The Hidden Cost of ETF Tracking Errors and How It Can Drain Your Portfolio

Key Points

• Many investors purchase an ETF and then overlook it.

• Monitoring your ETF holdings is essential, just like any other investment.

• A significant divergence between an ETF’s performance and its benchmark indicates a problem.

Exchange-traded funds (ETFs) have gained widespread popularity due to their simplicity, diversification, and low expense ratios. Yet a concealed cost—tracking error—often goes unnoticed and can erode thousands of dollars from returns over time. Below we explain what tracking error entails and how to steer clear of its profit‑draining effects.

What is a tracking error?

In an ideal scenario, an ETF would perfectly mirror its target index. Consider a broad‑market ETF that follows the S&P 500; its returns should closely match the index’s performance. When the fund consistently lags behind or exceeds the index, the variance is attributed to tracking error. A pronounced tracking error suggests the ETF fails to track its benchmark effectively, potentially diminishing long‑term returns.

Image source: Getty Images.

How a tracking error impacts your investment

Tracking errors can gradually diminish your portfolio’s value. Here’s how they do it:

• Loss of compounding: Consider a year where the S&P 500 rises 10% while your S&P 500‑tracking ETF gains only 7%. The 3% shortfall disappears, and you also lose the compounding gains that would have accrued on that missing return.
• Fees: Although many ETFs boast low expense ratios, some carry higher management costs. Holding an ETF with fees above the average can cause its returns to trail the benchmark by a noticeable margin.
• Tax implications: To stay aligned with their benchmarks, ETFs must be rebalanced regularly. This process can generate extra costs, such as capital‑gain distributions that may trigger taxes. Unexpected tax liabilities widen the gap between the benchmark’s annual return and the ETF’s actual performance.

How to mitigate the impact

The following three approaches can help lessen the effect of tracking errors on your portfolio:

1. Choose low-fee ETFs: Opt for low‑cost ETFs. Selecting funds with minimal expense ratios is a straightforward method to curb tracking error, as lower fees generally translate to better net performance.
2. Diversify: Spread your investments across several ETFs. Diversification can dilute the impact of any single fund’s tracking error on your overall portfolio.
3. Monitor: Review performance regularly. Compare your ETF’s returns to its benchmark every few months; a persistent discrepancy signals a tracking‑error problem.

ETFs remain a powerful vehicle for building wealth, yet they are not infallible. Whenever an ETF’s returns diverge from those of its benchmark, it warrants attention and possible corrective action.

Source link