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  1. Home
  2. Glossary
  3. Expense Ratio
GlossaryETFs & Index Funds

Expense Ratio

The annual fee a fund charges, expressed as a percentage of the amount invested. Lower expense ratios leave more of the return with the investor — a key reason low-cost index funds are popular.

Appears in these guides

  • Expense Ratios & Fund CostsETFs & Index Funds
  • CommissionsBrokers & Accounts
  • ETFs vs Mutual FundsETFs & Index Funds
  • What Is An ETF?ETFs & Index Funds

Related terms

Accumulating FundActive ManagementBenchmarkDistributing FundETFIndexIndex FundMutual FundNAVPassive Investing

Related lessons

beginnerETFs & Index Funds

Index Funds & Passive Investing

Arguably the most important idea in investing for ordinary people: owning the whole market cheaply instead of trying to beat it. What an index is, how index funds replicate it, why passive investing beats most active management after costs, and how regular investing turns it into a wealth-building habit.

Ironclad Research provides educational content only. Nothing on this platform is financial advice, a recommendation, or an offer to buy or sell any security. Always do your own research and consider professional advice before making financial decisions.