A Promissory Note is a written financial instrument in which the maker (borrower) gives an unconditional promise to pay a specified sum of money to the payee (lender) either on demand or at a fixed or determinable future date. In England and Wales, promissory notes are primarily governed by the Bills of Exchange Act 1882, which provides the statutory framework for negotiable instruments including bills of exchange, cheques, and promissory notes. Section 83(1) of the Act defines a promissory note as an unconditional promise in writing, signed by the maker, to pay a sum certain in money to or to the order of a specified person.

Unlike a loan agreement, which typically sets out detailed covenants, representations, and mutual obligations between lender and borrower, a promissory note is a simpler, one-sided instrument. The maker makes a binding promise to pay; the payee does not undertake any reciprocal obligation within the note itself. This simplicity makes promissory notes a practical choice for straightforward lending arrangements between individuals, family members, friends, or small businesses where the full complexity of a formal loan agreement is unnecessary.

Promissory notes have a long history in English commercial law and remain widely used today. They are commonly employed in private lending between individuals, short-term business financing, director's loans to companies, deposits for property transactions, and settlement of existing debts. While promissory notes are negotiable instruments under the Bills of Exchange Act 1882 (meaning they can, in theory, be transferred by endorsement), in practice most private promissory notes include a restriction on transferability to prevent the note being passed to third parties without the maker's consent.

It is important to distinguish a promissory note from an IOU. An IOU is merely an acknowledgment of a debt and does not contain an unconditional promise to pay. A promissory note, by contrast, contains an express promise and is therefore a stronger legal instrument. Under English law, an IOU can serve as evidence of a debt in court proceedings, but a properly drafted promissory note provides clearer and more enforceable terms.

A Promissory Note is appropriate in a wide range of lending situations in England and Wales where a formal loan agreement would be disproportionately complex or expensive. The most common circumstances in which you should use a promissory note include the following.

Personal loans between family members or friends are the most frequent use case. When one individual lends money to another, a promissory note provides written evidence of the loan, the amount, the repayment terms, and any interest. Without a written instrument, disputes about the existence, amount, or terms of the loan can be extremely difficult to resolve. English courts require clear evidence of the terms of a contract, and a signed promissory note provides exactly that.

Director's loans to or from a company are another common situation. When a director lends money to their own company (or borrows from it), a promissory note documents the transaction for accounting, tax, and Companies House purposes. HMRC may scrutinise director's loans, and having a clear written record of the terms protects both the director and the company.

Deposits and earnest money for property transactions may be documented using a promissory note where the buyer needs to provide evidence of a commitment to pay. While the substantive property transaction will be governed by a separate contract, the promissory note can serve as an interim instrument.

Settlement of existing debts is another important use. Where a debtor owes a sum of money (for example, under an invoice or previous agreement) and the parties wish to formalise the repayment terms, a promissory note provides a clear, standalone instrument that sets out the payment schedule.

Short-term business financing between small businesses or sole traders is also a common application. Where a formal facility agreement would be disproportionate, a promissory note provides a simple and legally effective alternative.

It is critical to understand the limitation period. Under the Limitation Act 1980, the payee must commence court proceedings to recover the debt within six years of the date the cause of action accrued. If the note is executed as a deed, the limitation period is twelve years. Failure to act within the limitation period renders the debt unenforceable through the courts, although the underlying obligation is not extinguished.

A well-drafted Promissory Note for use in England and Wales must contain several essential elements to be valid under the Bills of Exchange Act 1882 and enforceable in the English courts.

The unconditional promise to pay is the defining characteristic of a promissory note. Section 83 of the Bills of Exchange Act 1882 requires that the promise be unconditional. A note that makes payment conditional on the occurrence of a future event (for example, the completion of a project or the sale of an asset) is not a valid promissory note. The promise must be absolute and unqualified.

The sum certain must be clearly stated. The principal amount must be a definite, ascertainable figure expressed in a recognised currency. In the United Kingdom, this is pounds sterling. The note should state the amount both in figures and, where possible, in words to avoid ambiguity.

The identification of the parties is essential. The note must name the maker (the person promising to pay) and the payee (the person to whom the payment is promised). Both parties should be identified by their full legal names and addresses to avoid any dispute about identity.

The repayment terms specify how and when the principal (and any interest) will be repaid. A promissory note may provide for repayment on demand, on a fixed future date (the maturity date), by instalments, or at a determinable future time. The Bills of Exchange Act 1882 requires that the time of payment be fixed or determinable.

The interest clause, if included, should specify the annual interest rate, the basis of calculation (for example, a 365-day year), and when interest accrues. While there is no general usury cap in England and Wales for unregulated lending, the interest rate must not create an unfair relationship under the Consumer Credit Act 1974 (if applicable) and must not be so extortionate as to be unenforceable at common law.

The default clause sets out the circumstances in which the entire outstanding balance becomes immediately due and payable. Typical events of default include failure to make a payment when due, insolvency of the maker, and material breach of the note's terms.

The late payment provision, if included, must represent a genuine pre-estimate of loss to be enforceable. Following the Supreme Court's decision in Cavendish Square Holding BV v Makdessi [2015] UKSC 67, a clause will not be struck down as a penalty if it protects a legitimate commercial interest and is not extravagant or unconscionable.

The governing law and jurisdiction clause should specify that the note is governed by the laws of England and Wales, with the courts of England and Wales having exclusive jurisdiction. This is particularly important where one or both parties reside outside England and Wales.

Finally, the signature of the maker is the minimum requirement for validity. The Bills of Exchange Act 1882 requires the note to be signed by the maker. While witnessing is not legally required for a simple contract, it is strongly recommended as it provides additional evidence of authenticity and voluntary execution.