What are the IR35 tests for employment status?
Answered 11 March 2026
Based on the retrieved sources, I can now provide a comprehensive answer on the IR35 employment status tests.
IR35 Employment Status Tests
What the law says
IR35 is contained in sections 48 to 61 ITEPA 2003 (for small clients) and sections 61K to 61X ITEPA 2003 (for public authorities and medium/large clients).
The legislation applies where an individual provides services to a client via an intermediary in circumstances where, had the worker contracted directly with the client, they would have been an employee. There is no third intermediate "worker" category — the only question is whether the notional contract is one of service (employment) or not.
HMRC guidance / practice
The Notional (Hypothetical) Contract
The legislation requires construction of a notional or hypothetical contract between the worker and the client, looking through the intermediary. Regard must be had to the terms of the actual contracts under which services are provided.
The Three-Stage Ready Mixed Concrete Test
The leading framework is the Ready Mixed Concrete test, applied in three stages:
Stage 1 — Mutuality of Obligation (MOO) There must be an "irreducible minimum" of mutual obligation: the client must be obliged to pay the worker, and the worker must be obliged to do the work. There is no requirement for an ongoing obligation to provide work outside the contractual period — MOO can exist during the currency of a fixed-term contract.
Stage 2 — Control There must be a sufficient degree of control over the worker. The right to control is a necessary pre-condition of employment. The fact that the right exists carries significant weight even where little control is actually exercised in practice.
Stage 3 — Multi-factorial Evaluative Assessment If Stages 1 and 2 are met, a multi-factorial evaluative assessment of all the circumstances is conducted. MOO and control can be re-weighed at this stage alongside all other relevant factors. The terms of the contract remain central, but admissible factors are not confined to them.
Key Factors at Stage 3
HMRC identifies the following as particularly relevant:
| Factor | Pointer towards employment | Pointer towards self-employment |
|---|---|---|
| Personal service | Worker personally required | Genuine, unfettered right of substitution |
| Mutuality of obligation | Obligation to offer and accept work | No obligation beyond the specific engagement |
| Control | Engager controls what, how, where, when | Worker has autonomy over how work is done |
| In business on own account | Economically dependent on one engager | Multiple clients, itinerant working pattern |
| Exclusivity | Restricted from working for others | Free to work for multiple engagers |
| Financial risk | Fixed pay, no risk of loss | Risk of loss; opportunity to profit from sound management |
| Equipment | Engager provides all equipment | Worker provides own equipment |
| Integration | Part and parcel of the organisation | Presents as independent; no line management role |
| Length/pattern of engagement | Long, continuous engagement | Short-term, multiple engagements |
| Sick pay, holiday pay, pension | Provided | Not provided |
| Intention of the parties | Relevant but given minimal weight | Relevant but given minimal weight |
"It is a matter of evaluation of the overall effect of the detail, which is not necessarily the same as the sum total of the individual details. Not all details are of equal weight or importance in any given situation."
Personal Service and Substitution
The correct analysis for substitution clauses in IR35 cases is the dominant feature test from Pimlico Plumbers: a limited right of substitution does not override the dominant feature of the arrangement if that is for the personal service of a specific worker. Where a substitution clause has never been used in practice, it may carry little weight.
Citation sources
Type of income Statutory provisions Guidance Income of agency workers Sections 44 to 47 ITEPA 2003 Employment Status Manual Workers providing services through intermediaries to small clients (the “IR35” provisions) Sections 48 to 61 ITEPA 2003 Employment Status Manual Managed Service Companies Sections 61A to 61J ITEPA 2003 Employment Status Manual Workers’ services provided through intermediaries to public authorities or medium or large clients (the “IR35” provisions) Sections 61K to 61X ITEPA
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through items on a check list to see whether they are present in, or absent from, a given situation. The object of the exercise is to paint a picture from the accumulation of detail. The overall effect can only be appreciated by standing back from the detailed picture which has been painted, by viewing it from a distance and by making an informed, considered, qualitative appreciation of the whole. It is a matter of evaluation of the overall effect of the detail, which is not necessarily the same
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