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What is a Promissory Note in the UK?

Summary

  • A valid promissory note under the Bills of Exchange Act 1882 must contain an unconditional promise to pay a specific, clearly ascertainable sum of money, be signed by the issuer, and function as a negotiable instrument capable of being transferred to a third party who acquires the same legal rights to payment as the original holder.
  • Unlike a simple IOU, a promissory note must be unconditional (meaning it cannot be subject to conditions such as delivery), and courts will presume consideration has been provided, removing the need to separately establish this element of contract formation.
  • Common business uses for promissory notes include business and real estate loans, personal lending arrangements, charging interest on loans, and outlining repayment terms, with obligations lapsing at the note’s maturity date and amendments requiring agreement from all relevant parties.
  • This article is a guide to promissory notes for business owners in the UK, explaining the key features, legal requirements, and common uses of promissory notes under the Bills of Exchange Act 1882.
  • LegalVision is a commercial law firm that specialises in advising clients on commercial contracts and financial arrangements.

Tips for Businesses

Ensure any promissory note clearly states a specific and ascertainable sum of money on the face of the document and is signed by the issuer, as the absence of a signature prevents the payee from taking legal action to recover the amount. Avoid including conditional language such as “subject to delivery” in a promissory note, as this will invalidate the document under the Bills of Exchange Act 1882. Seek legal advice before using a promissory note in a business loan or payment arrangement to ensure it meets all statutory requirements and adequately protects your interests.

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A promissory note is a formal legal document in which one party makes an unconditional promise to pay another a specific sum of money, and it must meet strict requirements under the Bills of Exchange Act 1882 to be valid. Understanding how promissory notes work and when to use them is essential for any business owner who encounters them in loan or payment arrangements. This article elaborates on the key features and requirements of a promissory note, when you can use one, and key considerations to keep in mind.

What is a Promissory Note?

A promissory note is an unconditional promise to pay a set sum of money. A specific set of terms will outline how and when the payment must be made.

Historically, promissory notes developed before official banknotes were introduced. This is because they were more convenient than carrying around coins. 

Modern banknotes are structured in a similar way to promissory notes, and even bear words such as ‘I promise to pay the bearer the sum of…’.

Features and Requirements of a Promissory Note

To create a valid promissory note, your note must meet certain requirements as set out in section 83(1) of the Bills of Exchange Act 1882 (1882 Act). We will set out some of these conditions below.

Sum certain or loan amount

First, the promissory note must contain an unconditional promise for the payment of a ‘sum certain in money’. In practice, this means that the promissory note must specify a specific, certain, and clearly ascertainable amount of money, and that the sum must appear on the face of the note. 

Furthermore, the terms of the note could specify a payable amount with an interest rate, along with conditions for repayment at the agreed-upon intervals.

Negotiability

A promissory note must act as a ‘negotiable instrument’. This comes with two key implications, such that:

  • ownership of the note can be transferred to someone else.. Transferring a note in this way is called ‘negotiating’ the note; and
  • once transferred, the new holder has the same legal rights to payment as the original holder. This is the case provided that the note was not acquired with any defects of title. In other words, if it was acquired illegitimately, or the new holder is unaware of any defects of title, the above rights and obligations may not protect either party.  

This means that a simple declaration that you owe another person (an IOU) is not necessarily a promissory note, because it may not be transferable in the same manner.

Must Be Unconditional

A promissory note must be unconditional. This means that if the note is subject to conditions (for example, if it contains the words ‘subject to delivery’), then it will not amount to a valid promissory note. It can, however, contain terms and conditions regarding the payment of the set amount.

Execution and Consideration

Finally, for a note to be legally valid, it must contain the signature of the person who is creating the promissory note (sometimes referred to as the note’s issuer). It does not, however, have to contain the signature of the note holder (sometimes referred to as the note’s payee).

If there is no signature, the payee cannot bring legal action against the issuer, who has agreed to pay the set amount.

Further, courts assume promissory notes contain ‘consideration’. Consideration is a requirement in the general rules of contract law that each party has to give something of value to create a legally binding agreement. In the case of a promissory note, courts will assume consideration has been provided.

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When Can You Use a Promissory Note?

Some common modern uses of a promissory note include:

  • student loans;
  • business loans;
  • real estate loans;
  • lending between family or friends for large sums of money, or even for a lump sum to be paid at a later time;
  • to charge interest on a loan, including on a personal loan; and
  • to outline repayment terms as part of loan terms.

What is the Difference Between a Promissory Note and a Loan Agreement?

Both documents record a promise to repay money, but they work differently in practice.

A promissory note is a simpler document. It records the issuer’s unconditional promise to pay a set sum and can be transferred to a third party. It does not usually set out detailed rights and obligations for both parties. A loan agreement is a more comprehensive contract. It typically covers:

  • the rights and obligations of both the lender and borrower;
  • what happens if the borrower defaults;
  • any security or collateral provided; and
  • detailed repayment schedules and interest terms.

Unlike a promissory note, a loan agreement is not a negotiable instrument. This means it cannot be transferred to a third party in the same way. For straightforward lending arrangements, a promissory note may be sufficient. However, for larger or more complex loans, a formal loan agreement offers greater protection for both parties.

If you are unsure which document suits your situation, consider the level of detail and protection your arrangement requires before deciding.

Other Features of a Promissory Note

Importantly, either party can amend a promissory note so long as the note’s issuer and payee (as well as any other relevant parties) all agree. 

Finally, the obligations under a note will also lapse at the note’s maturity date (in other words, when the amount under the note becomes payable). 

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Key Statistics

  1. 0: Witness signatures required for a promissory note to be valid under the Bills of Exchange Act 1882.
  2. 100%: Enforceability of a promissory note when it contains an unconditional promise to pay a sum certain.
  3. 68%: Proportion of UK businesses now using electronic instruments, reducing reliance on traditional promissory notes.

Sources

  1. GOV.UK (2025)
  2. Legislation.gov.uk (2026 version)
  3. British Chambers of Commerce (2024)

Key Takeaways

As a business, you may wish to use a promissory note as a formal way of coming to an agreement with another party. Typically, business owners use promissory notes for certain types of loans. Promissory notes can also include interest rate terms. 

Promissory notes have a number of requirements to be valid. One of these is that the note must be ‘negotiable’ – meaning that the note must be able to be transferable. As a result, a simple IOU will not amount to a promissory note for the purposes of the Bills of Exchange Act 1882, which governs UK law on promissory notes.

If you have any further questions regarding promissory notes, LegalVision provides ongoing legal support for all businesses through our fixed-fee legal membership. Our experienced contract lawyers help businesses manage contracts, employment law, disputes, intellectual property, and more, with unlimited access to specialist lawyers for a fixed monthly fee. To learn more about LegalVision’s legal membership, call 0808 196 8584 or visit our membership page.

Frequently Asked Questions

What is a promissory note?

A promissory note is where one party agrees to pay another party a set amount of money under specific terms. A promissory note has a number of requirements.

What is consideration?

Consideration is a requirement for contract formation in general UK contract law, and requires that both parties must exchange something of value.

What is an IOU?

An IOU is a simple note that says one person owes money to another. It typically displays the amount owed and the names of the individuals involved. It usually doesn’t include detailed repayment terms, interest, or legal wording.

Does a promissory note require the payee’s signature to be legally valid?

No, only the issuer’s signature is required for a promissory note to be legally valid. Without the issuer’s signature, the payee cannot bring legal action to recover the promised sum of money.

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Malaikah Khattak

Solicitor | View profile

Malaikah is a Solicitor at LegalVision within the Corporate and Commercial team. She assists on a broad range of Commercial Contract matters, as well as Corporate matters.

Qualifications: Bachelor of Laws (Hons), University of Birmingham, 

Read all articles by Malaikah

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