The 3-Fund Portfolio Explained

By Built By One Editorial Team · Published 2026-03-09 · Last updated 2026-09-01

The simplest, most effective investing strategy for building long-term wealth.

What Is a 3-Fund Portfolio?

A 3-fund portfolio is an investment strategy that uses just three index funds to create a diversified, low-cost portfolio. It was popularized by Bogleheads—followers of Vanguard founder John Bogle.

The Three Funds

• US Total Stock Market Index Fund — Covers the entire US stock market
• International Stock Market Index Fund — Provides global diversification
• US Total Bond Market Index Fund — Adds stability and income

Why It Works

• Low costs: Index funds have minimal expense ratios
• Broad diversification: You own thousands of stocks and bonds
• Simplicity: Easy to manage and rebalance
• Tax efficiency: Low turnover means fewer taxable events

Recommended Allocations by Age

• 20s-30s: 60% US Stocks, 30% International, 10% Bonds
• 40s-50s: 50% US Stocks, 25% International, 25% Bonds
• 60s+: 40% US Stocks, 20% International, 40% Bonds

Tools we use to build this

Before you add risk, know what your credit is costing you: WalletHub Premium shows free 3-bureau scores and alerts, so a high-interest debt does not quietly outrun your returns. If part of your allocation is physical metals, Silver Gold Bull prices gold and silver bullion with insured shipping and a best-price guarantee. Both are affiliate links — see our affiliate disclosure.