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the lessor from the lease of those trailers during the same reporting period shall be reported and tax shall be paid on a single return form to be prescribed by the Department. Refunds made by the seller during the preceding return period to purchasers, on account of tangible personal property returned to the seller, shall be allowed as a deduction under subdivision 5 of his monthly or quarterly return, as the case may be, in case the seller had theretofore included the receipts from the sale of such tangible personal property in a return filed by him and had paid the tax imposed by this Act with respect to such receipts. Where the seller is a corporation, the return filed on behalf of such corporation shall be signed by the president, vice-president, secretary, or treasurer or by the properly accredited agent of such corporation. Where the seller is a limited liability company, the return filed on behalf of the limited liability company shall be signed by a manager, member, or properly accredited agent of the limited liability company. Except as provided in this Section, the retailer filing the return under this Section shall, at the time of filing such return, pay to the Department the amount of tax imposed by this Act less a discount of 2.1% prior to January 1, 1990 and 1.75% on and after January 1, 1990, or $5 per calendar year, whichever is greater, which is allowed to reimburse the retailer for the expenses incurred in keeping records, SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468