| January 1 | Existing real and personal property is valued as of January 1 of the assessment year for taxes due and payable in the following tax year. (RCW 84.36.005 and RCW 84.40.020) |
| January * | Property taxes can be paid once the Treasurer has provided notification that the tax roll (based on last year's assessments) has been completed. (RCW 84.56.020) |
| April 30 | Taxes are due. If taxes are less than $50, full payment is due. If taxes are $50 or more, one half of the payment is due. Second half payment is due October 31. (RCW 84.56.020) |
| April 30 | Personal property listing due. Penalties apply. (RCW 84.40.020, 040, 060 and 130) |
| May 31 | End of revaluational cycle. (RCW 84.40.040) |
| July 1 | Valuation appeals to the Board of Equalization must be filed by today or within 30 days of notice of valuation. (RCW 84.40.038) |
| July 15 | Board of Equalization meets in open session. (RCW 84.48.010) |
| August 1 | Most taxing district boundaries must be established. (RCW 84.09.030) |
| August 31 | New construction placed on current assessment roll at the valuation assessed July 31. (RCW 36.21.070 through 36.21.090) |
| October 1 | Last day to file for exemption on historic property. (RCW 84.26.040) |
| October * | (First Monday in October) County begins budget hearings. (RCW 36.40.070) |
| October 31 | Second half property taxes due. (RCW 84.56.020) |
| November 30 | City and other taxing district budgets are due to the county. (RCW 84.52.020) |
| December 31 | Deadline for Current Use and Designated Forest Land applications. (RCW 84.33.130 and 84.34.030) |