“(1) Subject [to a provision irrelevant to this case] if, by the last day on which a taxable person is required in accordance with regulations under this Act to furnish a return for a prescribed accounting period- (a) The Commissioners have not received that return, or (b) The Commissioners have received that return but have not received the amount of VAT shown on the return as payable by him in respect of that period, then that person shall be regarded for the purposes of this section as being in default in respect of that period… (2) Subject to [irrelevant provisions], subsection (4) below applies in any case where- (a) a taxable person is in default in respect of a prescribed accounting period, and (b) the Commissioners serve notice on the taxable person (a “surcharge liability notice”) specifying as a surcharge period from the purposes of this section as period ending ion the first anniversary of the last day of the period referred to in paragraph (a) above and beginning, subject to subsection (3) below, on the date of the notice… (3) If a surcharge liability notice is served by reason of a default in respect of a prescribed accounting period and that period ends before the expiry of an existing surcharge period already notified to the taxable person concerned, the surcharge period specified in that notice shall be expressed as a continuation of the existing surcharge period and, accordingly, for the purposes of this section, that existing period and its extension shall be regarded as a single surcharge period. (4) Subject to subsections (7) to (10) below, if a taxable person on whom a surcharge liability notice has been served- (a) is in default in respect of a prescribed accounting period ending within the surcharge period specified in (or extended by) that notice, and (b) has outstanding VAT for that prescribed accounting period, he shall be liable to a surcharge equal to whichever is the greater of the following, namely, the specified percentage of his outstanding VAT fro that period and£30 . [(5) sets the “specified percentage at 2%,5%,10%, or 15% according as the relevant default is the first, second, or third , or fourth or subsequent default in the surcharge period in relation to which VAT was paid late.] [(6) defines the “outstanding VAT – on which the penalty is calculated by the application of the relevant percentage – ass the VAT due for the period which has not been paid on time.] (7) If a person who, apart form this subsection, would be liable to a surcharge under subsection (4) above satisfies the Commissioners, or on appeal , a tribunal, that in the case of a default which is material to a surcharge- (a) the return or as the case may be the VAT shown on the return was despatched at such a time and in such a manner that it was reasonable to expect that it would be received by the Commissioners within the appropriate time limit, or (b) there is a reasonable excuse for the return or the VAT not having been so despatched, he shall not be liable to the surcharge…”
“We note that in Enersys the conclusion that the default surcharge in that case was “wholly disproportionate to the gravity of the offence” (paragraph 69) shows that the Tribunal considered, as we do, that in deciding whether a penalty is disproportionate it is necessary to do what the default surcharge regime does not, which is to consider: The “gravity of the default: in particular to what extent the taxpayer was at fault; How long the VAT was outstanding; The amount of the surcharge relative to the wealth of the defaulter”