Definition
A special power is an authority conferred on a person to act in a defined, limited capacity — restricted either to specific acts, specific subject matter, or specific parties — as opposed to a general power, which grants broad or unrestricted authority. The term appears in two principal legal contexts:
1. Agency and property law. A special power of attorney or special agency authorizes the agent or attorney-in-fact to perform only the particular acts specified in the instrument conferring the power. It does not extend to related transactions, even those a reasonable person might assume are included. A person authorized under a special power to sell a specific parcel of real estate, for example, has no authority to execute a mortgage on the same property or to sell any other asset of the principal.
2. Powers of appointment. In property law, a special power of appointment is a power granted to a donee (the holder of the power) to appoint property only among a defined, limited class of persons — typically specified by the donor in the instrument creating the power. The donee cannot appoint the property to themselves, their estate, their creditors, or creditors of their estate (absent express authorization), and cannot appoint outside the prescribed class. This distinguishes it from a general power of appointment, which allows the donee to appoint to anyone, including themselves.
Common Confusion
Special power is most frequently confused with general power, and the distinction carries real legal consequences. In agency, an act performed outside the scope of a special power binds the agent personally but not the principal — the principal's liability depends entirely on what the instrument authorizes. In powers of appointment, the tax treatment and creditor-reach rules differ sharply between general and special powers: a general power of appointment causes inclusion in the donee's gross estate for federal estate tax purposes; a special power typically does not. Researchers moving between older property texts and modern tax materials should be alert to this distinction, as the terminology has remained consistent but the stakes attached to it have grown considerably with the development of modern estate and gift tax law.
Why It Matters in Research
The term functions differently depending on whether the research concerns agency, real property conveyancing, or trust and estate law. In historical sources, "special power" most commonly appears in property and conveyancing contexts, where the contrast with general power governed what a tenant in tail or life tenant could do with appointed property. Agency uses of the term are more common in commercial and litigation sources from the nineteenth century onward.
A persistent trap in historical sources: older authorities on powers of appointment use "special power" to mean what modern law calls a "limited power" or "non-general power." The vocabulary is stable, but the analytical framework surrounding it — particularly regarding creditor rights and tax consequences — is entirely modern. Do not read tax-era distinctions back into pre-twentieth-century treatise discussions.
Jurisdictional variation matters in the powers-of-appointment context. The Uniform Powers of Appointment Act (2013) has been adopted in a number of states and standardizes definitions, but many states retain their own statutory schemes or rely on common law. Research in any specific jurisdiction should begin with local statute before consulting uniform-act commentary.
In agency research, special power instruments require careful reading of the four corners of the document. Courts have historically construed special powers of attorney strictly, and a researcher analyzing whether a principal was bound by an agent's act must map the act precisely against the grant. This is especially important in real property chain-of-title research, where an instrument executed under a power of attorney may have a cloud if the power did not clearly authorize that transaction type.
Both Rapalje & Lawrence and Bouvier treat "special power" as a cross-reference to their general entries on POWER, which means the full doctrinal content is housed in those parent entries. Researchers using those sources should not expect a standalone special-power entry — the analytical weight is in the POWER entries themselves.
Historical Dictionary Support
Both Rapalje & Lawrence and Bouvier's Law Dictionary handle "special power" by cross-reference only, directing the reader to their respective entries on POWER. This is consistent with the organizational convention of nineteenth-century legal dictionaries, which treated "general" and "special" as modifiers explained within the parent term rather than as independent headwords. Bouvier's treatment of powers generally is extensive and covers the distinction between general and special powers in the context of powers of appointment, agency, and powers coupled with an interest. Neither source provides a standalone definition, and neither addresses the tax dimension of the general/special distinction — a gap that is expected given the pre-income-tax-era vintage of these authorities. Modern researchers should treat the historical dictionary entries as structural orientation only and supplement with twentieth-century property and tax materials for substantive doctrine.
Jurisdictional Note
Powers of appointment are governed by a mix of common law, state property statutes, and — where adopted — the Uniform Powers of Appointment Act (2013). The tax consequences of the general/special distinction are governed by federal law (Internal Revenue Code sections 2041 and 2514), which applies nationally. Agency authority under a special power of attorney is subject to state law, and several states have enacted versions of the Uniform Power of Attorney Act, which may define the scope of special or limited powers differently from common law defaults.
Encyclopedia Cross-Reference
See Agency — Special Agency Doctrines (Subagents, Power of Attorney) (The Law Mind Business Organizations & Corporate Law Encyclopedia) for treatment of special powers in the agency context, including the scope of authority analysis and third-party reliance rules.
See Congressional Power — Enumerated Powers and the Necessary and Proper Clause (The Law Mind Constitutional Law Encyclopedia) for the constitutional analog of limited versus general power allocation, which shares structural logic with the private-law doctrine though operates in an entirely distinct framework.