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April, May and June of a given year being due by July 20 of such year; with the return for July, August and September of a given year being due by October 20 of such year, and with the return for October, November and December of a given year being due by January 20 of the following year. If the retailer is otherwise required to file a monthly or quarterly return and if the retailer's average monthly tax liability to the Department does not exceed $50, the Department may authorize his returns to be filed on an annual basis, with the return for a given year being due by January 20 of the following year. Such quarter annual and annual returns, as to form and substance, shall be subject to the same requirements as monthly returns. Notwithstanding any other provision in this Act concerning the time within which a retailer may file his return, in the case of any retailer who ceases to engage in a kind of business which makes him responsible for filing returns under this Act, such retailer shall file a final return under this Act with the Department not more than one month after discontinuing such business. In addition, with respect to motor vehicles, watercraft, aircraft, and trailers that are required to be registered with an agency of this State, except as otherwise provided in this Section, every retailer selling this kind of tangible personal property shall file, with the Department, upon a form to be SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468