Forgery is considered a felony in all 50 states and Washington is no exception. 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 class C felony in the State of Washington. A person commits the crime of forgery when, with intent to injure or defraud, he or she falsely makes, completes, or alters a written instrument. Forgery is illegal if someone falsely signs for another for illegal purposes - in WA, the element is "with intent to injure or defraud". In Washington, being charged with forgery can mean paying heavy fines, possible jail time, and destruction of your record.