" Construction of sections 59 to 70 (1) For the purpose of any provision of sections 59 to 70 which refers to a reasonable excuse for any conduct— ( a ) an insufficiency of funds to pay any VAT due is not a reasonable excuse; and ( b ) where reliance is placed on any other person to perform any task, neither the fact of that reliance nor any dilatoriness or inaccuracy on the part of the person relied upon is a reasonable excuse. (2) In relation to a prescribed accounting period, any reference in sections 59 to 69 to credit for input tax includes a reference to any sum which, in a return for that period, is claimed as a deduction from VAT due."
"… the cases in which a trader with insufficient funds to pay the tax can successfully invoke the defence of 'reasonable excuse' must be rare. That is because the scheme of collection which I have outlined involves at the outset the trader receiving (or at least being entitled to receive) from his customers the amount of tax which he must subsequently pay over to the commissioners. There is nothing in law to prevent him from mixing this money with the rest of the funds of his business and using it for normal business expenses (including the payment of input tax), and no doubt he has every commercial incentive to do so. The tax which he has collected represents, in substance, an interest-free loan from the commissioners. But by using it in his business he puts it at risk. If by doing so he loses it, and so cannot hand it over to the commissioners when the date of payment arrives, he will normally be … hard put to it to persuade the commissioners or the tribunal that he had a reasonable excuse for venturing and thus losing money destined for the Exchequer of which he was the temporary custodian."
"… if the exercise of reasonable foresight and of due diligence and a proper regard for the fact that the tax would become due on a particular date would not have avoided the insufficiency of funds which led to the default, then the taxpayer may well have a reasonable excuse for non-payment, but that excuse will be exhausted by the date on which such foresight, diligence and regard would have overcome the insufficiency of funds."