When you buy one share of an S&P 500 ETF like VOO or IVV, you're buying a tiny slice of all 500 companies in the S&P 500 index simultaneously. The ETF provider (Vanguard, BlackRock, State Street) manages the fund — buying and holding the underlying stocks according to the index rules — and passes costs to investors through the expense ratio.

What Is an Expense Ratio?

The expense ratio is the annual percentage of your assets that the fund manager charges to cover operating costs. It is automatically deducted from the fund's net asset value — you never see it leave your account, but it continuously reduces your returns.

What Is an ETF? Expense Ratios and Fee Drag Explained for Investors

Learn what ETFs are, how expense ratios work, and the real long-term dollar cost of fund fees. Discover why a 0.5% expense ratio can silently cost you $100,000 over 30 years.