What Is an Index Fund?
An index fund is a type of mutual fund or ETF (exchange-traded fund) that tracks a market index — like the S&P 500 (the 500 largest US companies) or the Total Stock Market index (essentially every publicly traded US company). Instead of a manager picking which stocks to buy, the fund simply buys all the stocks in the index proportionally.
This "passive" approach has two major advantages: lower costs (no expensive managers) and reliable market returns — you get exactly what the market delivers, no better, no worse.
Why They Outperform Most Active Funds
Over long time horizons, approximately 80–90% of actively managed funds underperform their benchmark index after fees. The reasons are well-documented:
- Active funds charge higher fees (often 0.5–1.5% annually vs. 0.03–0.20% for index funds)
- Markets are highly efficient — consistent stock-picking skill is rare and doesn't persist
- Compounding amplifies fee differences dramatically over decades
Common Index Funds You'll See in Your KC 401(k)
| Fund Type | What It Tracks | Risk Level |
|---|---|---|
| S&P 500 Index Fund | 500 largest US companies | Medium-High |
| Total US Stock Market Fund | All US public companies | Medium-High |
| International Index Fund | Stocks outside the US | Medium-High |
| Bond Index Fund | Government/corporate bonds | Low-Medium |
| Target-Date Fund (e.g. 2055) | Mix of the above, auto-adjusting | Varies by year |
Target-Date Funds: The Simplest Starting Point
If you don't want to think about allocation at all, a target-date fund is an excellent default. Pick the fund with the year closest to when you'll retire (e.g., "2055 Fund" if you'll retire around 2055). The fund automatically holds a diversified mix of stocks and bonds and gradually shifts to a more conservative allocation as you approach the target date.
Target-date funds typically hold index funds internally — so you're getting low-cost diversification without any ongoing management decisions.
How to Invest in Index Funds at KC
Log into your KC 401(k) portal and look at your current fund allocation. If you're in a money market or stable value fund — common defaults — consider switching to an S&P 500 or target-date index fund appropriate for your age. The difference in expected long-term returns is significant.
For accounts outside your 401(k) (Roth IRA, taxable brokerage), major brokerages like Fidelity, Vanguard, and Schwab all offer commission-free index funds with very low expense ratios.