How to Rebalance Your Portfolio

Strategy & FAQ · October 17, 2026

A portfolio built five years ago with a 60% stock and 40% bond split can drift to roughly 72% stock after a strong run in equities. That quiet shift means you are carrying more risk than you signed up for, often without realizing it. If your stock sleeve has grown from $60,000 to about $114,000 while your bond sleeve barely moved, your mix is out of date.

Rebalancing is the practice of nudging that mix back toward your target. It is not about predicting the market. It is about keeping your risk level where you want it, year after year.

Pick a trigger before you need one

The easiest system is a calendar. Many people check their allocation once a year, often around a birthday or tax season, and adjust if it has drifted. A stronger system combines the calendar with a threshold: rebalance when any slice is off by roughly 5 percentage points from its target. That might mean acting once every year or two in calm markets, and a few times in a choppy one. The calendar alone keeps you honest; the threshold keeps you from tinkering too often.

Two ways to get back to target

You can rebalance by selling the overweight part and buying the underweight part, or you can steer new money toward whatever is light. The sell-and-buy method is direct and gets you to target in a single afternoon, but it can create a tax bill if you sell winners in a taxable account. The new-cash method is gentler on taxes because you simply direct your next few paycheck contributions into bonds until the mix straightens out. For most people with steady savings, the contribution method is the calmer path; for someone sitting on a lump sum with a badly skewed mix, the direct trade is faster.

A pie chart splitting a portfolio between stocks, bonds, and cash

The catch

Rebalancing is not free. Every trade can carry a fee, and selling appreciated holdings in a taxable account can trigger capital gains tax. In most years the drag is small, but if you rebalance quarterly out of nerves, the costs can quietly eat a percentage point or two of your return. The fix is to rebalance in tax-advantaged accounts where possible, and to use the contribution method in taxable ones.

Automate the boring part

Several low-cost brokerage setups let you turn on automatic rebalancing, where the platform nudges your allocation back on a schedule you set. This removes the temptation to wait for a "better" moment that never comes. If your plan offers it, switch it on with a once-a-year target date.

What to do this week

  1. Write down your current target mix, such as 60% stocks and 40% bonds, on a single note.
  2. Log in and record your actual mix as of today, rounded to the nearest percentage point.
  3. If any slice is off by about 5 points or more, schedule the trade or redirect next month's contribution to close the gap.

Don't overthink the perfect timing

There is no magic month to rebalance. People who wait for the "right" moment usually wait through a full market cycle and end up with a mix that no longer fits them. A simple annual check, paired with a threshold rule, keeps your risk steady without turning investing into a part-time job. The goal is not to win the next quarter. The goal is to stay invested at a risk level you can live with when the next downturn arrives.

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