- 08December 8, 1799No events
- 09December 9, 1799No events
- 10December 10, 1799No events
- 11December 11, 1799No events
- 12December 12, 1799No events
- 13December 13, 1799No events
- 14December 14, 1799No events
A=ANNUAL
M=MONTHLY
Q=QUARTERLY
DISCLAIMER: THESE DUE DATES ARE SUBJECT TO CHANGE. WE WILL DO OUR BEST TO KEEP THIS CALENDAR UP TO DATE WITH THE EVERCHANGING DEADLINES. ANY STATE FILING DUE DATES ARE IN REFERENCE SPECIFICALLY TO THE WASHINGTON STATE DEPARTMENT OF REVENUE.