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A Promissory Note sets out a written promise to repay a loan or debt. This legal document can be used to clearly define repayment terms, interest, and payment obligations.
Last Update 29 May 2026
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Promissory Notes are commonly used for straightforward loans, business lending, family loans, and short-term debt arrangements.
Promissory Notes in the United Kingdom are also considered more formal than an IOU, but usually simpler and shorter than a full loan agreement.
Depending on your situation, you may want to use a loan agreement or IOU. Review how each compares to a promissory note:
| Element | Promissory Note | Loan agreement | IOU |
|---|---|---|---|
| Main purpose | Records a written promise to repay a specific debt. | Sets out detailed loan terms between borrower and lender. | Acknowledges that money is owed. |
| Level of detail | Moderate. Typically includes repayment terms, interest, and default rules. | High. Often includes detailed clauses, conditions, and obligations. | Minimal. Usually only confirms the debt exists. |
| Legal effect | Usually legally binding if properly written and signed. | Legally binding and enforceable as a contract. | May be harder to enforce without clear repayment terms. |
| Common use | Simple loans, business lending, family loans, and short-term debts. | Larger or more complex loans with greater risk. | Informal reminders between trusted parties. |
| Signature | Usually signed by the borrower. | Commonly signed by both borrower and lender. | Typically signed by the debtor. |
Below is a Promissory Note example you can look over to see how your legal document should be structured.
You can create a Promissory Note with the help of our template by following the steps below.
To understand the difference between secured and unsecured Promissory Notes in the UK, you can review the table below.
| Element | Secured Promissory Note | Unsecured Promissory Note |
|---|---|---|
| Security | Backed by collateral or assets | Not backed by collateral |
| Risk to lender | Lower risk if the borrower defaults | Higher risk for the lender |
| Common use | Larger loans or business lending | Smaller or short-term loans |
| Enforcement | Lender may claim secured assets | Lender usually relies on court action |
If you still have any doubts about how this document works, go over the following answers to commonly asked questions.
Under the Bills of Exchange Act 1882, a note becomes invalid or loses its protected status if it is not unconditional, in writing, or signed by the maker . It must also state a "sum certain" in money and avoid unenforceable penalties or unregulated consumer credit breaches.
Promissory Notes are legally binding and enforceable in the United Kingdom if they are properly executed.
They can be used in court to obtain judgements, pursue collateral, or hold multiple borrowers jointly and severally liable if terms are breached.
Yes, a Promissory Note in the United Kingdom functions as a concise financial contract. While less complex than a traditional loan agreement, this financial document is designed to be a simple contract with a six-year limitation period, or can be executed as a deed to extend legal claim viability to twelve years under UK law.
