- 09December 9, 1798No events
- 10December 10, 1798No events
- 11December 11, 1798No events
- 12December 12, 1798No events
- 13December 13, 1798No events
- 14December 14, 1798No events
- 15December 15, 1798No 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.