(i) commercial transactions which are in the nature of professional services permitted to be rendered by an auditor or audit firm under the Act and the Chartered Accountants Act, 1949 (38 of 1949) and the rules or the regulations made under those Acts;
(ii) commercial transactions which are in the ordinary course of business of the company at arm's length price - like sale of products or services to the auditor, as customer, in the ordinary course of business, by companies engaged in the business of telecommunications, airlines, hospitals, hotels and such other similar businesses."
Extra Notes for Readers:
- Rule 51A was introduced by the Income Tax (9th Amendment) Rules, 2015, w.e.f. 24th June 2015
Reference/Source: Check at Income Tax site for latest version of the Rules - link