- 19April 19, 1970No events
- 20April 20, 1970No events
- 21April 21, 1970No events
- 22April 22, 1970No events
- 23April 23, 1970No events
- 24April 24, 1970No events
- 25April 25, 1970No 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.