Your Texas registered agent, at a real street address

Yes. The Texas Secretary of State says "a domestic or foreign filing entity is required to continuously maintain a registered agent and registered office in Texas." Failing to do so "may result in the involuntary termination of a domestic filing entity or in the revocation of a foreign filing entity's registration" (Texas SOS registered agent FAQs). You name the agent in your certificate of formation; see forming a Texas LLC.

The agent receives official mail and lawsuits for your company and passes them on. Per the SOS, the duties are to receive and forward "any process, notice, or demand that is served on or received by the registered agent" to the company at the address it last provided, and to pass along notices required by law (Texas SOS). Missing one of these, such as a lawsuit served on an agent who has moved, can mean a default judgment you never saw coming.

An individual Texas resident, or an organization registered or authorized to do business in Texas with a business office at the registered office address. The SOS adds that an officer, owner or employee may serve, "an entity may not serve as its own registered agent," and the Secretary of State itself cannot serve. The agent must also consent to the appointment (Texas SOS).

The registered office "must be a physical address in Texas where the registered agent can be personally served with process during business hours," and cannot be only a mailbox service or answering service (Texas SOS formation FAQs).

Yes, if you are a Texas resident, but think about what it means. Your address goes on the public record, and you need to be reachable at that address during business hours so process can be served on you personally. Owners who work from home, travel, or live outside Texas often prefer a professional agent at a commercial address. Owners outside the U.S. need one; the SOS notes that service companies, and sometimes "your attorney or accountant," offer the service.

Because much of what reaches an agent is tax and state compliance mail, and here it lands on the desk of an Enrolled Agent. A franchise tax notice or a state letter is read by someone who knows what it means and can tell you what to do next. Foreign and out-of-state companies often pair the agent service with Texas registration and U.S. tax help. The office is a physical Texas street address on FM 1960 West, not a mailbox.

File a statement of change with the Secretary of State. The SOS points companies to Form 401 to update the registered agent or registered office, and says it is important to keep that information current (Texas SOS). The firm prepares the change, and your new agent's written consent is kept on file with your company records.