Assessment    after partition of a Hindu undivided family.
20.    (1) Where, at the time of making an assessment, it is brought to the notice of    the [Assessing Officer] that a partition has taken place among the members of    a Hindu undivided family, and the [Assessing Officer], after inquiry, is    satisfied that the joint family property has been partitioned as a whole among    the various members or group of members in definite portions, he shall record    an order to that effect and shall make assessment on the net wealth of the    undivided family as such for the assessment year or years, including the year    relevant to the previous year in which the partition has taken place, if the    partition has taken place on the last day of the previous year and each member    or group of members shall be liable jointly and severally for the tax assessed    on the net wealth of the joint family as such.
(2)    Where the [Assessing Officer] is not so satisfied, he may, by order, declare    that such family shall be deemed for the purposes of this Act to continue to    be a Hindu undivided family liable to be assessed as such.