A Texas Assumed Name Certificate for an Unincorporated Business or Profession is a legal document filed with the Texas Secretary of State that is used to register a business name different from the official business owners' legal name. This document is also known as a DBA (Doing Business As) or fictitious name certificate and gives the business owner the authority to conduct business under the assumed name. There are two types of Texas Assumed Name Certificates: Short Form and Long Form. The Short Form Certificate is used to register a business name with the Texas Secretary of State and requires the business owner to provide the assumed name, their legal name, a mailing address, and a signature. The Long Form Certificate is used to register a business name with the Texas Secretary of State and requires the business owner to provide the assumed name, the business owner's legal name, a mailing address, contact information, and a signature.