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.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. Use this instruction for making, completing, or altering a written instrument, which is only one of the ways of committing forgery. Washington recognizes forgery as a Class C felony. Forgery is the crime where you falsely make a certain writing or possess a writing that you know is forged. Forgery is considered a felony conviction in the State of Washington under RCW 9A60.020, falling under the category of white-collar crimes. In Washington, being charged with forgery can mean paying heavy fines, possible jail time, and destruction of your record. (1) 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 or;. Forgery (RCW 9A.60.020).