(5)Where a finding of total or partial partition has been recorded by the [Assessing Officer ] [ Substituted by Act 4 of 1988, Section 2, for " Income-tax Officer" (w.e.f. 1.4.1988).]under this section, and the partition took place after the expiry of the previous year, the total income of the previous year of the joint family shall be assessed as if no partition had taken place; and the provisions of clause (b) of sub-section (4) shall, so far as may be, apply to the case.