‘....an assessment to income tax....may be made at any time not more than 4 years after the end of the year of assessment to which it relates’
“... the wording of section 50(6) and (7), which applies alike to appeals relating to self-assessments and appeals against assessments made by an officer of HMRC, reflects similar wording of very long standing which goes back long before the introduction of self-assessment. There is a venerable principle of tax law to the general effect that there is a public interest in taxpayers paying the correct amount of tax, and it is one of the duties of the Commissioners in exercise of their statutory functions to have regard to that public interest.”
‘[counsel for the appellant said] that [s 50(6) TMA] meant that the commissioners could reduce the assessment before them if they were satisfied that the taxpayer company had been overcharged on some other occasion, in this case the 1979 and 1980 assessments. But that is not how I read the section. It says that if the appellant is overcharged by any assessment the assessment shall be reduced accordingly. In my judgment, the only assessment that can be reduced is the assessment in respect of which the commissioners think that the taxpayer has been overcharged. As I have said, it was no longer open to the commissioners to reduce the 1979 or 1980 assessments. In any event, there was no appeal against those assessments before them. They were not entitled on account of their views about those assessments to reduce the assessment against which the appeal had actually been brought. The result is that in my judgment the commissioners thereby erred in law and the appeal must be allowed.’