IR35 guides
Everything we know about IR35, written in plain English. No jargon, no sales pitch, and updated when the rules change.
Fundamentals
What is IR35? The UK rules explained in plain English
IR35 targets disguised employment through limited companies. How the rules work, who they affect, and what inside vs outside means for your pay.
Assessment
IR35 checker: how to check your IR35 status
Use HMRC's CEST tool or our free IR35 checklist. The three key tests, what your result means, and what to do next.
Who it affects
Who IR35 applies to: contractors, sole traders and umbrella workers
IR35 catches one structure and leaves others alone. Find out exactly where you sit before you sign a contract.
Run the numbers
See what you would actually take home.
Enter your day rate once and compare inside and outside IR35 side by side. Free, no signup.