Practical guide
How Bond Repayments Are Calculated
A standard bond repayment spreads the financed amount and interest over the loan term. The payment depends mainly on the outstanding principal, interest rate and number of monthly instalments.
Fact checked and updated 13 September 2026
Principal, rate and term
A larger deposit reduces the financed principal. A higher interest rate increases both the instalment and total interest, while a longer term usually lowers the monthly payment but can increase total interest substantially.
Why bank figures differ
Many South African home loans use a variable rate linked to prime. Initiation fees, monthly service fees, insurance and rate changes can make a lender quotation differ from a basic amortisation result.
Use scenarios before applying
Compare more than one deposit, rate and term. Leave room for rates and household costs to change, and use the bank’s pre-agreement statement for the final repayment and total cost.
Use the related calculators
Apply the explanation above with your own figures. Open a calculator below, check every input and review the result assumptions before making a decision.
Official source checked
This guide was checked against National Credit Regulator. Rules, rates and institutional requirements can change, so confirm time-sensitive information at the official source.