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You’ve set a target: maybe 70% stocks, 30% bonds. A year later, you check your account and it’s 80/20.
Nothing looks broken. You didn’t do anything wrong. Your stocks just grew faster than your bonds did.
But your risk level has quietly changed without you deciding it should. That’s what rebalancing exists to fix.
Quick Answer
Rebalancing means bringing your portfolio back to its original target allocation after market movement has pushed it off track.
For many long-term investors, reviewing the portfolio every six or twelve months can be a reasonable starting point. Others prefer to rebalance only when an asset class drifts beyond a threshold they set in advance. You don’t always need to sell anything – if you’re still contributing regularly, you can often rebalance simply by directing new money toward whichever asset has fallen below target.
The goal of rebalancing is to manage risk, not to boost returns. Rebalancing too frequently can create unnecessary transaction activity and, in a taxable account, unnecessary taxes.
Why Your Allocation Drifts in the First Place
If you haven’t settled on a target mix yet, start with our guide on what asset allocation is.
Different assets grow at different rates. If stocks have a strong year and bonds don’t, your stock allocation grows as a share of your total portfolio, even though you never bought a single additional share.
This is normal. It isn’t a sign that something went wrong. It’s simply what happens when you hold a mix of assets that move at different speeds.
The problem is what that drift does to your risk level. A portfolio that started at 70% stocks and drifted to 80% stocks is meaningfully riskier than the one you originally chose, even though you made no active decision to take on more risk.
When Should You Actually Rebalance?
There are two common approaches, and neither is universally “correct.”
Investor.gov describes both calendar-based and threshold-based approaches to rebalancing, and notes that rebalancing generally works best when done relatively infrequently.
Calendar-based rebalancing
Pick a schedule – every six or twelve months – and rebalance on that date regardless of how far your portfolio has drifted. This is simple and removes the temptation to constantly check.
Threshold-based rebalancing
Rebalance only when an asset class drifts beyond a threshold you set in advance. For example, an investor might decide to review a 70% stock target if it moves meaningfully above or below that level.
For beginners who prefer a simple routine, calendar-based rebalancing every six or twelve months can be easier to stick with.
Do You Have to Sell Anything?
Not necessarily, and this is the part most explanations skip.
If you’re still adding new money to your portfolio, you can often rebalance without selling a single share. Simply direct your next contributions toward whichever asset has fallen below its target percentage, instead of splitting new money evenly across everything.
This approach avoids selling anything, which matters most in a taxable account.
The Hidden Trade-Off: Taxes and Account Type
Where your portfolio lives changes how rebalancing works in practice.
Inside a Roth IRA, traditional IRA, or 401(k), buying and selling investments within the account generally does not create the same immediate capital-gains tax event that a sale can create in a taxable brokerage account. The tax treatment of withdrawals is a separate issue and depends on the account type.
Inside a taxable brokerage account, selling an investment that has gained value can trigger capital gains tax. That’s one more reason to lean on new contributions to rebalance in a taxable account, rather than selling your winners.
If you hold both taxable and tax-advantaged accounts, you may be able to reduce tax friction by doing more of your rebalancing inside the tax-advantaged account first, depending on how your investments are distributed across accounts.
A Simple Decision Framework
- Still adding new contributions regularly? Rebalance by directing new money to the underweight asset first. This usually avoids selling anything.
- Portfolio held in a Roth IRA or 401(k)? Selling and buying to rebalance generally doesn’t trigger the same capital-gains event as in a taxable account. This is often the easiest place to start.
- Portfolio held in a taxable brokerage account? Be more cautious about selling positions with large gains. Favor contribution-based rebalancing when possible.
- Checking your account more than a few times a year? That’s more often than most beginners need. Frequent checking tends to invite reactive decisions rather than better ones.
A Beginner Mistake to Avoid
One mistake beginners can make is turning rebalancing into constant portfolio tinkering.
Checking your allocation every week and making small adjustments each time can add unnecessary transaction activity and, in taxable accounts, potential tax consequences. Rebalancing is about maintaining your risk target, not reacting to every market move.
A related mistake is treating a temporary market swing as a signal to rebalance immediately. A single volatile week rarely justifies action. What matters is your allocation relative to target at your scheduled check-in, not the noise in between.
Where This Fits in Your Investing Plan
Rebalancing only matters once you have a portfolio with a defined target allocation to rebalance toward. If you haven’t built that structure yet, start with How to Build Your First Investment Portfolio.
If you’re adding new money on a regular schedule, understanding dollar-cost averaging pairs naturally with contribution-based rebalancing.
Bottom Line
Rebalancing isn’t about predicting the market or chasing better returns. It’s about keeping the risk level you originally chose, rather than letting it drift without your input.
Check in every six or twelve months, or set a drift threshold in advance. Use new contributions to correct drift before reaching for a sale. Be more careful about selling inside taxable accounts than inside retirement accounts.
Beyond that, the specific method matters less than actually doing it consistently, and not doing it so often that it becomes another form of market noise.
FAQ
A. Reviewing every six or twelve months is a common starting point. Some investors instead rebalance only when an asset class drifts beyond a threshold they set in advance. Either approach can work; more frequent rebalancing generally adds transaction activity without meaningfully improving long-term outcomes.
A. Not necessarily. If you’re contributing new money regularly, you can often rebalance by directing new contributions toward the asset that has fallen below its target percentage, rather than selling anything.
A. It can, if you sell an investment for a gain inside a taxable brokerage account. Buying and selling within a Roth IRA, traditional IRA, or 401(k) generally does not create the same immediate capital-gains event. Tax treatment of withdrawals from those accounts is a separate matter and depends on account type.
A. No. The primary purpose of rebalancing is to manage risk by keeping your portfolio aligned with your original target allocation, not to improve returns.
This article is for informational and educational purposes only and does not constitute financial, tax, or investment advice. Tax treatment of rebalancing transactions depends on your account type and individual circumstances. Always consult a qualified financial or tax professional before making investment decisions.