Mutual Fund Calculator (VND, net of fees)
A mutual fund (in Vietnam, an open-ended fund sold as chứng chỉ quỹ) pools your money with other investors and a management company invests it in stocks, bonds or a mix. In return the fund charges two fees that are easy to overlook: a one-off entry fee when you put money in, and an annual expense ratio skimmed from the whole portfolio every year, whether the fund makes money or not. Most marketing quotes a gross headline return — this calculator shows you the number that actually lands in your pocket after fees.
The expense ratio sounds trivial but compounds into a large amount because it erodes your returns year after year. Under an illustrative 11%/year gross return and a 1.5%/year expense ratio — a 9.5%/year net rate — putting in 50.000.000 VND up front and adding 3.000.000 VND a month grows to roughly 711.888.110 VND after ten years. With no fees at all, the same cash flows would reach 779.260.299 VND, so fees quietly took 67.372.189 VND — about 9% of the balance you would otherwise have had.
The tool above lets you enter the upfront amount, monthly contribution, expected return, expense ratio, entry fee and horizon, then plots two lines: the net-of-fees portfolio against a no-fee portfolio so you can watch the gap widen. One caveat governs the whole page: every return and fee figure in the examples is an illustrative assumption, not a quote. Real fund returns swing year to year and fee schedules differ — check the actual fee table and prospectus of any fund before you commit.
How the calculator computes net-of-fees returns
The net rate after the expense ratio
The expense ratio is deducted straight from the return, so the starting point is:
Net rate = Gross return − Expense ratio = 11% − 1.5% = 9.5%/year
| Symbol | Meaning |
|---|---|
| Initial investment | One-off lump sum at the start (50.000.000 VND) |
| Monthly contribution | Fixed amount added each month (3.000.000 VND) |
| Gross return | Pre-fee annual return (illustrative 11%) |
| Expense ratio | Charged on assets each year (1.5%) |
| Entry fee | Charged once on the initial lump sum (0.5%) |
The month-by-month simulation
The 0.5% entry fee applies once, to the initial lump sum only, so only 50.000.000 × (1 − 0.5%) = 49.750.000 VND is actually put to work on day one. The tool then converts the net annual rate to an effective monthly rate via (1 + r)^(1/12) − 1, adds each contribution at the start of the month, and compounds it within that month. In parallel, a "no-fee" line uses the same contributions but keeps the full 11% gross return and skips the entry fee.
Fee drag — how fees erode returns
Fee drag = No-fee value − Net-of-fees value
This is the lifetime cost of fees, including the compounding the fee money would have earned had it stayed invested. Because the expense ratio is charged on the entire portfolio every year, the bigger the balance, the larger the absolute fee, and the gap between the two lines widens over time. That is why a difference of just 1.5%/year in the expense ratio produces a large gap after a decade or two.
What the model leaves out
The calculator assumes a constant, positive return for the whole horizon, a fixed expense ratio, and ignores taxes, inflation, redemption fees and NAV spreads. Real markets have negative years and many funds use tiered fee schedules. Read the output as a scenario for comparing the impact of fees, not a forecast of returns. Re-run it with a lower return to stress-test your plan.
Worked example: 50.000.000 VND upfront + 3.000.000 VND/month at an illustrative 11%/year
Illustrative assumptions: a constant 11%/year gross return, a 1.5%/year expense ratio (9.5% net), a 0.5% entry fee on the lump sum, contributions at the start of each month, no withdrawals.
| Milestone | Total paid in | Net of fees | If no fees | Fees cost |
|---|---|---|---|---|
| Year 5 | 230.000.000 | 306.967.056 | 321.599.443 | 14.632.387 |
| Year 10 | 410.000.000 | 711.888.110 | 779.260.299 | 67.372.189 |
| Year 20 | 770.000.000 | 2.352.817.057 | 2.849.937.296 | 497.120.239 |
Three things stand out.
- Growth dominates late. By year 10 you have paid in 410.000.000 VND and end with 711.888.110 VND net of fees; the 301.888.110 VND of growth is about 42% of the ending value. The longer you stay invested, the more the market does the heavy lifting.
- Fees compound too. At year 10 fees have cost 67.372.189 VND (~9% versus the no-fee path); by year 20 that fee drag balloons to 497.120.239 VND, roughly 17% — because each year's fee also forfeits the compounding it would have generated.
- The entry fee is a small one-off. 0.5% of 50.000.000 VND is 250.000 VND — minor next to the cumulative expense ratio. When comparing funds, look at the expense ratio first, not the entry fee.
Re-run the calculator with a fund's real fee table, and try trimming the expense ratio to 1% to see the difference. FiMo also has DCA and expense-ratio tools if you want to dig deeper.
Frequently asked questions
What is a mutual fund and how are returns calculated after fees?
A mutual fund (in Vietnam, an open-ended fund sold as chứng chỉ quỹ) pools investors' money for a management company to invest in stocks, bonds or a mix. Your real return is the gross return minus fees: a one-off entry fee plus an annual expense ratio. Illustrative example: 50.000.000 VND upfront + 3.000.000 VND/month at an assumed 11%/year minus a 1.5% expense ratio reaches 711.888.110 VND net after 10 years.
How much does the expense ratio really cost over time?
More than it looks, because it is charged on the whole portfolio every year and eats into compounding. At an illustrative 11%/year with a 1.5% expense ratio, on 50.000.000 VND upfront + 3.000.000 VND/month, fees cost 67.372.189 VND after 10 years (~9% versus a no-fee path) and 497.120.239 VND after 20 years (~17%). That is the quantitative case for favouring low-expense-ratio funds.
What is the difference between gross and net return?
The gross return is the headline figure a fund advertises, before fees. The net return is what actually reaches you after the expense ratio: net rate = gross − expense ratio = 11% − 1.5% = 9.5%/year in the example. This calculator always works in net terms and adds a "no-fee" line so you can see the gap. Always confirm the fee schedule before comparing performance between funds.
Does the entry fee matter as much as the expense ratio?
Usually not. The entry fee is charged once on what you put in: 0.5% of 50.000.000 VND is 250.000 VND — small and non-compounding. The 1.5%/year expense ratio, by contrast, is deducted every year and erodes compounding, so over a long horizon it costs far more — 67.372.189 VND after 10 years in the example. When choosing a fund, look at the expense ratio first.
Is the 11%/year return in the examples guaranteed?
No. The 11%/year return and the fee levels used throughout this page are illustrative assumptions chosen to keep the math easy to follow — neither a promise nor a forecast. Fund returns vary year to year and can be negative, and past performance does not guarantee future results. Enter the return and fees you consider realistic for your own fund, and always stress-test a lower figure to see how sensitive your plan is.
How are mutual fund gains taxed for foreigners in Vietnam?
When you redeem fund certificates, individual investors in Vietnam generally pay personal income tax on the transfer value under the prevailing rules — something this calculator does not model, so its output is a pre-tax figure. Rates and mechanics can change with regulation and your tax residency status matters, so check the current tax rules or ask the fund management company before estimating your after-tax take-home.