“Subject to sections 19, 20, 21A, 21B and 21C and regulations under 21 (And to any revision under subsection (5) and (9) and any appeal … (b)...in any other case, the decision under subsection (1) in relation to a person or persons and a tax credit for a tax year Is conclusive as to the entitlement of the person....to the tax credit for the tax year and the amount of the tax credit to which he was entitled.... for the tax year.”
“((1A)) An appeal may not be brought under S38(1) against a decision unless a review of the decision has been carried out under s21A notice of the conclusion on the review has been given under s21A(3)).”
“2.1 This instrument amends legislation so that a person will need to ask HMRC to reconsider its decision on tax credits, child benefit or guardian's allowance awards before making an appeal to the tribunal, similar to the process for universal credit.”