New tool: a savings interest tax calculator, see what you really keep after tax

Personal Finance
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Most of us never think about it, but the interest your savings earn is taxable in South Africa. The bank quotes you a rate, you watch the interest land, and the tax only turns up later on your assessment.

The good news is that every saver gets a yearly interest exemption, R23,800 if you are under 65 and R34,500 from age 65, so a lot of people with modest savings pay nothing at all. At 8 percent that exemption covers the interest on roughly R297,500, so if your balance is under that line your interest is tax free.

This new calculator applies that exemption and your own tax rate, so you see the real return you keep after tax, not just the advertised number. Put in how much you have saved, the rate you earn and your income, and it shows what you keep, the effective rate that works out to, and how it compounds over the years. It also flags the Tax-Free Savings Account as a better home for long-term money once an ordinary account starts being taxed.

It pairs with our rate comparison tool, which shows the rates before tax, so you can find the best rate there and then see what it is really worth here.

Try it: Savings Interest Tax Calculator South Africa

Compare rates first: Cash Investment Rates South Africa 2026 | Compare Top Banks

Spotted something off, or have a question about how your interest is taxed? Reply here and let me know.

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Teachers are terrible at this stuff and I include myself. For years I just looked at the interest rate the bank advertised and assumed that was what I was getting, never thought about tax sitting on top of it.

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Yoh Lerato, you’re not alone, most of us never even think the taxman is sitting on our interest. In the shop I see this with the stokvel guys, they save nicely the whole year then get a fright when SARS sends the assessment. This tool is lekker because it shows you the real number before, not after.

What I like is that exemption point. A lot of my customers with modest savings are actually paying zero, they just don’t know it, so they sit scared of saving instead of getting their money working. Eish, that’s the part that frustrates me, fear from not knowing the rules.

Quick one though, does the calculator handle the tax-free savings account side too, or is that a different conversation?