To answer the OP
If I were in a contract that I had believed to be 'outside' and my client declared that I was 'inside' I would be very concerned that, should I ever have to defend my outside decision, I was starting on the back foot. The fact that you've been in the contract a considerable time, means the liabilities are not insignificant. Whether HMRC will specifically target contractors in that situation is anyone's guess. If you haven't already got tax investigation insurance, then make sure you get it, and save any 'evidence' of your outside status.
You say CEST gives you an outside decision - get your client to agree with your answers, put their sig on it, and you should be good. But if that is the case, then it's bizarre to declare you inside - the client is obliged to take 'due care' with their determinations. Ask them how they came to that decision.
If I were in a contract that I had believed to be 'outside' and my client declared that I was 'inside' I would be very concerned that, should I ever have to defend my outside decision, I was starting on the back foot. The fact that you've been in the contract a considerable time, means the liabilities are not insignificant. Whether HMRC will specifically target contractors in that situation is anyone's guess. If you haven't already got tax investigation insurance, then make sure you get it, and save any 'evidence' of your outside status.
You say CEST gives you an outside decision - get your client to agree with your answers, put their sig on it, and you should be good. But if that is the case, then it's bizarre to declare you inside - the client is obliged to take 'due care' with their determinations. Ask them how they came to that decision.
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