When you invest in property, one of the first questions you’ll want answered is: “What return am I actually getting?” That’s where ROI — Return on Investment — comes in. It’s the yardstick that tells you whether your money is working hard enough in your property, or whether it could perform better elsewhere.
In this article, we’ll break down the basics of calculating ROI on a rental property.
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Why ROI Matters
ROI gives you a clear, percentage-based view of your property’s performance. It factors in the rental income you receive, the expenses you pay, and the capital you’ve invested. By comparing ROI to alternative investments (stocks, bonds, other property), you can judge if holding or selling makes sense.
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The Basic Formula
The simplest way to calculate ROI is:
ROI (%) = (Annual Net Income ÷ Total Investment) × 100
Where:
• Annual Net Income = Total rental income – operating expenses (rates, levies, insurance, management fees, maintenance, etc.)
• Total Investment = Purchase price + transaction costs (transfer, legal, bond fees) + any upgrades/repairs
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Step 1: Work Out Your Net Income
Take your gross annual rental income and subtract all running costs. For example:
• Rental income: R120,000 (R10,000/month)
• Less expenses: R40,000 (rates, levies, insurance, maintenance)
• Net income = R80,000
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Step 2: Add Up Your Total Investment
Include everything you’ve spent to acquire and improve the property:
• Purchase price: R1,000,000
• Transfer/attorney costs: R50,000
• Renovations: R50,000
• Total investment = R1,100,000
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Step 3: Apply the Formula
ROI = (R80,000 ÷ R1,100,000) × 100
ROI = 7.3%
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Considering Finance (Leverage)
If you bought with a bond, the calculation changes slightly. Some investors measure ROI based on their own cash in the deal rather than the total purchase price.
For example:
• Property cost: R1,000,000
• Bond: R800,000 (so you put in R200,000 cash)
• Net income after bond repayments: R30,000
ROI = (R30,000 ÷ R200,000) × 100 = 15%
This shows how leverage can magnify returns — but also magnifies risk if rentals drop or interest rates rise.
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Beyond the Numbers
ROI is powerful, but it doesn’t tell the whole story. You should also factor in:
• Capital growth (how much the property’s value is increasing)
• Cost of capital (what you’d earn if the money was elsewhere, e.g. in a savings or investment account)
• Risk and effort (tenant management, maintenance headaches, vacancies)
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Conclusion
Calculating ROI isn’t just a box-ticking exercise — it’s the foundation for every property investment decision. It helps you know whether to hold, improve, or sell.
At WeSellHouses.co.za, we regularly help landlords crunch these numbers so they can see the full picture. If you’d like us to run an ROI calculation on your property, get in touch — it’s often the first step toward making smarter investment decisions.