Banks are generally required to ascertain the U.S. or non-U.S. tax status of their new individual (e.g. personal, sole proprietor) and entity (e.g. company, trust) customers at account opening. Banks may obtain this information by asking customers to complete specific U.S. tax forms (known as IRS Forms W-8 / W-9) or bespoke Self-Certification Forms3, and other supporting documentation as required (collectively, “FATCA documentation”).