Overdue debt & interest calculator
Simple interest at the current prescribed rate of 10.5% a year, with the in duplum cap applied automatically.
Get it acknowledged
Have the debtor sign an Acknowledgement of Debt with a payment plan. Tell us and we'll prioritise building it.
Request an Acknowledgement of DebtQuestions people ask
- What interest can I charge on an unpaid debt?
- If no rate was agreed, interest runs at the prescribed rate under the Prescribed Rate of Interest Act, which is linked to the repo rate. An agreed contractual rate applies instead where there is one, subject to the National Credit Act.
- What is the in duplum rule?
- Interest stops running once the unpaid interest equals the outstanding capital. In other words, arrear interest can never exceed the amount of the original debt.
- How do I get the debtor to commit to paying?
- An Acknowledgement of Debt records the amount owed, the payment plan and what happens on default — making recovery much easier if payments stop.
General guidance, not legal advice.