Short answer: A 12b-1 fee is a yearly charge, included in a fund’s expense ratio, that pays for marketing and for the brokers who sell the fund rather than for running it. In the SEC’s fund data (2025 Q3 to 2026 Q2), 409 index fund share classes charged one, and they cost about three times as much a year as the share classes that didn’t.
Most of what you pay for an index fund is easy to justify: someone has to run the portfolio, keep the records and hire the auditors. But in some index funds, part of the yearly fee pays for something else entirely: marketing the fund and paying the people who sell it. That part is called a 12b-1 fee, and it’s built into the expense ratio, so most investors never notice it.
We went through the fee tables that index funds file with the U.S. Securities and Exchange Commission to see how common 12b-1 fees are, how big they get, and which kinds of index funds still charge them.
The short version: 409 index fund share classes charge a 12b-1 fee, ranging from 0.02% to 1.00% a year. Classes that charge one have a median expense ratio of 0.80%, against 0.27% for those that don’t. And for most investors, there’s a way to own the same index without paying it.
What a 12b-1 fee is
The name comes from Rule 12b-1, the SEC rule that allows a fund to use its own assets to pay for distribution. The SEC’s investor site explains that “distribution fees cover the marketing and selling of fund shares, such as compensating brokers and others who sell fund shares,” and that they “also pay for advertising, printing and mailing prospectuses to new investors, and for printing and mailing sales literature.” A related charge, the shareholder service fee, “compensate[s] individuals who respond to investor inquiries and provide investors with information about their investments” (Investor.gov).
There are limits. According to the SEC’s investor bulletin on fund fees, “12b-1 fees that are used to pay marketing and distribution expenses cannot exceed 0.75% of a fund’s average net assets per year,” and “FINRA imposes an annual 0.25% cap on shareholder service fees” (SEC). Together, that’s why you’ll rarely see a 12b-1 fee above 1.00%.
How it differs from a sales load
A sales load is charged once, when you buy or sell. A 12b-1 fee is charged every year, as a percentage of your whole balance, for as long as you own the fund. It shows up as its own line in the fee table, “Distribution and/or service (12b-1) fees,” and it’s included in the total expense ratio. (Our article on sales loads on index funds covers the one-time kind.)
The same SEC bulletin carries a warning worth remembering: “no-load does not mean no fees.” A fund can advertise itself as no-load and still charge a 12b-1 fee every year.
How we measured it
We used two public SEC data sets:
- Form N-CEN, the annual report every registered fund files, to identify funds that say they are index funds.
- The Mutual Fund Prospectus Risk/Return Summary data sets, which contain each fund’s fee table, share class by share class, including the 12b-1 line.
We combined four quarters of filings (the third quarter of 2025 through the second quarter of 2026), kept each share class’s most recent prospectus, and excluded money market funds. The full method is on our Editorial Methodology page. The fund-level census behind it is in our count of how many index funds there are.
That gave us fee data for 2,773 share classes of 2,174 index funds. Of those, 2,162 share classes have a 12b-1 line in their fee table (most of the rest are ETFs, which generally don’t include one).
The headline numbers
- 409 index share classes charge a 12b-1 fee, or about 19% of the 2,162 whose fee table includes the line. They belong to 299 different index funds.
- For non-index funds, the share is much higher: about 46% of share classes with a 12b-1 line charge one.
- The most common rate is 0.25% a year (226 share classes), followed by 1.00% (80 classes), 0.15% (23) and 0.50% (20).
- Classes with a 12b-1 fee cost about three times as much. Their median expense ratio is 0.80%, compared with 0.27% for index share classes whose 12b-1 line shows zero.
- For the typical class that charges one, the 12b-1 fee is about 37% of the whole expense ratio. In other words, more than a third of what those investors pay each year goes to distribution and servicing, not to running the portfolio.
| 12b-1 fee | Index share classes |
|---|---|
| Less than 0.25% | 57 |
| 0.25% | 226 |
| More than 0.25% and less than 1.00% | 45 |
| 1.00% (or just under) | 81 |
Where you find them
The 409 share classes fall into three main groups.
1. Classes sold through brokers: Class A, C and similar
These are the classic broker-sold shares. Class A shares of index funds often carry a 0.25% 12b-1 fee on top of a front-end sales load. Class C shares usually skip the front-end load but charge a 12b-1 fee of up to 1.00% a year instead.
Our S&P 500 fee analysis shows the effect clearly. Invesco’s S&P 500 Index Fund, for example, has a 12b-1 fee of 0.25% on Class A, 1.00% on Class C and none on its R6 and Y classes, according to its prospectus. The expense ratios range from 0.19% to 1.29% for the same portfolio, and the 12b-1 fee explains most of that range.
2. Share classes used inside insurance products and retirement plans
A large share of the index classes with 12b-1 fees are portfolios sold inside variable annuities and variable life insurance, or share classes built for certain retirement plans. They often come in pairs: an initial or “Class 1” share with no 12b-1 fee and a “Service” or “Class 2” share with 0.25%. You usually can’t choose between them directly. The insurance contract or plan decides which one you get, which makes it worth asking.
In our data, about 170 of the 409 share classes have names typical of insurance or annuity portfolios.
3. Specialty and leveraged index funds
ProFunds, a family of index funds that includes leveraged, inverse and sector funds, offers most of its funds in two classes. The Service Class carries a 1.00% 12b-1 fee that the Investor Class doesn’t. For example, its Bull ProFund, which tracks the S&P 500, charges 1.49% a year in its Investor Class and 2.49% in its Service Class, according to its prospectus. The only difference is the 12b-1 fee. ProFunds’ Service Class shares account for about a quarter of all index share classes with a 12b-1 fee in our data.
What a 12b-1 fee costs you
Because it’s charged every year on your whole balance, a 12b-1 fee compounds the same way the rest of the expense ratio does.
A hypothetical example: $10,000 invested for 30 years in an index fund earning 7% a year before costs.
| Annual cost | Value after 30 years |
|---|---|
| 0.05% (a low-cost index share class) | about $75,100 |
| 0.30% (the same, plus a 0.25% 12b-1 fee) | about $70,000 |
| 1.05% (the same, plus a 1.00% 12b-1 fee) | about $56,600 |
A 0.25% 12b-1 fee costs roughly $5,100 over 30 years in this example; a 1.00% fee, about $18,400. The 7% is an assumption for illustration, not a forecast. You can compare any two fees with your own amounts in our index fund fee calculator.
Is a 12b-1 fee ever worth it?
It depends on what it pays for. In broker-sold share classes, the 12b-1 fee is usually part of how the broker or adviser who recommended the fund is paid, often year after year. If that person gives you valuable ongoing advice, you’re paying for it this way.
But for an index fund, the fee doesn’t buy better portfolio management. The holdings are set by the index. So it’s worth asking two questions:
- Is there a share class of the same fund without a 12b-1 fee that I can buy? Often there is, especially if you buy directly from the fund company or through a large brokerage.
- Would I rather pay for advice separately? You can pay an adviser a flat or hourly fee and still own index funds with no 12b-1 charge, which makes it clear what you’re paying for.
How to spot a 12b-1 fee
- Open the fund’s summary prospectus and find the “Annual Fund Operating Expenses” table.
- Look for the “Distribution and/or service (12b-1) fees” line. If it says “None” or 0.00%, there isn’t one.
- Check every share class. The same fund can charge 0% on one class and 1% on another.
- Don’t rely on “no-load.” A no-load fund can still charge a 12b-1 fee of up to 0.25% a year.
- Compare the total expense ratio. For broad index funds, the cheapest share classes from the largest fund families often cost only a few hundredths of a percent, with no 12b-1 fee at all. Our guide to expense ratios explains the rest of the fee table.
Why most index investors never pay one
The low-cost index funds that hold most index fund money are generally sold directly or through brokerages and carry no 12b-1 fee. Most ETFs don’t have one either. That’s a big part of why 81% of index share classes with a 12b-1 line in our data charge nothing, compared with about half of non-index classes.
The investors who do pay 12b-1 fees on index funds are mostly those who bought through a broker who recommended a particular share class, hold the fund inside an annuity or insurance product, or own specialty funds built for frequent trading. If one of those describes you, it’s worth a look at the fee table.
Common questions
Is a 12b-1 fee charged on top of the expense ratio? No. It’s one of the lines that add up to the expense ratio. That’s exactly why it’s easy to miss: you only see it if you read the fee table line by line.
Do ETFs charge 12b-1 fees? Most don’t. Some ETFs have adopted a 12b-1 plan on paper but set the fee at zero. A handful of the index classes with a fee in our data belong to funds that also have an ETF share class; the fee applies to their mutual fund classes.
Can a fund raise or add a 12b-1 fee later? A fund needs a written plan approved by its board to charge 12b-1 fees, and the fee must be disclosed in the prospectus. If a fee changes, the fee table in the next prospectus or supplement will show it, which is one more reason to glance at it once a year.
Does it matter in a 401(k)? Yes. Some retirement plans use share classes with 12b-1 fees to help pay for plan administration. If your plan offers several index options, compare their total expense ratios, not just their names.
The bottom line
A 12b-1 fee is a yearly charge, built into the expense ratio, that pays for selling and servicing a fund rather than managing it. About one in five index fund share classes that could charge one does, and those classes cost roughly three times as much a year as the ones that don’t. For an index fund, where the portfolio is set by the index, the cheapest way to own it is usually a share class, or an ETF, with no 12b-1 fee at all.
This article is general information based on public filings, not personal advice. Fees vary by share class and change over time; always read the current prospectus. See our Financial Disclaimer.
Sources and data notes
- SEC, Mutual Fund Prospectus Risk/Return Summary data sets, 2025 Q3 to 2026 Q2: 12b-1 fees and expense ratios by share class, from each share class’s most recent prospectus filing in the period.
- SEC, Form N-CEN data sets, 2025 Q3 to 2026 Q2: which funds report themselves as index funds, and money market status.
- SEC, Investor.gov, glossary: Distribution and/or Service (12b-1) Fees.
- SEC, Investor Bulletin: Mutual Fund Fees and Expenses: limits on 12b-1 and shareholder service fees; “no-load does not mean no fees.”
- Fund prospectuses on SEC EDGAR: Invesco S&P 500 Index Fund (December 19, 2025); Bull ProFund (November 28, 2025).
- “Insurance-type” share classes were identified by fund names (for example “VIP,” “VP,” “V.I.,” “Portfolio,” “Variable”), so that figure is approximate. The dollar example is our own calculation.
Data as of the 2026 Q2 SEC data sets. Sources checked on September 30, 2026.