How much deposit do you need to buy a house in South Africa?

You do not strictly need a deposit to buy a house in South Africa. 100% home loans are widely available, particularly for first-time buyers. But a deposit of 10% to 20% materially improves the interest rate a bank will offer you, and on a R1.5 million bond a better rate is worth well over R100 000 across the term.

What a deposit actually changes

Three things, in order of financial impact:

1. Your interest rate

Banks price risk. A buyer putting down 20% has skin in the game and a loan-to-value of 80%, which is materially safer for the bank than lending the full price. That shows up directly in the rate you are quoted. The difference between prime and prime less 0.5% on a R1.5 million bond over 20 years is roughly R120 000 in total interest.

2. Your monthly repayment

Obvious but worth quantifying. At 10.5% over 20 years, every R100 000 less that you borrow reduces your monthly instalment by roughly R1 000.

3. Your odds of approval

If your affordability is marginal, or your credit record has some history to it, a deposit can be the difference between a decline and an approval. It reduces the amount at risk and signals financial discipline.

So should you wait and save?

Not automatically. Saving a 20% deposit on a R1.2 million property means putting away R240 000 — which at R5 000 a month takes four years. In that time you pay rent, and property prices may move. There is a real argument for buying sooner with a smaller deposit.

The better question is: what is the smallest deposit that meaningfully improves your rate? In practice, 10% is where most banks start pricing more favourably. Going from 0% to 10% usually buys you more rate improvement than going from 10% to 20%.

The cash you need regardless

Even with a 100% bond, you must have cash for transfer duty, attorney fees and bond registration. On a R1.2 million property that is roughly R40 000 to R50 000. This catches people out constantly: they save a deposit, use all of it as a deposit, and then cannot cover the transfer costs.

If you have limited cash, it is often better to take a 100% bond and keep your savings for the transfer costs than to put everything into a deposit and have nothing left.

Model it before you decide

The deposit and loan-to-value calculator shows exactly what different deposit sizes do to your loan-to-value, your monthly repayment and your total interest. Try 0%, 10% and 20% on the property price you are considering — the numbers make the decision much clearer than any rule of thumb.