Definition
Cash or other non-like-kind property received in an exchange transaction to equalize the values of the properties being traded. Boot does not qualify for nonrecognition treatment and therefore triggers taxable gain to the extent received.
The term carries two layers of legal meaning:
1. In tax law (primary modern usage): Any property or consideration received in a like-kind exchange that does not itself qualify as like-kind property. Boot can take the form of cash (cash boot), assumption of liabilities in excess of those transferred (mortgage boot), or other non-qualifying property. The receipt of boot causes gain recognition to the extent of the boot received, even if the overall exchange otherwise qualifies for deferral.
2. In older common law usage: An archaic form of BOTE — the right to take wood or other materials from land for specific purposes (fuel, fencing, plowing, etc.). In this sense, boot is largely obsolete in modern legal usage and appears only in historical sources and interpretive research on early English land tenures.
Common Language
Modern common usage (Wiktionary): A heavy shoe covering part of the leg; a kick; a vehicle immobilizing clamp; to start a computer.
Historical common usage (Webster's 1913): Something given to make an exchange equal or to compensate for a deficiency in value — as in "I'll give you boot, I'll give you three for one" (Shakespeare). Also: remedy, relief, or reparation.
The Webster's 1913 definition is actually the direct ancestor of the modern legal tax meaning. The ordinary commercial sense — extra consideration thrown in to balance an unequal trade — maps precisely onto how boot functions in like-kind exchange law. The gap is not semantic but one of formalization: in legal usage, boot is a defined term of art with specific consequences for gain recognition, not merely a colloquial description of lopsided bargaining.
Common Confusion
Boot is sometimes confused with the entire like-kind exchange transaction or treated as synonymous with the gain recognized. The distinction matters: boot is the consideration received that does not qualify as like-kind property; gain recognition is the tax consequence triggered by receiving it. A taxpayer can receive boot without recognizing gain equal to the full value of the boot if realized gain is smaller. Conversely, mortgage boot — where liabilities assumed by the other party exceed liabilities taken on — can produce boot even in an all-property exchange with no cash changing hands, which surprises researchers encountering the concept for the first time.
The archaic bote/boot sense (right to take wood from land) should not be confused with the exchange-equalization meaning. These are etymologically related but legally unconnected.
Why It Matters in Research
The tax law meaning of boot dominates modern legal research almost entirely. Researchers working in real estate transactions, corporate reorganizations, and partnership exchanges will encounter the term repeatedly in connection with Section 1031 (like-kind exchanges), Section 1033 (involuntary conversions), and Sections 354–356 (corporate reorganizations). Each of these regimes has its own rules about what constitutes boot and what gain recognition follows, so context determines which framework applies.
The mortgage boot trap is a common research pitfall. When a taxpayer in a 1031 exchange is relieved of debt exceeding the debt assumed on the replacement property, the net liability relief is treated as boot received — even if the taxpayer receives no cash. Researchers reading transaction documents or opinion letters must watch for this, especially in leveraged real estate deals.
Historical legal sources — including both Black's and Burrill's — cover only the archaic bote/estovers meaning. Anyone consulting historical dictionaries for research on exchange taxation will find nothing useful there. The modern tax law meaning developed entirely through statute and regulatory interpretation in the twentieth century and has no meaningful historical dictionary support.
For researchers in early land law, the bote/boot/estovers cluster requires careful attention. Black's notes the equivalence to estovers; Burrill references specific historical forms (fier-boot, cart-boot, plow-boot) that correspond to distinct rights. These subtypes are relevant when interpreting pre-modern deeds, copyhold tenure records, or English common law sources incorporated into early American land grants.
Jurisdictional variation in the tax context is modest for federal income tax purposes (Section 1031 is federal law), but state conformity to federal nonrecognition treatment varies, and state transfer taxes may treat the boot component of an exchange differently. Researchers advising on multi-state transactions should verify state-level treatment separately.
Historical Dictionary Support
Both Black's and Burrill's treat boot exclusively as an archaic form of bote, with no reference to the exchange-equalization or tax meaning. This is not a gap in the dictionaries but a reflection of when they were written — the modern tax law usage postdates the major historical law dictionaries. Burrill adds texture by citing specific forms (fier-boot for firewood, cart-boot for cart repair, plow-boot for plowing implements) drawn from Brownlow & Goldsborough and Cowell's Interpreter, which are useful pointers for historical land law research. Black's collapses the term into the estovers cross-reference without elaboration.
Neither source addresses the equalization-of-exchange meaning that Webster's 1913 captures in the general commercial sense. The Webster's entry, with its Shakespeare citation, confirms that the concept was well understood in ordinary commercial usage long before it became a term of art in tax law. The legal formalization came later.
Jurisdictional Note
The primary modern meaning of boot in tax law is governed by federal statute and Treasury regulations; state law generally follows federal treatment for income tax purposes but not uniformly. In real estate transactions involving boot, state deed transfer taxes and recording fees may apply to the full consideration — including the boot component — regardless of federal nonrecognition treatment.
Encyclopedia Cross-Reference
1031 Like-Kind Exchanges — Identification Rules, Timing, Qualified Intermediaries, and Boot (Law Mind Real Estate Transactions & Construction Encyclopedia)