Portfolio Rebalancing: How It Works, Rules & Example
Rebalancing means periodically bringing your portfolio back to its target mix after market moves push it off course. It keeps your risk level where you intended and enforces a gentle buy-low, sell-high discipline.
How it works
- Write down target weights for each asset class, such as 70% stocks and 30% bonds.
- Choose a schedule, such as once a year, or a threshold, such as when any weight drifts 5 points.
- Compare current weights with your targets.
- Sell a little of what is overweight and buy what is underweight, or direct new money to the underweight side.
- Prefer tax-advantaged accounts for rebalancing trades to reduce tax costs.
The rules
π Pros
- Keeps risk aligned with your plan.
- Removes emotion from buy and sell decisions.
- Systematically trims winners and adds to laggards.
- Simple to automate with many brokers and funds.
π Cons
- Can trigger taxes and trading costs.
- May slightly reduce returns in long, strong bull markets.
- Feels uncomfortable because it means buying what has been falling.
Worked example
Common mistakes
- Rebalancing every week and racking up costs.
- Never rebalancing and drifting into a much riskier mix.
- Ignoring tax consequences in taxable accounts.
Tools for this strategy
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How often should I rebalance?
Once a year or when weights drift by about 5 percentage points are both common, simple rules.
Can I rebalance without selling?
Yes. Directing new contributions to the underweight asset is a tax-friendly way to rebalance.
Do target-date funds rebalance for me?
Yes. Target-date and many balanced funds rebalance automatically.
Similar strategies
Dollar-Cost Averaging
Dollar-cost averaging means investing the same amount of money on a regular schedule, no matter what the market is doing. It takes the guesswork out of timing and turns investing into a calm, repeatable habit.
π§ΊBuy and Hold Index Investing
Buy and hold index investing means owning low-cost funds that track a whole market and keeping them for the long run. Instead of hunting for winners, you own a slice of everything and let broad economic growth do the heavy lifting.
βοΈThe 60/40 Portfolio
The 60/40 portfolio holds about 60% in stocks for growth and 40% in bonds for stability. It is a classic balanced approach designed to smooth the ride while still aiming for long-term growth.