Where a secondary Class 1 contribution is payable, the amount of that contribution shall be the secondary percentage of so much of the earnings paid in the tax week, in respect of the employment in question, as exceeds the current earnings threshold (or the prescribed equivalent).

For the purposes of subsection (1) above, the secondary percentage shall be 12.2 per cent., but the percentage is subject to alteration under section 129 of the Administration Act.

Subsection (1) above is subject to regulations under section 6(5) above and sections 116 to 119 below and to section 37 of the Pensions Act.

Regulations under subsection (1) above shall be made by the Treasury.