Portfolio Rebalancing: When, Why and How

When should I rebalance?

There are three main ways to decide when it's time to rebalance.

1. Relative band Loot Lasso's pick

Rebalance when an asset class drifts a set percentage away from its own target. I use a 10% relative band.

With a 50% target for U.S. stocks, a 10% band means you rebalance if stocks fall below 45% or rise above 55%. For a smaller 20% bond target, the range is 18% to 22%. Each class gets a range that fits its size.

2. Fixed band

Rebalance when an asset class is off by a fixed number of percentage points, with different limits by size. For example: about 5 points for large holdings, 2–3 points for moderate ones and 1–2 points for small ones.

This works much like a relative band, but the cutoffs are rougher and you have to decide which bucket each holding falls in. A relative band handles that automatically, which is why Loot Lasso prefers it.

3. Calendar

Rebalance on a set schedule, such as every December, twice a year or quarterly. It's easy to follow, but it can miss a big drift between dates or make you trade when nothing has moved much.

U.S. stocks target: 50%rebalance below 45% or above 55%

Bonds target: 20%rebalance below 18% or above 22%

A 10% relative band. The shaded range is where no trades are needed; the line marks the target.

Many investors combine methods: they check on a schedule, such as once or twice a year, and only trade if something is outside its band.

Tip: If you're still adding money regularly, you can often rebalance just by sending new contributions to whatever is underweight. A band approach fits well with this, because small drifts get fixed by new money and you rarely need to sell.

What makes rebalancing tricky

Rebalancing sounds simple, but a few things can get in the way.

Knowing your goals and risk tolerance

Without a clear target allocation, it's hard to know when or how to rebalance. Learn how to choose your allocation.

Taxes

Selling investments in a taxable brokerage account can trigger capital gains taxes, which eat into your returns. The Loot Lasso calculator avoids sales in taxable accounts and does the selling inside tax-advantaged accounts instead.

Trading costs

Most major brokerages no longer charge commissions on stock and ETF trades, but some mutual funds still carry transaction fees, and some 401(k) plans limit frequent trading. Avoid lots of tiny trades that aren't worth the effort or cost.

Different account types

Taxable and tax-advantaged accounts suit different investments, so copying the same mix into every account usually isn't the best approach. See which investments go where.

Put these together across several accounts, and it gets hard to rebalance each account while keeping your overall portfolio on target. That's the problem the Loot Lasso calculator was built to solve.

How do I rebalance?

Depending on your style, how many accounts you have and your goals, rebalancing can be simple or complex. Here are the main options:

Use new contributionsSend new deposits and reinvested dividends to underweight asset classes. This rebalances without selling, so there's nothing to tax. The Loot Lasso calculator shows where new money should go.
Use an all-in-one or target-date fundThese funds hold a set mix and rebalance automatically. They're simple, but can cost more, offer less flexibility and are less tax-efficient in a taxable account.
Schedule check-insPick a time, such as once or twice a year, to compare your current allocation with your targets and rebalance anything outside its band.
Use a robo-advisorRobo-advisors manage your allocation, risk level and often tax strategy automatically. They cost less than a traditional advisor but charge an ongoing fee.
Work with a financial advisorAn advisor can offer personalized planning for complex situations and a wider range of investments, usually at a higher cost.

Final thoughts

Rebalancing is a key part of long-term investing. Whether you do it yourself, use software or hand it off, staying aligned with your goals keeps your risk in check and your strategy disciplined. If you'd rather manage it yourself, the Loot Lasso calculator makes it easy.