September 22, 2026 | By the Elystar Team

Portfolio activity can easily be mistaken for portfolio management. Markets move, valuations change, new opportunities emerge, and investment views evolve. Each portfolio change may have a reasonable rationale. But every change also carries a cost — and some of those costs are less visible than others.

The relevant question, therefore, is not whether a portfolio should change. It is whether the expected benefit of a change is sufficient to justify its costs and risks.

The Costs of Portfolio Turnover

1. Transaction Costs

Every transaction involves some combination of brokerage, bid-ask spreads, market impact and execution slippage. Individually, these costs may appear small. But when turnover is frequent, they can accumulate into a meaningful drag on long-term returns.

2. Taxes

Selling profitable investments can bring forward the realization of capital gains and associated taxes. This matters because investment outcomes should ultimately be evaluated after costs and taxes. A strategy that generates attractive pre-tax returns may deliver a meaningfully different result to the investor after both are considered.

3. Interrupted Compounding

The cost of turnover extends beyond the amount paid today. Capital lost to transaction costs or taxes is no longer available to compound. Over long investment horizons, even relatively small recurring costs can have a significant cumulative effect.

4. Decision Risk

Every transaction is another decision that can be wrong. More activity creates more opportunities for poor timing, behavioural biases, overreaction to new information and responses to short-term market noise. This is an important but often overlooked cost of turnover: increasing the number of decisions also increases the number of opportunities to make mistakes.

5. Loss of Strategic Coherence

A well-constructed portfolio should reflect an investor's objectives, asset allocation, time horizon and deliberate set of risk exposures. Too many tactical decisions can gradually transform such a portfolio into a collection of individual trades. Each trade may appear reasonable in isolation while the portfolio as a whole becomes less aligned with its original purpose.

When Is Turnover Justified?

Avoiding unnecessary turnover does not mean that portfolios should remain static. Portfolio changes can be appropriate when:

• The investment thesis or underlying fundamentals have materially changed.
• Valuations no longer adequately compensate for the risks being taken.
• Portfolio exposures have moved sufficiently away from their intended allocation to require rebalancing.
• The investor's goals, liquidity requirements, risk tolerance or circumstances have changed.
• A new opportunity offers a sufficiently better risk-return proposition to justify replacing an existing investment.
• Tax, regulatory, liquidity or other portfolio-level considerations make a change appropriate.

The distinction is between necessary turnover and unnecessary turnover.

Every Trade Should Have a Hurdle Rate

Before replacing an existing investment, the question should not simply be:

“Is there a better investment?”

A better question is:

“Is it sufficiently better to justify the cost of changing?”

This distinction matters. A new investment does not merely need to look attractive. Its expected improvement to the portfolio should be sufficient to compensate for transaction costs, tax consequences, implementation risks and the possibility that the new decision is wrong.

In that sense, every trade should have a hurdle rate. The greater the cost and uncertainty associated with making a change, the stronger the investment case for that change should be.

Activity Is Not the Same as Discipline

Good portfolio management requires action when action is warranted. But it also requires the discipline to remain invested when the portfolio continues to serve its intended purpose.

The objective is neither to minimize turnover at all costs nor to continuously search for something better. It is to make changes when the expected improvement to the overall portfolio sufficiently outweighs the costs and risks of acting.

Sometimes the right decision is to rebalance. Sometimes it is to replace an investment. And sometimes, the most valuable portfolio decision is the one where you choose not to make any changes.
 

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