(1) Except as indicated in subdivisions (b)(2) and (b)(3), gross receipts subject to sales tax and the sales price subject to use tax include the amount of any federal excise tax included in the prices of the property sold, even though the manufacturer or importer is also the retailer thereof, and it is immaterial whether or not the amount of such tax is stated as a separate charge.

(2) Prior to July 1, 1995, gross receipts subject to sales tax and the sales price subject to use tax do not include the amount of the federal excise tax imposed pursuant to section 4091 of the Internal Revenue Code with respect to diesel fuel or jet fuel for which the purchaser obtains either a direct refund or credit against his or her income tax.

(3) Beginning July 1, 1995, gross receipts subject to sales tax and the sales price subject to use tax do not include the federal excise tax imposed pursuant to Section 4081 or 4091 of the Internal Revenue Code with respect to gasoline, diesel, or jet fuel for which the purchaser obtains either a direct refund or credit against his or her income tax.

(1) In General--Installment Payments. When an article subject to a federal excise tax prior to the date such tax is repealed or reduced is sold under an agreement calling for payment of the sales price in installments, payments made on or after the repeal or reduction date will be considered as if they were made with respect to an article sold on or after the repeal or reduction date if the vendor establishes that the amount of payments due on or after such date were reduced by an amount equal to the tax reduction.

(2) Retailers' Excise Taxes Collected After Repeal. Amounts collected by a retailer as federal retailers' excise tax after the tax has been repealed, but neither paid by the retailer to the Internal Revenue Service nor refunded to its customers, constitute gross receipts subject to sales tax.

(1) Repayment by Manufacturer to Retailer. When a manufacturer receives a refund of federal excise tax and repays the amount of the tax to the retailer pursuant to requirements of federal law, the repayment to the retailer will be regarded for sales and use tax purposes as a reduction of the retailer's cost of goods sold.

(2) Repayment to Consumer. When a manufacturer receives a refund of federal manufacturers' excise tax and repays the amount of the tax to the consumer either directly or through the retailer pursuant to requirements of federal law, the repayment to the consumer will be regarded for sales and use tax purposes as a price adjustment. Taxable gross receipts of the retailer for the period in which the repayment is made to the consumer will be reduced accordingly, and sales tax previously paid by the retailer on the amount will be refunded to the retailer, provided the amount collected from the consumer as sales tax reimbursement is also refunded to him or her.

(3) Refunds on Gasoline, Diesel or Jet Fuel. The refund of the federal excise tax imposed by Section 4081 or 4091 of the Internal Revenue Code with respect to gasoline, diesel, or jet fuel (either by direct refund or as a credit against income tax) is an adjustment to the sales price of the gasoline, diesel, or jet fuel. Accordingly, the retailer who paid the sales tax or the purchaser who paid use tax measured by the sales price of the gasoline, diesel, or jet fuel may file with the board a claim for refund of tax measured by the amount of the federal excise tax so refunded or credited. The claim must be supported by proof of the exempt use of the gasoline, diesel or jet fuel and of the refund or credit of the federal excise tax to the purchaser.