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(1)This Chapter applies where—
(a)an individual (“the worker”) personally performs, or is under an obligation personally to perform, services for the purposes of a business carried on by another person (“the client”),
(b)the services are provided not under a contract directly between the client and the worker but under arrangements involving a third party (“the intermediary”), and
(c)the circumstances are such that, if the services were provided under a contract directly between the client and the worker, the worker would be regarded for income tax purposes as an employee of the client.
(2)In subsection (1)(a) “business” includes any activity carried on—
(a)by a government or public or local authority (in the United Kingdom or elsewhere), or
(b)by a body corporate, unincorporated body or partnership.
(3)The reference in subsection (1)(b) to a “third party” includes a partnership or unincorporated body of which the worker is a member.
(4)The circumstances referred to in subsection (1)(c) include the terms on which the services are provided, having regard to the terms of the contracts forming part of the arrangements under which the services are provided.
(5)In this Chapter “engagement to which this Chapter applies” means any such provision of services as is mentioned in subsection (1).