“ Assessment where loss of tax discovered or determination of amount discovered to be incorrect 41(1) If an officer of Revenue and Customs discovers as regards an accounting period of a company that – (a) an amount which ought to have been assessed to tax has not been assessed, or (b) an assessment to tax is or has become insufficient, or (c) relief has been given which is or has become excessive; the officer may make an assessment (a “discovery assessment”) in the amount or further amount which ought in the officer’s opinion to be charged in order to make good to the Crown the loss of tax. . (2) If an officer of Revenue and Customs discovers that a company tax return delivered by a company for an accounting period incorrectly states – (a) an amount that affects, or may affect, the tax payable by that company for another accounting period, or (b) an amount that affects, or may affect, the tax liability of another company, the officer may make a determination (a “discovery determination”) of the amount which in the officer’s opinion ought to have been stated in the return. Restrictions on power to make discovery assessment or determination 42(1) The power to make – (a) a discovery assessment for an accounting period for which the company has delivered a company tax return, or (b) a discovery determination, is only exercisable in the circumstances specified in paragraph 43 or 44 and subject to paragraph 45 below. (2) Those restrictions do not apply to an assessment or determination which only gives effect to a discovery determination duly made with respect to an amount stated in another company’s company tax return. … (3) Any objection to a discovery assessment or determination on the ground that those paragraphs have not been complied with can only be made on an appeal against the assessment or determination. Fraudulent or negligent conduct 43. A discovery assessment for an accounting period for which the company has delivered a company tax return, or a discovery determination, may be made if the situation mentioned in paragraph 41(1) or (2) is attributable to fraudulent or negligent conduct on the part of – (a) the company, or (b) a person acting on behalf of the company, or (c) a person who was a partner of the company at the relevant time. Situation not disclosed by return or related documents etc. 44(1) A discovery assessment for an accounting period for which the company has delivered a company tax return, or a discovery determination, may be made if at the time when an officer of Revenue and Customs – (a) ceased to be entitled to give a notice of enquiry into the return, or (b) completed their enquiries into the return, they could not have been reasonably expected, on the basis of the information made available to them before that time, to be aware of the situation mentioned in paragraph 41(1) or (2). Return made in accordance with prevailing practice 45. No discovery assessment for an accounting period for which the company has delivered a company tax return, r discovery determination, may be made if – (a) the situation mentioned in paragraph 41(1) or (2) is attributable to a mistake in the return as to the basis on which the company’s liability ought to have been computed, and (b) the return was in fact made on the basis or in accordance with the practice generally prevailing at the time when it was made. General time limits for assessments 46(1) Subject to any provision of the Taxes Acts allowing a longer period in any particular class of case no assessment may be made more than six years after the end of the accounting period to which it relates. (2) Ina case involving fraud or negligence on the part of – (a) the company, or (b) a person acting on behalf of the company, or (c) a person who was a partner of the company at the relevant time. An assessment may be made up to 21 years after the end of the accounting period to which it relates. (3) Any objection to the making of an assessment on the ground that the time limit for making it has expired can only be made on an appeal against the assessment. Assessment to recover excessive group relief 76(1) If an officer of Revenue and Customs discovers that any group relief which has been given is or has become excessive, they may make an assessment to tax in the amount which in their opinion ought to be charged. (2) This power is without prejudice to – (a) the power to make a discovery assessment under paragraph 41(1): (b) the making of all such adjustments by way of discharge or repayment of tax or otherwise as may be required where a claimant company has obtained too much relief, or a surrendering company has forgone relief in respect of a corresponding amount. (3) if an assessment under this paragraph is made because a claimant company fails, or is unable, to amend its company tax return under paragraph 75(6), the assessment is not out of time if it is made within one year from – (a) the date on which the surrendering company gives notice of the withdrawal of consent, or (if later) sends a copy of a new notice of consent, to the claimant company under paragraph 75(3), or (b) the date on which an officer of Revenue and Customs sends the claimant company a copy of a notice containing their directions under paragraph 75(4).”
“(1) If the Inland Revenue discover that any group relief which has been given is or has become excessive, they may make an assessment to tax in the amount which in their opinion ought to be charged. (2) This power is without prejudice to – (a) the power to make a discovery assessment under paragraph 41(1) and (b) the making of all such adjustments by way of discharge or repayment of tax or otherwise as may be required where a claiming company has obtained too much relief, or a surrendering company has forgone relief in respect of a corresponding amount and they may have …”
“If the Inland Revenue discover ....”