- 13January 13, 1799No events
- 14January 14, 1799No events
- 15January 15, 1799No events
- 16January 16, 1799No events
- 17January 17, 1799No events
- 18January 18, 1799No events
- 19January 19, 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.