Discover intricacies of forgery laws in Washington State and learn about penalties, defenses, and legal guidance. If you're facing forgery.Use this instruction for making, completing, or altering a written instrument, which is only one of the ways of committing forgery. A person is guilty of forgery if, with intent to injure or defraud: (a) He or she falsely makes, completes, or alters a written instrument. Forgery is considered a felony in all 50 states and Washington is no exception. Use this instruction for possessing, offering or disposing of a forged instrument, which is only one of the ways of committing forgery. Washington recognizes forgery as a Class C felony. In Washington, being charged with forgery can mean paying heavy fines, possible jail time, and destruction of your record.