Portfolio Rebalancing: Why It Matters and How to Do It

Imagine you started with 60% stocks and 40% bonds — a balanced portfolio. After a great stock market run, your portfolio is now 80% stocks and 20% bonds. You're taking on more risk than you planned. Rebalancing fixes this — and it can actually boost returns over time.

What Is Portfolio Rebalancing?

Rebalancing is the process of realigning your portfolio back to your target asset allocation. When stocks outperform, they become a larger percentage of your portfolio. Rebalancing means selling some stocks and buying bonds (or whatever lagged) to restore your original mix.

Why Rebalancing Matters

• Manages risk — prevents your portfolio from becoming riskier than intended as markets shift
• Forces you to sell high and buy low — you sell what's grown and buy what's lagged
• Maintains your investment strategy — keeps emotions from driving decisions
• Can improve risk-adjusted returns — studies show rebalanced portfolios often outperform unbalanced ones

When to Rebalance

• Calendar-based: Rebalance once or twice per year (January + July is common)
• Threshold-based: Rebalance when any asset class drifts 5% from target (e.g., stocks hit 65% in a 60/40 portfolio)
• Hybrid: Check annually, rebalance only if drift exceeds 5%

How to Rebalance Without Selling

If you're still contributing, direct new contributions to underweight asset classes first. This rebalances without triggering taxable events. In tax-advantaged accounts (IRA, 401k), you can sell and rebuy freely without tax consequences — rebalance aggressively there.

Target-Date Funds: Auto-Rebalancing

Target-date funds (like Vanguard's 2050 fund) rebalance automatically and gradually shift from stocks to bonds as you approach retirement. They're a set-it-and-forget-it solution for investors who don't want to manage allocation manually.