When a business owner signs a promissory note or accepts a cheque in payment for goods or services, the expectation is straightforward: the instrument will be honoured when presented for payment. Yet the law of negotiable instruments, codified federally in the Bills of Exchange Act, recognizes that this expectation cannot be absolute. Circumstances arise where the person obligated to pay—the maker of a promissory note or the drawer of a cheque—has legitimate grounds to refuse payment even when a holder presents the instrument and demands what appears to be owed. These grounds are called defences to payment, and understanding them is essential for anyone who regularly deals with commercial paper in the course of business operations.
The foundation of defences to payment rests on a fundamental tension within the law of negotiable instruments. On one hand, the entire system depends on instruments being freely transferable and reliably enforceable, which requires that subsequent holders be able to collect payment without being drawn into disputes between original parties. On the other hand, basic principles of fairness and contract law demand that a person not be forced to pay when the underlying transaction was tainted by fraud, when consent was obtained improperly, or when the instrument itself was altered or forged. The Bills of Exchange Act, as of the date of authorship, resolves this tension by distinguishing between two categories of defences: those that can be raised against any holder, including a holder in due course, and those that can only be raised against ordinary holders who took the instrument with notice of problems or who did not give value for it.
The distinction between these categories is not merely academic. It determines whether a maker can successfully refuse payment or whether the holder's special status as a holder in due course cuts off the defence entirely. A holder in due course, as defined under the federal legislation, is someone who took the instrument complete and regular on its face, before it was overdue, without notice of any previous dishonour, in good faith and for value, and without notice of any defect in the title of the person who negotiated it. When an instrument passes into the hands of such a holder, most defences that the maker might have raised against the original payee become unavailable. This protection for holders in due course is what makes negotiable instruments function as near-equivalents to cash in commercial transactions.
Defences that can be raised against any holder, regardless of their status, are sometimes called real defences or absolute defences. These go to the fundamental validity of the instrument itself or to the capacity of the party being asked to pay. The most significant of these is forgery. When a maker's signature on a promissory note has been forged, that person has no liability on the instrument whatsoever because they never actually signed it. The Bills of Exchange Act, as of the date of authorship, provides that a forged signature is wholly inoperative, meaning it cannot form the basis for liability against the person whose signature was forged. This defence is available against everyone, including holders in due course, because no amount of good faith acquisition can transform a forged signature into a genuine one.
Similarly, material alteration of an instrument provides a real defence. If someone changes the amount payable, the date, the name of the payee, or any other material term after the instrument has been issued, the maker can raise this alteration as a defence against any subsequent holder. The rationale is clear: the maker agreed to pay a specific sum under specific terms, and holding them to different terms would be fundamentally unjust. However, the Bills of Exchange Act contains an important qualification. A holder in due course who takes an altered instrument without notice of the alteration may enforce it according to its original tenor, meaning according to its terms as they existed before alteration. This protects innocent parties while still preventing the fraudster from benefiting from their wrongdoing.
Lack of capacity presents another absolute defence. A person who lacked legal capacity to enter into contracts at the time they signed the instrument cannot be held liable on it. In most common law provinces, this includes individuals who were minors at the time of signing, although the precise age of majority varies slightly across jurisdictions. It also includes persons who, due to mental incapacity, could not understand the nature and consequences of what they were signing. Quebec's approach under the Civil Code of Quebec aligns with this principle, recognizing that persons of full age under tutorship or curatorship, or who were notoriously incapable of giving consent at the time of signing, may have grounds to avoid liability. Business owners should be aware that taking a promissory note from someone who lacks capacity creates collection risk that even holder in due course status cannot cure.
Fraud as to the nature of the instrument itself, sometimes called fraud in the factum or fraud in the execution, constitutes another real defence available against all holders. This occurs when a person is deceived about the very character of what they are signing. If someone presents a document as a receipt or a contract for services and the signer, acting reasonably and without negligence, does not realize they are actually signing a promissory note, no liability arises because there was never a meeting of minds about the fundamental nature of the transaction. This differs from ordinary fraud, which is merely a personal defence, because it goes to whether any instrument was ever truly created in the first place.
Personal defences, by contrast, can only be raised against ordinary holders and are cut off when an instrument passes to a holder in due course. These defences arise from problems with the underlying transaction or the relationship between the original parties. Failure of consideration is among the most common. When a business owner signs a promissory note in exchange for goods or services that the payee never delivers, or delivers in a materially defective condition, the maker has a defence based on failure of consideration. Against the original payee, this defence is complete. However, if that payee negotiates the note to a holder in due course before the delivery failure becomes apparent, the maker must pay the holder in due course and then seek recovery from the original payee through separate legal action.
Ordinary fraud, as distinguished from fraud in the factum, is another personal defence. This involves situations where the maker understood they were signing a negotiable instrument but was induced to do so by fraudulent misrepresentations about the underlying transaction. A business owner who signs a promissory note to purchase equipment after being told the equipment is new when it is actually refurbished has been defrauded, but this fraud relates to the quality of the bargain rather than the nature of the instrument. Against the fraudster, the maker can refuse payment. Against a holder in due course who acquired the note without knowledge of the fraud, the maker must pay.
Duress and undue influence constitute personal defences when they do not rise to the level of completely vitiating consent. If a person signed under physical threat or was subject to improper pressure that overwhelmed their free will, they may refuse payment to the party who exercised that duress or influence. The availability of this defence against subsequent holders depends on the severity of the duress. Courts across common law provinces have recognized that extreme duress may amount to a real defence available against all holders, while lesser forms remain personal defences cut off by negotiation to a holder in due course.
Illegality of the underlying transaction presents a nuanced situation. When a negotiable instrument is given in connection with a transaction that is illegal under Canadian law, the maker may have a defence to payment. However, the strength of this defence varies depending on whether the illegality renders the contract void or merely voidable. Contracts for purposes expressly prohibited by statute and declared void, such as certain gambling debts in jurisdictions where such debts are not legally enforceable, may give rise to real defences. Contracts that are merely voidable for regulatory non-compliance typically create only personal defences.
Understanding how these defences operate in practice requires examining how business transactions actually unfold. Consider a scenario involving a renovation contractor based in Calgary who operates as a sole proprietor serving residential and commercial clients across Alberta. In February 2026, this contractor entered into an agreement with a small property management company in Edmonton to renovate three apartment units. The total contract price was sixty-eight thousand dollars, with payment structured as follows: a deposit of twenty thousand dollars upon signing, a progress payment of twenty-four thousand dollars at the halfway point, and a final payment of twenty-four thousand dollars upon completion. Rather than cheques, the property management company proposed using promissory notes for the two later payments, allowing them to manage their cash flow while giving the contractor enforceable instruments.
The contractor agreed and received two promissory notes: one for twenty-four thousand dollars dated March 15, 2026, and another for twenty-four thousand dollars dated April 30, 2026. Both notes named the contractor as payee and were signed by the owner of the property management company personally, not in a representative capacity. The contractor began work immediately, completing demolition and rough-in work through March. When the contractor presented the first note on its maturity date, payment was made without issue. The property management company then requested that the contractor endorse and transfer the second note to a building materials supplier to whom the property management company owed money. The contractor, wanting to maintain the business relationship, agreed and endorsed the note in blank, handing it to the property management company to deliver to the supplier.
In April, disputes arose. The contractor discovered that specifications provided by the property management company contained serious errors, requiring substantial additional work. The property management company, meanwhile, alleged that work completed to date was defective and refused to authorize inspections needed for the contractor to proceed. By mid-April, the relationship had broken down entirely. The contractor stopped work, claiming the property management company had repudiated the contract by making continued performance impossible. The property management company claimed the contractor had abandoned the project. Both parties engaged lawyers and threatened litigation.
On April 30, 2026, the building materials supplier—the holder of the second promissory note—presented it to the contractor for payment. The contractor refused, arguing that they had not been paid for work performed, that the property management company had breached the contract, and that paying the note would be unjust when the underlying transaction had failed. The supplier responded that they had given value for the note by reducing the property management company's debt, they had taken the note before its maturity, they had no knowledge of any disputes between the contractor and the property management company, and the note appeared complete and regular on its face.
The legal implications of this scenario are significant for all parties involved. The contractor's defences against the property management company—failure of consideration, breach of contract, and potentially fraud if the specifications were knowingly incorrect—are personal defences that can be raised against an ordinary holder. However, the building materials supplier appears to meet all the criteria for holder in due course status under the Bills of Exchange Act. They took a complete and regular note, before maturity, for value, in good faith, and without notice of the disputes that arose later. If the supplier establishes holder in due course status, the contractor's personal defences are cut off. The contractor would be obligated to pay twenty-four thousand dollars to the supplier and then pursue the property management company separately for breach of contract.
This outcome, while potentially harsh for the contractor, reflects the policy choice embedded in negotiable instruments law: protecting the reliability of commercial paper for innocent third parties, even at the expense of parties who become embroiled in disputes with their original counterparties. The contractor's decision to endorse the note and allow it to pass to a third party eliminated the ability to withhold payment as leverage in the underlying dispute. Had the contractor refused to negotiate the note or had the contractor endorsed it with a qualified endorsement such as "without recourse," the situation might have developed differently.
The scenario also reveals issues about the form of the note and the capacity in which it was signed. Because the property management company's owner signed personally rather than in a clearly representative capacity indicating they were signing solely as an agent of the company, the contractor may have recourse against that individual personally regardless of what happens with the corporate entity. This personal liability exposure underscores why business owners should pay close attention to signature blocks on negotiable instruments and should generally insist that promissory notes from corporate payors include clear language such as "on behalf of" or "as authorized signatory for" the company, along with the corporate name and registration number.
For business owners, professionals, and non-profit operators who regularly deal with negotiable instruments, several practical considerations emerge from the legal framework governing defences to payment. First, before signing any promissory note, the maker should understand that if the note is negotiated to a holder in due course, defences arising from problems with the underlying transaction will likely be unavailable. This means the maker may end up paying the note and then chasing the original payee for compensation—a much more difficult position than simply refusing payment. When agreeing to issue a promissory note, business owners should consider whether they trust the payee not to negotiate the note to third parties before the underlying obligations are fulfilled, or whether they can negotiate contractual restrictions on negotiation.
Second, when taking a negotiable instrument in payment, the recipient should consider their own holder status. Taking an instrument with knowledge of defences the maker might raise, or taking it after it has become overdue, prevents the holder from achieving holder in due course status and exposes them to those defences. Due diligence before accepting a negotiated instrument is therefore essential. Asking questions about the underlying transaction, requesting documentation that goods were delivered or services performed, and verifying that the instrument has not been dishonoured can help a potential holder assess whether they will have good title and enforceable rights.
Third, business owners should maintain clear documentation of all transactions involving negotiable instruments. When defences to payment are raised, evidence matters enormously. Documentation of what was delivered, when, and in what condition; records of communications between parties; and proof of any modifications to the underlying agreement can all become critical if payment is disputed. This applies equally to makers who may need to prove their defences and to holders who may need to prove they lacked notice of defects.
Fourth, the distinction between real and personal defences should inform how business owners respond to red flags. If there is any suspicion that a signature might be forged, that an instrument might have been altered, or that the signer lacked capacity, these concerns should be addressed immediately because real defences can defeat even a holder in due course. Obtaining verification of signatures through notarization or witness attestation, examining instruments carefully for signs of alteration, and being cautious when dealing with individuals whose capacity might be questionable are all prudent practices.
Fifth, business owners operating in Quebec should understand that while the Bills of Exchange Act applies federally across Canada, the interpretation of underlying concepts like consent, capacity, and fraud may be influenced by Quebec's civil law tradition under the Civil Code of Quebec. The fundamental categories of defences remain similar, but the precise contours of when consent is vitiated or when a contract is null may differ from common law provinces. Business owners in Quebec or those dealing with Quebec-based parties should be attentive to these distinctions.
Finally, when disputes arise involving negotiable instruments, early legal advice is valuable. The technical requirements for establishing holder in due course status, the precise boundaries between real and personal defences, and the procedures for raising defences when an instrument is presented can all affect outcomes significantly. Business owners who find themselves facing a claim on a negotiable instrument or whose instruments have been dishonoured should seek guidance promptly rather than assuming they understand their rights and obligations based on the underlying transaction alone. The law of negotiable instruments developed over centuries to serve the needs of commerce, and its technical rules sometimes produce results that seem counterintuitive to those unfamiliar with the policy choices embedded within them. Understanding defences to payment is one part of the broader commercial literacy that Canadian business owners need to navigate this specialized area of law effectively.