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is filed, but only if the Department's decision to revoke the certificate of registration has become final. A retailer need not remit that part of any tax collected by him to the extent that he is required to remit and does remit the tax imposed by the Retailers' Occupation Tax Act, with respect to the sale of the same property. Where such tangible personal property is sold under a conditional sales contract, or under any other form of sale wherein the payment of the principal sum, or a part thereof, is extended beyond the close of the period for which the return is filed, the retailer, in collecting the tax (except as to motor vehicles, watercraft, aircraft, and trailers that are required to be registered with an agency of this State), may collect for each tax return period only the tax applicable to that part of the selling price actually received during such tax return period. In the case of leases, except as otherwise provided in this Act, the lessor, in collecting the tax, may collect for each tax return period only the tax applicable to that part of the selling price actually received during such tax return period. Except as provided in this Section, on or before the twentieth day of each calendar month, such retailer shall file a return for the preceding calendar month. Such return shall be filed on forms prescribed by the Department and shall furnish such information as the Department may reasonably SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468