The relevant bits are:
S7(3) of the act
"(3) In this Part "the relevant income" means-
(a) if an amount is prescribed for the purposes of this paragraph and the current year income exceeds the previous year income by not more than that amount, the previous year income,
(b) if an amount is prescribed for the purposes of this paragraph and the current year income exceeds the previous year income by more than that amount, the current year income reduced by that amount,
(c) if an amount is prescribed for the purposes of this paragraph and the previous year income exceeds the current year income by not more than that amount, the previous year income,
(d) if an amount is prescribed for the purposes of this paragraph and the previous year income exceeds the current year income by more than that amount, the current year income increased by that amount, and
(e) otherwise, the current year income."
and SI 2002 No. 2008 The Tax Credits (Income Thresholds and Determination of Rates) Regulations 2002
5. The amount prescribed for the purposes of section 7(3)(a) and (b) of the Act is £2,500."
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