Just in case anyone is reading this later: IR35 isn't actually as simple as that, and whether you charge fixed price or T&M is likely to be a relatively minor d

Just in case anyone is reading this later: IR35 isn't actually as simple as that, and whether you charge fixed price or T&M is likely to be a relatively minor detail in whether you are considered a disguised employee. The "doing whatever is asked of them" in the parent comment would be a bigger indicator that someone isn't truly independent and is instead operating under direction and control like an employee.