XLK Charges One Cent Less Than VGT For Every $100 Invested. Here's Why That's Not The Reason To Choose It.

XLK charges one cent less than VGT for every 0 invested. Here’s why that’s not the reason to choose it.

Rates are a rounding error. The 0.01% difference between XLK and VGT is negligible, so your decision should focus on structure, exposure, liquidity and investment use case rather than focusing solely on cost.
The structure and business profile are more important. XLK’s narrower S&P 500-based focus, tighter bid-ask spreads, and deeper options market make it better suited for active traders, while VGT offers broader exposure with greater inclusion of mid- and small-cap companies for long-term investors.
You don’t have to choose just one. Holding both can be practical in taxable accounts since they are not considered substantially identical, allowing you to harvest tax losses between them without triggering wash sale rules while maintaining technology exposure.
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Competing asset managers tend to offer very similar ranges of ETFs, especially when it comes to sector funds. Whether you’re looking at Vanguard, iShares, or State Street, you’ll usually find a comprehensive set of ETFs covering all 11 official sector classifications.

At first glance, many of these funds appear almost identical, making the choice seem to come down to one simple factor: fees.

Take technology, for example. you have the Technology Select Sector SPDR ETF (NYSEMKT: XLK) and the Vanguard Information Technology ETF (NYSEMKT: VGT). Both provide exposure to high-growth technology stocks and both have been strong performers.

Many investors opt for XLK because it is a little cheaper. It charges an expense ratio of 0.08%, compared to 0.09% for VGT. That is a base point. For every $100 invested, you’re saving one cent per year. That difference is insignificant and should not be the deciding factor.

There are valid reasons to prefer XLK over VGT, but they have nothing to do with rates. This is what really matters, in my opinion.

The first key difference is the benchmark each ETF follows.

XLK tracks the Technology Select Sector Index, which is based solely on companies already included in the S&P 500. That results in a more concentrated portfolio of about 73 large-cap stocks that have already been analyzed for size, liquidity and profitability.

VGT, on the other hand, tracks a broader information technology index and owns more than 300 stocks. It is not limited to the S&P 500, so it includes more mid- and small-cap names.

A wider exposure might be expected to reduce the concentration. But in practice it is not like that. Since both ETFs are weighted by market capitalization, the largest companies continue to dominate. Adding smaller companies does not dilute that effect as much as one might think, since their weights are relatively smaller.

This creates some differences in performance over time. As of March 31, 2026, VGT has slightly outperformed over the past 10 years, with an annualized return of 21.44% versus 20.91% for XLK. That said, past performance alone is not a compelling reason to choose one over the other.

From a portfolio construction standpoint, there is an argument for XLK’s more limited approach. By sticking to the components of the S&P 500, it focuses on the largest, most established companies in the sector with stronger profitability and earnings consistency.

Where XLK really sets itself apart is in business efficiency. The ETF has tighter bid-ask spreads. On a 30-day average basis, XLK is trading with a spread of around 0.01%, compared to around 0.04% for VGT. That difference may seem small, but it adds up for active traders.

XLK also tends to have higher trading volume, which can improve execution and reduce slippage. More importantly, it has a much more developed options market. If you’re looking to implement strategies like covered calls, XLK offers more strike prices, more expiration dates, and generally tighter spreads. That gives you greater flexibility and more efficient operations.

While the ETF’s liquidity ultimately comes from the underlying holdings, these factors are still important in practice, especially if you trade frequently or use derivatives. For long-term investors, both ETFs can serve a similar function. But if you’re doing more than just buy and hold, XLK has a clear advantage.

One final point that is often overlooked is that choosing between XLK and VGT doesn’t have to be an either/or decision. There is a use case for owning both, especially if you are investing in a taxable account.

Because these ETFs follow different benchmarks and are issued by different providers, they are generally not considered “substantially identical” under IRS rules. That’s important for tax loss harvesting. If one position is low, you can sell it for a capital loss and immediately rotate it into the other without triggering the 31-day wash sell rule.

Despite their similar sector focus and overlapping holdings, the construction of the underlying index is different enough to make them viable substitutes for this purpose. That makes them a useful pair if you want to continue investing in the technology sector while still being able to capture losses along the way.

If you’re unsure how this applies to your specific situation, especially across different account types, it’s worth consulting with a financial advisor or tax professional before implementing the strategy.

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