Rule 23 : Intimation regarding subsequent changes in constitution, etc.
(Chapter: V - Registration of Firms)
If after the date of the application, or of the last application where more than one application are made, for registration of a firm for any assessment year and before the assessment for that assessment year is completed by the Assessing Officer, so far as known to the firm, any change or changes take place in the constitution of the firm or the shares of the partners, the details of such change or changes shall be communicated by the firm to the Assessing Officer as soon as possible after each such change takes place.
Reference/Source: Check at Income Tax site for latest version of the Rules - link
This page was last updated on 17th October 2016.