Assessments to tax and determinations of loss, etc.
10(1)Where it appears to the Board that, in accordance with the provisions of this Part of this Act, an assessable profit has accrued to a participator in a chargeable period from an oil field, they shall make an assessment to tax on the participator and shall give him notice of the assessment.
(2)Where it appears to the Board that, in accordance with those provisions, an allowable loss has accrued to a participator in a chargeable period from an oil field, they shall make a determination that the loss is allowable to the participator and shall give him notice of the determination.
(3)Where it appears to the Board that, in accordance with those provisions, neither an assessable profit nor an allowable loss has accrued to a participator in a chargeable period, they shall make a determination to that effect and shall give him notice of the determination.
(4)A notice of assessment for a chargeable period shall state the amount of any allowable losses which, in accordance with those provisions, have been set against the assessable profit for that period.
(5)A notice of assessment or determination shall state that the participator may appeal against the assessment or determination in accordance with paragraph 14 below.
(6)After the service of the notice of assessment or the notice of determination the assessment or determination, as the case may be, shall not be altered except in accordance with the express provisions of this Part of this Act (including the provisions applied by paragraph 1 above).
11(1)Where a participator has under paragraph 2 above delivered to the Board a return for a chargeable period and the Board are satisfied that the information given in the return is correct in so far as it is material for the purpose of computing his assessable profit or allowable loss (if any) for that period, the Board shall (in so far as the computation falls to be made by reference to the matters dealt with in the return) make the assessment or determination under paragraph 10 above in accordance with the return.
(2)Where the Board are not so satisfied in relation to a participator's return or a participator fails to deliver to the Board a return for a chargeable period as required by paragraph 2 above, the Board shall, in so far as the computation of his assessable profit or allowable loss (if any) for that period falls to be made by reference to the matters which were dealt with in the return or, as the case may be, ought to have been dealt with in a return, make the assessment or determination under paragraph 10 above to the best of their judgment.
(3)Nothing in sub-paragraph (2) above or in paragraph 5 above shall be taken, in a case where the participator has delivered a return as to which the Board are not satisfied as mentioned in sub-paragraph (1) above, to prevent the Board from basing their assessment or determination on the participator's having had an interest in oil won and saved from the field different from that on which he based his return.
12(1)Where it appears to the Board—
(a)that the assessable profit charged to tax by or stated in an assessment ought to be or to have been larger or smaller; or
(b)that the allowable loss stated in an assessment or a determination of loss ought to be or to have been larger or smaller ; or
(c)that, where they made a determination that neither an assess able profit nor an allowable loss accrued in a chargeable period, they ought to have made an assessment to tax or a determination of loss for that period,
the Board may make such assessments or determinations or such amendments of assessments or determinations as may be necessary; and where the Board exercise any of their powers under this paragraph in relation to a chargeable period, they may make such adjustments in assessments or determinations for other chargeable periods as may be necessary in consequence of the exercise of those powers.
(2)Where under sub-paragraph (1) above it appears to the Board that the assessable profit for a chargeable period ought to have been larger and that the deficiency resulted from an excessive allowable loss accruing in a subsequent period having been set against the profit for that period, the Board may (notwithstanding anything in section 34 of the [1970 c. 9.] Taxes Management Act 1970 (ordinary time limit for assessments)) make a further assessment by virtue of sub-paragraph (1) above at any time not later than six years after the end of the chargeable period in which the allowable loss accrued.