Bond Affordability Calculator — South Africa
Find out how much a SA bank will lend you based on your income, expenses and the current prime rate.
Quick answer: SA banks generally allow up to roughly 30% of gross monthly income toward total debt repayments when assessing bond affordability under the National Credit Act, at the current prime lending rate of 10.50% (SARB, 28 May 2026). Your approved amount depends on income, existing debt and monthly expenses.
Bond Affordability Calculator
Prime rate: 10.50% · Typical investor rate: prime + 0.5% to prime + 1.5%
🏦 Get Pre-Qualified Before You Make an Offer
A bond originator submits your application to multiple banks simultaneously — often achieving better rates than applying direct. Completely free to use.
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How to Use This Calculator
Enter your gross monthly income (before tax) and net income (after tax). Add any existing bond repayments and other debt (vehicle finance, credit cards). Use 11.00% as the interest rate if you have a good credit profile (prime + 0.5%), or 11.25% if you are unsure.
SA banks use a 30% debt service ratio — all debt repayments cannot exceed 30% of gross income. The calculator shows your maximum bond, monthly repayment, and whether your DSR is within bank thresholds. A result below 28% DSR is considered strong.
💰 Know your net pay before you apply. Bond affordability is assessed on take-home pay, not gross salary. Use PayTools to calculate your exact net income after PAYE and UIF.
PayTools ↗What is Bond Affordability?
Bond affordability is the maximum home loan a South African bank will responsibly grant you, based on your income, expenses and existing debts. Under the National Credit Act (NCA), lenders are legally required to check that you can afford the repayments before approving a bond — so affordability is not just about what you want to borrow, but what a bank is allowed to lend you. This calculator estimates that ceiling so you can shop in the right price range and avoid making an offer you cannot finance.
How South African Banks Calculate Affordability
Banks start with your gross income, deduct tax and your regular living expenses and debt repayments, and look at the surplus left over. As a general guideline, they expect your bond repayment to take up no more than around 30% of your gross monthly income, and they assess your total debt-to-income ratio across all credit. Your repayment is then worked back from that affordable amount at the prevailing prime lending rate over a 20-year term. Existing car finance, credit cards, store accounts and personal loans all reduce what is left for a bond.
Different banks apply slightly different affordability models, which is one of the main reasons using a bond originator — who submits to multiple banks simultaneously — often produces a better outcome than applying to your own bank alone. FNB, Standard Bank, Nedbank and Absa each have different scoring approaches and risk appetites. One bank may decline an application that another approves at a competitive rate, particularly for self-employed applicants or those with irregular income.
Bond Affordability Reference Table — What You Qualify For
| Gross Monthly Income | Max Bond (no debt) | Monthly Repayment | Max Property (90% LTV) |
|---|---|---|---|
| R 20,000 | R 592,000 | R 6,000 | R 658,000 |
| R 30,000 | R 888,000 | R 9,000 | R 987,000 |
| R 45,000 | R 1,332,000 | R 13,500 | R 1,480,000 |
| R 60,000 | R 1,776,000 | R 18,000 | R 1,973,000 |
| R 80,000 | R 2,368,000 | R 24,000 | R 2,631,000 |
| R 120,000 | R 3,552,000 | R 36,000 | R 3,947,000 |
Figures calculated at 11.00% (prime + 0.5%) over 20 years with zero existing debt. Actual approval depends on credit score, expenses and bank appetite.
How a Deposit Changes What You Can Afford
A deposit does two things: it reduces the loan amount you need (and therefore the monthly repayment), and it signals lower risk to the bank, which can improve both your chance of approval and the interest rate offered. Even a 10% deposit can meaningfully lower your repayment and the total interest paid over the life of the bond, and it can be the difference between approval and decline for a borderline application.
The interest rate differential between a 100% bond and a 90% bond can be 0.25–0.75 percentage points, which compounds significantly over a 20-year term. On a R1.5 million bond, the difference between prime and prime minus 0.5% amounts to roughly R400–R500 per month in repayments — and over 20 years, that is well over R100,000 in total interest saved.
Affordability for Investment Properties
Buy-to-let buyers are assessed more strictly. Banks will usually count only a portion of the expected rental income (often around 70–80%) toward affordability, because they allow for vacancies and costs, and they typically expect a larger deposit on an investment property than on a primary residence. If you already hold bonds on other properties, those repayments count against your affordability too.
For investors with multiple properties, this cascading effect on affordability is one of the most significant constraints on portfolio growth. Each new bond reduces the surplus income available to qualify for the next one. Experienced property investors often plan their acquisition sequence carefully — building deposits through rental income, maintaining clean credit records between applications, and sometimes restructuring existing debt before applying for a new investment bond. Before you apply, use PayTools to calculate your exact net take-home pay — banks assess affordability on what you actually receive each month, not your gross salary. South African banks also stress-test applications at 2–3% above the current rate to confirm you could still service the bond if prime rises — factor this in when modelling your comfortable upper limit.
A Worked Example
For example, a household earning R45,000 gross per month, applying the standard 30% affordability ceiling, could qualify for bond repayments of up to R13,500 per month. At the current prime rate of 10.50% (SARB, 28 May 2026), that repayment capacity supports a bond of approximately R1,350,000 over 20 years — before accounting for existing debt, which reduces the available repayment capacity further, and before a deposit, which increases the affordable purchase price by reducing the required loan amount. Two applicants with identical income but different existing debt levels can therefore qualify for materially different bond amounts.
Buying your first home? Follow the complete step-by-step SA Home Buyer's Guide →