Did You Know? What Happens When a Contract Was Never Signed — But Performed Anyway

Introduction: The Classic Dispute — “We Never Signed Anything”

Few words in business or litigation spark as much confusion and conflict as these:
“But we never signed a contract.”

In Ontario and across Canada, parties often negotiate agreements, exchange drafts, and then proceed with work, payments, or performance — only to later discover that no one ever signed the final version. When disputes arise over payment, performance, or termination, one side claims: “There was no binding contract.” The other insists: “Our conduct shows we had one.”

This guide explains how Ontario courts approach unsigned agreements, when a “handshake deal” or “conduct-based contract” can still be enforceable, and what remedies or defences are available when the absence of a signature becomes the centre of litigation.

Understanding the Core Issue: Signature vs. Intention

Under Ontario contract law, the existence of a contract depends not on formality — but on mutual intention, offer, acceptance, consideration, and certainty of terms. A signature is evidence of intention, but not always required for a binding agreement.

Key Principle:

Courts look to whether there was a “meeting of the minds” and whether the parties acted as though a contract existed.

Thus, even without signatures, a contract may still arise if:

• One party made a clear offer,
• The other accepted it, and
• Both performed obligations consistent with that agreement.

This principle sits at the heart of modern contract litigation — and has divided litigants, contractors, and corporations in countless Ontario cases.

When the Absence of a Signature May Invalidate the Contract

1️. Express Condition of Signature

If the parties explicitly agreed that no contract would exist until a document was signed, the absence of a signature will usually prevent formation.

In Bawitko Investments Ltd. v. Kernels Popcorn Ltd. (1991), 79 D.L.R. (4th) 97 (Ont. C.A.), the Court of Appeal held that “if parties do not intend to be bound until the execution of a formal contract, then there is no contract until that time.”

Key takeaway:
When the parties’ correspondence or draft language says, “This agreement shall not be binding until executed,” courts will generally uphold that condition — even if both sides partially performed.

2️. Unsettled Essential Terms

Where significant terms (such as price, duration, or scope) remain unresolved, the contract may fail for uncertainty.
See M.J.B. Enterprises Ltd. v. Defence Construction (1951) Ltd., [1999] 1 S.C.R. 619, where the Supreme Court emphasized that mutual intention and certainty of terms are prerequisites for enforceability.

3️. Conduct Inconsistent with Mutual Intention

If the parties’ behaviour shows continued negotiation or disagreement after performance began, courts may find there was no final agreement — only preliminary arrangements.

In such cases, a party may succeed by arguing:

• The performance was at risk or “subject to contract”;
• Payments or invoices were conditional; or
• Work was performed for convenience or goodwill, not under binding obligations.

When a Contract Can Be Enforced Even Without a Signature

1️. Conduct as Evidence of Agreement

In many Ontario decisions, performance itself proves intent.
If both parties acted consistently with the terms of a draft or oral agreement, courts may infer a binding contract.

In Wallace v. Allen, 2009 ONCA 36, the Ontario Court of Appeal found a binding agreement existed where the parties’ conduct demonstrated they had agreed on all essential terms — despite the absence of a formal signature.

Similarly, in Olivieri v. Sherman, 2007 ONCA 491, the Court confirmed that a settlement agreement can be binding once the parties agree on essential terms, even if formal documentation or signatures are pending.

Practical point:
Courts are reluctant to let a party escape liability after benefiting from a deal, simply because the contract was unsigned.

2️. Part Performance and Reliance

Equity intervenes where a party relies on an agreement and performs substantial obligations.
The doctrine of part performance (derived from Statute of Frauds, R.S.O. 1990, c. S.19, s. 4) allows enforcement of certain oral or unsigned contracts where performance clearly points to an agreement.

In Thompson v. Guaranty Trust Co. of Canada, [1973] S.C.R. 163, the Supreme Court confirmed that acts of part performance may remove an oral contract from the statute’s writing requirement.

3️. Estoppel by Conduct

Where one party induced reliance or accepted benefits, they may be estopped from denying the existence of a contract.
This principle prevents unjust enrichment and protects good-faith reliance.

In Frye v. Sylvestre, 2023 ONCA 796, the Ontario Court of Appeal reaffirmed that a party cannot rely on the lack of a formal signature to deny an agreement where their own conduct objectively demonstrated assent.

The Legal Framework in Ontario

Strategic Considerations for Each Side

If You’re Arguing the Contract Was Not Binding:

• Emphasize express conditions requiring signatures before binding effect.
• Highlight ongoing negotiations or missing essential terms.
• Point to draft exchanges or emails using “subject to execution” or “subject to contract” language.
• Argue that performance was preliminary, exploratory, or goodwill-based.

If You’re Enforcing an Unsigned Contract:

• Focus on consistent conduct — invoices, payments, performance, or communications showing intent.
• Use part performance as proof that both parties treated the deal as binding.
• Argue estoppel where the other side accepted benefits or induced reliance.
• Produce documentary evidence (emails, meeting minutes, payments) confirming mutual understanding of terms.

Practical Guidance for Businesses and Individuals

• Always confirm whether a signature is a precondition before acting on a draft agreement.
• Keep detailed records of communications, invoices, and performance milestones.
• Avoid ambiguous phrases like “we’ll finalize later” or “pending review.”
• If performance begins without execution, document acknowledgment of agreed terms.
• Seek legal advice early — not after disputes arise — to protect or challenge enforceability.

Conclusion: Form Might Fail — But Conduct Speaks Loudly

In Ontario contract law, signatures matter — but not always decisively.
Courts focus on substance over form: if two parties act like they have a deal, they may have one. Yet, if the evidence shows they intended to wait for formal execution, no contract exists.

For lawyers and clients alike, the lesson is clear: clarity of intention is everything. Whether negotiating, performing, or litigating an unsigned agreement, what you say and do can bind you as much as what you sign.

⚖️ Disclaimer

This publication is provided for general informational purposes only and does not constitute legal advice. You should not rely on the statements herein as a substitute for legal consultation specific to your circumstances. Every case is unique, and outcomes will vary depending on the facts and applicable law. Past results and case examples are not indicative of future success. If you require legal advice, please consult directly with a qualified lawyer.

The information contained in this article reflects contract and case law developments as of 2025 and may be subject to change through future judicial interpretation or legislative reform. Readers are encouraged to seek professional advice before acting on any matter involving unsigned or disputed agreements.

If you are currently involved in — or anticipate — a contract dispute in Ontario involving an unsigned agreement, verbal commitment, or implied contractual relationship, it is essential to understand how courts interpret these situations. The experienced civil and commercial litigation lawyers at ME Law Professional Corporation in Toronto can help you evaluate enforceability, protect your rights, and develop strategies whether you are seeking to enforce or defend against a claim.

📞 Call us at (416) 923-0003 or contact us online to schedule a consultation and learn how we can help safeguard your interests.