Why Rebalancing Matters When the Market Is At Record Highs

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  Published in Stocks and Investing on Friday, November 28th 2025 at 0:29 GMT by Post and Courier
      Locale: UNITED STATES

Rebalancing Your Portfolio in a Lofty Market: A Practical Guide

When the market is in the green, it’s easy to get swept up in the momentum. The stock market’s recent surge—record highs on the S&P 500, strong corporate earnings, and a backdrop of low interest rates—has made many investors feel confident that their equity‑heavy portfolios are on the right track. However, the very same conditions that drive gains can also create excess risk, and that’s where portfolio rebalancing comes into play. The Post & Courier’s AP‑written piece “How to Rebalance Your Portfolio in a Lofty Market” (published early 2024) breaks down why rebalancing matters, how to do it, and what tools you can use to keep your investments aligned with your long‑term goals.

Why Rebalance When the Market Is High?

1. Protecting Gains
   In a bull market, the value of equities tends to grow faster than that of bonds or cash. If you hold a portfolio that was initially 60 % stocks and 40 % bonds, a 30 % rise in equities could bump your allocation to 70 % stocks—double the original target. That overweight exposure means you’ll be riding a hotter train, and if the market turns, you’ll be on the back seat.

2. Maintaining Risk Tolerance
   Your original asset‑allocation decision was based on your risk profile, time horizon, and financial goals. A market rally can unintentionally shift that profile—higher equity exposure increases volatility, and your portfolio may now be less able to weather a downturn than you’re comfortable with.

3. Enforcing Discipline
   Rebalancing forces you to step back, evaluate your holdings, and make decisions based on objective criteria instead of emotions. The AP article highlights a common cognitive bias—“the market‑timing illusion”—that often leads investors to hold onto winners and sell losers. Rebalancing keeps you from being caught in that trap.

The Step‑by‑Step Process

The article outlines a simple yet robust four‑step rebalancing routine that can be implemented quarterly or annually:

The article’s authors stress the importance of regularity: “Make rebalancing a habit, not an ad‑hoc event.” An automated rebalancing plan offered by most robo‑advisors—like Betterment or Wealthfront—can keep you on track without manual effort.

Special Considerations in a Lofty Market

• Tax‑Loss Harvesting
  The Post & Courier article links to an AP piece on “Tax‑Loss Harvesting 101”, explaining that when you sell a losing position, you can offset capital gains in other parts of your portfolio. In a market that’s been highly lucrative, you may have many gains to offset. Combining rebalancing with loss harvesting can reduce your tax bill.

• Liquidity Needs
  If you anticipate a major expense (e.g., college tuition, a home renovation), the article advises keeping a small cash buffer. Rebalancing shouldn’t strip you of liquidity. Consider shifting some over‑weighted equities into short‑term Treasury bills or high‑yield savings if you need cash in the next 12–18 months.

• Rebalancing Thresholds
  The piece recommends a threshold of 5 % (i.e., if your allocation deviates by more than 5 % from the target) for most investors. However, if you’re a high‑risk investor, you might tolerate a 10 % deviation to avoid frequent trading. The key is to choose a threshold that aligns with your trading costs and tax situation.

• Using ETFs and Index Funds
  The article showcases several ETFs that are ideal for rebalancing: SPY (S&P 500), VTI (total U.S. stocks), BND (aggregate bonds), and AGG (U.S. Treasury bonds). It notes that ETF commissions are often negligible, especially with “no‑load” accounts.

The Broader Context

Beyond the mechanics, the article situates rebalancing in a larger conversation about long‑term investing. It cites the Bogleheads guide—linked within the piece—which emphasizes diversification, low costs, and a “buy‑and‑hold” mindset. In a lofty market, the temptation to chase the latest hot sector is strong, but rebalancing keeps you grounded in a diversified strategy.

The authors also reference research from the Journal of Portfolio Management, which finds that investors who rebalance annually outperform those who hold onto a static mix by about 0.5 %–1.0 % per year—an advantage that compounds over decades.

Practical Takeaways

1. Determine Your Target: Use a risk‑tolerance model (e.g., Rule of 120) and adjust as you age or your financial goals change.
2. Schedule Rebalancing: Quarterly or annually—whichever suits your costs and comfort level.
3. Use Automation: Robo‑advisors or brokerage rebalancing tools reduce friction.
4. Consider Taxes: Harvest losses and sell long‑held gains first if you want to reduce tax impact.
5. Keep Liquidity: Maintain a small cash buffer for near‑term needs.
6. Review Thresholds: 5 % deviation is a common rule; adjust based on your risk appetite.

Closing Thoughts

The Post & Courier’s article serves as a clear, actionable guide for investors navigating a market that’s too good to ignore. By systematically realigning your portfolio to your original target allocation, you lock in gains, manage risk, and preserve the discipline that long‑term investing demands. In a lofty market, the temptation is to stay put and ride the wave; rebalancing reminds you that the best strategy is to keep your feet firmly planted in the shore, no matter how high the tide rises.