As per Sec.224(1) of The Companies Act,1956 it is mandatory for the company to inform to Auditor about his appointment within 7 days of AGM in which he has been appointed and Auditor has to file form 23B within 30 days from receipt of this information.
Till now no one was following this strictly but after introduction of new Form 23AC w.e.f. 28.9.2008, Form 23B has to be filed before filing Form 23AC since SRN no. form 23B has to be mandatorily mentioned in Form 23AC.
Intimation letter received from company is to be attached with Form 23B.
There is no fee for filing Form 23B with MCA