Research and development (R&D) is defined as activities falling to be treated as such in accordance with generally accepted accounting practice (GAAP), but the Treasury has powers to modify the definition by specific regulations.
The relevant standards for this are SSAP 13 under UK GAAP and IAS 38 under International GAAP.
For the purpose of the tax reliefs available, R&D has the meaning given by section 1138 of the Corporation Tax Act 2010.
This means activities which fall to be so treated in accordance with GAAP, but not including oil and gas exploration and appraisal.
The BIS website provides guidelines on the meaning of research and development for tax purposes.
The current definition is:
'R&D for tax purposes takes place when a project seeks to achieve an advance in science or technology.
The activities which directly contribute to achieving this advance in science or technology through the resolution of scientific or technological uncertainty are R&D.
Certain qualifying indirect activities related to the project are also R&D.
Activities other than qualifying indirect activities which do not directly contribute to the resolution of the project’s scientific or technological uncertainty are not R&D.'