The 3-fund portfolio is one of the simplest complete investment plans there is. You own three broad index funds and nothing else:
- U.S. stocks: the whole U.S. market, large and small companies.
- International stocks: developed and emerging markets outside the U.S.
- Bonds: high-quality U.S. bonds to cushion the stock swings.
Together that's thousands of stocks and bonds, for a combined fee that can be close to zero.
The tickers at each brokerage
| Brokerage | U.S. stocks | International | Bonds |
|---|---|---|---|
| Vanguard | VTI (0.03%) | VXUS (0.05%) | BND (0.03%) |
| Fidelity | FZROX (0.00%) | FZILX (0.00%) | FXNAX (0.025%) |
| Schwab | SCHB (0.03%) | SCHF (0.03%) | SCHZ (0.03%) |
Expense ratios as of September 2026; confirm on each fund's page before buying. Two notes: Vanguard's lineup is ETFs that can be held at almost any broker. Fidelity's ZERO funds are mutual funds that can only be held at Fidelity. Schwab's SCHF covers developed markets only; add an emerging-markets fund if you want those too.
Setting the mix
The three funds are the easy part. The decision that actually drives your results is how much goes in each:
- Stocks vs bonds sets how bumpy the ride is. More bonds means smaller drops and lower expected long-run returns. People often hold more bonds as they get closer to needing the money.
- U.S. vs international is a judgment call. A common range is 20% to 40% of the stock portion in international.
An example only, not a recommendation: a long-horizon investor might use 60% U.S. stocks, 30% international stocks and 10% bonds. Once a year, rebalance back to your targets.
Why it works
It's cheap, broadly diversified, and hard to mess up. There's nothing to monitor except your target mix. The main way it fails is behavioral: selling in a downturn or abandoning it to chase whatever is hot.
Educational only, not investment advice.