Intimation of loss.

157. When, in the course of the assessment of the total income of any assessee, it is established that a loss has taken place which the assessee is entitled to have carried forward and set off under the provisions of sub-section (1) of section 72 , sub-section (2) of section 73 , sub-section (1) or sub-section (3) of section 74 or sub-section (3) of section 74A , the Assessing Officer shall notify to the assessee by an order in writing the amount of the loss as computed by him for the purposes of sub-section (1) of section 72 , sub-section (2) of section 73 , [sub-section (1) [or sub-section (3)] of section 74 or sub-section (3) of section 74A ].