Cash Buyer Calculator
Compare paying cash vs getting a bond — and find the optimal deposit split that maximises your net wealth over time
| Metric | Pay Cash | Get a Bond |
|---|---|---|
| Cash outlay today | R 1 500 000 | R 1 500 000 |
| Monthly payment | — | R 0 |
| Total interest paid | — | R 0 |
| Investment portfolio (end) | R 0 | R 0 |
| Property value (end) | R 1 518 103 | R 1 518 103 |
| Net wealth (end) | R 1 518 103 | R 1 518 103 |
Assumes property appreciates at 6% pa. Investment return of 10% pa. Bond rate 10.25%. For illustration only.
Cash vs Bond: Which Strategy Builds More Wealth? How to use • Formula • Example
How to Use This Calculator
The Cash vs Bond tab compares two scenarios: paying the full property price in cash vs getting a bond and investing the cash instead. Enter the property price, available cash, bond rate, term, and your expected investment return. The calculator models which strategy produces more net wealth at the end of the bond term.
The Hybrid Strategy tab finds the optimal deposit percentage. Instead of the binary cash/bond choice, it models every deposit level (10%–100%) and calculates net wealth at term — showing exactly where investment returns exceed bond interest cost.
The Key Principle: Rate Spread
The decision hinges on one number: the difference between your bond interest rate and your investment return.
If Bond Rate ≥ Investment Return → Pay cash (guaranteed saving beats uncertain returns)
At the current prime rate of 10.25%, if you can reliably earn more than 10.25% on invested capital (JSE All Share has averaged ~10–12% annually over 20 years), the bond strategy typically wins over long periods. But this assumes consistent investment and ignores behavioural factors.
Worked Example
Siphamandla has R1,500,000 and wants to buy a R1,500,000 property. Should he pay cash or get a bond and invest the money?
Cash scenario: Pays R1,500,000. No monthly payments. After 20 years, property grows at 6% pa to approximately R4,812,000.
Bond scenario: Gets a 100% bond at 10.25% over 20 years. Monthly payment ≈ R14,807. Invests R1,500,000 at 10% pa for 20 years → portfolio grows to approximately R10,091,000. Minus total interest paid ≈ R2,054,000. Net wealth: R4,812,000 (property) + R10,091,000 − R2,054,000 = R12,849,000.
The bond strategy produces approximately R8,000,000 more in net wealth — but requires discipline to invest the cash and maintain bond payments for 20 years.
Frequently Asked Questions
Is it better to pay cash for a house or get a bond in South Africa?
Mathematically, if your investment return exceeds your bond rate, getting a bond and investing the cash produces more wealth over time. At the current prime rate of 10.25%, if you can earn more than 10.25% on invested capital (JSE has averaged ~10–12% over 20 years), the bond strategy typically wins. However, paying cash provides certainty, no monthly commitment, and eliminates default risk.
What are the advantages of paying cash for property in South Africa?
Cash buyers enjoy several advantages: stronger negotiating position (sellers prefer certainty), no bond approval delays or rejection risk, no bond registration costs (saving R15,000–R30,000), no monthly bond repayments, no credit life insurance, and significantly reduced stress. Cash purchases can also close faster (often 2–4 weeks vs 2–3 months with a bond).
What is the optimal deposit percentage to maximise wealth?
The optimal deposit depends on the spread between bond rate and investment return. When investment returns exceed the bond rate, a lower deposit is better (more cash to invest). Typically, a 10–20% deposit is mathematically optimal if you can achieve 10%+ investment returns. However, deposits of 20%+ improve your bond approval odds and may secure a lower interest rate from the bank, which changes the calculation.
Do cash buyers get a discount on property in South Africa?
Cash buyers typically have stronger negotiating leverage, particularly in a slow market. A motivated seller will often accept 3–8% below asking price for a cash deal that can close quickly with certainty. On a R2,000,000 property, that discount could be R60,000–R160,000 — partially offsetting the opportunity cost of not investing the cash.
What if I pay cash now but want a bond later?
You can register a mortgage bond after paying cash by applying for an equity release or further loan against the property. However, this is treated as a new bond application — you need to qualify on income, credit score, and the bank will do a fresh valuation. The bond registration costs (conveyancing fees, Deeds Office fees) apply again. It is generally more cost-effective to decide upfront whether to use a bond.