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authorize his returns to be filed on a quarter annual basis, with the return for January, February, and March of a given year being due by April 20 of such year; with the return for 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 with 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. Where the same person has more than one business registered with the Department under separate registrations SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468