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Everyone who sells you an investment says they can beat the market. The data on that claim is less flattering than the pitch, and cost and time do more of the work than most pitches admit.
I am not a financial professional, and I am not going to tell you what to buy. This piece is for owners who already know the building blocks and want to understand the next argument: index funds vs active funds, why cost keeps showing up in the research, and what time does to the whole picture.
Educational content, not financial, tax, legal or investment advice. Talk to a licensed professional about your situation.
If you need the vocabulary first, start with Investing Basics for Founders, which covers stocks, bonds, funds and risk. Then come back here.
What is an index fund, exactly?
The SEC describes an index fund as a type of mutual fund or exchange-traded fund that seeks to track the returns of a market index, such as the S&P 500 or the Wilshire 5000 Total Market Index.1
You cannot invest in an index itself, because it is a measure of a basket of securities. A fund that tracks it gives you an indirect way in.1
- Market indexA measured basket of securities
- Index fundA fund that seeks to track the basket
- Fund costsPaid out of the fund's assets every year
- Your sharesA slice of the fund, with market risk
- Your resultThe index return, minus costs, in theory
Passive and active in one paragraph
Index funds generally follow a passive style, meaning they do not trade very often. An actively managed fund tries to outperform a market by trading more.1 Index managers do not need research analysts to pick securities, which may lower costs. The SEC adds a warning: not all index funds have lower costs than actively managed funds.1
The risks the SEC names
An index fund has the same general risks as the securities it tracks. It may also have less flexibility to react to price declines, may not perfectly track its index, and can underperform it because of fees, trading costs and tracking error.1
How often do active funds actually win?
Less often than you might expect, and the answer depends on the time frame.
Morningstar's year-end 2024 Active/Passive Barometer covered 3,200 active funds. In 2024, 42% survived and outperformed their average passive peer. Over the 10 years ended December 2024, less than one out of every four did.2
Morningstar calls one year an insufficient time horizon, because success rates can swing wildly with what markets are doing. Longer horizons give a stronger signal.2
It is not all the same
Long-term success rates were highest among bond and real estate funds, where Morningstar says active management may have the upper hand.2 In US large-cap categories, the distribution of excess returns skews heavily negative.2
So the honest takeaway is not "index funds always win." It is "the odds depend on the category, the cost and how long you hold."
Survival is a hurdle
Morningstar's Jeffrey Ptak notes that about 38% of the active funds in the report started but did not finish the 10 years, because they merged into another fund or were liquidated.3 You cannot beat the passive alternative if your fund is gone.
His data also show that roughly half of the priciest funds did not survive, and the cheapest died about a third less often.3
Why does cost keep coming up?
Because it is the one variable you can see before you buy.
Morningstar found that the average surviving active large-blend fund lagged the passive composite by about 1.9% per year over the 10 years ended December 31, 2024. Its explanation is blunt: funds often still charge too much for the value they can produce before fees.3
Even small differences in fees can translate into large differences in returns over time.
The SEC also states that a fund with high costs must perform better than a low-cost fund to generate the same returns for you.4 Operating expenses are paid out of fund assets and show up as the expense ratio, which you can find in the fund's prospectus fee table.7
I covered the SEC's own fee example in the basics piece, so I will not repeat it here. Instead, here is what a gap of that size could look like with monthly contributions.
That is a hypothetical, not a prediction. I picked 5% to keep the arithmetic simple, and I took 1.9 points off because that is the average shortfall Morningstar measured over ten years for one category. The point is the order of magnitude: a gap that sounds small becomes more than $119,000 over three decades.
What does compounding do with regular contributions?
It rewards time more than it rewards cleverness. Money you add early gets the most years to build on.
Look at the shape. Going from 10 to 20 years more than doubles the result. The final decade adds more than the first two combined. Real returns will not run in a straight line, and some years will be negative, so run your own scenarios in the SEC's free compound interest calculator, and try a lower rate than the one you hope for.6
What fees are you actually paying?
The SEC splits them into two types. Transaction fees hit each time you buy, sell or exchange: commissions, markups and markdowns, and sales loads. Ongoing fees hit regularly: advisory fees, a fund's annual operating expenses, retirement plan fees and, for variable annuities, annual fees.7
You can pay both layers at once. A retirement plan may pass along its own administration costs on top of the expenses of the funds inside it.7 That is why I ask for the all-in number, not just the headline.
Where do you find them? In the fund's prospectus fee table, your account statements, and the fee schedule of whoever holds your account.7 Read them before you fund anything, not after.
What does a down year feel like?
Worse than the spreadsheet says. The SEC's beginner guide notes that large company stocks as a group have lost money on average about one out of every three years, and that investors willing to ride out the swings over long periods have generally been rewarded.5
That is history, not a promise. But it tells you what to plan for: you will see red numbers, and your plan has to survive them.
Write the rule before the drop
Decide in advance what you will do when your balance falls 20%. Write it down. For most owners, the correct answer is "nothing, and keep the automatic contribution running," but I would rather you choose that on a calm Tuesday than in the middle of a headline. A plan you only follow when it feels good is not a plan.
Separate the money by job
Money you need within a few years does not belong where a down year could force a sale. That is the whole reason the cash buffers come first. Long money can wait out a bad year because it has time, and the SEC says time horizon and risk tolerance drive your mix.5
How does this work with lumpy owner income?
Automate against a fixed base and treat the rest as a windfall with a pre-set split. The lifestyle creep rule shows how, and it keeps the investing contribution from depending on how you feel that month.
Regular contributions also do something useful during a drop: the same dollar amount buys more shares when prices are lower. That is not a trick that produces a gain, but it removes the temptation to time the market.
Where does diversification fit?
Index funds can help with it, but a fund is not automatically diversified.
The SEC says a total stock market index fund, for example, owns stock in thousands of companies, while a fund focused on one industry sector does not give you instant diversification.5 More funds can also mean more fees.5
Richard Coffin of The Plain Bagel made a related point about the S&P 500 in a video posted on March 1, 2024: "While you might view yourself as a passive investor you are still making some active bets."8 Choosing an index is a choice, and it comes with its own concentration. That is why reading what a fund holds matters.
VideoThe Plain Bagel
Is the S&P 500 Too Concentrated?
A calm look at how concentrated the S&P 500 had become and what alternatives exist; it is general education, not advice.
Your business is already a concentrated bet on one company. That means the money you invest outside it has a different job, and I would want it spread out. For the definitions, the basics article covers them.
How do you decide, practically?
- Finish the foundation. Cash reserves and the right insurance come first, as the two-cash-buffers piece explains.
- Name the goal and the timeline. Retirement in decades and a purchase in two years are different jobs.
- Pick the account. For owners, the options are laid out in Solo 401(k) vs SEP IRA.
- Ask the cost questions. Expense ratio, other fees, and how the person advising you gets paid.7
- Ask what it holds and what can go wrong. The SEC suggests reading the prospectus and most recent shareholder report.1
- Automate. Same amount, same day.
- Review annually and rebalance rarely. Rebalancing brings your mix back to your original allocation after some holdings outgrow others.5
What should make you walk away?
- A promised return. Anyone who promises a result and skips the risks is selling, not teaching.
- A fee nobody will itemize. The SEC tells investors to read the disclosure documents and ask questions.7
- Complexity you cannot explain. If you cannot tell a friend how it makes money, wait.
- Urgency. A sound plan is still sound tomorrow.
I do not need the best investment. I need one boring enough that I will still be doing it in year fifteen.
My grandmother's question, So what's your retirement plan?, was never about picking winners. It was about having something that survives my own enthusiasm.
I will keep this section free of product picks. Education is the job, and the final decision belongs to you and a licensed professional who tells you how they are paid. More of the series lives in Investing and Retirement.
Keep building.Ekai
Questions people ask
Do index funds beat active funds?
Over long periods, usually, though not in every category. Morningstar found that less than one in four active funds beat the average of their passive peers over the 10 years ended December 2024, while 42% did so in 2024 alone.
What is an index fund?
The SEC describes it as a type of mutual fund or exchange-traded fund that seeks to track the returns of a market index. You cannot invest directly in an index, so an index fund gives you an indirect way to hold a similar basket of securities.
Are index funds always cheaper?
No. The SEC says passive management may save costs, but not all index funds have lower costs than actively managed funds. Check the fee table in the prospectus.
Why do costs matter if the percentages look small?
Costs come out every year and shrink the base that compounding works on. Morningstar found that the average surviving active large-blend fund lagged its passive composite by about 1.9% a year over 10 years, which compounds into a large gap over decades.
Is compounding certain?
No. Returns vary and can be negative. Any compounding example is hypothetical and only shows how time and consistency work if a steady rate were earned.
Sources
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