Portfolio Rebalancing

Portfolio rebalancing is a core investment management practice. When you initially set your asset allocation, perhaps 60% stocks and 40% bonds, you establish a risk profile that reflects your goals, time horizon, and risk tolerance. Over time, however, different asset classes perform differently. A strong stock market may push your allocation to 70% stocks and 30% bonds, increasing your portfolio's risk beyond your comfort level. Rebalancing brings the portfolio back to the intended mix.

There are several approaches to rebalancing. Calendar-based rebalancing involves reviewing and adjusting your portfolio on a set schedule, such as quarterly or annually. Threshold-based rebalancing triggers adjustments when any asset class drifts beyond a predetermined range (for example, if stocks exceed 65% or fall below 55% of the portfolio). Some investors use a combination of both approaches.

Rebalancing is inherently a contrarian strategy. It requires selling assets that have performed well (and may feel like they will continue to rise) and buying assets that have underperformed (which may feel uncomfortable). This discipline, while counterintuitive, is designed to maintain your risk level and may improve long-term risk-adjusted returns by systematically buying low and selling high across asset classes.

Tax considerations are important when rebalancing in taxable accounts. Selling appreciated investments may trigger capital gains taxes. Strategies to minimize the tax impact include rebalancing within tax-advantaged accounts (IRAs, 401(k)s) where trades do not trigger taxes, directing new contributions to underweight asset classes, using dividends and interest to purchase underweight assets, and pairing rebalancing trades with tax-loss harvesting opportunities.

The frequency and method of rebalancing should reflect your personal circumstances. Rebalancing too frequently may generate unnecessary transaction costs and taxes, while rebalancing too infrequently may allow your portfolio to drift materially from your intended risk level. Annual or semi-annual reviews, combined with threshold-based triggers for significant market movements, represent a commonly recommended approach.