1. The Income-tax Officer may, for the purposes of this  Act, require any person whom he believes to be engaged in any business to which this Act applies, or to have been so engaged during any chargeable accounting period, or to be  otherwise liable to pay business profits tax, to furnish within such period, not being less than forty-five days from the date of the service of the notice, as may be specified in the notice, a return in the prescribed form and verified in the prescribed manner setting forth (along with such other particulars as may be provided for in the notice) with respect to any chargeable accounting period specified in the notice the profits of the business or the amount of deficiency, if any, available for relief under section 6:

Provided that the Income-tax Officer may, in his discretion, extend the date for the delivery of the return.

2. The Income-tax Officer may serve on any person, upon whom a notice has been served under sub-section (1), a notice requiring him on a date to be therein specified to produce, or cause to be produced, such accounts or documents as the Income-tax Officer may require, and may from time to time serve further notices in like manner requiring the production of such further accounts or documents or other evidence as he may require.