- 18November 18, 1979No events
- 19November 19, 1979No events
- 20November 20, 1979No events
- 21November 21, 1979No events
- 22November 22, 1979No events
- 23November 23, 1979No events
- 24November 24, 1979No 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.