- 08September 8, 1799No events
- 09September 9, 1799No events
- 10September 10, 1799No events
- 11September 11, 1799No events
- 12September 12, 1799No events
- 13September 13, 1799No events
- 14September 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.