"96. When it comes the imposition of a penalty, inaccuracy is not, in and of itself, enough. That is simply the act. There has to be more - namely, a mental element. The penalty regime is fault-based ('degrees of culpability'). The basic structure is to divide inaccuracies into 'careless' (less serious) and 'deliberate' (more serious). Unfortunately, the legislation does not provide any further guidance as to where the dividing line between the two classes of inaccuracy is to be found. It is an important line to draw, or to discern, since the penalties are levied with reference to that element. It is clear by inference that there must be some inaccuracies which are neither careless nor deliberate, and in connection with which no level of culpability can be fixed upon the taxpayer. 97. We consider that 'careless' for these purposes can be equated with 'negligent conduct' in the context of discovery assessments, which is to be judged with reference to the reasonable taxpayer, and what the (hypothetical) reasonable taxpayer, exercising reasonable diligence in the completion and submission of his return, would have done. Hence, careless does connote some fault, sufficient to attract censure when measured against an objective standard. 98. 'Deliberate' goes beyond that. In terms of inaccuracy, we consider it to mean 'done with a set purpose'. That purpose must be to produce an inaccuracy, within the meaning of Schedule 24. There is an element of intent in 'deliberate' which is not present in 'careless'. It represents a higher degree of fault. 99. We are reassured that reasoning is correct given that the draftsman of the Schedule provides that concealment aggravates deliberate conduct, but is not a factor at all in careless conduct."