The UK scheme has different benefits for Large Companies (LCs) and Small and Medium Enterprises (SMEs). The regime offers profit-making SMEs an additional 130% deduction (230% super deduction) of qualifying expenditure from taxable profits; Or loss-making SMEs a cash credit of 14.5%. LCs are offered a 12% expenditure credit (R&DEC).
Technical justification of the claim is not required by law. However a document stating the nature of R&D activities is highly recommended.
Eligible costs have to fit within prescribed cost categories.