A 1% Fund Fee Sounds Tiny. Over 30 Years, It Can Eat a Quarter of Your Portfolio
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5 min read
Open the fact sheet of almost any Indonesian reksa dana saham (equity mutual fund) and somewhere near the bottom you will find a small number labelled "biaya pengelolaan" or expense ratio: something like 1% or 2% a year. It looks too small to matter next to your actual return. That feeling is exactly why fund fees are one of the most underestimated costs in investing. A 1 percentage point difference in annual fee, held for 30 years, can shrink your final balance by roughly a quarter, using nothing but real numbers from the Indonesian market.
A fee is not a one-time charge. It is deducted from your balance every single year, which means it also reduces the base that compounds going forward. A fund charging 2% a year does not just cost you "2%". It costs you 2% of an ever-growing pile of money, for as long as you hold it, and you lose the growth that money would have earned too.
Here is what that actually does to a real number. Say you invest a Rp100,000,000 lump sum and never touch it again. Assume both funds track the Indonesian market at roughly the same gross rate before their own cost is subtracted, using the Jakarta Composite Index's (IHSG) own realized 20-year performance as a long-run reference: an investment in the IHSG from the start of 2005 to the end of 2024 gained 607.83% in total, equal to 9.77% a year compounded, according to Bolasalju.com's historical performance analysis (updated 13 February 2025). That figure is a price return and excludes reinvested dividends, so it is a conservative, not optimistic, base case.
Now subtract two different real-world fee levels from that 9.77% and let both grow for 30 years.
Net annual return = Underlying market return − Fund's annual fee
| Years held | Low-cost fund (net 8.77%/yr) | Higher-cost fund (net 7.77%/yr) | Difference |
|---|---|---|---|
| 10 years | Rp231,800,000 | Rp211,400,000 | 8.8% less |
| 20 years | Rp537,400,000 | Rp446,700,000 | 16.9% less |
| 30 years | Rp1,245,800,000 | Rp944,200,000 | 24.2% less |
Same starting amount. Same assumed market performance. The only thing that differs between the two columns is a 1 percentage point annual fee, and by year 30 the higher-cost fund has handed back nearly a quarter of what the lower-cost fund grew to, over Rp300 million on a Rp100 million starting balance. The gap barely shows up in year one. It compounds like everything else in a portfolio, which is exactly what makes it easy to ignore for decades.
This is not a hypothetical 1% versus 2%. It sits close to the real spread on offer in the Indonesian market today. WebFetch access to individual fund pages was blocked in this research pass, so the figures below are drawn from WebSearch results retrieved on 11 August 2026 against public fee comparisons and factsheet coverage, not a single fetched primary page, and should be treated as representative ranges rather than a live, complete list.
A 1 percentage point gap between those two categories, the exact gap used in the table above, is not a worst-case assumption. It is close to the ordinary distance between a plain index fund and a typical actively managed one.
None of this means an actively managed fund is always the wrong choice. A manager who genuinely and consistently beats the index net of fees can be worth the extra cost. The problem is that most people never actually check whether that is happening. They see "1%" or "2%" on a fact sheet, decide it is too small to think about, and never come back to it. The table above is the argument against that instinct: the fee is small on a single statement and large over a lifetime, and the only way to know if you are getting your money's worth is to look.
Two things are worth checking on any fund you already hold or are considering: the expense ratio printed on its fund fact sheet, and how its actual return, after that fee, compares to a plain index-tracking alternative over the same years. If you cannot find both numbers, that alone is worth noticing.
You can see how a real fee difference plays out against your own numbers, not just the hypothetical Rp100 million above, on your Portfolio Health view on your NetWort dashboard. Pull up your actual holdings and their reported expense ratios, and compare them against the current market context on NetWort's Market page, which tracks IDX sentiment alongside the indices this kind of comparison depends on. A fee you have never looked at is a decision you made anyway, whether you meant to or not.
This sits on the same underlying idea covered in why a portfolio's average return and its actual compounded result can tell two different stories: small differences that look ignorable in a single year are exactly the ones that decide the outcome once compounding has thirty years to work on them.