"The test of whether or not there is a reasonable excuse is an objective one. In my judgment it is an objective test in this sense. One must ask oneself: was what the taxpayer did a reasonable thing for a responsible trader conscious of and intending to comply with his obligations regarding tax, but having the experience and other relevant attributes of the taxpayer and placed in the situation that the taxpayer found himself at the relevant time, a reasonable thing to do?" (2) Although the Clean Car case was a VAT case, it is generally accepted that the same principles apply to a claim of reasonable excuse in direct tax cases. (3) Indeed, in the First-tier Tribunal case of Nigel Barrett[2015] UKFTT 329 (a case on late filing penalties under the CIS) Judge Berner said: "
"I find that it is most likely that, if the Commissioners had had regard to paragraph (iii) of the conclusion to Mr Ross' report, their concern for the protection of the revenue would probably have been fortified."
"The court is entitled to investigate the action of the local authority with a view to seeing whether they have taken into account matters which they ought not to take into account, or, conversely, have refused to take into account or neglected to take into account matters which they ought to take into account. Once that question is answered in favour of the local authority, it may be still possible to say that, although the local authority have kept within the four corners of the matters which they ought to consider, they have nevertheless come to a conclusion so unreasonable that no reasonable authority could ever have come to it." (i) As Lady Hale said, in Braganza v BP Shipping[2015] UKSC 17 at [24], this test has two limbs: "
“It would in my opinion be a very strange use of language to describe the respondent’s [i.e. Mr Winder] behaviour in relation to this litigation as an abuse or misuse by him of the process of the court. He did not select the procedure to be adopted. He is merely seeking to defend proceedings brought against him by the appellants [Wandsworth BC]. In so doing he is seeking only to exercise the ordinary right of any individual to defend an action against him on the ground that he is not liable for the whole sum claimed by the plaintiff. Moreover he puts forward his defence as a matter of right, whereas in an application for judicial review, success would require an exercise of the court's discretion in his favour. Apart from the provisions of Order 53 andsection 31 of the Supreme Court Act 1981 , he would certainly be entitled to defend the action on the ground that the plaintiff's [i.e. Wandsworth BC] claim arises from a resolution which (on his view) is invalid..... I find it impossible to accept that the right to challenge the decision of a local authority in course of defending an action for non-payment can have been swept away by Order 53, which was directed to introducing a procedural reform….. Nor, in my opinion, didsection 31 of the Supreme Court Act 1981 which refers only to “an application” for judicial review have the effect of limiting the rights of a defendant sub silentio. I would adopt the words of Viscount Simonds in Pyx Granite Co. Ltd v. Ministry of Housing and Local Government [1960] A.C. 260, 286 as follows: “It is a principle not by any means to be whittled down that the subject's recourse to Her Majesty's courts for the determination of his rights is not to be excluded except by clear words". The argument of the appellants [i.e. Wandsworth BC] in the present case would be directly in conflict with that observation. If the public interest requires that persons should not be entitled to defend actions brought against them by public authorities, where the defence rests on a challenge to a decision by the public authority, then it is for Parliament to change the law.”
“I fully appreciate that public authorities may be exposed to great inconvenience if they are unable to invoke the principle of O’Reilly v Mackman[1983] 2 AC 237 in a case such as the present. But such inconvenience may arise in many cases where a citizen successfully challenges action by public authority affecting his private law rights under a decision by the public authority which proves to have been made ultra vires. The successful challenge by the citizen may be a source of great embarrassment for the public authority, as it contemplates all the earlier occasions upon which it has given effect to the ultra vires decision and the possibly immense cost to ratepayers of putting the matter right. Sometimes indeed, as experience has shown, it may even be necessary to legislate in order to extricate the public authority from its difficulties. But it does not in my judgment follow that there is an abuse of process by the citizen in invoking the assistance of the ordinary courts, by action or by defence, in order to enforce, or to claim the protection of, his private law rights. If it is thought that any limit should be placed upon citizens proceeding in this way, in the interests of good administration, then this is, in my judgment, a matter for Parliament.”