Reports and statements for purpose of auditing retaliatory and privilege tax returns. (1) For the purpose of enabling the Director to audit the retaliatory and privilege tax calculation of a company liable for such tax under the provisions of Sections 409, 444 and 444.1, every such company, in addition to all other statements and reports required by law, shall file a report in writing with the Director not later than March 1 of each year, in the form prescribed by the Director, signed and sworn to by its president, vice president, secretary, treasurer or manager.
     (2) In every such return the reporting of premiums for tax purposes shall be on a written basis or on a paid for basis, consistent with the basis required by the annual statement of the insurer filed with the Director pursuant to Section 136.
     (3) The Director may require at any time verified supplemental statements with reference to any matter pertinent to the proper calculation of the tax.