Complete a retirement application at least 5 weeks from the date you intend to retire(once you receive your official estimate). Public employees in Washington State can take comfort in the security of their retirement funds.Our Washington retirement tax friendliness calculator can help you estimate your tax burden in retirement using your Social Security, 401(k) and IRA income. Washington state recently passed legislation requiring employers to offer a retirement plan or enroll in the Washington Saves program. You are eligible to retire with a full benefit if you have at least five years of service credit when you meet the age requirement. Once vested, you are eligible to retire with a full benefit at age 65. Retirement before 65 is considered an early retirement. Employees may opt out. (1) A member eligible to retire under RCW 41.37.