Rebalancing Your Portfolio: What It Is and Why It Matters

Rebalancing means periodically returning your portfolio to its target mix of stocks, bonds and other assets after market movements have shifted the weights. It matters because, left to itself, a portfolio gradually drifts toward whatever has risen most and quietly becomes riskier than you intended. Rebalancing restores the risk level you chose and, as a by-product, enforces a disciplined habit of trimming what is expensive and adding to what is cheap.

This article is for the investor who has a target asset allocation and wants to understand how to maintain it sensibly, and tax-efficiently, over the years.

What rebalancing actually is

Suppose you decide that a portfolio of 60 percent equities and 40 percent fixed income suits your goals and risk tolerance. That mix is your target. Over time, if equities perform strongly, they grow to a larger share of the portfolio, perhaps 70 percent. The portfolio now carries more risk than you signed up for, simply because you left it alone.

Rebalancing is the act of selling some of the overweight portion and buying the underweight portion to bring the mix back to 60/40. It sounds almost too simple to matter. Its power lies in what it quietly forces you to do: sell a little of what has done well and buy a little of what has lagged, which is the opposite of what fear and greed tend to push investors toward.

Why it matters more than it seems

The main purpose of rebalancing is risk control, not return enhancement. In some periods a drifting portfolio will actually outperform a rebalanced one, because letting winners run can pay off. But it does so by taking on risk you did not choose, and that risk tends to reveal itself at the worst possible time, during a downturn, when a portfolio that has drifted heavily into equities falls much harder than intended.

There is a behavioural benefit as well. Rebalancing gives you a rule to follow instead of a decision to agonize over. During market volatility, it provides a constructive action that keeps you invested and aligned with your plan rather than reacting emotionally. Your target mix should reflect your risk tolerance, capacity and need; rebalancing is simply how you hold the portfolio to that standard year after year.

Common approaches to rebalancing

There is no single right method. Three broad approaches are widely used, and many investors combine them.

Approach	How it works	Strengths	Watch-outs
Calendar (time-based)	Rebalance on a fixed schedule, such as annually	Simple, predictable, easy to automate	May act when drift is small, or wait while drift grows
Threshold (drift-based)	Rebalance when an asset strays beyond a set band, e.g. 5 percentage points	Responds to actual market moves	Requires monitoring; can cluster during volatile periods
Combined	Check on a schedule, act only if drift exceeds a threshold	Balances discipline with efficiency	Slightly more involved to maintain

For most investors, checking once or twice a year and acting only when a holding has drifted meaningfully is a sensible middle path. The goal is to control risk without generating needless trading, cost and tax.

How often is often enough

Rebalancing more frequently does not reliably improve results, and it can increase trading costs and, in non-registered accounts, taxes. Rebalancing too rarely, or never, allows risk to build up silently. Somewhere in between is the practical answer for most people.

An annual review is a reasonable default, perhaps tied to a date you will remember. Between reviews, a large market move might justify an earlier look. The point is to have a rule and follow it, rather than deciding case by case in the heat of the moment.

The tax dimension: where you rebalance matters

This is where Canadian investors should pay attention, because the account type changes everything.

Inside registered accounts such as a TFSA, RRSP or RRIF, you can buy and sell freely to rebalance with no immediate tax consequence. Growth is sheltered, so there is no capital gain to report when you trim a winner.

Inside a non-registered account, selling an investment that has risen in value generally realizes a capital gain, half of which is included in your taxable income. Rebalancing can therefore carry a real tax cost. There are gentler ways to manage this:

• Use new money. Direct fresh contributions toward the underweight assets rather than selling the overweight ones.
• Use withdrawals. If you are drawing income, take it from the assets that have grown beyond target.
• Rebalance across accounts. Do more of the buying and selling inside registered accounts, where it is tax-free, and leave non-registered holdings undisturbed where possible.
• Mind the cost base. Keep accurate records of your adjusted cost base so gains are reported correctly.

These ideas connect to the broader discipline of tax-efficient investing in Canada, where the account you hold an investment in is as important as the investment itself. As always, confirm the tax treatment of any sale with your accountant, because your situation is specific to you.

Rebalancing in practice

A simple, repeatable process looks like this:

1. Write down your target allocation and the reasons behind it.
2. Review the portfolio on a set schedule, for example once a year.
3. Compare current weights to targets and note any that have drifted beyond your threshold.
4. Rebalance first with new contributions or planned withdrawals, then with sales inside registered accounts, and only then with taxable sales if needed.
5. Document what you did and why.

Keeping that record matters. It turns rebalancing into a plan you can follow rather than a reaction you have to justify later.

Common mistakes to avoid

Even investors who understand rebalancing in theory stumble over a few predictable errors in practice. Being aware of them is half the battle.

• Rebalancing on emotion rather than rule. The whole point is to remove feeling from the decision. Selling your winners because you are nervous, or refusing to buy the laggards because they frighten you, defeats the purpose.
• Ignoring the tax cost in non-registered accounts. Trading freely in a taxable account can generate capital gains that quietly erode the benefit. Favour new money and registered accounts first.
• Setting bands too tight. Rebalancing at every small drift creates needless cost and effort. A modest threshold, such as several percentage points, is usually enough.
• Forgetting to revisit the target itself. Rebalancing returns you to your target mix, but if your circumstances have changed, the target may need updating before you rebalance to it. Your allocation should still reflect your risk tolerance, capacity and need.
• Neglecting the whole household. Spouses often hold several accounts. Rebalancing is best done across the entire household portfolio, not one account at a time, which also opens up more tax-efficient options.

The aim throughout is steadiness. Rebalancing is not meant to be clever or frequent; it is meant to be consistent and disciplined, so that your portfolio never drifts far from the risk level you deliberately chose.

How Hayes Wealth Partners can help

Rebalancing is one of those tasks that is simple in theory and easy to neglect in practice, particularly across multiple accounts with differing tax treatment. Our investment management service keeps portfolios aligned to each client’s target mix, rebalances with an eye on tax efficiency, and ensures the risk level stays where it belongs through rising and falling markets alike.

If you are not sure whether your portfolio still matches the risk you intended, book a private consultation and we will review your allocation, your drift and the most tax-efficient way to bring it back into line.