Part 13... expenditure on research and development
Chapter 2Relief for loss-making, R&D-intensive SMEs
Reliefs: further provision
F11045ARequirement to make a claim notification
(1)
A company may not make a claim under section 1044(6) (an “additional deduction claim”) after the end of the claim notification period unless—
(a)
the company has made an R&D claim during the period of three years ending with the last day of the claim notification period,
(b)
the company makes a claim notification in respect of the additional deduction claim within the claim notification period, or
(c)
the accounting period in respect of which the additional deduction claim is made falls within the same period of account as another accounting period in respect of which the company has made an R&D claim or a claim notification.
(2)
For the purposes of subsection (1)(a) ignore any R&D claim for an accounting period beginning before 1 April 2023 that is included in the company’s company tax return only by virtue of an amendment made on or after that date (see paragraph 83B(2) of Schedule 18 to FA 1998).