What it means
When you invest money, you typically divide it among different types of assets based on your goals and comfort with risk, such as safer bonds and riskier shares. Over time, certain investments will grow faster than others.
If shares perform exceptionally well, they will make up a much larger portion of your portfolio than you originally intended, unintentionally exposing you to higher risk than you planned to take. Rebalancing means stepping in to fix this imbalance.
You sell some of the investments that have grown significantly and use the cash to buy more of the assets that have lagged behind. This disciplined approach forces you to automatically follow the golden rule of investing: sell high and buy low.
For non-finance managers and business leaders, this concept applies directly to managing corporate treasuries or personal wealth. Without regular check-ins, a portfolio becomes heavily concentrated in whatever asset happened to perform best recently.
Rebalancing brings everything back to a safe, intentional baseline. Most people rebalance their portfolios on a calendar schedule, such as every six months or once a year, or when an asset class drifts by a specific threshold, like five percentage points from the target.
It is a vital maintenance routine to ensure your money works hard without taking on accidental risks.
In practice
Real-world examples.
Example
An entrepreneur with a target of 60 percent shares and 40 percent cash sees their shares grow until they represent 80 percent of the total value, prompting them to sell shares and restore the 60/40 split.
Example
A growing SME maintains an investment reserve split equally between government bonds and corporate equities. After a market boom, equities dominate, so the finance team trims them to buy more bonds.
Example
A tech startup founder with a personal retirement portfolio initially split between property funds and global shares rebalances annually to ensure neither asset class dominates their net worth.
Think of it
“Think of it like a rowboat. If everyone on board crowds to one side because they see something shiny, the boat tilts dangerously. Rebalancing is simply moving people back to their proper seats to keep the boat level and safe.
Formula
Calculation
Target Value = Total Portfolio Value multiplied by Target Percentage.
Example: If your total portfolio is worth 100,000 pounds and your target for shares is 60 percent, your target value is 100,000 multiplied by 0.60, which equals 60,000 pounds. If your actual shares are currently worth 75,000 pounds, you must sell 15,000 pounds of shares to rebalance.Case study
Seen in the real world.
BrightSpark Logistics held a surplus reserve of 500,000 pounds intended for future expansion. The finance committee set a conservative policy of 50 percent low-risk corporate bonds and 50 percent equity index funds. Over two consecutive years, the equity funds surged, pushing the stock portion to 70 percent of the total reserve, while bonds made up only 30 percent. Realising the business was now exposed to much higher market volatility than approved by the board, the finance manager initiated a rebalancing procedure. They sold 100,000 pounds worth of equity funds and reinvested the proceeds into corporate bonds. This brought the portfolio back to the target 50/50 split, protecting the company reserve from a subsequent market downturn.
Watch out
Common mistakes.
- Rebalancing too frequently, which racks up unnecessary transaction fees and tax liabilities.
- Panicking during a market drop and selling low instead of sticking to the long-term target.
- Failing to account for tax consequences when selling investments for a profit.
Questions
People also ask.
How often should I rebalance my portfolio?
Most investors rebalance either once a year or whenever an asset drifts more than five percent away from its target allocation.
Does rebalancing always involve selling assets?
Not necessarily. You can also rebalance by directing new cash contributions entirely into the lagging asset class.
Is rebalancing expensive?
It can incur transaction costs or capital gains taxes, so it is best to plan rebalancing moves carefully to minimise expenses.
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