When Should I Rebalance My Investment Portfolio?
Last reviewed: July 2026
You should rebalance your portfolio when any asset class drifts more than 5% from its target allocation, or on a set schedule such as once a year. Rebalancing means selling what has grown too large and buying what has shrunk, returning your mix of stocks, bonds, and other assets to the risk level you actually chose. Do it through new contributions or inside tax-advantaged accounts first to keep the tax bill down.
Key Takeaways
- Rebalance when an asset class drifts past a 5% threshold or on a fixed annual schedule, whichever comes first.
- Rebalancing controls risk; a portfolio left alone slowly becomes more aggressive than you intended.
- The most tax-efficient way to rebalance is directing new contributions to underweight asset classes.
- Rebalancing inside an IRA or 401(k) triggers no capital gains tax, unlike a taxable brokerage account.
- For 2026, you can contribute up to $24,500 to a 401(k), giving you fresh money to rebalance with.
About the Author: Jeff Judge, CFP®, AEP®, ChFC®, CLU® is Managing Partner of Chesapeake Financial Planners in Forest Hill, Maryland. He has been helping families and business owners in Harford County and the Baltimore metro area navigate investment and portfolio decisions since earning his CFP® certification in 2013, by using Chesapeake Financial Planners’ signature process, the R.U.D.D.E.R. method™. Jeff finds that most investors rebalance too often during calm markets and freeze up during the volatile stretches when rebalancing matters most.
Why Does Rebalancing a Portfolio Even Matter?
Markets do not move in lockstep. Stocks might surge while bonds sit flat. When that happens, your actual allocation drifts away from your target, and that drift quietly changes how much risk you carry.
Say you built a portfolio at 60% stocks and 40% bonds. After a strong few years for equities, you could be sitting at 72% stocks without ever placing a trade. You did not decide to take more risk. The market decided for you. Then a downturn arrives and your losses run deeper than the plan you signed up for.
Rebalancing is the discipline that prevents that. The SEC's investor education site describes asset allocation and periodic rebalancing as core tools for managing investment risk over time. Jeff Judge puts it more bluntly with clients: rebalancing forces you to sell high and buy low on a schedule, which is the opposite of what your gut wants to do.
There is a behavioral payoff too. When your portfolio matches your plan, you are far less tempted to panic during a selloff. The plan does the deciding, not your adrenaline.
When Should You Rebalance Your Portfolio?
There are two proven triggers, and many investors combine them.
Calendar rebalancing means you check and reset your portfolio on a fixed schedule, usually once a year. It is simple and removes guesswork. Pick a date, review your allocation, and adjust.
Threshold rebalancing means you only act when an asset class drifts beyond a set band, commonly 5%. If your 60% stock target climbs to 65% or falls to 55%, you rebalance. If it stays inside the band, you leave it alone.
The hybrid approach is what Jeff recommends to most clients: check on a calendar (annually), but only trade if a holding has breached its threshold. That keeps you from making needless trades during years when nothing moved much, while still catching the big drifts that matter.
How do you actually run the check? Add up every investment account you own, group your holdings by asset class, and divide each class by your total portfolio value. A $500,000 portfolio holding $325,000 in U.S. stocks sits at 65% stocks. If your target was 60%, that 5-point gap means it is time to act.
How Do You Rebalance Without a Big Tax Bill?
This is where most do-it-yourself investors stumble. Selling appreciated investments in a taxable brokerage account can trigger capital gains tax, so the method you choose matters as much as the timing.
Here are the three main methods, ranked roughly by tax-friendliness:
| Method | How It Works | Tax Impact |
|---|---|---|
| Rebalance with new contributions | Direct new money only into underweight asset classes | No sales, no capital gains tax |
| Rebalance inside tax-advantaged accounts | Buy and sell within an IRA or 401(k) | No capital gains tax on trades |
| Sell in a taxable account | Sell overweight positions to buy underweight ones | Capital gains tax may apply |
Start with new money. If you are still contributing, point those dollars at whatever is underweight until your allocation snaps back. For 2026, the IRS lets you put up to $24,500 into a 401(k), plus a catch-up contribution if you are 50 or older. That is a meaningful amount of rebalancing power before you ever sell a single share.
Next, do your rebalancing trades inside retirement accounts where buying and selling carries no tax consequence. According to the IRS, long-term capital gains on assets held more than a year are taxed at 0%, 15%, or 20% depending on your income, so trades inside a taxable account are not free. Save those for last.
If you must sell in a taxable account, you can pair the rebalance with tax-loss harvesting, where you sell losers to offset the gains on your winners. Watch the wash sale rule from IRS Publication 550, which disallows the loss if you rebuy the same or a substantially identical security within 30 days.
Frequently Asked Questions
How often should I rebalance my portfolio?
Most investors should rebalance their portfolio once a year, or whenever an asset class drifts more than 5% from its target allocation. Checking more often than quarterly rarely adds value and can pile up unnecessary trading costs and taxes. An annual review paired with a 5% drift threshold catches the moves that matter without overtrading.
What is portfolio drift?
Portfolio drift is the gradual shift of your actual asset allocation away from your target allocation, caused by different asset classes growing at different rates. If stocks outperform bonds for several years, your stock percentage climbs above target. Drift quietly raises your risk level, which is exactly why rebalancing on a schedule or threshold matters.
Does rebalancing trigger taxes?
Rebalancing triggers taxes only when you sell appreciated investments inside a taxable brokerage account. Rebalancing inside an IRA or 401(k) creates no capital gains tax, and rebalancing with new contributions avoids selling entirely. To minimize taxes, use new money first, then trade inside tax-advantaged accounts before touching taxable holdings.
Should I rebalance during a market crash?
Yes, a market crash is often the most valuable time to rebalance, because it means buying stocks while they are cheap and trimming the assets that held up. This feels uncomfortable, which is precisely why many investors skip it. A disciplined rebalance during volatility enforces buy-low behavior that emotion usually overrides.
What rebalancing threshold should I use?
A 5% drift threshold works well for most investors, meaning you rebalance only when an asset class moves more than five percentage points from its target. Tighter thresholds like 3% trigger more frequent trades and higher costs, while looser ones let risk build. The right band balances discipline against trading expense.
Can I rebalance my portfolio automatically?
Yes, many 401(k) plans and robo-advisors offer automatic rebalancing that resets your allocation on a set schedule or threshold without any action from you. Automatic rebalancing removes the emotional element and keeps you on track. Just confirm the tool rebalances across your whole portfolio, not each account in isolation.
Ready to Put a Plan Around Your Portfolio?
Rebalancing is one discipline inside a larger investment strategy, and getting the timing and tax treatment right is where a real plan pays for itself. If this was helpful, our guide on building a tax-smart investment approach covers the next layer in depth. Download it at chesapeakefp.com.
How should my investment mix change as I get closer to retirement?
Is my portfolio diversified enough to handle market volatility?
How can I reduce investment fees and keep more returns?
What should I do if the stock market crashes?
Want to go deeper? Our R.U.D.D.E.R Audit for DIY Investors walks through this step by step.
Disclosures
The information provided is for educational purposes only and should not be construed as investment advice. Investment strategies should be tailored to individual circumstances, risk tolerance, and goals. Past performance doesn't guarantee future results. Consult with qualified financial professionals regarding your specific situation.
This information is not intended to be a substitute for specific individualized tax, investment or legal advice. We suggest that you discuss your specific situation with a qualified tax, legal or financial advisor.
Advisors associated with Chesapeake Financial Planners may be either (1) LPL Financial Registered Representatives offering securities through LPL Financial, Member FINRA and SIPC, and investment advisor representatives offering investment advice through Great Valley Advisor Group; or (2) solely investment advisor representatives offering investment advice through Great Valley Advisor Group and not affiliated with LPL Financial. Great Valley Advisor Group, and Chesapeake Financial Planners are separate entities from LPL Financial.
