Multiple Concurrent Clients as Evidence of Being in Business

Multiple concurrent clients as evidence of being in business on your own account

One question that comes up repeatedly in IR35 discussions is whether working for several clients, at the same time or one after another, helps a contractor's case. The short answer is: it can be relevant evidence, but it is not a standalone test and it does not, by itself, settle the question. This article looks at what HMRC's own guidance says about multiple clients IR35 evidence, and where it fits into the wider picture.

What HMRC's guidance actually says

HMRC's Employment Status Manual sets out a test often referred to as "in business on your own account". According to HMRC, the key distinction is between someone who works under the control of, and as part of, another business, and someone who "goes it alone" and sets up on their own account, taking on responsibility for the success or failure of their own enterprise (ESM0514).

Within that broader test, HMRC's manual specifically addresses multiple engagements. It states that a worker who works for a number of separate clients, whether consecutively or concurrently, or who takes on a large number of short-term contracts with different clients, is likely to be running a business (ESM11140). A dedicated section on "considering the evidence: multiple engagements" goes further, confirming that prior, simultaneous, or subsequent services provided to other clients are a central consideration in whether someone is carrying on business on their own account (ESM8590).

HMRC's general "Working for yourself" guidance echoes this in plainer language: if you have several customers at the same time, you are probably running a business. It also makes clear that a person can run a business and be employed at the same time, so the presence of one salaried role alongside contracting work does not automatically undermine a self-employed status argument (Working for yourself).

Evidence, not a tick-box test

It is important not to overstate what this means in practice. HMRC's manual is explicit that status must be considered on an engagement-by-engagement basis: each contract is assessed on its own facts, and having other clients elsewhere does not automatically make a particular engagement outside IR35 (ESM8590). There is no fixed client-count or minimum duration in the guidance that flips an engagement from inside to outside. HMRC says there is no fixed cut-off point in duration, and the wider picture has to be weighed in every case.

This matters because the off-payroll working rules ultimately turn on a single question for each engagement: would the worker have been an employee if they had contracted directly with the end client, rather than through their own limited company or other intermediary (Understanding off-payroll working (IR35))? Working for several clients contractor arrangements can support the picture of someone in business on their own account, but they sit alongside other factors such as control, the right of substitution, and financial risk. Recent case law, including the Supreme Court's decision in the PGMOL case, has reinforced that substitution and control are central to the status question, rather than any single factor like client count or the absence of mutuality of obligation.

How this fits into a contractor's evidence file

For contractors building a picture of contractor evidence outside IR35, having multiple concurrent or consecutive clients is one useful data point among several. Practical evidence that often sits alongside it includes:

• Contracts and invoices showing work for different clients in overlapping periods
• Marketing activity, a business website, or a client-facing profile showing the business is actively sought out by multiple customers
• Insurance, equipment, or other business costs borne independently of any one client
• Evidence of the right to send a substitute, and instances where control over how work is done sat with the contractor rather than the client

None of these factors is decisive on its own. HMRC's guidance is clear that the full picture of the working relationship, not any single fact, determines the outcome for each engagement.

Client-led status determinations

Because status is engagement-specific, it is the end client, not this platform, who is legally responsible for the IR35 status determination in the public sector and for medium/large private sector engagements, issued as a Status Determination Statement (SDS). Where a job listing states that a role is regarded by the client as outside IR35, that is the client's own assessment of that engagement, based on its own view of the working practices, and not a status guaranteed by any job board. HMRC has also confirmed that CEST outputs and similar tools are not determinative in themselves; they are simply an aid to reaching a decision, and the underlying facts of the engagement are what matters.

Contractors comparing opportunities may find it useful to look across current outside-IR35 contracts and day-rate benchmarks to understand how listings in a given sector are typically described, while keeping in mind that each engagement still needs its own assessment.

Where to go for a proper assessment

If you want to understand how your own pattern of clients, contracts, and working practices might be viewed under the off-payroll working rules, that requires a fact-specific review of your actual arrangements. A qualified IR35 contract reviewer or contractor accountant can look at your engagements individually and, where relevant, help you build a supporting evidence file. Questions about employment rights, as distinct from tax status, fall to the Fair Work Agency rather than to HMRC or to a jobs platform.

This platform does not determine, verify, or warrant IR35 status; the SDS is the client's legal responsibility. Contractors should take their own advice and consider IR35 insurance.