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shall also refund, to the purchaser, the tax so collected from the purchaser. When filing his return for the period in which he refunds such tax to the purchaser, the serviceman may deduct the amount of the tax so refunded by him to the purchaser from any other Service Use Tax, Service Occupation Tax, retailers' occupation tax, or use tax which such serviceman may be required to pay or remit to the Department, as shown by such return, provided that the amount of the tax to be deducted shall previously have been remitted to the Department by such serviceman. If the serviceman shall not previously have remitted the amount of such tax to the Department, he shall be entitled to no deduction hereunder upon refunding such tax to the purchaser. Any serviceman filing a return hereunder shall also include the total tax upon the selling price of tangible personal property purchased for use by him as an incident to a sale of service, and such serviceman shall remit the amount of such tax to the Department when filing such return. If experience indicates such action to be practicable, the Department may prescribe and furnish a combination or joint return which will enable servicemen, who are required to file returns hereunder and also under the Service Occupation Tax Act, to furnish all the return information required by both Acts on the one form. Where the serviceman has more than one business registered with the Department under separate registration hereunder, SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468