A 0.0645 Percentage Point Difference Could Cost Retirement Savers Thousands

An investor with a $100,000 initial investment earning 7% annually would lose over $18,000 after 30 years by choosing SPY over VOO due to higher fees.

The difference stems from a 0.0645 percentage point gap in annual costs: the Vanguard S&P 500 ETF (VOO) charges 0.03%, while the SPDR S&P 500 ETF Trust (SPY) charges 0.0945%. Two funds tracking the same index. One outcome shaped by compounding costs.

U.S.-listed ETFs held $14.21 trillion in assets as of early 2026, according to the Investment Company Institute. Popularity has made ETFs a default choice for retirement accounts. But not all ETFs serve long-term savers equally.

Over long retirement horizons, small differences in expense ratios compound into significant differences in final portfolio value. The gap between VOO and SPY is not an outlier—it’s a demonstration of how fee structures silently redirect wealth.

Leveraged ETFs and futures-based funds introduce additional risks, designed for daily resets, not decades of growth. Thematic ETFs concentrating in AI or clean energy add sector risk under the guise of innovation. But even without those complexities, a basic choice between two major S&P 500 funds can cost thousands.

Transparency in decision-making matters more than a catchy theme or rock-bottom marketing. Every fraction of a percent paid in fees is a fraction less working for the investor. Retirement savers who do not scrutinize ETF expense ratios risk eroding returns by thousands of dollars over decades.