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When was the last time you worked for them? All of the agencies I work for just stopped working with anyone that wasn't Ltd or working via an umbrella just tobprotect themselves so check whether they've changed their policy. If they haven't then this might just be them knowing the job falls within ir35 for typical freelancers and sending you the message.
Just because you've worked with them before don't assume they remember anything about your business set up.
I'm a sole trader and being asked if I can do inside IR35 for a project.
My understanding was that IR35 was relevant to freelancers working through their own ltd company. They know I'm a sole trader, not working through ltd. Why are they asking this? Is it something I've missed or something they've forgotten?
I work for lots of different clients. Usually a few days at a time. This would be 12 days for one client.