Last Updated: August 23 2026
If my Ontario contract is missing key details, can a paralegal help explain whether a court will insert implied terms instead of adding new ones?
Cross Legal Services can help you understand what happens when a contract in Ontario lacks clarity on essential terms, including how courts may apply the officious bystander test and the business efficacy approach to imply a term necessary to make the agreement work, while still refusing to add anything that contradicts the written language or is unreasonable. This implied-terms analysis is different from adding an absent term, because the court is interpreting what the parties must have intended (even if they did not expressly say it) rather than rewriting the deal. If you want a clear next step for a contract dispute, call (289) 443-0675 for a consultation with Cross Legal Services and get practical guidance on protecting your position in Ontario.
Add this website to Google Preferred Sources
What Happens When a Contract Lacks Clarity on Essential Terms?
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.
Note: Please contact Cross Legal Services by phone at: (289) 443-0675 to discuss any specific questions that you may have.
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
An implied term is an unstated term that is intellectually interpreted as existing within the contractual intention rather than an express term which is a stated, written or verbal, term to a contract. An explanation of what constitutes an implied term was well stated within 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 above in Energy Fundamentals, an implied term relates to what an "officious bystander" would view as a term necessary to provide a contract with "business efficacy", that is a sensible purpose.
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. To help appreciate the subtlety between inserting an implied term versus inserting an additional term, consider that a loan contract may state that "twelve (12) payments are due and payable on the 1st". Accordingly, a court will deem that payments are indeed due. Subsequently, the court may interpret the "1st" as meaning the first day of each month, rather than meaning the first day of every week or due the first day of each year. In this circumstance, the court is merely interpreting as an implied term when a payment is due rather than inserting a contract term that a payment is due.
Conclusion
An implied term is a term that was left unstated in the creation of a contract; and yet, the presence of the term is necessary to give "business efficacy" to the contract. There is a significant distinction between what would be inserting an implied term and what would be inserting an additional term. Appreciating this difference is necessary to the interpretation of contracts.
NOTE: A considerable number of online searches for “lawyers near me” or “best lawyer in” typically highlight an urgent requirement for skilled legal assistance rather than a particular professional designation. In Ontario, licensed paralegals operate under the same Law Society that governs lawyers and have the authority to represent clients in specific litigation situations. Advocacy, legal evaluation, and procedural expertise are fundamental to this position. Cross Legal Services provides legal representation within its licensed remit, focusing on strategic alignment, evidence preparation, and compelling advocacy designed to secure effective and positive outcomes for clients.
