The Tax Credits Up-rating Regulations 2006
Section 41 of the Tax Credits Act 2002 (c. 21) requires the Treasury, in each tax year to—review the amounts referred to in subsection (2) of that section,prepare a report of each review; including a statement of what each of the amounts would be if it had fully retained its value; andpublish the report and lay a copy of it before each House of Parliament.