South African law does not require a loan of money to be in writing. A verbal agreement between two adults is a valid contract, and courts enforce them every day. The problem is never validity - it is proof. Once a dispute starts, the person claiming the money has to show the court that a loan was made, on what terms, and that it has not been repaid. A signed document does that in a minute. A recollection of a conversation in a kitchen four years ago does not.
Three legal points worth knowing before you draft
- Prescription: under the Prescription Act, an ordinary contractual debt lapses three years after it becomes due. If your agreement has no repayment date, the debt generally becomes due on demand - so a loan you never chase can quietly expire. A written acknowledgement of debt from the borrower restarts the clock.
- The National Credit Act: the NCA regulates credit agreements, but it contains exemptions for parties who are not dealing at arm's length, which usually covers a once-off loan within a family. Lend money regularly or at interest as a business and the picture changes - you may need to register as a credit provider with the National Credit Regulator, so take advice before making a habit of it.
- The in duplum rule: under South African common law, arrear interest stops running once the unpaid interest equals the outstanding capital. Writing a punitive interest rate into your template will not get you past that ceiling.
None of this makes a loan agreement a courtroom document. It is a two-page working record that keeps an ordinary arrangement clear while it is running, and gives you something concrete to stand on if it stops running. That is exactly what a good free template is for.