Penalties: A penalty of two percent per month will be assessed on the outstanding balance for any payments postmarked after the 20th day of the month following the month of sale. When the 20th day of the month falls on a Saturday, Sunday, or a legal holiday, the filing must be postmarked by the U.S. Postal Service no later than the next postal business day. Absent a postmark, the date received at the LCB or authorized designee, will be used to assess the penalty of two percent per month on the outstanding balance after the 20th day of the month following the month of sale.
Wash. Admin. Code § 314-55-092