Washington Revised Code Title 82. Excise Taxes § 82.25.060. Invoice requirements--Rules--Liability

(1) The department may by rule establish the invoice detail required under RCW 82.25.030 for a distributor and for those invoices required to be provided to retailers under RCW 82.25.040.

(2) If a retailer fails to keep invoices as required under RCW 82.25.040, the retailer is liable for the tax owed on any uninvoiced vapor products but not penalties and interest, except as provided in subsection (3) of this section.

(3) If the department finds that the nonpayment of tax by the retailer was willful or if in the case of a second or plural nonpayment of tax by the retailer, penalties and interest must be assessed in accordance with chapter 82.32 RCW.