How Do You Rebalance Your 401(k)? (2026)

What does rebalancing a 401(k) mean?

When you chose your 401(k) funds, you picked a mix, such as 70% stock funds and 30% bond funds. Markets then move that mix on their own. Investor.gov's example is a portfolio meant to be 60% stocks that reaches 80% after a stock market rise; Vanguard's is a 70/30 portfolio that drifts to 76/24. Rebalancing brings the mix back to the target so the risk you carry is the risk you chose.

Keep rebalancing separate from reallocating. Investor.gov says the most common reason to change the target itself is a change in your time horizon, along with changes in your risk tolerance, finances or goal. Vanguard puts it plainly: the purpose of rebalancing is to manage risk, not to maximize returns.

Should you rebalance on a calendar or when your mix drifts?

Investor.gov says either method works and that rebalancing tends to work best when done relatively infrequently. Vanguard says its research found the best methods are neither very frequent, such as monthly or quarterly, nor very infrequent, such as every two years, and that an annual rebalance is optimal for many investors. Vanguard's own example uses a 5-percentage-point band; there is no single correct number.

Why doesn't selling inside a 401(k) trigger tax?

The IRS describes a 401(k) this way: traditional salary deferrals are excluded from your taxable income when you contribute, and distributions, including earnings, are taxed when they are paid out. Qualified distributions from designated Roth accounts aren't taxed. Because tax is applied when money leaves the plan, moving money from one fund to another inside it doesn't create a capital gain or loss.

A taxable brokerage account works differently. Selling there can realize a gain, which the IRS treats as short-term if you held the asset one year or less and taxes at ordinary income rates. That difference is why the account you rebalance in matters. Taking money out of a 401(k) is a distribution, which is taxed, so rebalancing means moving money between funds, not withdrawing it.

How do you rebalance in your plan's portal?

Every plan's website looks different, but the job is the same. Investor.gov describes three basic ways to rebalance, and all of them work inside a 401(k): sell some of what is overweight and buy what is underweight, add new money to the underweight asset, or change ongoing contributions so more goes to the underweight category until the mix is back.

• • Log in and find your balance by fund, with the dollar amount in each.
• • Label each fund as stocks, bonds or cash-like, using its name and fact sheet. A target-date or balanced fund holds a mix, so its fact sheet shows the split.
• • Work out your current percentages and compare them with your target.
• • To move existing money, look for the option to exchange or transfer between funds. This changes your current balance.
• • To steer future money, look for the option to change your contribution or investment elections. This only affects new contributions, and nothing is sold.
• • If the site offers a rebalancing tool or an automatic rebalancing setting, check which funds and percentages it will use before you turn it on.
• • Before you confirm, check the plan's fee disclosure for any charge or restriction on exchanges, then keep the confirmation and check the next statement.

What should you check before you trade?

Fees and rules. The Department of Labor says that if you direct your own investments, your plan should give you information on its investment options and their fees, in a format that lets you compare them, before you first direct your investments and annually after that, plus a quarterly statement of fees actually deducted from your account. It also says some plans charge individual service fees, for example for carrying out participant investment directions.

The DOL's model fee chart shows the kinds of restrictions plans list, such as a limit on buying back into a fund for a period after excessive trading, or a waiting period before moving money from a stable value fund to a competing option. Your plan's summary plan description explains how the plan operates. While you are in the portal, compare expense ratios too: in the DOL's example, a $25,000 balance earning 7% a year for 35 years grows to $227,000 with 0.5% in fees and to $163,000 with 1.5%, 28% less.

What if you're in a target-date fund?

Investor.gov explains that a target-date fund shifts from mostly stocks toward more bonds as its target year approaches, and that the fund's adviser handles that shift, called the glide path, along with rebalancing inside the fund. If your whole 401(k) is in one target-date fund, there is nothing for you to rebalance.

There are still things to check. Investor.gov says funds with the same target date can have different strategies, glide paths and fees, that some glide paths stop at the target date while others continue past it, and that fees can be charged by both the target-date fund and the funds it holds. It also notes that employers may automatically enroll you in a target-date fund, and that if you hold one alongside other funds, you should consider how it fits your overall mix, because the fund only rebalances itself.

What are the ways to keep a 401(k) on target, and what do they cost?

When should you look outside your usual schedule?

• • After a large market move, which can push your mix past your band faster than usual. Rebalancing then means returning to your plan, not forecasting what happens next.
• • After a life change, such as a new job, a marriage, a child or retirement getting closer. That is usually a question about the target itself, a reallocation rather than a rebalance.
• • When money moves in or out, such as rolling an old 401(k) into a new plan. When you withdraw, Vanguard suggests taking money from the asset classes that are overweight.

When is another option the better choice?

• • You don't want to manage the mix at all: a target-date fund handles rebalancing inside the fund, though Investor.gov says it doesn't remove the need to check that its date, glide path and fees fit you.
• • You want your 401(k) mix checked alongside other accounts: Astor links brokerage and retirement accounts and lets you ask about the combined mix. Ecomerate's brokerage connections are not live yet.
• • You want someone to set and maintain the target: a registered investment adviser, who Investor.gov says must act in your best interest.

Where does Ecomerate fit?

Ecomerate is an AI research analyst you text in iMessage, and it plays no part in rebalancing your plan. Its fit is the individual stocks you own, inside or outside a 401(k), such as company stock or shares in a brokerage account. Tell it what you own and why; it remembers your reasons, checks new filings and earnings for those stocks against them, and texts you when something touches them, quoting the detail.

It doesn't connect to your 401(k), set your allocation, plan your finances or give tax advice, and it never tells you to buy, sell or hold. Any change to your 401(k) is one you make yourself, in your plan's portal.