IR35 and working practices: why the contract wording is not enough
How control, substitution and the wider working relationship show up in the real life of a contract engagement.
What to take away
- Status follows the full engagement, including implied and verbal arrangements.
- A clause must be genuine and usable in practice.
- Document changes to scope, control and delivery as the contract progresses.
The engagement is wider than the PDF
HMRC describes a contract for off-payroll purposes as written, verbal or implied. That means emails, operating habits and management expectations can matter alongside the signed document.
The safest approach is consistency. The statement of work, contract, onboarding and everyday delivery should describe the same commercial relationship.
Control in practical terms
Control is not limited to technical supervision. Consider who decides the deliverables, order of work, location, schedule and method. A client can define an outcome and maintain governance without necessarily directing every aspect of delivery.
Substitution must be real
A substitution clause is stronger when the contractor can identify, arrange and pay a qualified substitute, subject to reasonable client safeguards. It is weaker when every replacement would be refused or the individual must always perform the work personally.
Look at the wider commercial picture
No single factor should be treated as a magic switch. Review the relationship as a whole.
- Is the contractor paid for a deliverable or simply for ongoing availability?
- Who corrects defective work and bears the cost?
- Is the contractor part of the client's organisation or an external supplier?
- Is there an expectation of continuous future work?
Create a simple evidence habit
Keep accepted deliverables, change requests, invoices, project decisions and evidence of commercial risk. The goal is not to manufacture an Outside IR35 story. It is to preserve an accurate record of how the engagement operated.
Continue reading
IR35 essentials
Inside vs Outside IR35: five checks before you accept a contract
Read guideIR35 essentials
Status Determination Statements: what UK contractors should look for
Read guideEducational information only. This guide is not individual tax or legal advice. Status depends on the full facts and working practices of each engagement.