Fund Fee Impact Calculator (VND)
If you invest in Vietnam through open-ended mutual funds or ETFs, you pay an annual expense ratio — a management fee charged as a percentage of your assets and skimmed directly from the fund's net asset value (NAV). You never see an invoice; the fee is already netted out of the published unit price, which is exactly why it is so easy to ignore. "What's 1.5% a year between friends?" is the thought that quietly costs long-term investors a fortune.
The trap is that fees compound too — just against you. Every dong taken in fees this year is a dong that permanently leaves your portfolio and never compounds again. On a 200.000.000 VND investment, assuming an illustrative 9%/year gross return and a 1.5%/year fee over 20 years: with no fee you would end with 1.120.882.154 VND, but after fees you keep only 849.570.220 VND. The 271.311.934 VND difference goes to the fund manager — roughly 24.2% of the pot you could have had. That loss dwarfs the headline fee you think you paid, because the forgone compounding goes with it.
The calculator above lets you enter your capital, expected return, the fund's expense ratio and a horizon, then compares the with-fee and no-fee ending values side by side. One caveat: every return and fee figure on this page is an illustrative assumption — actual fund returns vary year to year and are never guaranteed, and real fee schedules differ by fund. Always read the fund's prospectus and current fee table before investing.
How the calculator measures fee drag
Two formulas, side by side
To isolate what the fee costs you, the tool runs two scenarios on the same capital over the same horizon:
No fee: FV = P × (1 + r)^n
With fee: FV = P × (1 + r − fee)^n
| Symbol | Meaning |
|---|---|
| FV | Ending value |
| P | Initial amount invested |
| r | Gross annual return as a decimal (9% = 0.09) |
| fee | Annual expense ratio (1.5% = 0.015) |
| n | Number of years |
Money lost to fees = no-fee FV − with-fee FV. This treats the fee as a straight deduction from each year's return (net return = r − fee). It is a slightly conservative approximation versus charging the fee on the average NAV within a year, but it is accurate enough to show the scale of the problem and matches the numbers the tool displays.
Why a "small" fee does big damage
Because the fee lowers your compounding rate itself, not a fixed amount. A net 9% − 1.5% = 7.5%/year still sounds healthy, yet the gap between 1.09^n and 1.075^n widens geometrically as n grows. On 200.000.000 VND over 20 years, that gap is 271.311.934 VND.
A quick gut check: on the same capital and horizon, a 1%/year fee costs 188.690.725 VND while a 2%/year fee costs 346.945.261 VND. Moving from 1% to 2% — "just one more percent" — takes an extra 158.254.536 VND out of your pocket.
What the model leaves out
It assumes a constant return and fee for the whole horizon and ignores taxes, subscription/redemption (entry/exit) fees and inflation. Real fund returns fluctuate and can be negative; real fees accrue daily on NAV. Treat the output as an illustrative comparison between cheaper and pricier funds, not a return forecast.
Worked example: 200.000.000 VND, illustrative 9%/year, 1.5%/year fee
Illustrative assumptions: 200.000.000 VND invested, a constant 9%/year gross return, a 1.5%/year expense ratio deducted from the return, no further contributions and no withdrawals.
| Milestone | No fee | After 1.5%/year fee | Lost to fees |
|---|---|---|---|
| Year 5 | 307.724.791 | 287.125.865 | 20.598.926 |
| Year 10 | 473.472.735 | 412.206.312 | 61.266.422 |
| Year 15 | 728.496.492 | 591.775.471 | 136.721.021 |
| Year 20 | 1.120.882.154 | 849.570.220 | 271.311.934 |
Notice how the last column accelerates: after 5 years the fee has taken 20.598.926 VND, but by year 20 it is 271.311.934 VND — about 24.2% of everything you could have had. That is because each dong paid early also forfeits all the compounding it would have produced.
Low-cost vs high-cost fund
Same 200.000.000 VND, same illustrative 9%/year gross return, same 20 years — only the fee differs:
| Fund type (assumed) | Annual fee | Value after 20 years |
|---|---|---|
| Low-cost index fund | 0.3% | 1.060.769.142 |
| Expensive active fund | 2.2% | 745.512.706 |
The fee difference alone — 0.3% versus 2.2% — opens a 315.256.436 VND gap after 20 years, and the pricier fund does not reliably deliver a higher gross return to make up for it. This is why long-horizon investors favour low-cost index funds and ETFs: the fee is one of the few things you can control in advance, while returns are not. To see how fees interact with a regular-investing plan, pair this with FiMo's dollar-cost averaging (DCA) calculator.
Frequently asked questions
What is a fund expense ratio?
It is the annual management fee charged as a percentage of your assets, deducted directly from the fund's net asset value (NAV) before the unit price is published. Because there is no separate bill, many investors never notice they are paying it. On 200M VND at an illustrative 9%/year, a 1.5%/year fee over 20 years quietly costs 271.311.934 VND — about 24.2% of the pot you could have had.
Is a 1.5% annual fee really a big deal?
It sounds small but compounds into a large loss, because the fee compounds against you. On 200M VND at an illustrative 9%/year over 20 years: with no fee you would have 1.120.882.154 VND, but a 1.5%/year fee leaves you with 849.570.220 VND — a loss of 271.311.934 VND. That far exceeds the headline fees you think you paid, because the compounding those fees would have earned is gone too.
What is the formula for fund fee impact?
The tool compares two formulas on the same capital and horizon: no fee FV = P × (1 + r)^n and with fee FV = P × (1 + r − fee)^n, then takes the difference. Verifiable example: P = 200,000,000, r = 0.09, fee = 0.015, n = 20 gives 1.120.882.154 VND with no fee and 849.570.220 VND after fees, a 271.311.934 VND loss. The fee is approximated as a straight deduction from each year's return.
How much does a low-cost fund beat a high-cost fund over 20 years?
By a lot. On 200M VND at an illustrative 9%/year: a low-cost 0.3%/year fund ends at 1.060.769.142 VND while a 2.2%/year fund ends at only 745.512.706 VND after 20 years — a gap of 315.256.436 VND from the fee alone. The pricier fund is not guaranteed to deliver a higher gross return to offset that drag.
How is the fee charged — do I have to pay it separately?
No — it is deducted automatically from NAV every day, so the unit price you see is already net of the fee. That is precisely why it is easy to overlook: nothing is "withdrawn" from your account; your return is just slightly lower each year. Beyond the annual expense ratio, some funds also charge subscription (buy) and redemption (sell) fees, so read the prospectus carefully.
How much extra does raising the fee from 1% to 2% cost?
On 200M VND at an illustrative 9%/year over 20 years: a 1%/year fee costs 188.690.725 VND and a 2%/year fee costs 346.945.261 VND — so "one more percent" takes an extra 158.254.536 VND. Each percentage point of fee carries enormous weight over a long horizon, which is why comparing fee tables across funds before investing is well worth the effort.
Are the return and fee figures on this page real fund numbers?
No. The 9%/year return and the fee levels used here are illustrative assumptions chosen to keep the math easy to verify. Real fund returns vary year to year, can be negative, and are never guaranteed; fee schedules differ by fund. Enter your own expected return and the fund's actual fee into the calculator — the formula is accurate at any values.