- 08October 8, 1950No events
- 09October 9, 1950No events
- 10October 10, 1950No events
- 11October 11, 1950No events
- 12October 12, 1950No events
- 13October 13, 1950No events
- 14October 14, 1950No 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.