Part IComputation of Profits

1The profits shall be taken to be the actual profits arising in the accounting period ; and the principle of computing profits by reference to any other year or an average of years shall not be followed.

2The principle of the Income Tax Acts under which deductions are not allowed for interest on money borrowed for the purpose of the trade or business, or for rent, or royalties, or for other payments income tax on which is .collected at the source, (not being payments of dividends or payments for the distribution of profits), and under which profits or gains arising from lands, tenements, or hereditaments forming part of the assets of the trade or business are excluded shall not be followed.

3Deductions for wear and tear or for any expenditure of a capital nature for renewals, or for the development of the trade or business or otherwise in respect of the trade or business, shall not be allowed except such as may be allowed under the Income Tax Acts, and if allowed shall be only of such amount as appears to the Commissioners of Inland Revenue to be reasonably and properly attributable to the year or accounting period.

4Deductions shall not be allowed on account of the liability to pay, or the payment of, income tax or excess profits duty, but a deduction shall be allowed (if not otherwise allowed by means of the adoption of the principle of the Income Tax Acts) for any sum which has been paid in respect of the profits on account of any excess profits duty or similar duty imposed in any country outside the United Kingdom.

5Any deduction allowed for the remuneration of directors, managers, and persons concerned in the management of the trade or business shall not", unless the Commissioners of Inland Revenue, owing to any special circumstances or to the fact that the remuneration of any managers or managing directors depends on the profits of the trade or business, otherwise direct, exceed the sums allowed for those purposes in the last prewar trade year or a proportionate part thereof as the case requires, and no deduction shall be allowed in respect of any transaction or operation of any nature, where it appears, or to the extent to which it appears, that the transaction or operation has artificially reduced the amount to be taken as the amount of the profits of the trade or business for the purposes of this Act.

6Where any company,- either in its own name or that of a nominee, owns the whole of the ordinary capital of any other company carrying on the same trade or business or so much of that capital as under the general law a single shareholder can legally own, the provisions of Part III of this Act as to excess profits duty and the pre-war standard of profits shall apply as if that other company were a branch of the first-named company, and the profits of the two companies shall not be separately assessed.

7Where in the case of any trade or business—

(a).the percentage standard is adopted as the pre-war standard of profits ; and

(b)the net result of the trade or business during the three last pre-war trade years has shown a loss ; and

(c)any part of the profits has been applied in extinction of that loss ;

then in estimating the profits, a deduction shall be allowed equal to the amount of profits so applied.

8In estimating the profits no account shall be taken of income received from investments except in the case of life assurance businesses and businesses where the principal business consists of the making of investments. Where account is taken of any such income—

(a)any variation in the value of any of those investments which appears to the Commissioners of Inland Revenue hot to be due to a variation in profits shall also be taken into account; and

(b)where the income has been derived from profits in respect of ' which any payment or repayment of excess profits duty has been made under this Act, such deduction or addition shall be made in computing the profits as will make proper allowance for that payment or repayment of duty.

9In computing the total profits of a local authority from any trades or businesses carried on by that authority the total amount- which is required to be raised by them, out of the rates or otherwise, for sinking fund purposes in connection with those trades or businesses shall be allowed as a deduction.

10In the case of societies registered under the Industrial and Provident Societies Acts the excess profits duty shall be charged on the sum by which the profits per member for the accounting period (including any surplus arising from transactions with members) exceed the like profits per member in, the pre-war trade year or average of years taken as the basis' of computation for the purpose of the pre-war standard of profits, multiplied by the number of members in the accounting period.

11In the case of any contract extending beyond one accounting period from the date of its commencement to the completion thereof and only partially performed in any accounting period there shall (unless the Commissioners of Inland Revenue, owing to any special circumstances, otherwise direct) be attributed to each of the accounting periods in which such contract was partially performed, such proportion of the entire profits or loss or estimated profits or loss in respect of the complete performance of the contract as shall be properly attributable to such accounting periods respectively, having regard to the extent to which the contract was performed in such periods.