Sec. 705. (a) If a monthly report is filed and the amount due is remitted at or before the time required by this chapter, a distributor is entitled to a deduction equal to one and six-tenths percent (1.6%) of the remainder of:
(1) the number of invoiced gallons of gasoline he received in Indiana during the preceding calendar month; minus
(2) the deductions claimed by the distributor under sections 701 through 704 of this chapter.
This deduction is a flat allowance to cover evaporation, shrinkage, losses (except losses covered by section 301(5) of this chapter), and the distributor's expenses in collecting and timely remitting the tax imposed by this chapter.
(b) If a monthly report is filed or the amount due is remitted later than the time required under this chapter, the distributor shall pay to the administrator all of the gasoline tax the distributor received from the sale of gasoline covered by the late report, reduced by payments made under IC 6-8.1-8-1.