Deposit Impact Calculator
Compare how 0%, 5%, 10%, 15% and 20% deposits affect your monthly payment, total interest and lifetime bond cost
| Deposit | Monthly | Total Interest |
|---|---|---|
| 0% | R 13 743/mo | R 1 898 322 |
| 5% | R 13 056/mo | R 1 803 406 |
| 10% ★ | R 12 369/mo | R 1 708 490 |
| 15% | R 11 682/mo | R 1 613 574 |
| 20% | R 10 994/mo | R 1 518 657 |
Three levels of detail — pick yours
Property price + rate + term → instant comparison table for 0%, 5%, 10%, 15%, 20% deposits.
Bar chart with full LTV breakdown, custom deposit slider for any percentage, and savings timeline showing how long to save each deposit level.
Deposit + rate concession combined analysis, LTV bank approval thresholds, and deposit + FLISP subsidy scenarios.
Why Your Deposit Size Matters So Much
The deposit is the single biggest lever a South African home buyer can pull to reduce their long-term costs. Every rand of deposit directly reduces the bond amount, which reduces the monthly payment — and because interest is charged on the outstanding balance, a smaller starting balance means dramatically less interest paid over the life of the loan.
For a R1,400,000 property at 10.25% over 20 years:
- A 10% deposit (R140,000) saves approximately R170,000 in total interest vs no deposit
- A 20% deposit (R280,000) saves approximately R340,000 in total interest vs no deposit
- Every extra R10,000 in deposit saves approximately R12,000–R15,000 in total interest over 20 years
Beyond interest savings, a larger deposit also improves your chances of bond approval and may qualify you for a better (lower) interest rate — amplifying the savings further.
How a Better Rate Compounds with Your Deposit
Banks price home loans based on risk. A buyer with a large deposit represents lower risk — they have more equity in the property and are statistically less likely to default. This is why buyers with 20%+ deposits often receive interest rate concessions of 0.25–0.5% below prime.
Example: R1,260,000 bond at different rates over 20 years
At 10.25% (prime, no deposit concession): ~R12,437/month — total interest: ~R1,724,880
At 10.00% (prime - 0.25%): ~R12,231/month — total interest saved: ~R49,440
At 9.75% (prime - 0.5%): ~R12,027/month — total interest saved: ~R98,400
A 20% deposit can save you both the direct interest reduction AND the rate concession — potentially R400,000+ over the life of the bond.
Strategies for Building Your Deposit
- Tax-free savings account (TFSA) — contribute up to R36,000 per year tax-free. Interest and growth accumulate without tax, making this ideal for a medium-term deposit savings goal.
- Fixed deposit or notice account — park your savings in a high-yield account for 12–24 months while you finalise your property search. Rates of 8–9% are available in 2026.
- FLISP subsidy as deposit supplement — if you earn R3,501–R22,000/month, the government FLISP subsidy can act as part of your deposit. This allows you to access the market sooner with less cash saved.
- Gift from family — a monetary gift from a family member can be used as a deposit. The bank will require a written gift letter confirming the funds are not a loan.
100% Bonds — When No Deposit Makes Sense
Some South African banks offer 100% bonds (no deposit required) for qualifying first-time buyers with strong credit profiles and stable employment. While this gets you into the property market sooner, there are important trade-offs:
- Higher monthly repayment (more to borrow)
- Significantly more total interest paid over the bond term
- Risk of being "underwater" if property values fall in the short term
- Usually higher interest rate (prime or prime+1%) vs buyers with deposits
100% bonds can make sense if: you are renting at a high rate, property prices in your area are rising quickly, or you have an urgent need to relocate. In all cases, build extra monthly payments into your budget to reduce the balance as quickly as possible.
Frequently Asked Questions
Does a larger deposit guarantee a lower interest rate?
A larger deposit improves your chances of a lower rate but does not guarantee it. Banks assess the full credit risk profile including income stability, credit score, debt-to-income ratio, and employment history alongside the deposit. A buyer with a 20% deposit and a poor credit score may still receive a higher rate than a buyer with 10% deposit and excellent credit.
That said, a deposit of 20% or more is a strong signal and typically results in the most competitive rate offers from banks.
Is it better to put all savings into a deposit or keep an emergency fund?
Financial advisors generally recommend keeping a 3–6 month emergency fund separate from your deposit, rather than putting every available rand into the deposit. Homeownership brings unexpected costs — appliance replacements, burst geysers, roof repairs — and having liquid savings prevents forced credit card debt at high interest rates.
A practical approach: save your deposit to a comfortable level (10–15%), keep 3–6 months of expenses in an accessible savings account, then make additional bond payments once you own the property to reduce the balance quickly.
Can I make additional payments to my bond after registration?
Yes. Under the National Credit Act, South African bond holders can make additional payments at any time without penalty. Extra payments go directly to reducing the outstanding capital, which reduces the interest charged in subsequent months. This is mathematically equivalent to the benefit of a larger initial deposit — and has the added advantage of building an "access bond" facility you can draw on in emergencies (check your specific bond terms).
How much deposit do I need to avoid mortgage insurance (LMI)?
South Africa does not have a mandatory Lender's Mortgage Insurance (LMI) equivalent like Australia or the US. Instead, South African banks price the credit risk of low-deposit loans into the interest rate. There is no specific deposit threshold that triggers a compulsory insurance premium — but banks typically view a 20%+ deposit most favourably.
If interest rates drop after I buy, do I benefit?
Yes. South African home loans are almost always linked to the prime lending rate (a variable rate tied to the SARB repo rate). When the SARB cuts the repo rate, the prime rate drops and your monthly payment decreases automatically — no action required.
Financial advisors often recommend maintaining the same monthly payment even after a rate cut, effectively making additional capital repayments and shortening the bond term. On a R1,260,000 bond, a 1% rate drop saves approximately R750/month — if you maintain the higher payment, you can cut years off your bond.