The Washington State Legislature has changed the Senior/Disabled property tax exemption program by increasing the maximum annual household income from $35,000 to $40,000. This change is not retroactive, it applies to property taxes due in 2016 and forward only.
You may qualify for property tax relief in 2016, if by December 31, 2015: You are age 61 or older, or you are unable to be gainfully employed because of physical or mental impairment, and you own and occupy a residence or mobile home, and have a gross household income of $40,000 or less.
For more information please contact your county assessor. Pierce County has released a great video on the exemption.