- 26December 26, 1858No events
- 27December 27, 1858No events
- 28December 28, 1858No events
- 29December 29, 1858No events
- 30December 30, 1858No events
- 31December 31, 1858No events
- 01January 1, 1859No 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.