involved.
A practical way to assess the work
When reviewing a project, consider what was already known at the outset, what advance the team sought and where the limits of established knowledge or capability created uncertainty. Then examine which activities were undertaken to address that uncertainty and when it was resolved, or when work to resolve it ceased.
Engineering skill or project complexity alone does not determine eligibility. The central question is whether the project sought an advance in science or technology and whether the relevant work contributed to resolving scientific or technological uncertainty. Making that distinction carefully, and supporting it with appropriate evidence, is fundamental to an accurate R&D tax claim.
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