Investing term
What is Expense ratio?
The annual percentage of assets a fund charges to cover management and operations.
The expense ratio is the annual percentage a fund charges to cover its management and operating costs, skimmed automatically from your money — you never write a cheque, it's just quietly deducted from the fund's returns. It looks tiny, often well under 1%, which is exactly why it's so easy to ignore.
But it compounds relentlessly. A difference of even half a percent a year becomes enormous over decades, because the money lost to fees is money that can no longer compound. Minimising the expense ratio is one of the few things in investing fully under your control, and cheap index funds win in large part simply by keeping it near zero.
A 1% fee versus 0.05% looks trivial, but it compounds against you: over 30 years the gap swallows a large slice of your final wealth. It's the cost you fully control.
For example
On $100,000, a 1% expense ratio costs $1,000 a year versus $50 for a 0.05% index fund — and over 30 years that gap can swallow tens of thousands.
Learn it by doing
That's Expense ratio in theory — it clicks when you use it. Practise it hands-on in a free, interactive lesson (Stage 6, Index Funds, ETFs & Mutual Funds).
Try the free lesson →Why it matters to you
The expense ratio matters because it's the rare investing variable that's both fully controllable and highly predictive of long-run results. You can't control the market, but you can choose a fund charging 0.05% instead of 1%. Since fees compound against you exactly as returns compound for you, shaving the expense ratio is close to a guaranteed improvement — which is why it's the first thing to check on any fund.
⚠ Dismissing a fee as 'just 1%'
One percent sounds trivial, but it's charged on your whole balance every year, and the money it removes can never compound again. Over an investing lifetime, the gap between a 1% fund and a 0.05% one can consume a large chunk of your final wealth. A small-sounding fee is a large long-term cost — always check it.