“We cannot explain the gaps in the sales invoices or the great number of credit notes but this is due to inexperienced staffs who have not been updating the system.”
“the power given to [HMRC]…is to make an estimate or an assessment to the best of their judgment on such information as is available to them. This necessarily allows [HMRC] a substantial margin of error. They are entitled to make what one might describe as an educated guess. They are not required to carry out exhaustive investigations….”
“The element of guesswork and the almost unavoidable inaccuracy in a properly made best of judgement assessment, as the cases have established, do not serve to displace the validity of the assessments, which are prima facie right and remain right until the taxpayer shows that they are wrong and also shows positively what corrections should be made in order to make the assessments right or more nearly right. It is also relevant, when considering the sufficiency of evidence to displace an assessment, to remember that the facts are peculiarly within the knowledge of the taxpayer.”