How to Choose a Mutual Fund

The right mutual fund is almost always boring. It is a broadly diversified, passively managed index fund with an expense ratio under 0.20%, no load, no 12b-1 fee, and a minimum investment you can meet. Anything more exotic is usually worse on every measure that matters. This guide walks through the six filters that narrow 7,000 mutual funds down to the 30 worth considering.

What a Mutual Fund Actually Is

A mutual fund pools money from many investors and uses it to buy a basket of securities (stocks, bonds, or both). You buy shares in the fund. Each share represents a tiny slice of the basket.

Mutual funds price once per day, after the market closes at 4:00pm ET. All buy and sell orders that came in during the day execute at that day's net asset value (NAV). This is different from ETFs, which trade continuously throughout the day like stocks.

There are roughly 7,000 US mutual funds in 2026 holding $25 trillion in assets. Most are mediocre. A small number are excellent and cheap. The rest exist to generate fees for the fund company, not returns for you.

The good news: choosing well is easier than the menu suggests. A short list of filters eliminates 95% of the choices instantly.

Step 1: Pick the Asset Class First

The single biggest determinant of your return is your mix of asset classes, not the specific fund. Decide whether you want stocks, bonds, or a blend before you compare specific funds.

| Asset Class | When to Use | Typical Long-Term Return | |-------------|-------------|--------------------------| | US total stock market | Core growth, all timelines 5+ years | ~7% real | | International stocks | Diversification beyond US | ~6% real | | US bonds | Stability, money needed in 3 to 10 years | ~2% real | | Cash / money market | Money needed in under 1 year | ~0% real (matches inflation) | | Target-date fund | Single-fund retirement portfolio | Blended (8%/2% mix shifts over time) |

A 30-year-old saving for retirement might be 100% in a US total stock market index fund. A 60-year-old might be 60% stocks and 40% bonds. A 25-year-old saving for a house in 3 years should be in a high-yield savings account, not a stock fund.

For the longer treatment, see how to invest in index funds and the investing hub.

Step 2: Restrict to Index (Passive) Funds

Mutual funds split into two camps:

• Active funds. A manager picks stocks trying to beat a benchmark index. Average expense ratio 0.66% in 2026, with many over 1.00%.
• Passive (index) funds. The fund mechanically holds every stock in a target index. Average expense ratio 0.06%, with several at 0.00%.

The SEC and academic researchers have studied this question for 50 years. The consistent result, summarized at investor.gov:

• About 90% of active funds underperform their benchmark index over 20 years.
• The few that beat the index in one decade rarely beat it in the next.
• High past returns do not predict future returns.
• Low fees do predict future returns. The cheapest 25% of funds in a category outperform the most expensive 25% with high reliability.

The takeaway: do not try to find the active manager who will beat the index. Buy the index directly. It is cheaper, simpler, and wins about 90% of the time.

Set your brokerage's fund screener to "Index funds only" before doing anything else.

Step 3: Reject Loads and 12b-1 Fees

Some mutual funds charge fees that go to the seller of the fund, not to managing the investments. There is no evidence that fee-charging funds outperform no-fee funds.

The fees to filter out:

• Front-end load (Class A shares). Up to 5.75% is taken from your initial deposit. A $10,000 deposit becomes $9,425 invested. You need to make 6% just to break even.
• Back-end load (Class B or C shares). A fee taken when you sell, usually declining over 5 to 8 years.
• 12b-1 fee. An annual marketing fee up to 1.00% baked into the expense ratio, ostensibly for advertising the fund.
• Redemption fee. A small fee (often 0.50% to 2.00%) for selling within a short window (30 to 90 days).

Set your brokerage's screener to "No-load funds only" and "No 12b-1 fee." This eliminates most of the funds your bank or insurance agent will try to sell you.

Vanguard, Fidelity, and Schwab funds are no-load by default. Funds from American Funds, Putnam, MFS, and Franklin Templeton frequently have loads. None of those load funds reliably outperform their no-load Vanguard equivalents.

Step 4: Set the Expense Ratio Filter

The expense ratio is the annual fee the fund charges, expressed as a percentage of assets. A 0.50% expense ratio on a $100,000 balance costs $500 a year, every year, taken directly from your fund value.

Reasonable expense ratios by category:

| Category | Reasonable | Good | Excellent | |----------|-----------|------|-----------| | US total market index | Under 0.20% | Under 0.10% | 0.00% to 0.04% | | S&P 500 index | Under 0.10% | Under 0.05% | 0.00% to 0.03% | | International stock index | Under 0.20% | Under 0.10% | Under 0.08% | | US bond index | Under 0.10% | Under 0.05% | Under 0.03% | | Target-date fund | Under 0.20% | Under 0.15% | Under 0.08% | | Active US stock fund | Under 0.80% | Under 0.60% | Under 0.40% |

Compounded over 40 years, a 1.00% expense ratio costs roughly 30% of your final balance. A 0.05% expense ratio costs less than 2%. The fee compounds against you the same way the returns compound for you.

Use the compound interest calculator to see what a fee difference does to your end balance. The math is brutal and one-sided.

Step 5: Confirm the Holdings Are Broadly Diversified

A good core fund holds at least several hundred stocks across many sectors. Check the fund's holdings page or fact sheet for:

• Number of holdings. Total US market index funds hold 3,000+ stocks. S&P 500 funds hold 500. Sector or theme funds hold 30 to 100.
• Sector concentration. A diversified fund has no single sector above 30% of assets. If technology is 45% of the fund, you are concentrated.
• Top 10 holdings. In a broad index, the top 10 holdings represent 20% to 30% of assets. In a concentrated fund, they may represent 60%+.
• Geographic concentration. US-only is fine if you also own an international fund. A "global" fund should hold both.

Avoid the following for your core portfolio:

• Sector funds (technology, energy, healthcare). Higher fees, worse risk-adjusted returns.
• Theme funds (clean energy, AI, blockchain). Marketing-driven, often launched at the peak.
• Country-specific funds (Brazil, Vietnam). High fees, narrow exposure.
• Leveraged or inverse funds. Designed for traders, terrible for long-term holders due to volatility decay.

A total US market index plus an international index plus a bond index covers 99% of investors for life.

Step 6: Check the Minimum and the Share Class

Mutual funds often have multiple share classes of the same fund with different fees and minimums:

| Vanguard Total Stock Market | Min | Expense Ratio | |-----------------------------|-----|---------------| | Investor Shares (VTSMX) | Discontinued | n/a | | Admiral Shares (VTSAX) | $3,000 | 0.04% | | ETF (VTI) | 1 share (~$280) | 0.03% |

If you cannot meet the Admiral minimum, the ETF version is a perfectly good substitute with no minimum and a slightly lower fee. Most Vanguard, Fidelity, and Schwab funds come in both mutual fund and ETF forms.

A practical rule:

• Retirement account, monthly contributions: Use the mutual fund. Automatic recurring purchases of round dollar amounts ($100, $250) are easy with mutual funds, harder with ETFs at some brokerages.
• Taxable account, lump sum purchase: Use the ETF. Better tax efficiency, no minimum.

See how to open a Roth IRA and how to open a brokerage account for setup.

Funds Worth Considering by Category

A short list of well-known, low-cost mutual funds that pass all six filters.

| Goal | Vanguard | Fidelity | Schwab | |------|----------|----------|--------| | Total US stock market | VTSAX (0.04%) | FZROX (0.00%) | SWTSX (0.03%) | | S&P 500 | VFIAX (0.04%) | FXAIX (0.015%) | SWPPX (0.02%) | | Total international | VTIAX (0.11%) | FZILX (0.00%) | SWISX (0.06%) | | US bond market | VBTLX (0.05%) | FXNAX (0.025%) | SWAGX (0.04%) | | Target-date 2060 | VTTSX (0.08%) | FDKLX (0.12%) | SWYNX (0.08%) |

Any of these is a defensible choice. Pick the one available at the brokerage where your account already lives.

The regulatory backdrop is straightforward. The SEC requires every fund to publish a prospectus with the expense ratio, holdings, and fee structure. FINRA regulates how funds can be sold. The protections work as designed, but they will not stop you from buying a high-fee fund. The filters in this article will.

Choose one fund. Buy it monthly. Hold it for 30 years. That is most of investing.