(1) The tax must be computed by multiplying the tax rate per gallon by the number of gallons of fuel subject to the fuel tax.
(2) A fuel distributor must remit tax on fuel purchased from a supplier, and due to the state for that reporting period, to the special fuel supplier. This provision does not apply to fuel imported by a distributor under RCW
82.38.035(3).
(3) At the election of the distributor, payment of the fuel tax owed on fuel purchased from a supplier must be remitted to the supplier on terms agreed upon between the distributor and the supplier or no later than seven business days before the twenty-sixth day of the following month. This election is subject to a condition that the distributor's remittances of all amounts of fuel tax due to the supplier must be paid by electronic funds transfer. The distributor's election may be terminated by the supplier if the distributor does not make timely payments to the supplier as required by this section.
(4) Except as provided in subsection (5) of this section, the tax return must be accompanied by a remittance payable to the state treasurer covering the tax amount due for the reporting period.
(5) If the tax is paid by electronic funds transfer, the tax must be paid on or before the twenty-sixth calendar day of the month immediately following the reporting period. If the payment due date falls on a Saturday, Sunday, or legal holiday the next business day is the payment date. If the tax is paid by electronic funds transfer and the reporting period ends on a day other than the last day of a calendar month, the tax must be paid on or before the last state business day of the thirty-day period following the end of the reporting period.
(6) The tax must be paid by electronic funds transfer whenever the amount due is fifty thousand dollars or more.