South African law does not require a loan agreement to be witnessed, notarised or registered anywhere, so an unwitnessed contract between two competent adults is fully valid. Witnesses are still worth having. If the borrower later claims a signature was forged or that they were pressured into signing, an independent adult who watched the signing and wrote down their own name, identity number and contact details is the cheapest evidence you will ever gather. Use someone who is not a party to the agreement and not standing surety for it, and have each party initial every page as well as sign the last one.
Electronic signing is recognised. The Electronic Communications and Transactions Act gives an electronic signature the same standing as a wet-ink one for most agreements, which means a loan contract signed in a reputable e-signing platform is binding, and the audit trail such platforms produce is often better proof than a scanned page. A handful of documents are excluded from that regime, including wills, agreements for the sale of immovable property and long leases of land over twenty years, so anything touching a property transfer still belongs on paper in an attorney's hands. A suretyship must in all cases be in writing and signed by the surety themselves.
Storage matters more than people expect, because a loan is enforced on the record rather than on memory. Keep the signed original, the proof of payment showing the capital going out, and a simple running ledger of every repayment received with its date and reference. Bank statements do most of that work for you if the agreed reference is used consistently. Where the borrower pays in cash, issue a written receipt each time, because unreceipted cash is the one payment method that reliably produces a dispute about what remains owing.
If repayment does stop, act early, and mind the clock. Ordinary contractual debt in South Africa prescribes three years after it becomes due, after which it can no longer be enforced. Prescription is interrupted if the borrower acknowledges the debt in writing, or if a summons is served, which is why a signed acknowledgement of debt and a fresh repayment plan is often the most useful outcome of a difficult conversation. Debt secured by a mortgage bond, and a debt that has become a court judgment, run for thirty years instead.
The enforcement route depends on the amount. Claims up to R20 000 can go to the Small Claims Court, where the process is informal, the fees are minimal and no lawyers appear on either side, which makes it the right forum for most private loans. Larger claims go to the magistrates' court, whose district civil jurisdiction extends to R200 000. Where the National Credit Act applies, the lender must first deliver the section 129 notice and allow the prescribed period to pass before issuing summons. One statutory limit protects the borrower throughout: under the in duplum rule, once the borrower is in default the interest, fees and charges that accrue may not exceed the unpaid balance of the capital as it stood at the time of default. A debt cannot quietly double itself while a dispute drags on.