Well why use an umbrella company as you are using your own business ?
Fossy, Under the new ir35 rules brought in around 2020/2021 (for the private sector/earlier for pub sector) , it is the client that decides whether a particular ‘job’ is inside ir35 or outside ir35. If they decide it’s inside then you have no choice but to do it via an umbrella company, which is very inefficient from a tax perspective, but you have no choice. if it’s outside ir35 then you can do it the old way via a Ltd Co which is more tax efficient, but admin heavy, or via an umbrella, which is less tax efficient, but admin light. It’s the contractors choice if the job is outside ir35.
There’s no tax dodging going on using an umbrella, quite the opposite really.
Presume Dorset knob now has an inside ir35 gig hence the request for an umbrella company. I’ve used a few, they’re mostly fine, just make sure you get one that will treat pension contribs as salary sacrifice, otherwise you’ll be paying more employers ni than you need to.
It’s surprising how many umbrellas don’t treat pension contribs as salary sacrifice.