How do I know if I'm doing R&D?

Where the definition comes from

The definition is not really in the tax legislation. Corporation tax law starts with the accounting meaning of research and development, then hands the substance over to guidelines issued by the Secretary of State. Those guidelines — the Guidelines on the Meaning of Research and Development for Tax Purposes — are the test. They are short, numbered, and the tribunals read them closely: the High Court has described the R&D code as detailed and meticulously drafted, leaving little room to read in a purpose the words do not carry.

Two practical consequences. First, the accounting treatment of your development spending has almost no bearing on whether it is R&D for tax. Second, arguing that your work was clearly innovative and therefore ought to qualify does not work. The guidelines ask specific questions, and you have to answer those questions.

The four parts of the test

1. Is there a project?

A project is a number of activities conducted to a method or plan in order to achieve an advance. That wording does real work. It means R&D is not an atmosphere of general technical improvement across your business; it is a bounded piece of work with an aim.

It also means the R&D project and the commercial project are usually not the same thing. A commercial project to launch a product includes procurement, design, market testing, regulatory work, manufacturing setup, and much more. The R&D project inside it is the part aimed at resolving the scientific or technological uncertainty, and it may be a small fraction of the whole.

2. Is it in a field of science or technology?

Science is the systematic study of the nature and behaviour of the physical and material universe. Technology is the practical application of scientific principles and knowledge.

Work in the arts, humanities and social sciences, including economics, is not science for this purpose. Neither is work whose only novelty is commercial, organisational or aesthetic. Mathematics is a special case: for accounting periods beginning on or after 1 April 2023, a mathematical advance is treated as science in its own right, whether or not it describes the physical world. That change matters to quantitative finance, cryptography, optimisation and parts of machine learning, and it is one of the few genuine widenings of the definition in twenty years.

3. Does it advance the field, not just your company?

This is the part most claims fail on. The advance has to be an advance in the field’s overall knowledge or capability—what is publicly available, or readily deducible from what is publicly available, to a competent professional. Your own starting point is irrelevant.

So a system that is new to you, new to your competitors, or new to your industry is not automatically an advance. Taking existing science or technology and deploying it in a new context with only minor or routine changes is not an appreciable improvement, and neither is work that simply brings you into line with what the field can already do.

The advance does not have to be achieved. A failed project is still R&D, and failure is often the cleanest evidence that the uncertainty was real. Nor does it matter that someone else has already done it if they did not publish it—work to reach an advance that exists only as somebody’s trade secret can still be an advance.

4. Was there uncertainty a competent professional could not readily resolve?

Scientific or technological uncertainty exists when knowledge of whether something is possible or feasible, or of how to achieve it in practice, is not readily available or deducible by a competent professional working in the field.

“Readily deducible” means capable of being worked out from what is already known without significant effort. It does not mean easy. And the uncertainty has to be technological: not knowing whether customers will buy it, whether the budget will hold, or how long the work will take is not the kind of uncertainty that counts.

The competent professional is the yardstick for parts three and four, which is why identifying yours — by name, in the right field — is the first practical step in preparing any claim.

When does the R&D start and stop?

R&D begins when work to resolve the uncertainty starts, and ends when the uncertainty is resolved, or work to resolve it stops. It also ends when the knowledge sought is codified in a form a competent professional could use, or when a prototype or pilot with all the functional characteristics of the final product is produced.

That gives you two boundaries. Work before the uncertainty was identified — scoping the commercial opportunity, deciding to build something — is outside. So is work after it was resolved: proving out a solution that already works, testing for regulatory certification once functionality is settled, scaling up to production. Both ends are routinely over-claimed.

Position for accounting periods beginning before 1 April 2023

The earlier guidelines, issued in 2004 and updated in 2010, ask the same four questions in almost the same words, and the case law decided under them applies equally to the current ones.

The one substantive difference is mathematics. Under the earlier guidelines, a mathematical advance was only within scope where it advanced the representation of the nature and behaviour of the physical and material universe. Pure mathematical work was outside. For accounting periods beginning before 1 April 2023, that older, narrower position still applies, and a claim for periods on either side of the boundary must be split.