“(2) an inaccuracy in a document given by [the taxpayer] to HMRC, which was neither careless nor deliberate on [the taxpayer’s] part when the document was given is to be treated as careless if [the taxpayer]: (a) discovered the inaccuracy at some later time, and (b) did not take reasonable steps to inform HMRC.”
“We reject Miss Bailey’s submission that the “no reason to believe” test is a subjective one. Paragraph 9(2)(a) of Schedule 24 requires the question to be asked: “At the time the disclosure was made, did the person making it have no reason to believe that HMRC had discovered or were about to discover the inaccuracy?”