What rebalancing does and how to measure it
Rebalancing is the act of selling some of what has grown in your investment portfolio and buying more of what has fallen behind, so your mix stays close to your target. To check if it is working, you compare what you own now to what you said you wanted to own, then look at whether that gap has shrunk since you last rebalanced.
The simplest check: open your brokerage account or investment app, look at your current holdings, and write down the percentage each one represents. Then compare those percentages to your target allocation — the split you decided on when you started. If your stock fund was supposed to be 60 percent and it is now 65 percent, rebalancing worked if you sold some of it and bought bonds to bring it back down.
Rebalancing does not make your account grow faster. It keeps your risk level steady by preventing one investment from becoming too large a piece of your portfolio. If you do not rebalance, a strong performer can drift to 80 percent of your account, which means you are taking more risk than you planned.
Key Takeaways
- Check rebalancing by comparing your current portfolio percentages to your target allocation — the split you chose at the start.
- Your brokerage account or investment app shows your current holdings as both dollar amounts and percentages, which you can compare directly to your targets.
- Rebalancing has worked if your portfolio drifted away from your targets and you have since brought it back in line.
- A portfolio that stays within 5 percentage points of your target for each holding is considered well-rebalanced.
Where to find your current allocation
Most brokerages show your allocation in a dashboard or portfolio view. Log into your account and look for a tab labeled "Portfolio," "Holdings," "Positions," or "Asset Allocation." The page should list each fund or stock you own, the dollar amount, and the percentage of your total account.
If your brokerage does not show percentages automatically, you can calculate them yourself. Take the dollar amount of each holding, divide it by your total account value, and multiply by 100. A $30,000 holding in a $100,000 account is 30 percent.
Some apps like Vanguard, Fidelity, and Schwab have built-in allocation trackers that compare your current mix to your stated target and flag holdings that have drifted. If your brokerage has this feature, it will save you the math.
How much drift is normal before you rebalance
Your portfolio will never stay exactly at your target. Market movements happen daily, and small drifts are expected. Most investors rebalance when any single holding drifts more than 5 percentage points from its target, though some use 10 percent as their threshold.
If your target was 60 percent stocks and 40 percent bonds, you might rebalance when stocks reach 65 or 70 percent. The exact threshold depends on your comfort level and how often you want to trade. More frequent rebalancing keeps your risk tighter but costs more in trading fees and taxes.
A straightforward rule: if you check your allocation once a year and nothing is more than 5 points off, you are rebalancing successfully. If one holding has drifted 15 or 20 points away, you have waited too long.
Checking whether your rebalancing actually reduced risk
Rebalancing works if it keeps your portfolio risk level steady over time. The easiest way to verify this is to compare your allocation now to your allocation six months or a year ago. If you have stayed close to your target throughout that period, rebalancing is doing its job.
You can also look at your account statements from past rebalancing dates. If you sold some of a fund that had grown and bought more of one that had fallen, that is rebalancing in action. The goal is not to beat the market — it is to stick to the risk level you chose.
If you have never rebalanced and your portfolio has drifted significantly from your target, you have not yet benefited from rebalancing. The first rebalance will bring you back in line. After that, checking once or twice a year is usually enough.
Why your rebalancing might not be working
Rebalancing fails when you set a target but never check it. If you decided on 60/40 stocks and bonds five years ago and have never looked at your allocation since, you are not rebalancing — you are just letting the market decide your mix.
High trading fees can also undermine rebalancing. If your brokerage charges $10 per trade and you rebalance monthly, those fees add up. Some brokerages offer commission-free trading on stocks and funds, which makes frequent rebalancing practical. Others charge per transaction, which means you should rebalance less often.
Tax consequences matter too, especially in taxable accounts. Selling a fund that has gained value triggers capital gains tax. In a retirement account like a 401(k) or IRA, rebalancing has no tax cost, so you can do it freely. In a regular brokerage account, you may want to rebalance less often or use new contributions to shift your allocation instead of selling winners.
Using your brokerage tools to automate rebalancing
Many brokerages offer automatic rebalancing, which removes the need to check manually. You set your target allocation once, and the system rebalances on a schedule you choose — quarterly, annually, or when any holding drifts past a threshold you set.
Vanguard, Fidelity, and Schwab all offer this feature, usually at no extra cost. Robo-advisors like Betterment and Wealthfront rebalance automatically as part of their service. If your brokerage has this option, turning it on means you do not have to remember to check or trade yourself.
Even with automation, it is worth checking your allocation once a year to make sure the system is working as expected. Open your account, look at your current percentages, and compare them to your targets. If they are within your chosen threshold, rebalancing is working.
Frequently Asked Questions
How often should I check if my rebalancing is working?
Once or twice a year is typical for most investors. If you have automatic rebalancing turned on, you can check less often — maybe annually just to confirm the system is functioning. If you rebalance manually, checking before you trade ensures you are making the right moves.
What if one of my investments has grown way more than the others?
That is a sign you need to rebalance. If one holding has grown to 20 or 30 points above its target, sell some of it and buy the holdings that have fallen behind. This locks in gains from the strong performer and brings your risk back to your target level.
Does rebalancing mean I am selling winners and buying losers?
Yes, and that is the point. You sell what has done well recently and buy what has underperformed. This prevents any single investment from dominating your portfolio and forces you to buy low and sell high over time, which is the opposite of what most people do naturally.
Can I rebalance too often?
Yes. Rebalancing every month or every quarter can rack up trading fees and, in taxable accounts, create unnecessary tax bills. Most investors benefit from rebalancing once or twice a year, or when a holding drifts more than 5 to 10 points from its target.
What if my brokerage does not show percentages?
You can calculate them yourself by dividing each holding's dollar amount by your total account value and multiplying by 100. Or switch to a brokerage that shows percentages automatically — most major ones do, and many offer commission-free trading that makes rebalancing cheaper.