Indiana Code Title 6. Taxation § 6-6-1.1-201

Sec. 201. (a) A license tax is imposed on the use of all gasoline used in Indiana at the applicable rate specified in subsection (b), except as otherwise provided by this chapter.  The distributor shall initially pay the tax on the billed gallonage of all gasoline the distributor receives in this state, less any deductions authorized by this chapter.  The distributor shall then add the per gallon amount of tax to the selling price of each gallon of gasoline sold in this state and collected from the purchaser so that the ultimate consumer bears the burden of the tax.

(b) The license tax described in subsection (a) is imposed at the following applicable rate per gallon:

The rate shall be rounded to the nearest cent ($0.01).  After June 30, 2018, the new applicable rate may not exceed the rate in effect on June 30 plus one cent ($0.01).  However, the new rate may not be less than the rate in effect on June 30.  If the calculation of a new rate would produce a rate that is less than the rate in effect on June 30, the new rate shall be the rate in effect on June 30.  The department shall publish the rate that will take effect on July 1 on the department's website not later than June 1.