Definition
The actual price paid for goods or property in a genuine, bona fide transaction, as distinguished from the market value of those goods. Actual cost is what a party truly expended to acquire something — the real purchase price — not what the item was worth at the time of purchase, not an estimate, and not a theoretical or constructive valuation.
In customs and revenue law, the term carries particular weight: it refers to the price honestly paid in an arm's-length transaction, used to calculate duties and tariffs on imported goods. The distinction matters because market value and purchase price can diverge significantly — goods may be bought at a discount, above market, or under circumstances that make the transaction price the only reliable measure of what was actually spent.
In broader legal and commercial contexts, actual cost may extend beyond purchase price to include all costs genuinely incurred in acquiring or producing something — freight, insurance, duties, and similar charges — depending on the contractual or statutory framework at issue.
Common Language
Modern common usage (Wiktionary): The entire expense incurred in acquiring an item, including freight, duty, etc.
Historical common usage (Webster's 1913): Not defined as a distinct entry; "cost" generally meant the price paid or the expenditure incurred to acquire or produce something.
The legal definition as developed in customs and revenue law is narrower in one respect and broader in another than ordinary usage suggests. In its classic legal form — rooted in U.S. revenue law — actual cost means specifically the bona fide purchase price, not a fully loaded acquisition cost. Modern commercial and contract usage has expanded the term to include incidental acquisition expenses, which can create ambiguity when interpreting older statutes or documents that use "actual cost" in its strict historical sense.
Common Confusion
Actual cost is frequently confused with market value and fair market value. These are distinct concepts. Market value is what a willing buyer would pay a willing seller in an open market — a hypothetical or objective measure. Actual cost is what this buyer actually paid this seller in this transaction. A party who buys goods at a distressed sale, a bulk discount, or an inflated price paid an actual cost that may bear little relation to market value. In customs valuation disputes, conflating the two is a recurring and consequential error.
Actual cost should also be distinguished from cost basis (a tax concept reflecting adjusted acquisition cost over time) and from replacement cost (what it would cost to acquire an equivalent item today).
Why It Matters in Research
The term's legal meaning was substantially shaped by interpretation of the U.S. Revenue Act of 1799, and most of the historical authority in the Law Mind corpus ties "actual cost" to customs and import duty contexts. Researchers working in contract law, construction law, or cost-accounting disputes will find the customs-law definitions dominant in older sources — this is not always the right frame for their question.
Several navigational considerations:
The historical sources all converge on a single core meaning (bona fide purchase price, not market value), so there is unusual consistency across the shelf — but that consistency reflects a narrow, customs-specific usage. Do not assume this definition controls in modern contract disputes where "actual cost" appears as a term of art in pricing clauses, government contracting, or cost-plus agreements. Those contexts have developed their own meanings, often closer to the fully loaded acquisition cost of the Wiktionary definition.
In government contracting specifically, "actual cost" interacts with cost accounting standards and the Federal Acquisition Regulation in ways the historical dictionaries do not address at all. Burrill and Bouvier are useful for the original customs-law meaning; they offer no guidance on modern procurement.
For litigation research, the distinction between actual cost and market value is the operative question in a range of damages disputes — particularly where a plaintiff claims reimbursement for what they paid rather than the value of what they lost. These are related but not interchangeable measures.
The Rapalje & Lawrence entry is garbled in the corpus — text from entries for "Acton Burnell" and "Actor" bleeds into the definition, a transcription artifact. The substantive content ("the purchase price; that which has been actually paid, without regard to the market value") is consistent with the other sources and reliable for that core proposition, but researchers should not cite the Rapalje entry as a clean source.
Historical Dictionary Support
All four historical dictionaries agree on the essential definition: actual cost means the price actually paid in a genuine purchase, not the market value of the thing purchased. The phrasing is nearly identical across Black's, Bouvier's, and Burrill's, all of which trace the definition to Justice Story's opinions in the customs context (2 Story's Reports 421, 429; 2 Mason's Reports 48).
Bouvier's is the only source that explicitly names the Revenue Act of 1799 as the statutory anchor, connecting the term to a specific legislative provision (its 66th section). Burrill confirms the same statutory construction. Black's and Burrill's cite overlapping case authority, suggesting the definition was well-settled by the mid-nineteenth century in its customs-law application.
None of the historical sources addresses the modern expansion of the term into construction contracts, cost-plus pricing, or tax accounting. The consensus definition in the historical dictionaries is reliable as far as it goes — but it does not go far enough for many contemporary research questions.
Jurisdictional Note
In U.S. federal customs law, the historical definition rooted in the Revenue Act of 1799 remains the baseline, though modern customs valuation has been extensively revised by statute and international agreement. In state contract law, "actual cost" is frequently defined by contract rather than by default legal rule, and courts will look first to the parties' agreement before applying any general definition.
Encyclopedia Cross-Reference
civpro_142: Costs and Taxation of Costs — Rule 54(d) and 28 USC 1920 (The Law Mind Civil Procedure & Evidence Encyclopedia)