Definition
A power of attorney or agency is said to be "coupled with an interest" when the agent or attorney holds a present, substantive interest in the property or subject matter upon which the power is to operate — not merely an interest in earning a fee or commission from exercising the power. This distinction matters because an ordinary agency or power of attorney is revocable at will by the principal and terminates automatically upon the principal's death or incapacity. A power coupled with an interest is irrevocable, surviving both revocation attempts and the principal's death, because the agent's rights are tied to property the agent already owns or has a legal stake in.
The classic example: a creditor given authority to sell a debtor's assets to satisfy a debt holds a power coupled with an interest in those assets. A real estate agent given authority to sell property in exchange for a commission does not — the agent's interest is only in the act of selling, not in the property itself.
Common Confusion
The phrase is frequently misread. "An interest" in this context does not mean an interest in exercising the power (i.e., standing to benefit financially from performance). It means a proprietary or security interest in the thing upon which the power operates. Courts and researchers have repeatedly had to clarify this distinction. An agent who earns a percentage of proceeds has an interest in the exercise of the power; an agent who holds a lien, ownership stake, or security interest in the underlying property has an interest in the property itself. Only the latter creates an irrevocable power. Conflating the two leads to incorrect conclusions about whether a principal can revoke a power of attorney or whether the power survives death.
Core Elements
For a power to qualify as coupled with an interest, courts generally require:
1. A valid power or authority granted by the principal to the agent.
2. A present interest in the property — not a future expectancy, not a contractual right to compensation, but an actual legal or equitable stake in the subject matter at the time the power is created.
3. The power and the interest must be created simultaneously and must be united in the same instrument or transaction. A separately acquired interest does not retroactively transform a pre-existing ordinary power into one coupled with an interest.
4. The interest must be in the property upon which the power is to operate, not merely in the proceeds or benefits flowing from its exercise.
Why It Matters in Research
This term appears most often in three research contexts: agency law (revocability of powers of attorney), secured transactions (creditor rights to dispose of collateral), and property law (authority to convey or encumber real property).
The critical research trap is temporal: the rule that a power coupled with an interest is irrevocable developed primarily through common law decisions in the eighteenth and nineteenth centuries, and historical sources — including Bouvier's — assume a common law framework that modern statutory regimes in many jurisdictions have partially displaced. The Uniform Power of Attorney Act and many state durable power of attorney statutes now allow powers to survive incapacity by explicit drafting, regardless of whether they are coupled with an interest. Researchers working with modern documents must distinguish between irrevocability grounded in the common law "coupled with an interest" doctrine and irrevocability achieved by statutory durable power provisions.
When working with older materials, watch for courts conflating "interest in the power" with "interest in the property." Pre-twentieth-century opinions are inconsistent on this point. The clarification that the interest must be in the property — not in the exercise — was settled more firmly in federal equity jurisprudence by the early 1900s, which is why Bouvier's cites a 1906 Supreme Court decision for the proposition.
In secured transactions research, this doctrine connects to the rights of a pledgee or lienholder to sell collateral after default. The UCC's Article 9 governs most of those situations today, but the underlying conceptual logic — that an interest in the collateral makes the agent's authority irrevocable — runs through both the common law doctrine and its statutory successors.
Corpus researchers should also note that the phrase appears in trust and estate instruments, particularly in powers of sale given to trustees who also hold beneficial interests. Whether such a trustee holds a "power coupled with an interest" in the technical sense affects what happens if the trust instrument is ambiguous about the scope of the power after the trustee's removal or death.
Historical Dictionary Support
Bouvier's entry is brief but precise, and its precision reflects a doctrinal correction rather than a simple definition. The entry specifically targets the common misreading — that "interest" means interest in the exercise of the power — and redirects to the correct meaning: interest in the property itself. This was not always the settled rule. Earlier treatise writers, including Story in his Commentaries on Agency, acknowledged that courts had reached conflicting results, and Bouvier's citation to a Supreme Court decision signals that the entry was written to resolve rather than merely describe the doctrine.
What Bouvier's does not address: the question of what happens when the interest is extinguished before the power is exercised, which courts have generally resolved by holding that the power becomes ordinary and revocable once the interest it was coupled with is satisfied or released. Historical dictionaries also do not engage with the statutory modifications now common across U.S. jurisdictions.
Jurisdictional Note
The common law doctrine is broadly recognized across U.S. jurisdictions and in English-derived legal systems, but its practical relevance has been narrowed by modern durable power of attorney statutes, which provide a simpler path to irrevocability. Some jurisdictions apply the coupled-with-an-interest doctrine strictly, requiring contemporaneous creation; others have relaxed this requirement by statute or case law. Researchers working in UCC Article 9 contexts will find the doctrine largely absorbed into secured party remedies frameworks.
Encyclopedia Cross-Reference
The Law Mind Property Law Encyclopedia: Future Interests — Executory Interests (Springing and Shifting) — relevant for understanding how present interests in property interact with future-oriented authority over that property.