Definition
The expense ratio is the total annual cost of owning a fund, expressed as a percentage of assets under management. It includes management fees, administrative costs, and other operating expenses. Lower expense ratios directly increase investor returns. The difference between 0.05% and 1.00% compounds dramatically: on $100K over 30 years at 8% return, the higher-fee fund costs ~$160K more.
functions Formula
Annual Fee = Assets × Expense Ratio
lightbulb Example
A $100,000 investment in a fund with 0.75% expense ratio costs $750 annually. An equivalent index fund at 0.03% costs only $30. The $720 annual difference compounds to over $30,000 over 20 years.
Pro Tip
A 1% difference in expense ratio can reduce your portfolio value by 25-30% over a 30-year investment period.
verified_user Key Points
- Lower is better—directly impacts returns
- Index funds: 0.03-0.10%; active funds: 0.50-1.50%
- Compounding fee impact is enormous over decades
- Total cost includes expense ratio + trading costs + taxes