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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 serviceman is otherwise required to file a monthly or quarterly return and if the serviceman'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 serviceman may file his return, in the case of any serviceman who ceases to engage in a kind of business which makes him responsible for filing returns under this Act, such serviceman shall file a final return under this Act with the Department not more than one month after discontinuing such business. Where a serviceman collects the tax with respect to the selling price of property which he sells and the purchaser thereafter returns such property and the serviceman refunds the selling price thereof to the purchaser, such serviceman SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468