The County Assessor has until January 15th to certify the tax roll to the County Treasurer. Once the Treasurer has balanced the tax statement billing to the tax rolls from the Assessors Office, the Treasurer will certify the tax rolls for collection, generally in mid to late February. Tax Current year taxes are due in full on April 30th each year. Taxpayer's have the option of making two installment payments on taxes $50 and over. If half payments are exercised, the first half is due on or before April 30th and the second half is due on or before October 31st. 

The Mason County Treasurer's Office mails one property tax statement annually to the property owner of record after the taxes are certified for payment by the Treasurer this is generally in the February/March time frame. This statement includes coupons for the first and second half payments.