Both myself and my wife contract through the same Limited company, and have done for +10 years. While most of her contracts have been through agencies, mine are usually direct.
Her current contract is with the Public Sector, thru an agency - so there is concern that they'll from April pay her PAYE. But if she was working for a Professional Services firm (as a contractor) I'm pretty sure they'd be paid the day rate, and then pay her her day rate.
So how many people do we need working for us to be classed as a business, and paid a day rate?
Or is it a too simple view?