An agency relationship is irrevocable only when the agent holds a present ownership or security interest in the property or right at the center of the arrangement. Lawyers once called this an “agency coupled with an interest”; the modern Restatement calls it a “power given as security.” Outside that narrow exception, a principal can always end an agent’s authority, even when doing so breaks a contract.
The Default Rule Is Revocability
An agency exists when one person (the principal) authorizes another (the agent) to act on their behalf, and the agent agrees. Acts the agent takes within that authority bind the principal as if the principal had done them personally.1Legal Information Institute. Agency Because the relationship rests on the principal’s consent and control, the principal can ordinarily end it at will.
One distinction matters more than it looks. A principal always has the power to revoke an ordinary agency, but may not have the right to do so. If a contract promises the agent authority for a set period, an early revocation is still effective — the agent’s authority genuinely ends — but the principal may owe damages for breach. The agent likewise has the power to walk away at any time, though doing so may also create liability if it violates a contract.2USLegal. Duration and Termination of Agency
That gap between power and right closes only in one situation. When a power is given as security, the principal loses both.
Power Given as Security
Section 3.12 of the Restatement (Third) of Agency defines a power given as security as authority created for the benefit of the person holding it (or a third party), designed to protect a legal or equitable interest or to secure a duty the principal owes. The power must be granted when that duty or interest is created, or in exchange for consideration.3H2O Open Casebooks. Restatement of Agency (Third) Excerpts
The defining feature is that the authority exists to protect the agent’s own stake, not to serve the principal. Because the agent would suffer real financial harm if the principal could simply cancel the arrangement, the law removes the principal’s ability to do so. The power survives attempts to revoke it, and it survives the principal’s death or loss of mental capacity.2USLegal. Duration and Termination of Agency
What Counts as a Qualifying Interest
The agent’s interest must be a present, proprietary stake in the subject matter of the agency itself. Either legal title or equitable title to all or part of the property is sufficient.2USLegal. Duration and Termination of Agency Common qualifying arrangements include:
- A lien on the property. If you owe your agent money and grant authority over your property as security for that debt, the lien is a proprietary interest that makes the agency irrevocable.
- Co-ownership. When the agent owns a share of the property they’re authorized to manage or sell, that ownership stake qualifies.
- Security for a loan. A lender who receives authority over the borrower’s property to secure repayment holds a power given as security, and the borrower cannot revoke it while the debt is outstanding.
- A power of sale in a mortgage or deed of trust. The trustee’s authority to conduct a foreclosure sale on default is a classic irrevocable power, protected by the lender’s security interest in the property.
The common thread is that the agent’s interest exists independently of the agency. The agent would have a claim to the property, or a right against it, even if no agency had been created.
What Does Not Make an Agency Irrevocable
This is where most confusion lives, and where arrangements that feel permanent turn out not to be.
An agent’s expected commission or share of profits from exercising the agency does not qualify. A real estate agent has a financial stake in closing a sale — their livelihood may depend on it — but that stake sits in the compensation, not in the property. The U.S. Supreme Court drew this line in Hunt v. Rousmanier in 1823, and it still controls. The interest must be in the subject matter of the agency, not in the proceeds of exercising it.
A contract clause labeling the agency “irrevocable” does not make it so unless the agent also holds a qualifying proprietary interest. Courts look past the label to the substance. Without a genuine security interest or ownership stake, calling an agency irrevocable in a contract only means the principal will owe damages for revoking. The revocation itself still works.
Two other situations commonly mistaken for irrevocability:
- Money or effort invested. An agent who has spent significant time or resources on the principal’s business may have a breach-of-contract remedy, but those expenditures do not create a proprietary interest in the subject matter.
- Fixed-term agreements. An agency granted for a specific period is still revocable before it expires. The principal will be liable for breach, but the revocation is effective.
How an Irrevocable Agency Ends
Irrevocable does not mean permanent. A power given as security lasts only as long as the interest that supports it. Under Section 3.13 of the Restatement (Third), the power ends when:
- The underlying obligation is satisfied. Paying off the secured debt eliminates the interest and ends the power.
- The interest otherwise expires on its own terms, through a specific event or condition.
- Executing the power becomes illegal or impossible because of changed circumstances.
- The beneficiary voluntarily surrenders the power.
What does not end an irrevocable agency: the principal’s attempt to revoke it, the principal’s death if the secured duty survives death, or either party’s loss of mental capacity.4H2O Open Casebooks. Restatement of Agency (Third) Excerpts – Section: 3.13 The power can even pass to the agent’s estate on the agent’s death, unless the agent’s death itself extinguishes the underlying interest.2USLegal. Duration and Termination of Agency
Durable Powers of Attorney Are Not Irrevocable
A durable power of attorney is sometimes confused with an irrevocable agency, but the two serve opposite purposes. A durable power is designed to survive the principal’s incapacity so the agent can continue acting if the principal cannot manage their own affairs. That makes it resilient, not irrevocable. A competent principal can revoke a durable power of attorney at any time. The agent holds no proprietary interest in the principal’s property and acts purely on the principal’s behalf.
An irrevocable agency protects the agent’s own financial interest. A durable power of attorney protects the principal. That difference in purpose is why one cannot be revoked and the other can.