Section 4 Class 1 contributions (incidence)
For the purposes of this Act, there shall for every tax year be—
a lower earnings limit for Class 1 contributions, being the level of weekly earnings at which employed earners become liable for such contributions in respect of the earnings from their employments ; and
an upper earnings limit for Class 1 contributions, being the maximum amount of weekly earnings in respect of which such contributions are payable;
and the lower and upper earnings limits shall be respectively £11 and £69.
Subject to section 6 below, where in any tax week earnings are paid to or for the benefit of an earner in respect of any one employment of his, being employed earner's employment, and—
he is over school-leaving age ; and
the amount paid is equal to or exceeds the current lower earnings limit (or the prescribed equivalent in the case of earners paid otherwise than weekly),
there shall be payable, in accordance with this section (and, except as provided by this Act, without regard to any other payment of earnings to or for the benefit of the earner in respect of any other employment), a primary and a secondary Class 1 contribution.
The primary contribution shall be payable by the earner and the secondary contribution shall be payable by the secondary Class 1 contributor.
Subject to subsection (5) below, the secondary contributor, in relation to any payment of earnings to or for the benefit of an employed earner, is—
in the case of an earner employed under a contract of service, his employer;
in the case of an earner employed in an office with emoluments, either—
such person as may be prescribed in relation to that office, or
if no person is prescribed, the government department, public authority or body of persons responsible for paying the emoluments of the office.
In relation to employed earners who—
are paid earnings in a tax week by more than one person in respect of different employments ; or
work under the general control or management of a person other than their immediate employer,
and in relation to any other case for which it appears to the Secretary of State that such provision is needed, regulations may provide that for the purposes of this section the prescribed person is to be treated as the secondary Class 1 contributor in respect of earnings paid to or for the benefit of an earner.
The amount of a Class 1 contribution shall be a percentage of so much of the earnings paid in the week, in respect of the employment in question, as does not exceed the current upper earnings limit (or the prescribed equivalent in the case of earners paid otherwise than weekly); and, subject to regulations under sections 128 to 132 below—
the primary contribution shall be 5-5 per cent. or 2 per cent., according to whether the earner is liable to contribute at the standard rate or the reduced rate; and
the secondary contribution shall be 8-5 per cent.