“Subject to any provision of the Taxes Acts prescribing a longer or shorter period, no claim for relief in respect of income tax or capital gains tax may be made more than five years after the 31 st January next following the year of assessment to which it relates.”
“ 1 – (1) This paragraph applies where – (a) a person has paid an amount by way of income tax or capital gains tax but the person believes that the tax was not due… (2) The person may make a claim to the Commissioners for repayment or discharge of the amount. … 3 – (1) A claim under this Schedule may not be made more than 4 years after the end of the relevant tax year. (2) In relation to a claim made in reliance on paragraph 1(1)(a), the relevant tax year is – (a) where the amount paid, or liable to be paid, is excessive by reason of a mistake in a return or returns under section 8, 8A or 12AA of this Act, the tax year to which the return (or, if more than one, the first return) relates, and (b) otherwise, the tax year in respect of which the payment was made.”
“ 10 – (1) In relation to a relevant claim, paragraph 3(1) of Schedule 1AB to TMA 1970 (inserted by this Part of this Schedule) has effect as if for “more than 4 years after” there were substituted “more than 5 years after the 31 st January next following”. (2) “Relevant claim” means a claim within paragraph 3(2)(a) of Schedule 1AB to TMA 1970 that – (a) is made before1 April 2012 by a person other than a company, and (b) satisfies sub-paragraph (3). (3) A claim satisfies this sub-paragraph if notice requiring the return (or, if more than one, the first return) mentioned in paragraph 3(2)(a) of Schedule 1AB to TMA 1970 was not given within one year of the end of the tax year to which the return relates.”