Fees, taxes and net returns: what compounding costs you
An investor keeps the return after costs and tax, not the return the fund reports. This lesson explains the expense ratio, the sales charge and tax drag, with a calculator that grows $10,000 in two funds that earn the same return before costs. The funds are the Vanguard Total World Stock ETF at 0.06% and Capital Group's New Perspective Fund Class A at 0.71% with a 5.75% sales charge. It shows how much of the final value costs take over decades, and what the higher-cost fund would have to earn to catch up.
- Level
- Beginner
- Reading time
- About 24 minutes
- Know this first
- Options and futures
By the end you will be able to:
- explain the expense ratio, the sales charge and other costs of owning a fund
- calculate how fees and a sales charge change the ending value of an investment
- work out the return a higher-cost fund must earn to match a cheaper one
- distinguish gross, net and real returns
- read a fund's fee information from its own documents
What you earn is not what the fund earns
A fund reports a return, but the investor keeps something smaller. Fees come out of it, a sales charge may be taken before the money is even invested, and in most countries tax is due on part of what is left. The remainder is the net return, and over decades the gap between gross and net can be as large as the gap between a good plan and a poor one.
The SEC's investor site puts it plainly: a fund with high costs must perform better than a low-cost fund to generate the same returns for you, and even small differences in fees can translate into large differences in returns over time. This lesson turns that into numbers. It uses the growth mechanics from the lesson on compound interest, and the diversified funds described in the lessons on stocks, bonds and funds and diversification.
The costs of owning a fund
There are three layers of cost. The first is the expense ratio, the yearly cost of running the fund, stated as a percentage of the money invested and taken out of the fund's assets, so the investor never sees a bill. The SEC says a fund's costs are shown in a standardised fee table near the front of its prospectus, and that operating expenses include, for example, investment advisory fees.
The second is the sales charge, or load, which some funds deduct when an investor buys. A 5.75% load means that of every $10,000 paid in, only $9,425 is invested. The third is everything outside the fund: brokerage commissions, the bid-ask spread when buying an ETF, and any account fees. Vanguard's own example figures, quoted below, exclude brokerage commissions.
Costs hurt more than their size suggests because they compound. A cost of 0.65 percentage points a year is not taken once. It is taken from a balance that would otherwise have kept growing, every year for decades.
Two funds, the same return before costs
Suppose $10,000 is invested in either of two funds that earn exactly the same return before costs. The low-cost fund charges 0.06% a year and has no sales charge. The higher-cost fund charges 0.71% a year and a 5.75% sales charge. These are the real figures of the two funds in the next table. Set the return before costs, the number of years, and the share of each year's return paid in tax, which is the same for both funds. Rules and rates differ by country, so treat the tax setting as a rough stand-in. At the starting settings the return is 7.0% for 30 years with no tax.
$10,000 growing 7.0% a year before costs for 30 years would reach $76,123 with no costs at all. The low-cost fund ends at $74,852 and the higher-cost fund at $58,756. The higher-cost fund finishes $16,096 behind, which is 21.5% less than the low-cost fund, even though both earned the same return before costs.
Four experiments. First, at the starting settings the low-cost fund ends at $74,852 and loses $1,271 to costs, while the higher-cost fund ends at $58,756 and loses $17,367. The two funds earned the same return before costs, yet the second finishes $16,096 behind. Second, cut the years to 10. The gap shrinks to $2,215, because costs have had less time to compound. Third, set the tax to 25%. Both funds finish lower, and the gap narrows to $8,252, since there is less return left to lose to fees. Tax and fees are both subtracted from the same return, but they are not the same thing, and tax is not avoidable by choosing a cheaper fund. Fourth, set the years to 40. The gap grows to $38,284. The longer the money stays invested, the more the costs matter.
The higher-cost fund's shortfall has two parts, the yearly charge and the sales charge. At the starting settings:
| Starting settings, $10,000 for 30 years | Ending value | Behind the low-cost fund |
|---|---|---|
| Low-cost fund (0.06% a year, no sales charge) | $74,852 | $0 |
| Higher-cost fund, yearly charge only (0.71%) | $62,341 | $12,511 |
| Higher-cost fund, yearly charge and 5.75% sales charge | $58,756 | $16,096 |
The yearly charge on its own costs $12,511 over 30 years, and the sales charge adds a further $3,585. The load looks small at the start, $575 on $10,000, but the $575 never has the chance to grow.
Two real funds: Vanguard and Capital Group
The figures above are those of two funds with global stock portfolios. Vanguard Total World Stock ETF seeks to track a benchmark index of stocks in developed and emerging markets worldwide. New Perspective Fund Class A, from Capital Group, is managed by several portfolio managers and aims for long-term growth of capital. The table shows only what each charges. It says nothing about which will perform better, which nobody can know in advance.
| Costs of two global stock funds | Vanguard Total World Stock ETF | New Perspective Fund, Class A |
|---|---|---|
| How it is run | Tracks a benchmark index of developed and emerging markets stocks | Several portfolio managers choose the holdings |
| Expense ratio, a year | 0.06% | 0.71% |
| Sales charge on purchase | None | 5.75% at the maximum |
| Yearly cost per $10,000 at the expense ratio | $6 | $71 |
| Cost of the sales charge per $10,000 | $0 | $575 at the maximum |
At 0.06% the Vanguard fund costs $6 a year per $10,000 invested. At 0.71% the Capital Group fund costs $71 a year, about 12 times as much, plus the sales charge when it is bought at the maximum. The Vanguard summary prospectus's own example, which assumes a 5% return and unchanged expenses, shows a cost of $77 on $10,000 over 10 years. A higher-priced fund can still be a good choice if its managers deliver more. What the arithmetic shows is how much more they would have to deliver. To end 30 years level with the low-cost fund at a 7.0% return before costs, the higher-cost fund would have to earn about 7.86% a year before costs, 0.86 percentage points more, every year, for 30 years.
From gross to net, and to real
Two more steps separate the headline return from what an investor can use. The first is tax. The calculator treats it as a share of each year's return, which is a simplification: real systems tax dividends, interest and gains differently and at different times, and the rules differ by country. This lesson gives no tax advice, and a local tax adviser or the tax authority's guidance is the place to check.
The second is inflation. A return of 5% in a year when prices rise 2% increases purchasing power by less than 5%. The real return is (1 + nominal return) ÷ (1 + inflation) − 1, which for these numbers is 2.94%. Fees and tax come off the nominal return, and inflation then takes its share of what is left.
What this comparison leaves out
- Equal returns before costs is an assumption. Real funds earn different returns, and an active fund may beat or trail an index fund. The calculator isolates cost.
- Fees are shown at today's rates. Funds can change their expense ratios, and the Capital Group figure is the one in its prospectus dated 1 December 2025.
- Class matters. The same fund is sold in several share classes with different charges. The figures here are for one class of each.
- Tax is a simple share. Real tax depends on country, the type of income, the type of account and how long the investment is held.
- Brokerage and account costs are not modelled. They add to the total cost of owning a fund.
- A lump sum, not regular saving. Someone adding money each month feels fees on a balance that builds up gradually.
Common mistakes
Ignoring a small percentage
0.65 percentage points a year sounds trivial. The calculator shows it cost over a fifth of the final value over 30 years.
Forgetting the sales charge
A load reduces the amount invested on day one, and the lost money never compounds.
Comparing returns before costs
Compare returns after costs, which is what you receive.
Choosing a fund only because it is cheap
Low cost is one input. A fund must also hold what the investor intends to own. Cost is the part that can be known in advance.
Treating tax rules as universal
They vary widely by country and account type. Check the rules that apply to you.
Try it yourself
1. A fund has an expense ratio of 0.71%. How much does it cost each year per $10,000 invested?
Show the working
10,000 × 0.0071 = $71 a year. The fee grows with the balance, so a larger balance pays more in dollars.
2. A fund charges a 5.75% sales charge on purchase. How much of a $10,000 payment is invested?
Show the working
The charge is 10,000 × 0.0575 = $575, so $9,425 is invested.
3. $10,000 grows at 7.0% a year before costs for 30 years in a fund that charges 0.06%. What is the ending value, to the nearest dollar?
Show the working
The net return is 7.00 − 0.06 = 6.94%. 10,000 × 1.0694^30 = $74,852. With no costs at all the same sum would reach $76,123.
4. A 5% nominal return in a year when inflation is 2%. What is the real return?
Show the working
1.05 ÷ 1.02 − 1 = 2.94%. Subtracting 2 from 5 gives 3%, which is close but not exact.
5. Why can a fund with a higher return before costs still leave the investor behind?
Show the working
Because the investor keeps the return after costs. If the extra return before costs is smaller than the extra fees plus the effect of any sales charge, the investor ends with less. In the example, the higher-cost fund would need to earn about 7.86% before costs, not 7.0%, just to catch up.
Where this is used
- A saver compares the expense ratio and sales charge of two funds before buying either.
- A financial adviser shows a client how fees will affect their retirement savings over 30 years.
- An employer picks the funds offered in its retirement plan, where small cost differences are multiplied across many members.
- A regulator requires a standard fee table so investors can compare costs across funds.
Key terms
- Expense ratio
- The yearly cost of running a fund, as a percentage of its assets.
- Sales charge (load)
- A fee deducted when an investor buys shares of some funds.
- Gross return
- The return before costs and tax.
- Net return
- The return after costs and tax.
- Real return
- The return after allowing for inflation, which is the growth in purchasing power.
- Index fund
- A fund that aims to track a benchmark index.
- Active fund
- A fund whose managers choose investments in order to try to beat a benchmark.
- Share class
- A version of a fund with its own fee structure.
Questions people ask
Is a cheaper fund always better?
No. Cost is only one part of the picture. But since future performance cannot be known, cost is the part an investor can compare in advance.
Why do active funds charge more?
They employ research teams and managers who pick investments, which costs more than tracking an index. Whether it pays off is the question.
Does the expense ratio appear on my statement?
Usually not as a charge. It is deducted from the fund's assets, so it shows up as a lower return. The prospectus fee table is where to find it.
Does this lesson tell me how much tax I will pay?
No. Tax rules differ by country and account. The tax setting only shows how a tax on returns would reduce growth.
Sources and review
- US Securities and Exchange Commission, Investor.gov, Mutual fund fees and expenses, for the standardised fee table, operating expenses such as investment advisory fees, and the point that a high-cost fund must perform better to deliver the same returns.
- The Vanguard Group, Summary prospectus, Vanguard Total World Stock ETF, 27 February 2026, for the fund's objective, the absence of a sales charge, the 0.06% total annual fund operating expenses and the cost example per $10,000.
- Capital Group, New Perspective Fund, Class A, for the 0.71% expense ratio (from the prospectus dated 1 December 2025), the 5.75% maximum sales charge and the fund's objective.
How the numbers were checked: the ending values, the costs and the break-even return were recomputed in plain code, and the calculator, which runs separately, was compared with that code for every combination of settings it allows. The expense ratios and the sales charge come from the two fund documents cited above, and the dollar costs are those percentages applied to $10,000. The $10,000 investment and the equal returns before costs are assumptions for teaching.