What Is a Portfolio?

Your portfolio is the collection of investments you own—stocks, bonds, ETFs, mutual funds. A well-built portfolio is diversified: you don't put all your money in one company or one sector. If one investment drops 30%, others may hold up. Diversification won't eliminate risk, but it reduces the impact of any single failure.

Asset Allocation

Asset allocation is how you split your money between stocks and bonds. It's one of the most important decisions you'll make—often more important than picking individual investments.

• More stocks — Higher potential return, higher volatility. Good for long time horizons (10+ years). Historical average: roughly 10% per year, with big swings.
• More bonds — Lower volatility, lower return. Good for stability, income, and when you're closer to needing the money.
• Rule of thumb — "110 minus your age" for stock allocation: a 30-year-old might hold 80% stocks, 20% bonds. A 60-year-old might hold 50% stocks, 50% bonds. Adjust based on your risk tolerance and goals.

A Simple Three-Fund Portfolio

You don't need dozens of funds. A classic three-fund setup works for most people:

1. U.S. stocks — VTI (Total Stock Market) or VOO (S&P 500). Captures the broad U.S. market.
2. International stocks — VXUS or VTIAX. Exposure to companies outside the U.S. Reduces concentration risk.
3. Bonds — BND or VBTLX. Stability and income. Helps cushion downturns.

Example for a 35-year-old with moderate risk tolerance: 60% VTI, 25% VXUS, 15% BND. You can simplify further with VT (Total World) plus BND if you prefer.

How to Start

1. Decide your allocation — Based on age, goals, and how much volatility you can stomach.
2. Open an account — IRA or 401(k) first, taxable brokerage if you've maxed those.
3. Buy funds in proportion — If you have $1,000 and want 60% U.S. / 25% international / 15% bonds, buy $600 VTI, $250 VXUS, $150 BND.
4. Set up auto-investing — Many brokers let you schedule automatic purchases. Consistency beats perfection.

Rebalancing

Over time, your allocations will drift. If stocks outperform, you'll have more in stocks than you planned. Rebalancing means selling some of the winners and buying more of the laggards to get back to your target mix. Benefits: you're forced to "buy low, sell high" in a disciplined way.

• Do it once a year (e.g., on your birthday), or when allocations drift by more than 5%.
• In tax-advantaged accounts (IRA, 401k), rebalancing doesn't trigger taxes. In taxable accounts, use new contributions to rebalance when possible to avoid selling and triggering capital gains.

Example: Sarah's Portfolio

Sarah is 40, has $50,000 to invest, and wants 65% stocks, 35% bonds. She buys $32,500 in VTI (U.S. stocks), $8,125 in VXUS (international), and $17,500 in BND (bonds). She sets up a monthly auto-invest of $500 split the same way. Every January, she checks her balance: if stocks are over 70%, she'll sell some and buy bonds to get back to 65/35.