Definition
An estimate is a judgment, opinion, or approximate calculation of value, quantity, cost, or amount, formed from available but not necessarily complete data. Unlike a definitive valuation or a binding figure, an estimate conveys informed approximation rather than certainty.
In legal contexts, the term carries two overlapping but distinct applications:
1. General legal use. An estimate is a statement expressing the speaker's or writer's judgment on a matter — such as the estimated damages in a dispute, the estimated cost of construction, or the estimated unpaid balance on a debt — where precision is acknowledged as approximate. The term signals calculated opinion, not verified fact.
2. Construction and contract use. In contracting and public works law, an "estimate" refers specifically to a projected cost of labor and materials submitted before performance. These estimates may be preliminary (non-binding) or may carry contractual significance depending on how the parties treat them in the agreement. An engineer's or architect's estimate of project cost can be legally significant when it forms the basis of a contract price or a public bidding threshold.
3. Tax law use. In tax law, "estimated tax" is a technical term referring to periodic advance payments of income tax liability made by taxpayers who do not have sufficient withholding to cover their projected liability. This is a formal statutory mechanism governed by the Internal Revenue Code, not merely an approximation.
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Common Language
Modern common usage (Wiktionary): An approximation or rough calculation; a judgment formed without complete information.
Historical common usage (Webster's 1913): To judge and form an opinion of the value of, from imperfect data — either extrinsic (monetary) or intrinsic (moral) value; to fix worth roughly or in a general way.
The common and legal meanings share the same core — approximation formed from available data. The meaningful gap is in legal consequence: in ordinary speech, an estimate carries no binding weight. In law, the word's significance depends entirely on context. A contractor's estimate may anchor damages for breach; a public agency's cost estimate may trigger statutory bidding requirements; and a tax "estimate" is a formal statutory obligation with penalties for underpayment. Researchers should never assume an estimate in a legal instrument is merely informal.
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Common Confusion
ESTIMATE vs. APPRAISAL vs. ASSESSMENT. These terms overlap but are not interchangeable. An appraisal is typically a formal, expert-driven valuation process, often of real property, conducted according to recognized professional standards. An assessment in the tax context is an official governmental determination of taxable value — not a rough calculation. An estimate is the least formal of the three and implies acknowledged approximation. Bouvier notes that in English law, "estimate" was treated as equivalent to "assess" in the sense of fixing a sum, but this equivalence does not hold across modern American legal usage, where "assessment" carries official and often statutory weight.
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Why It Matters in Research
The word "estimate" is a chameleon in legal documents, and its significance — or lack thereof — is almost always determined by surrounding context. Researchers face several traps:
Context governs meaning entirely. Anderson's Dictionary correctly notes that "the particular idea intended to be expressed by the word must be determined by the subject-matter under consideration, together with the context of any pertinent instrument." A court interpreting whether a party's "estimate" of damages constitutes an admission, a cap, or a mere opinion will look to the instrument as a whole. Research into cases involving "estimate" in pleadings or affidavits must account for this contextual dependence.
The affidavit problem. Anderson's historical entry flags an instructive scenario: a redeeming mortgagee who stated "as near as he could estimate" a sum owed. Courts treated this as a qualified representation — not a firm admission of the exact balance. Researchers working with historical affidavits, debt instruments, or sworn statements that use estimate language should treat those figures as potentially contested approximations rather than conceded facts.
Tax law creates a distinct technical vocabulary. When the corpus shifts to tax materials, "estimated tax" is a statutory concept — not informal approximation. The Internal Revenue Code (IRC §§ 6654, 6655) imposes specific requirements and penalties for underpayment of estimated taxes. The Law Mind Tax Encyclopedia entries on this point are the primary research destination; background legal dictionary entries do not capture this technical layer.
Historical sources are thin on construction contracts. The historical dictionaries gesture at "estimated cost of a building" but do not develop the law of contractor estimates — a subject of significant modern contract litigation. Researchers working in construction law, public procurement, or design-build contracts should treat historical dictionary entries as insufficient and cross-reference specialized contract law resources.
Jurisdictional drift in public contracting. State statutes governing public works often define "engineer's estimate" or "project estimate" with legal precision for bidding purposes. These statutory definitions may diverge from the common law approximation standard. State-specific research is essential.
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Historical Dictionary Support
The historical sources — Black's (both editions), Bouvier's, and Anderson's — converge on a single core proposition: "estimate" expresses the judgment or opinion of the speaker, and it implies a calculation or computation rather than a verified fact. The repeated citation to People v. Clark, 37 Hun (N.Y.) 203, across multiple editions suggests this was the leading judicial statement of the term's meaning in the 19th-century American context.
Bouvier adds two useful extensions the others lack: first, the characterization of an estimate as a "rough valuation" or "appraisement"; second, the English law equivalence to "assess" in the sense of fixing a damages or value figure. This English usage is worth flagging because it suggests a more authoritative function for "estimate" than is typical in modern American usage, where it remains closer to the approximation pole.
None of the historical sources engage seriously with the contractual dimension of estimates in construction or supply contexts, nor do they anticipate the specialized statutory meaning in tax law. The historical definitions are adequate for understanding the term in its 19th-century judicial context — affidavits, debt calculations, general commercial disputes — but require significant supplementation for modern research purposes.
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Jurisdictional Note
Estimated tax payment obligations vary between federal and state regimes. Most states mirror the federal structure but with different thresholds, safe harbor rules, and penalty calculations. In construction and public contracting law, the legal weight of an engineer's or owner's estimate is governed by state procurement statutes that differ materially across jurisdictions. Researchers should not generalize from one state's treatment of contractor estimates to another.
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Encyclopedia Cross-Reference
Credit for Estimated Tax Payments (The Law Mind Tax Encyclopedia)
Estimated Tax Payments Requirements (The Law Mind Tax Encyclopedia)
Estimated Tax Underpayment Penalty (The Law Mind Tax Encyclopedia)
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