If you've come here looking for advice regarding umbrella companies here it is.
Choose a company that complies with HMRC guidelines and current UK legislation*.
You can find a selection here: Ask an Umbrella Company - All Umbrella Companies Are Equal
Some companies will offer you the moon on a stick, or 85%+ of your day rate. It sounds too good to be true, doesn't it?
That's because it is.
Have a read of this: Don't be fooled by imposter umbrella companies
Because if you join them you will very likely end up here HMRC Scheme Enquiries
And for newbies, definitely don't join a company with offices in the Isle of Man or Jersey.
(*When an umbrella states that they are 'Fully HMRC compliant', ask them what they mean by this - do they mean that they comply with HMRC guidelines? HMRC do not offer compliance reviews and will not 'approve' umbrella companies. Basically they say this just to get you to sign up.)