First half or full payment of real estate taxes is due April 30, second half taxes are due by October 31.
When paying by mail, payments must be postmarked no later than the due date or the taxes become delinquent.
Delinquent / Late Penalties
Delinquent / late payment of taxes are subject to interest at the rate of 12% per year (1% for each month of delinquency) from the month of delinquency until paid.
If the first half tax is not paid by April 30, the full amount becomes delinquent.
In addition all delinquent taxes are subject to penalties as follows:
A penalty of 3% shall be assessed on the amount of tax delinquent on June 1 of the year in which the tax is due.
An additional 8% shall be assessed on the total amount of tax delinquent on December 1 of the year in which the tax is due.
Full or first half tax must be paid by April 30th or entire tax becomes due, delinquent and subject to seizure and additional costs.
Please consult RCW 84.56.020 as the authoritative source of the above summary.