Comment by adam-a

As an employee earning £50k a year I would pay £12224 tax and NI, as a self employed person I would pay £11303 tax and NI. If I'm working for my own ltd I will pay £10871 as a combination of personal tax and corporation tax. The difference is not enormous. I think the IR35 stuff was to stop employers avoiding their NI contributions which is an extra £6155 tax on the £50k salary.