- 14January 14, 1849No events
- 15January 15, 1849No events
- 16January 16, 1849No events
- 17January 17, 1849No events
- 18January 18, 1849No events
- 19January 19, 1849No events
- 20January 20, 1849No 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.