“(1) If an officer of the Board or the Board discover, as regards any person (the taxpayer) and a year of assessment (a) that any income which ought to have been assessed to income tax, or chargeable gains which ought to have been assessed to capital gains tax, have not been so assessed, or (b) that an assessment to tax is or has become insufficient, or (c) that any relief which has been given is or has become excessive, the officer or, as the case may be, the Board may, subject to subsections (2) and (3) below, make an assessment in the amount, or the further amount, which ought in his or their opinion to be charged in order to make good to the Crown the loss of tax… …(3) Where the taxpayer has made and delivered a return under section 8 or 8A of this Act in respect of the relevant year of assessment, he shall not be assessed under subsection (1) above- (a) in respect of the year of assessment mentioned in that subsection; and (b) in the same capacity as that in which he made and delivered the return, unless one of the two conditions mentioned below is fulfilled. (4) The first condition is that the situation mentioned in subsection (1) above was brought about carelessly or deliberately by the taxpayer or a person acting on his behalf. (5) The second condition is that at the time when an officer of the Board- (a) ceased to be entitled to give notice of his intention to enquire into the taxpayer’s return under section 8 or 8A of this Act in respect of the relevant year of assessment; or (b) informed the taxpayer that he had completed his enquiries into that return, the officer could not have been reasonably expected, on the basis of the information available to him before that time, to be aware of the situation mentioned in subsection (1) above.”
“(1) In calculating the profits of a trade, no deduction is allowed for- (a) expenses not incurred wholly and exclusively for the purposes of the trade, or (b) losses not connected with or arising out of the trade. (2) If an expense is incurred for more than one purpose, this section does not prohibit a deduction for any identifiable part or identifiable proportion of the expense which is incurred wholly and exclusively for the purposes of the trade.”
“(1)a person may make a claim for trade loss relief against general income if the person- (a) carries on a trade in a tax year, and (b) makes a loss in the trade in the tax year (“the loss-making year”). (2) The claim is for the loss to be deducted in calculating the person’s net income- (a) for the loss-making year, (b) for the previous tax year, or (c) for both tax years.”
“(1) Trade loss relief against general income for a loss made in a trade in a tax year is not available unless the trade is commercial. (2) The trade is commercial if it is carried on throughout the basis period for the tax year- (a) on a commercial basis, and (b) with a view to the realisation of profits of the trade. (3) If at any time a trade is carried on so as to afford a reasonable expectation of profit, it is treated as carried on at that time with a view to the realisation of profits… (5) If there is a change in the basis period in the way in which the trade is carried on, the trade is treated as carried on throughout the basis period in the way in which it is carried on by the end of the basis period… (7) This section applies to professions and vocations as it applies to trades.”
“1(1) A penalty is payable by a person (P) where- (a) P gives HMRC a document of a kind listed in the Table below, and (b) Conditions 1 and 2 are satisfied. (2) Condition 1 is that the document contains an inaccuracy which amounts to or leads to- (a) an understatement of a liability to tax, (b) a false or inflated statement of a loss, or (c) a false or inflated claim to repayment of tax. (3) Condition 3 is that the inaccuracy was careless within the meaning of paragraph 3 or deliberate on P’s part.”