The simple answer is your bond repayment should sit under 30% of your gross monthly income, and your total debt repayments including the new bond should stay under 40%. That is the rule of thumb South African banks use when they assess your application, and it is the same maths your home loan will pass or fail on. So if you earn R50 000 a month before tax, your bond repayment should not be more than R15 000, and once you add your car finance and credit cards the total should not pass R20 000.
That gives you the repayment limit, not the house price. To get from one to the other you need three more numbers. The interest rate the bank will offer you, which tracks prime and sits around 11% as a working figure unless you have a reason to use something else. The term of the bond, almost always 20 years, which spreads the repayments thinner. And the deposit you can put down, which directly lowers what you have to borrow.
Plug all of that into the actual bond formula and a R50 000 income with an R150 000 deposit lands you at roughly R1.6 million as a comfortable house price at current rates. Push to the absolute bank limit and you might stretch to R1.9 million, but you would be living tight and sweating every petrol price hike. So the realistic answer for that income is in the R1.5 to R1.8 million range, not the dream number a generic affordability calculator hands you.
Here is the catch nobody talks about. The bond repayment is only part of the monthly cost. The actual cheque you write each month also includes municipal rates, which are roughly R800 to R1 500 on a R2 million home, a sectional title levy if you are in a complex which can be anything from R500 to R3 000, home insurance at around R500 to R1 000 a month, and your utilities which now means electricity, water and increasingly inverter or solar costs.
Add those up and your true monthly cost on a R2 million home is closer to R23 000 than the R20 000 bond repayment the bank calculator shows. That extra R3 000 is what catches new homeowners out, because the bank says you qualify on R20 000 but your bank account says you cannot live on what is left after R23 000. The honest affordability question is whether your income can carry the full monthly cost, not just the bond.
Beyond income, banks check three things. Your credit score, which for a decent home loan rate you want above 650. Your existing debt commitments, which eat into the 40% total ceiling and reduce what you can borrow on top. And your deposit, because a 10% deposit gets you a noticeably better rate than no deposit at all, and a 20% deposit better still. So if you are still saving, every extra rand of deposit does double work, it shrinks the loan and it cheapens what is left.
One thing the banks are watching closely in South Africa right now is the credit card debt that does not look like a problem on its own. A R5 000 monthly credit card payment knocks R5 000 off your 40% ceiling, which on the bond side translates to roughly R500 000 less house. So before you apply, the single best move is to pay down or close any revolving credit you are not actively using.
If you want a number you can actually use rather than a generic calculator output, the steps are. Work out your gross monthly income, your existing debt commitments and your available deposit. Apply the 30% and 40% rules to find your repayment ceiling. Then add the rates, levy, insurance and utilities for the kind of home you want, and check whether the full monthly cost still fits in your life. If it does, you can afford the home. If it does not, the bank may approve you but the home will own you, not the other way around.
This is exactly what the shouldibuy.co.za comparison tool does, and it does it on real listings rather than abstract numbers. You can paste up to four Property24 links or just type in the prices, enter your income and deposit once, and see which homes you can comfortably afford and which ones look fine on paper but quietly push you over the edge.
Free, no signup, takes 90 seconds and compares up to four homes side by side.
Open the calculator →