Definition
Profit and loss refers to the net financial result of a business enterprise over a given period — specifically, the difference between revenues received and all costs, expenses, and charges incurred in generating those revenues. A positive result is a profit (gain); a negative result is a loss.
In legal contexts, the term appears in two related but distinct applications:
1. As a descriptive financial concept: The aggregate gain or loss resulting from business transactions, used to measure the financial condition of a going concern, value a business interest, assess damages, or determine what a wrongdoer must disgorge.
2. As a reference to a financial statement: The profit and loss statement (also called an income statement or P&L) — the formal accounting document that summarizes revenues and expenses over a defined accounting period to arrive at net profit or net loss.
Net profit, as distinguished from gross profit, is the amount remaining after subtracting not only the direct cost of goods or services sold, but all associated overhead, operating expenses, taxes, and charges. The distinction between gross and net profit is frequently outcome-determinative in damages calculations, accounting disputes, and tax proceedings.
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Common Language
Modern common usage (Wiktionary): A profit-and-loss statement; an income statement.
Historical common usage (Webster's 1913): Not separately defined; treated as a compound accounting term referring to the account in which gains and losses of a business are recorded.
The gap worth noting: In everyday speech, "profit and loss" has collapsed almost entirely into shorthand for the financial statement itself — the document you hand to a banker or a court. In legal sources, however, the term carries substantive weight as the underlying economic concept being measured: courts must determine not just that a P&L statement exists, but what it correctly captures. Disputes often turn on how profit is calculated, not merely whether a statement was produced.
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Common Confusion
Profit and loss is sometimes used interchangeably with net income, earnings, or surplus in older legal texts and accounting treatises, but these terms are not synonymous across all contexts. Net income may carry specific statutory definitions in tax law or corporate law that differ from the common accounting sense of net profit. Surplus, particularly in corporate law, refers to assets exceeding stated capital — a distinct concept. Researchers working in pre-20th century materials should be alert to inconsistent usage, as accounting terminology was far less standardized before the adoption of uniform accounting principles in the mid-20th century.
Profit and loss should also be distinguished from profit à prendre, a property law concept referring to the right to take something from another's land. The similarity in phrasing causes occasional index and search confusion in historical sources.
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Why It Matters in Research
The term operates across at least four distinct areas of the Law Mind corpus, and researchers who encounter it in one context should not assume the definition carries over cleanly to another.
In damages and remedies research, profit and loss frames the calculation of compensatory damages (plaintiff's lost profits) and disgorgement (defendant's wrongful gains). The rules for what counts toward each figure differ, and courts have not always applied them consistently. The Remedies & Equity Encyclopedia entry on accounting of profits is the relevant starting point.
In tax research, the line between profit and loss and allowable deduction is contested terrain. The hobby loss rules (Tax Encyclopedia) illustrate how the IRS and courts police the boundary between genuine profit-seeking activity and personal expenditure dressed as business loss. The meaning of "profit motive" in tax law is a term of art with its own doctrinal history.
In business valuation and partnership disputes, profit and loss allocation provisions in partnership agreements and operating agreements are interpreted according to both contract and entity law principles, and the historical accounting meaning of the term often informs judicial construction.
In historical sources generally: Pre-uniform-accounting-standards materials (pre-1930s, roughly) use "profit and loss" in a looser, more narrative sense tied to individual bookkeeping practices. Researchers relying on 19th-century case law or treatises should expect variation in how courts defined or computed net profit, and should treat Black's formulation — "gain made by selling goods at a price beyond what they cost the seller, and beyond all costs and charges" — as a period-specific simplification, not a stable technical definition.
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Historical Dictionary Support
Black's Law Dictionary offers a concise, bookkeeping-oriented definition drawn from Wharton: profit and loss represents the gain or loss from goods bought and sold or from carrying on any business, with gain placed on the creditor's side of the ledger and loss on the debtor's side. Net profit is specifically defined as what remains after subtracting both the cost of goods and all costs and charges.
This definition reflects the mercantile accounting framework of the 19th century, where profit and loss was primarily a ledger account rather than a formal statement. The concept was well understood in commercial law long before standardized financial reporting, which is why early cases speak of profit and loss almost interchangeably with "account" or "reckoning."
What Black's does not address — and what modern legal research requires — is the distinction between accounting profit and economic profit, the treatment of depreciation, the difference between cash-basis and accrual-basis measurement, or the substantial body of tax and securities law that has since given the term regulatory content. Historical dictionaries are useful for establishing the common law baseline but should not be treated as sufficient guides for 20th- or 21st-century legal analysis.
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Jurisdictional Note
The core concept is uniform across common law jurisdictions, but the legal significance of profit and loss calculations varies considerably by context. Tax law definitions of income, loss, and deduction are creatures of federal statute with their own interpretive gloss. State partnership and LLC statutes govern profit and loss allocation among owners and differ in detail. Researchers should identify the governing statute or body of law before assuming a general definition controls.
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Encyclopedia Cross-Reference
Accounting of Profits — Disgorgement of Wrongful Gains (The Law Mind Remedies & Equity Encyclopedia)
Hobby Loss Rules (The Law Mind Tax Encyclopedia)
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