FCBA. A federal law, passed as an amendment to Regulation Z, also known as the Truth in Lending Act. The FCBA is intended to protect consumers from credit card account billing errors or other unfair practices. The FCBA sets out specific guidelines that must be followed by both consumers and creditors, so a consumer must follow a specific procedure in order to be covered by this law (such as making a written dispute within sixty days of the error), and then the creditor becomes obligated to follow the guidelines set out for creditors.