Overview of Texas Forgery Laws. Texas forgery law makes it a crime to forge a "writing" with intent to defraud or harm another person.Forging documents in Texas is a serious crime with severe penalties. Learn about Texas forgery laws, defenses, and possible penalties. The account holder MUST provide an Affidavit of Forgery before any criminal charges can be filed! An affidavit must accompany each forged or counterfeited item. A person commits an offense if he forges a writing with intent to defraud or harm another. I,. , certify that I am of sound mind, over the age of eighteen and fully capable of making this affidavit. Forgery in Texas are acts that involve altering writings in money or recorded information. Gain more insights from LegalMatch's law library.