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The Officious Bystander Test:
Implied Terms Included When Interpreting a Contract
Last Updated: June 12 2026
Question: What happens in Ontario if a contract is unclear or missing essential terms?
Answer: In Ontario, if a contract lacks clarity on an important point, a court may interpret the agreement and imply a term only when it’s necessary to make the deal workable and reflects what both parties likely intended, but it won’t rewrite the contract by adding brand-new bargain terms. For practical help reviewing unclear agreements, documenting key terms, and getting timely next steps, VP Legal Services & Notary provides Paralegal and Notary Services across Ontario, so call (437) 286-1499 to avoid delays and protect your position.
What Happens When a Contract Lacks Clarity On Terms That Are Necessary to Give a Contract a Reasonably Meaning?
When a Contract Lacks Certain Details a Court May Be Called Upon to Insert Implied Terms Within the Agreement As a Means to Determine the Intentions of the Parties. Inserting Implied Terms Differs From Adding Absent Terms.
Understanding the Officious Bystander Test As Relating to the Interpretation of Implied Terms to a Contract
A perfectly written contract often fails to exist whereas the parties to a contract, generally, lack the foresight to draft an agreement that contains every possible term to the agreement. In circumstances where a dispute subsequently arises as to what the full extent of the contract terms were, a court may be called upon to determine the unwritten terms.
The Law
In law, an implied term involves the insertion of an unwritten term that is deemed to exist as a contract intention rather than a term that actually does exist as expressed term. As a very simply example, where an agreement states a requirement to, "finish painting the wall", without stating the colour, it is likely that a court would deem that the colour of paint required is the same colour as required to "finish what was already started and thus the implied term of the contract is to use the same paint colour as was used on the partially completed portion of the wall. A formal explanation of what is meant by an implied term is provided within the case of Energy Fundamentals Group Inc. v. Veresen Inc., 2015 ONCA 514 where it was said:
[30] As observed by the application judge, a contractual term may be implied “on the basis of the presumed intentions of the parties where necessary to give business efficacy to the contract or where it meets the ‘officious bystander test.’” (M.J.B. Enterprises Ltd. v. Defence Construction (1951) Ltd., 1999 CanLII 677 (SCC), [1999] 1 S.C.R. 619).
[31] The officious bystander test was most famously articulated in Shirlaw v. Southern Foundries (1926) Ltd., [1939] 2 K.B. 206 at 227, [1939] 2 All E.R. 113 at 124 (C.A.):
Prima facie that which in any contract is left to be implied and need not be expressed is something so obvious that it goes without saying. Thus, if while the parties were making their bargain, an officious bystander were to suggest some express provision for it in their agreement, they would testily suppress him with a common: “Oh, of course.”
[32] The business efficacy test in its modern form originated in The Moorcock (1889) 14 P.D. 64, [1886-90] All E.R. Rep. 530 (C.A.) at 68:
In business transactions such as this, what the law desires to effect by the implication is to give such business efficacy to the transaction as must have been intended at all events by both parties…
[33] The Moorcock concerned a contract between a wharf operator and a ship owner; the court implied a warranty that the ship could be safely moored at the wharf with “the object of giving to the transaction such efficacy as both parties must have intended” (p. 68, 70).
[34] The business efficacy test was reviewed more recently by the Privy Council in Attorney General of Belize v. Belize Telecom Ltd., [2009] UKPC 10, [2009] 2 All E.R. 1127, at para. 22:
Take, for example, the question of whether the implied term is "necessary to give business efficacy" to the contract. That formulation serves to underline two important points. The first, conveyed by the use of the word "business", is that in considering what the instrument would have meant to a reasonable person who had knowledge of the relevant background, one assumes the notional reader will take into account the practical consequences of deciding that it means one thing or the other. In the case of an instrument such as a commercial contract, he will consider whether a different construction would frustrate the apparent business purpose of the parties. …
[35] Implication of a contractual term does not require a finding that a party actually thought about a term or expressly agreed to it. Often terms are implied to fill gaps to which the parties did not turn their minds (Belize Telecom, para. 31).
[36] On the other hand, a court will not imply a term that contradicts the express language of the contract, or is unreasonable: G. Ford Homes Ltd. v. Draft Masonry (York) Co. Ltd. (1984), 1983 CanLII 1719 (ON CA), 43 O.R. (2d) 401 (C.A.).
As per the Energy Fundamentals case, an implied term arises from what an "officious bystander" would perceive as the meaning or intent when reviewing the sensible purpose of a contract within the confines of what gives the contract "business efficacy".
It is notable that courts will only interpret and insert implied terms while courts will refrain from inserting additional terms. Essentially, courts will decide what the terms within a contract meant to say rather than engage in any attempt to add terms to the contract. The distinction between interpreting what was an implied term versus what is an insertion as an additional term can be subtle and sometimes confusing. Courts will interpret and insert implied terms; however, courts will refrain from inserting additional terms. As an example, where a loan contract states that "twelve (12) payments, each due on the 1st" is required, a court may interpret the "1st" as meaning the first day of each month, rather than first day of a week, or the seemingly absurd first day of the next twelve centuries. In this manner, a court recognizes that a payment schedule was intended and that an "officious bystander" would likely view "twelve (12) payments" as meaning monthly.
Conclusion
An implied term is a term that is interpreted as being a term within a contractual agreement despite that the term was left unexpressed within the formation of a contractual relationship - whether such occurred verbally or in writing. An implied term is inserted by interpretation where such is required to provide "business efficacy" to the contract.
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