“Where a person – (a) has accounted to the Commissioners for VAT for a prescribed accounting period (whenever ended), and (b) in doing so, has brought into account as output tax an amount that was not output tax due, the Commissioners shall be liable to credit the person with that amount.” the Commissioners shall be liable to credit the person with that amount.”
“Where a person has for a prescribed accounting period (whenever ended) paid to the Commissioners an amount by way of VAT that was not VAT due to them, otherwise than as a result of – (a) an amount that was not output tax due being brought into account as output tax, or (b) an amount of input tax allowable under section 26 not being brought into account, the Commissioners shall be liable to repay to that person the amount so paid.” the Commissioners shall be liable to repay to that person the amount so paid.”
“Where a person has failed to make any returns required under this Act (or under any provision repealed by this Act) or to keep any documents and afford the facilities necessary to verify such returns or where it appears to the Commissioners that such returns are incomplete or incorrect, they may assess the amount of VAT due from him to the best of their judgment and notify it to him.”
“Where – (a) as a result of a claim under this section by virtue of section (1) or (1A) above an amount falls to be credited to a person, and (b) after setting any sums against it under or by virtue of this Act, some or all of that amount remains to his credit, the Commissioners shall be liable to pay (or repay) to him so much of that amount as so remains.”
“…in any case where – (a) an amount is due from the Commissioners to any person under any provision of this Act, and (b) that person is liable to pay a sum by way of VAT, penalty, interest or surcharge, the amount referred to in paragraph (a) above shall be set against the sum referred to in paragraph (b) above and, accordingly, to the extent of the set-off, the obligations of the Commissioners, and the person concerned, shall be discharged.”
“Where— (a) the Commissioners are liable to pay or repay any amount to any person under this Act, (b) that amount falls to be paid or repaid in consequence of a mistake previously made about whether or to what extent amounts were payable under this Act to or by that person, and (c) by reason of that mistake a liability of that person to pay a sum by way of VAT, penalty, interest or surcharge was not assessed, was not enforced or was not satisfied, any limitation on the time within which the Commissioners are entitled to take steps for recovering that sum shall be disregarded in determining whether that sum is required by subsection (3) above to be set against the amount mentioned in paragraph (a) above.”
“59. The purpose of section 81(3A) is, in my judgment, clear. It is that where a taxpayer makes a claim for repayment of VAT which has been paid owing to a mistake, all the consequences of the mistake are to be taken into account in assessing the quantum of his claim. That purpose is consistent with the overarching scheme of VAT under the Sixth Directive which treats the payment of output tax and the deduction of input tax as an “inseparable whole”
“The effect of time limits is to curtail the objects of the Directive but such curtailment is permissible. The effect of section 81(3A) is to modify the effect of otherwise absolute time limits in favour of the state. That modification must be done in a way which does not violate fundamental principles of Community law and is in conformity with the object of the Directive. If section 81(3A) permitted the state to pick and choose between out-of-time periods so that it could choose only those in which the amounts were due to HMRC for the purpose of the set-off the result would not conform to that object. Thus if possible section 83(1A) should be construed so as to require all the amounts which would be due to or from HMRC if time limitations were disregarded to be taken into account for the purposes of this setting off.”
“In an action to recover money, a set-off is a cross-claim for money by the defendant, for which he might sue the claimant. It has the effect of reducing or extinguishing the claimant’s claim by the amount of the cross-claim, so that he can only recover against the defendant the balance of his claim after deducting the amount owed by him to the defendant. Thus, if A sues B for£100 , while he owes B£75 , a set-off would have the effect of reducing A’s claim to£25 . The object of this is to prevent cross-actions.”