Intimation of Loss [Section 157] :

When, in the course of the assessment of 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 section 72(1) or 73(2) or 74(1) or 74(3) or 74A(3), the Assessing Officer shall notify the assessee by an order in writing the amount of the loss as computed by him for this purpose.