
What is IR35?
What Is IR35? We’ve broken down exactly what IR35 is for you with detailed information on how the rules apply to your working arrangement

What the off-payroll rules mean for an intermediary in the supply chain, and for the business at the end of it.
An intermediary and an end client sit in the same chain but carry different duties. The client decides status; the fee-payer operates PAYE on the result. Confusing the two is how liability ends up unowned.
From April 2026, unpaid PAYE can also move up the chain, which makes the distinction a commercial question rather than an administrative one.
Assess each engagement individually and with reasonable care, issue the statement in writing with reasons, and answer a challenge within 45 days.
Small companies are outside the off-payroll rules, but the underlying IR35 legislation still applies to the worker’s own intermediary — being out of scope of one is not being out of scope of the other.
Most of the difficulty is in the chain rather than in any single assessment. Mapping it is the work that makes everything else answerable.

Hannah Whitfield
heads compliance and IR35 advisory at Promultis
Hannah Whitfield has spent fifteen years on the compliance side of contract staffing, first inside a national recruiter and now leading the advisory team at Promultis. She writes and reviews the status determination processes that hiring firms rely on when HMRC asks how a decision was reached, and has guided clients through both the 2021 reform and the 2024 offsets. Her work covers umbrella and PEO engagements across construction, energy and technology. Hannah is a frequent speaker on supply chain liability and believes most compliance failures start as documentation failures.

What Is IR35? We’ve broken down exactly what IR35 is for you with detailed information on how the rules apply to your working arrangement

Inside or outside of IR35? Everything you need to know about being inside or outside, and what each status means for your take-home pay

How IR35 interacts with sole trader arrangements, and where the line sits between self-employment and deemed employment


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