In the great tradition of government-speak, HMRC and companies house have come up with the same acronym for different things, both of which can apply to the same small business.
PSC – According to HMRC
This means Personal Service Company. What is this?
This is usually a one-person company providing professional services to clients. Think IT contractor invoicing a bank for working on an IT project. Or marketing expert taken on to advise on expansion into a new area.