- 19December 19, 1948No events
- 20December 20, 1948No events
- 21December 21, 1948No events
- 22December 22, 1948No events
- 23December 23, 1948No events
- 24December 24, 1948No events
- 25December 25, 1948No 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.