> I set up a limited liability company that is just my own name. I then charge for services rendered and income goes into a company in my sole ownership. I then pay salary to the only employee (me). This is common and completely legal

This approach exploded fairly spectacularly in the UK for many of those deemed by the tax office (HMRC) to be using it purely as a device to attempt to avoid being "on payroll"

https://www.gov.uk/guidance/understanding-off-payroll-workin...

Even BBC presenters were setting up "personal service companies" to try and avoid taxes (allegedly at the urging of the BBC) and ended up owing the tax office a bunch of back taxes.