(a) Except as provided in subsection (b), at the time of filing each monthly report, each distributor shall pay to the administrator the full amount of tax due under this chapter for the preceding calendar month, computed as follows:

1. (1) Enter the total number of invoiced gallons of gasoline received during the preceding calendar month.
2. (2) Subtract the number of gallons for which deductions are provided by sections 701 through 705 of this chapter from the number of gallons entered under subdivision (1).
3. (3) Subtract the number of gallons reported under section 501(3) of this chapter.
4. (4) Multiply the number of invoiced gallons remaining after making the computation in subdivisions (2) and (3) by the tax rate prescribed by section 201 of this chapter to compute that part of the gasoline tax to be deposited in the highway, road, and street fund under section 802(2) of this chapter or in the motor fuel tax fund under section 802(3) of this chapter.
5. (5) Multiply the number of gallons subtracted under subdivision
6. (3) by the tax rate prescribed by section 201 of this chapter to compute that part of the gasoline tax to be deposited in the fish and wildlife fund under section 802(1) of this chapter.

(b) If the department determines that a distributor's:

1. (1) estimated monthly gasoline tax liability for the current year; or

2. (2) average monthly gasoline tax liability for the preceding year;

   exceeds five thousand dollars ($5,000), the distributor shall pay the monthly gasoline taxes due by electronic fund transfer (as defined in IC 4-8.1-2-7 ) or by delivering in person or by overnight courier a payment by cashier's check, certified check, or money order to the department. The transfer or payment shall be made on or before the date the tax is due.

   As added by Acts 1979, P.L.79, SEC.1. Amended by Acts 1980, P.L.51, SEC.24; Acts 1980, P.L.10, SEC.8; Acts 1981, P.L.93, SEC.1; P.L.59-1985, SEC.11; P.L.92-1987, SEC.5; P.L.63-1988, SEC.12; P.L.28-1997, SEC.22; P.L.211-2007, SEC.35.