a decision under section 14(1), 15(1), 16(1), 19(3) or 20(1) or (4) or regulations under section 21,

the relevant section 18 decision in relation to a person or persons and a tax credit for a tax year and any revision of that decision under that section,

a determination of a penalty under paragraph 1 of Schedule 2, F1...

a decision under section 36A or 36C that working tax credit is not payable (or is not payable for a particular period), and

a decision under section 37(1).

in a case in which a decision must be made under subsection (6) of section 18 in relation to the person or persons and the tax credit for the tax year, that decision, and

in any other case, the decision under subsection (1) of that section in relation to the person or persons and the tax credit for the tax year.