What are the circumstances under which assessment under section 147 i.e. income escaping assessment can be carried out?
If any income of an assessee has escaped assessment for any assessment year, the Assessing Officer may, subject to the new provisions of sections 148 to 153, assess or reassess such income and also any other income which has escaped assessment and which comes to his notice subsequently in the course of the proceedings, or recompute the loss or the depreciation allowance or any other allowance, as the case may be, for such assessment year.

It is imperative to note that once assessment or reassessment or re-computation has started, the Assessing Officer is empowered to assess or reassess the income which has escaped assessment and which comes to his notice subsequently in the course of the proceeding under this procedure notwithstanding that the procedure prescribed in new section 148A was not followed before issuing such notice for such income.