Why am I being investigated?
HMRC typically opens an enquiry because it has information that there's something wrong with your tax affairs.
What should I do if I'm due to be investigated?
Cooperate, and consider appointing a specialist to represent you.
How long will a tax investigation take?
This can range from one letter to several months, and in certain cases with more technical issues, years.
How far back can HMRC go?
In most cases, 6 years for carelessness, or for errors that have occurred despite reasonable care, 4 years.
Could I go to prison?
Most of HMRC's investigations are undertaken under their civil powers, which means that the decision has already been taken to work your case on a civil basis, with a view to a potential financial settlement.