How Fund Fees Affect Your Overall Return: What 1% Really Costs

By Kevin Luu, Co-Founder and Chief Learning Officer. Reviewed on 2026-09-30.

A 1% annual fund fee comes straight out of your return every year, so a fund that earns 7% before costs pays you 6%. That single point compounds against you: at a 7% gross return, a 1% fee leaves you with about 25% less money after 30 years than you would have had with no fee. On a $1 million account held for 25 years, the gap between a 1% fund and a 0.05% index fund is roughly $1.07 million.

For a two-income household in California or Washington earning $750,000 to $3 million, fees usually sit in three places at once: the taxable account built from sold RSUs, the 401(k) menu, and the kids’ 529 plans. Each one looks small on its own. Added together over two decades, they are one of the largest costs the family pays that nobody sends a bill for.

Where fund fees hide in a prospectus

Every mutual fund must show its costs in a standardized fee table near the front of the prospectus. The SEC splits them into two groups (SEC investor bulletin, Mutual Fund Fees and Expenses):

• Shareholder fees, charged to you directly: sales loads on purchase or redemption, redemption fees, exchange fees and account fees. FINRA does not permit mutual fund sales loads above 8.5%, and the cap is lower when a fund charges other fees (same bulletin).
• Annual fund operating expenses, paid out of fund assets so you never see a charge: management fees, distribution (12b-1) fees and other expenses. Their total, expressed as a percentage of average net assets, is the expense ratio.

If the fund owns other funds, as most target-date funds do, the fee table adds a line called acquired fund fees and expenses. That is the fund’s share of the underlying funds’ costs, and SEC rules place it directly above, and count it in, the Total Annual Fund Operating Expenses line (SEC Release 33-8713, Fund of Funds Investments). The expense ratio in the fund’s financial highlights can leave it out, so it may look lower than the fee table total. When you compare two target-date funds, compare the fee table’s total line, not the management fee alone.

Two costs never appear in the expense ratio. The first is trading cost inside the fund, which shows up only as a lower return. The second is any advisory or wrap fee you pay an adviser on top of the funds. The all-in number is the fund’s expense ratio plus the advisory fee.

What a 1% fee costs over 25 years, in dollars

The SEC’s own illustration uses a modest 4% return: $100,000 in a fund with a 1.00% expense ratio grows to about $179,000 after 20 years, and the fees consume nearly $30,000 more than in a fund charging 0.25% (SEC bulletin). At the account sizes our families hold, the dollars get large quickly.

Assumptions for the table below: $1,000,000 invested once, no further deposits, 7% gross annual return (an illustration, not a forecast), fee subtracted from the return each year, 25 years, taxes ignored.

The cost in year one looks harmless: 1% of $1 million is $10,000. The damage is in what that $10,000 would have earned for the next 24 years, repeated every year on a growing balance.

The same arithmetic answers a common textbook question. A fund that returns 7.0% before a 1% fee nets 6.0%. An index fund that returns 6.5% before a 0.1% fee nets 6.4%. The cheaper fund wins by 0.4% a year even though it earned less before fees, and on $1 million over 25 years that 0.4% is worth about $424,000.

Worked example: a $900,000 California household with RSUs

Consider a Bay Area couple, both in tech, with two children aged 3 and 6. Household income is about $900,000, including $300,000 a year of RSUs that they sell at vest. Their money sits in three buckets. Figures are illustrative, with the same 7% gross return assumption and fees subtracted from return.

1. Taxable brokerage account: $1,000,000 from sold RSUs. It is invested in actively managed funds averaging 0.75%. Moving to index funds at 0.05% changes the 25-year result by about $812,000, per the table above.
2. 401(k)s: about $100,000 a year combined. For 2026, each spouse can defer $24,500, and total annual additions per person, including employer and after-tax (mega backdoor Roth) money where the plan allows it, can reach $72,000 (IRS Notice 2025-67). Contributing $100,000 a year for 20 years into a 0.75% target-date fund ends about $298,000 below the same contributions into a 0.05% index option.
3. 529 plans: one $95,000 five-year election for the younger child. For 2026 a parent can front-load five years of the $19,000 gift tax annual exclusion into a 529 by making the election on a gift tax return, Form 709 (Form 709 instructions, Rev. Proc. 2025-32). Over 18 years, a 0.75% portfolio ends about $35,500 lower than a 0.05% one. California gives no state deduction for 529 contributions, so fees are one of the few levers the family controls inside the plan (FTB analysis of SB 529).

None of these changes requires a better market call. They require someone to read three fee tables and move money within accounts the family already owns.

The tax drag that active funds add in a taxable account

In a taxable account, the expense ratio is only part of the cost. Actively managed funds that trade often pass realized gains through to shareholders each year, and you owe tax on those distributions even if you reinvest them.

Keep the same couple, with taxable income of about $800,000. Suppose their $1,000,000 active fund distributes 4% of its value as short-term gains, $40,000, in a year (an assumption for illustration). Short-term gains are taxed as ordinary income:

• Federal: 37%, since the 2026 joint 37% bracket starts at $768,700 of taxable income (Rev. Proc. 2025-32).
• Net investment income tax: 3.8%, which applies above $250,000 of modified AGI on a joint return (IRS).
• California: 10.3%, the 2025 joint bracket from $742,958 to $891,542 (2026 schedules are not yet published). California has no lower rate for capital gains of any kind (FTB 2025 rate schedules, FTB capital gains).

That is 51.1%, or about $20,440 of tax on one year’s distribution: roughly 2% of the account, paid in cash that would otherwise have stayed invested. Added to a 0.75% expense ratio, the real annual cost of that fund can approach 3% in a high-turnover year. A broad index fund or ETF held in the same account typically distributes far less in capital gains, so the tax bill arrives when the family chooses to sell.

A Washington family in the same position pays no state tax on short-term gains, since Washington has no individual income tax for 2026 (WA DOR), so the bill is 40.8%, about $16,320. Washington’s capital gains tax reaches long-term gains only: 7% above the annual standard deduction ($278,000 for 2025, the latest published) and 9.9% on taxable gains above $1,000,000 (WA DOR capital gains tax, WA DOR tiered rates notice). Washington has also enacted a 9.9% income tax on AGI over $1,000,000 starting January 1, 2028 (WA DOR), so the no-income-tax advantage is narrowing for households at this level.

When paying more can be reasonable

Low cost is not the only test. A higher fee can make sense when it buys something the family would otherwise pay for or lose:

• Tax management in a large taxable account. A separately managed account that harvests losses against RSU sales may cost more than an index fund. Judge it on after-tax results, not the headline fee.
• Concentration in employer stock. Help unwinding a large single-stock position, done with the tax cost in view, can be worth more than the fee. Our equity compensation work starts there.
• Private funds. Venture and private equity funds charge an annual management fee plus a share of profits. Compare them against what the same money would have earned in a public index after all costs, as covered in VC management fees.

What rarely makes sense is paying an active fee for a fund that holds roughly what the index holds, or paying an advisory fee on top of that for a portfolio nobody reviews against its cost.

Common fee mistakes in high-income households

• Accepting the 401(k) default without reading the menu. Your plan’s annual fee disclosure lists each option’s expense ratio. The default target-date fund is not always the cheapest choice on the list. See target-date fund fees for how to compare them.
• Holding high-turnover funds in the taxable account. Where the plan menu allows, keep tax-inefficient funds in the 401(k) and index funds or ETFs in the brokerage account.
• Counting only the advisory fee. Ask for the all-in cost in dollars: advisory fee plus the weighted expense ratio of every fund held. Ask any adviser for that number, including us.
• Selling everything to switch. Moving a taxable account out of expensive funds can trigger large gains. Often the better sequence is to redirect new RSU proceeds first and sell old positions gradually or against harvested losses.

For a step-by-step method to judge what your total cost should be, see how much you should pay in investment fees.

Write down why you chose each fund

Your children will inherit accounts, and with them the funds inside. If the only record is a statement, they will not know whether a fund was chosen deliberately or simply never reviewed. A one-page note per account, listing each fund, its all-in cost, and why you hold it, teaches them how you weighed cost against value. As Kevin puts it: “Conversations fade. Documentation compounds.” That note belongs in the family’s FamilyKnowledge® Library alongside the other decisions you want them to understand.

Questions families ask about fund fees

What is a good expense ratio for an index fund?

There is no official benchmark, so compare within your own options. Look at the cheapest broad index fund on your 401(k) menu or at your brokerage, and treat that as your baseline. Any fund costing more should earn its extra cost after fees and, in a taxable account, after taxes. Check the Total Annual Fund Operating Expenses line in the prospectus fee table, which already includes acquired fund fees.

Is a 1% advisory fee worth it?

It depends on what it buys. On a $2 million portfolio, 1% is $20,000 a year before fund costs. If that fee covers tax planning on RSUs, withholding, estate documents and coordination across accounts, it may be good value. If it covers only picking funds, the table above shows what it costs over 25 years. Ask for the all-in figure in dollars.

What are acquired fund fees and expenses?

They are the costs of the funds that a fund-of-funds holds, such as the underlying index and bond funds inside a target-date fund. The prospectus shows them as a separate line in the fee table, and they are already counted in the Total Annual Fund Operating Expenses line (the expense ratio in the financial highlights may exclude them). A target-date fund with a low management fee can still be expensive once those underlying costs are added.

Your next step

Pull the most recent statement for your brokerage account, both 401(k)s and each 529, and write the expense ratio next to every fund. Multiply by the balance to get the annual dollar cost, then add any advisory fee. Most families have never seen that total. Our investment and risk management page explains how we review it, and the Tax & Wealth Assessment takes a few minutes if you want a second set of eyes. This is general education, and the right move depends on your family’s full picture.

Written by

Kevin Luu

Co-Founder and Chief Learning Officer, Bright Advisers

Kevin has advised high-income W-2 tech and biotech families since 2015, and leads the education-first Age Five Family Office from Brea, California.

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