Section 147 cannot be invoked for amendment with retrospective effect

It is clear that for invoking the proviso to section 147 beyond the period of four years, there must be failure on the part of the assessee to either make a return under section 139 or in response to a notice under section 147/148 or to disclose fully and truly all material facts necessary for the assessment for that assessment year. In so far as the filing of the return is concerned, that is not in dispute and, therefore, the focus is entirely on whether the assessee had failed to disclose fully and truly all material facts necessary for the assessment. The Tribunal, on an examination of the ...