Washington state has two property tax relief programs for senior citizens and people with disabilities. Learn more about exemptions and deferrals for senior citizens, persons with disabilities, and disabled veterans.Find out how to qualify and apply. If you are a senior citizen or a person with disabilities with your residence in Washington State you may qualify for a property tax reduction. This brochure provides information for the property tax. This exemption must be renewed yearly. To apply online to go TaxRelief.kingcounty. Gov or fill out a paper application.