What Is Portfolio Rebalancing?
In plain English
Portfolio rebalancing is the process of restoring your investment portfolio to its original target asset allocation after market movements have caused it to drift. For example, if stocks rally and bonds decline, a 60/40 portfolio may drift to 70/30. Rebalancing involves selling some of the overweighted assets and buying the underweighted ones to return to the target, maintaining your intended risk level.
How Often Should You Rebalance Your Portfolio?
Most financial planners recommend rebalancing annually or when any asset class drifts more than 5 percentage points from its target. Annual rebalancing is simple and effective. More frequent rebalancing may improve risk control but increases transaction costs and potential tax consequences. Many target-date funds and robo-advisors rebalance automatically, removing the need for manual action.
What Are the Best Methods for Rebalancing?
The cleanest method is selling overweighted assets and using proceeds to buy underweighted ones, but this can trigger capital gains taxes in taxable accounts. A tax-friendlier approach is directing new contributions to underweighted assets until balance is restored. In tax-advantaged accounts like IRAs or 401(k)s, you can rebalance freely without tax consequences. Some investors use a combination of both methods.
Why Is Rebalancing Considered Forced Discipline?
Rebalancing enforces a counterintuitive but effective behavior: it forces you to sell assets that have recently performed well and buy assets that have recently underperformed. This is effectively a systematic buy-low, sell-high mechanism. It counters the emotional tendency to chase recent winners and abandon laggards. Investors who skip rebalancing often find their portfolios taking far more risk than intended after extended bull markets.
Frequently asked questions
Does rebalancing improve investment returns?
Rebalancing primarily manages risk rather than maximizing returns. In some market environments, especially volatile ones with mean-reverting assets, rebalancing adds a modest return bonus called the rebalancing premium. However, its primary purpose is ensuring your portfolio risk stays aligned with your tolerance and goals, not chasing maximum returns.
Should you rebalance during a market crash?
Yes — and it is one of the most effective times to do so. If your stocks fall and your bonds hold value, your portfolio will underweight stocks. Rebalancing means buying stocks after a crash at lower prices, which historically leads to strong returns during the recovery. This disciplined behavior is difficult emotionally but financially rewarding.
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Related terms
Asset Allocation
Asset allocation is how you divide your investment portfolio among different asset classes like stocks, bonds, and cash. Your allocation is the single biggest driver of your portfolio's long-term risk and return.
Diversification
Diversification means spreading investments across different assets, sectors, and geographies to reduce risk. It reflects the principle of not putting all your eggs in one basket.
Bond
A bond is a fixed-income investment where you lend money to a government or corporation in exchange for regular interest payments and the return of principal at maturity. Bonds are typically lower-risk than stocks.
Stock
A stock represents a share of ownership in a company. When you buy stock, you become a part-owner of that business and can benefit from its growth through price appreciation and dividends.
Robo-Advisor
A robo-advisor is an automated digital investment platform that builds and manages a diversified portfolio on your behalf based on your goals and risk tolerance. Robo-advisors offer professional-grade portfolio management at very low cost.
Index Fund
An index fund is a type of investment fund that tracks a specific market index, like the S&P 500. It offers broad diversification at very low cost and is a cornerstone of passive investing.