Definition
Gain, in legal usage, refers to an increase in value, wealth, or economic benefit received by a person or entity. The term carries distinct weight across different fields of law.
1. General property and commercial law: Any profit, increment of value, or economic advantage realized from a transaction or activity. Gain in this sense is synonymous with profit or winnings and may arise from the sale of property, the conduct of business, or any exchange in which the proceeds exceed the cost or basis.
2. Tax law: The excess of the amount realized from a sale or exchange of property over the adjusted basis of that property. Gain in this context is a term of art, precisely calculated. Not all gain is taxable: some is excluded (e.g., gain on the sale of a principal residence under certain conditions), some is deferred, and the character of gain — ordinary versus capital — determines the applicable rate of tax.
3. Equity and restitution: Gain wrongfully obtained — sometimes called wrongful gain or unjust enrichment — may be subject to disgorgement or an accounting of profits, compelling the defendant to surrender what was improperly acquired regardless of loss to the plaintiff.
4. Old English law (archaic): To cultivate or till land. Burrill records this as a distinct meaning rooted in Norman French, giving rise to related terms such as gainage. This agricultural sense is now wholly obsolete in legal usage.
Common Language
Modern common usage (Wiktionary): To acquire possession; to receive advantage or profit; to increase; to grow richer; to advance.
Historical common usage (Webster's 1913): Surprisingly, Webster's 1913 records "gain" primarily as an architectural/carpentry term — a notch cut into a beam to receive a floor joist — with no entry for the financial meaning that dominates legal usage.
The ordinary English sense of gain (to acquire or advance) tracks the general legal meaning reasonably well, but the legal term carries a precision that common usage does not. In tax law especially, gain is a calculated figure, not merely a sense of having done better. A seller who receives less cash than expected may still have realized taxable gain if the amount received exceeds the property's adjusted basis. The architectural meaning from Webster's 1913 has no legal relevance whatsoever.
Common Confusion
Gain is frequently used interchangeably with profit, income, and earnings in ordinary speech, but each term may carry a distinct legal definition depending on context.
— Profit typically refers to business surplus after deducting expenses, while gain more often describes the increment realized on the disposition of a specific asset.
— Income is broader than gain in most tax frameworks; not all income constitutes a recognized gain, and not all gain qualifies as gross income without further analysis.
— Earnings generally refers to compensation for labor or services, whereas gain typically arises from property transactions.
Anderson's Dictionary of Law implicitly acknowledges this overlap by cross-referencing EARNINGS, INCOME, LUCRUM, and PROFIT without providing a standalone definition, signaling that the term's legal content has always been understood relationally.
Why It Matters in Research
The primary research trap with gain is context collapse: the word appears in sources spanning tax law, equity, commercial law, and medieval English land tenure, and its meaning shifts substantially across each. A researcher reading an early case about gain in a property context should not assume the court is using the term in its modern tax-law sense.
In tax research specifically, the distinction between realized gain and recognized gain is foundational. Gain may be realized upon a sale yet not recognized for tax purposes in that year due to nonrecognition provisions. Corpus sources that predate modern income tax statutes will use gain loosely and should not be read to reflect the technical computational meaning the term acquired during the twentieth century.
In equity and restitution research, gain functions as a remedy-orienting concept: whether relief is gain-based (focused on what the defendant obtained) versus loss-based (focused on what the plaintiff suffered) determines the available measure of recovery. This distinction is not always clearly marked in historical sources.
The archaic agricultural meaning of gain — found in Burrill and traceable through Coke — is a genuine false cognate. Researchers working in early English land law should be alert to gainage and related terms, which have nothing to do with financial profit.
Jurisdictional variation also matters in the equity context: some common law jurisdictions treat gain-based recovery as a separate remedy category; others subsume it within unjust enrichment or account of profits. The label gain does not settle which framework applies.
Historical Dictionary Support
The historical dictionaries offer thin but useful coverage. Black's (both editions) defines gain tersely as profits, winnings, and increment of value — a convergent formulation that captures the general commercial meaning without engaging the tax-law precision that developed later. The second edition adds two case citations to anchor the definition, both from the late nineteenth century, confirming that the basic sense was stable before the income tax era.
Burrill provides the most distinctive entry by preserving the Norman French agricultural meaning — to till or cultivate — alongside the note that arable land was described in terms of hyde and gain. This is a genuinely separate word that happens to share spelling with the financial term and is of interest only in medieval land law research.
Anderson's approach of pure cross-reference is editorially honest: gain is a relational term whose content is defined by how it differs from neighboring concepts. His instinct to cluster it with earnings, income, lucrum, and profit reflects how courts and practitioners have always understood it — by comparison rather than in isolation.
What the historical dictionaries collectively miss is the technical precision that gain acquired in tax law through the twentieth century. The notion of adjusted basis, the distinction between realization and recognition, the character rules for capital versus ordinary gain — none of this appears in these sources, which limits their utility for any tax research post-1913.
Jurisdictional Note
In U.S. federal tax law, gain is a defined term governed by the Internal Revenue Code and carries specific computational rules. Common law jurisdictions outside the United States use gain in equity contexts — particularly account of profits — but the doctrinal framework for gain-based remedies varies, with English and Commonwealth courts having developed the concept somewhat differently than American courts following restatement principles.
Encyclopedia Cross-Reference
Accounting of Profits — Disgorgement of Wrongful Gains (The Law Mind Remedies & Equity Encyclopedia)
Gross Income — Gains from Sale of Property (The Law Mind Tax Encyclopedia)
Exclusions — Gain on Sale of Principal Residence (The Law Mind Tax Encyclopedia)