How to Calculate Your Bond Repayment in South Africa (2026 Guide)

If you're planning to buy property in South Africa, understanding how your bond repayment is calculated can save you from nasty surprises — and help you negotiate better terms with your bank.

What determines your monthly bond repayment

Four things decide what you'll pay each month:

• Purchase price — the value of the property you're financing
• Deposit — how much you pay upfront (this reduces the loan amount)
• Interest rate — currently linked to the prime lending rate, which sits at 11.50% as of 2026
• Loan term — usually 20 or 30 years in South Africa

Banks use a standard amortisation formula to spread your capital and interest across the full loan term. Early in the loan, most of your instalment goes toward interest. Later on, more goes toward paying down the actual capital.

A simple example

Say you buy a home for R1,500,000 with a 10% deposit (R150,000), leaving a bond of R1,350,000 over 20 years at the prime rate.

Your monthly repayment would sit in the region of R14,000 to R15,000, depending on your bank's exact rate offering and whether you qualify for a discount below prime.

What affects the rate you're offered

Your bank doesn't just apply the prime rate automatically. Your rate depends on:

• Your credit score and repayment history
• Your deposit size — larger deposits often unlock better rates
• Your income relative to the loan amount
• Whether you're a first-time buyer (some banks offer incentives)

Don't forget the extra costs

Your bond repayment is not the only cost of homeownership. Budget for:

• Transfer duty (if the property is above the threshold)
• Attorney and registration fees
• Homeowners insurance
• Monthly levies if you're buying in a complex or estate
• Rates and taxes from your municipality

Work out your exact numbers

Rather than estimating, it's worth running your actual numbers through a calculator before you go house-hunting. This tells you what you can realistically afford and what your bank is likely to approve, so you're not wasting time viewing homes outside your budget.

Use our free Bond Repayment Calculator →

It calculates your monthly repayment, total interest paid over the loan term, and gives you a realistic affordability estimate based on your income — no signup required.

Final tip

Get pre-approved before you start house-hunting. A pre-approval letter from your bank tells sellers you're a serious, qualified buyer, and it stops you from falling in love with a home you can't actually afford.