I just noticed that HMRC have published a briefing paper within the last couple of days (see HMRC issue briefing: reform of off-payroll working rules - GOV.UK) which says a couple of interesting things:
So, in theory, a status determination of "inside" (when you've operated as "outside" previously) shouldn't result in an enquiry into earlier years. It doesn't say that they won't use that information if they happen to do a random enquiry though.
HMRC will launch an enhanced version of the CEST tool before the end of the year.
HMRC have taken the decision that they will only use information resulting from these changes to open a new enquiry into earlier years if there is reason to suspect fraud or criminal behaviour.
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