Rebalancing

Before you rely on it

What to check

Decide the trigger in advance, a calendar date or a drift threshold, and check the tax cost inside a taxable account.

The common error

Where people go wrong with rebalancing

Rebalancing by feel. That reliably becomes buying more of whatever has been working, which is the opposite of what the discipline exists to do.

Worked through

Rebalancing in plain numbers

A portfolio targets 70% stocks and 30% bonds. After a strong year it holds $150,000, with $117,000 in stocks and $33,000 in bonds, a mix of 78/22. To return to target, stocks should be 70% of $150,000, or $105,000. Sell $12,000 of stocks and buy $12,000 of bonds. That is rebalancing: selling some of what grew and buying some of what lagged. You did not need to predict anything. You applied a rule. Do it in a tax-advantaged account and there is no tax bill. In a taxable account the sale may create a gain, so you might steer new contributions to the lagging asset instead.

Easily confused

Rebalancing and its neighbours

Rebalancing is not market timing, and it is not the same as changing your allocation. Timing bets on forecasts of which asset will do well. Rebalancing restores a mix you already decided on, regardless of forecasts. Changing the allocation is a new decision, made when goals or circumstances change. Calendar rebalancing acts at set dates, such as once a year. Threshold rebalancing acts when an asset class drifts by a set amount, say five percentage points. Target-date funds rebalance internally, so an investor in one does not need to.

In real decisions

Where rebalancing turns up

Investors and advisors rebalance to keep risk near the level they chose. Without it, a portfolio in a long bull market slides toward more stocks and more risk than intended. Retirement plans offer automatic rebalancing; some investors use new savings and withdrawals to steer the mix; a calculator shows the trades needed to return to target, given current values and target weights. Deciding on a rule in advance takes emotion out of the process.

Know the edges

Where rebalancing stops being reliable

Trading has costs and tax consequences. Rebalancing too often adds costs with little benefit, and too rarely lets risk drift. In a persistent trend, selling winners early can reduce gains, and it cannot prevent losses in a broad decline. This is general education, not personal advice. Choose a schedule or threshold that fits your accounts, costs and temperament.

Quick answers

What people ask about rebalancing

How often should I rebalance? Once a year is common, or when an asset class drifts by a set amount, such as five percentage points from target. More frequent checks add cost without much benefit.

Can I rebalance without selling? Yes. Direct new contributions or dividends to the underweight asset. In a taxable account this avoids realizing gains.

Do target-date funds rebalance for me? Yes. They adjust the mix internally and shift gradually toward more conservative holdings over time.

Does rebalancing raise returns? Not necessarily. Its main benefit is keeping risk near your plan. It can add a little return in mean-reverting markets and lose some in strong trends.