Real Estate Agency and Fiduciary Duties: A Complete Guide

Last updated: July 2026

What Is Agency in Real Estate?

An agency relationship is created when a principal (the client) authorizes an agent to act on their behalf. In real estate, the broker is the agent of record, and the sales agents who work under that broker carry out the agency on the broker’s behalf. The moment an agency relationship exists, the law requires the agent to place the client’s interests above their own and above everyone else’s — that is what makes agency different from simply providing a service.

Agency can be created expressly (a signed listing or buyer-representation agreement) or, in some situations, implied by conduct. Because agency creates powerful legal obligations, every state regulates when it begins, what it requires, and how it must be disclosed to consumers.

How an Agency Relationship Begins and Ends

Agency usually begins expressly — the client signs a written listing agreement (seller) or a buyer-representation agreement (buyer) naming the broker as their agent. It can also arise by implication, when an agent’s conduct leads a consumer to reasonably believe they are being represented — which is precisely why prompt agency disclosure matters.

An agency relationship ends when its purpose is fulfilled (the sale closes), the agreement expires, both parties mutually agree to end it, or one party revokes or renounces it (which can create liability if done without cause). The death, incapacity, or bankruptcy of either party also terminates the relationship.

The Fiduciary Duties: OLD CAR

Once an agent represents a client, they owe six core fiduciary duties, easiest to remember with the acronym OLD CAR:

• Obedience — follow the client’s lawful instructions.
• Loyalty — put the client’s interests ahead of your own.
• Disclosure — tell the client every material fact you know.
• Confidentiality — protect the client’s private information, even after closing.
• Accounting — handle and account for all money and documents accurately.
• Reasonable care — act with the skill and diligence expected of a competent agent.

These duties are owed to the client, not to the other party. For a deeper breakdown with examples, see our full guide to the fiduciary duties and how OLD CAR shapes agency relationships.

Types of Agency Relationships

Buyer’s Agent vs. Listing Agent

The same fiduciary duties apply on both sides of a deal, but the two roles serve opposite parties. A listing agent (seller’s agent) represents the seller — marketing the property, advising on price, and negotiating the highest and best terms for the seller. A buyer’s agent represents the buyer — finding suitable homes, advising on value, and negotiating the best price and terms for the buyer. Each owes the full OLD CAR duties to their own client, and only honesty and fair dealing to the other side. When one brokerage would otherwise represent both parties, states resolve the conflict through designated agency, a transaction-broker model, or — where permitted — disclosed dual agency.

Client vs. Customer: Who Gets Fiduciary Duties?

This distinction is central to agency law. A client (also called the principal) has entered a representation agreement and is owed the full OLD CAR fiduciary duties. A customer is a party the agent works with but does not represent — for example, a buyer who contacts the listing agent directly. Customers are still owed honesty, fair dealing, and the disclosure of known material defects, but not loyalty or confidentiality. Confusing the two is one of the most common causes of license complaints.

Agency Disclosure: When It Must Happen

Because consumers cannot see agency from the outside, nearly every state requires written agency disclosure — a form that explains who the agent represents. The timing varies, but disclosure is typically required at or before the first substantive discussion about a specific property, or before a listing or buyer-representation agreement is signed. Failing to disclose agency — or acting as an undisclosed dual agent — is a serious violation in every state — and, for Realtors, a breach of the NAR Code of Ethics.

How Agency Rules Differ by State

The core concepts are national, but each state names and structures agency differently. A few examples:

Frequently Asked Questions