How a fund's total expense ratio erodes long-term returns in rands.
Fee drag
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Value without fees
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Value after TER
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Your breakdown
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A small percentage that quietly compounds against you
The total expense ratio, or TER, looks harmless on a fact sheet. One percent a year sounds like a rounding error next to a market that might return ten or eleven percent. The problem is that the fee is charged every single year on your whole balance, so it does not just cost you one percent once. It costs you one percent of an ever-growing pot, year after year, and the money it skims off never gets the chance to compound. Over a few years the gap is small. Over a few decades it becomes one of the largest single costs in your investing life. This calculator makes that drag visible by running your investment twice, once at the full gross return and once with the TER shaved off the return each year, then showing you the rand difference.
How the calculator models the drag
The maths here is deliberately simple and honest. The tool grows your starting amount at the gross return you enter to get the no-fee outcome. It then grows the same amount at the gross return minus the TER to get the after-fee outcome, and the difference is the fee drag. Treating the TER as a straight reduction in the annual return captures the thing that matters: a fee deducted before growth compounds is a fee plus all the growth that fee would have earned. This is a pure investment-mechanics calculator with no tax assumptions baked in, so there are no SARS rates to verify here. That said, fees and tax interact in the real world. Holding cheap funds inside a tax-free savings account shelters the growth from the 40 percent capital gains inclusion and 20 percent dividends tax that would otherwise apply, so low fees and a tax-free wrapper pull in the same direction.
R500,000 for 25 years, a 1 percent TER
Take the defaults: R500,000 invested for 25 years at an 11 percent gross return, in a fund charging a 1 percent TER. At the full 11 percent, the investment grows to about R6,792,732. Knock the return down to 10 percent to reflect the fee and it grows to about R5,417,353. The fee drag, the money the TER quietly removed, is roughly R1,375,379. That is more than double your original investment, lost not to a market crash but to a one percent annual charge. The same exercise with a 0.2 percent index fund would leave the after-fee value far closer to the gross line, which is the whole case for cheap, broad funds.
TER is not the whole cost
One caution before you treat the TER as the final word. The headline TER excludes some real costs, notably transaction costs from the fund trading its holdings. South African fact sheets often quote a separate transaction cost and a combined total investment charge, or TIC, that adds the two together. When comparing funds, compare the TIC, not just the TER, or you will understate the true drag. Platform or administration fees charged by the broker you invest through sit on top of all of this and are not in the fund's number at all. To model the full impact, enter your best estimate of the all-in annual cost in the TER field rather than only the fund's quoted TER.
Who this is for and the one rule to remember
This tool is for any long-term investor choosing between funds, or wondering whether an expensive actively managed fund is worth its fee. The judgement it should leave you with is simple: a higher fee only pays for itself if the fund reliably beats a cheaper alternative by more than the fee difference, every year, which very few funds manage over decades. The common mistake is chasing a fund's past performance while ignoring its cost, when cost is the one variable you can actually control in advance. Lower the fee, lengthen the horizon, and the after-fee line in the chart climbs much closer to the fee-free one.
Is a 1 percent TER bad for a South African ETF?
For a plain index-tracking ETF, one percent is on the expensive side. Broad local and global index trackers on South African platforms are often available well below 0.5 percent, and some core funds sit near 0.2 percent. A higher TER can be reasonable for a specialist or actively managed fund, but for vanilla index exposure you are usually paying more than you need to at one percent. Run both figures through the calculator to see the rand difference over your horizon.
Do I pay the TER separately, or is it already in the price?
You never see a TER invoice. It is deducted inside the fund before the unit price or net asset value is calculated, so it quietly reduces the return you receive rather than appearing as a charge on your statement. That invisibility is exactly why investors underestimate it. The calculator surfaces the cost you would otherwise never notice by comparing the fee-free and after-fee outcomes side by side.