13. (1) The Excess Profits 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 excess profits tax, to furnish within such period, not being less than sixty 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 and the standard profits of the business as computed in accordance with the provisions of section 6 or the amount of deficiency available for relief under section 7: Provided that the Excess Profits Tax Officer may, in his discretion, extend the date for the delivery of the return. (2) The Excess Profits 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 document as the Excess Profits 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: Provided that the Excess Profits Tax Officer shall not require the production of any accounts relating to a period prior to the “previous year” as determined under section 2 of the Income tax Act, 1922, for the purpose of the income tax assessment for the year ending on the 31st day of March, 1937.