Glossary/Funds

Expense Ratio

Also known as Total expense ratio, Ongoing charges ratio

An expense ratio is a fund’s recurring operating expenses expressed as a percentage of its average net assets. It commonly includes management, administration, custody, accounting, and other fund costs, but the exact inclusions depend on the jurisdiction and disclosure document.

Editorially reviewed 2026-07-30

Why expense ratio matters

Expenses are deducted from fund assets and compound against investor wealth every year. Small percentage differences become material over long horizons, especially for strategies with similar gross exposure. The ratio helps compare ongoing costs, but it may omit trading costs, entry or exit charges, performance fees, borrowing expense, and taxes. Investors need the complete cost picture rather than the headline figure alone.

How it is applied

The fund totals eligible operating expenses for the reporting period and divides them by average net assets, normally annualizing shorter periods. Analysts compare the current prospectus, audited financial statements, fee waivers, class-specific charges, turnover, and transaction-cost disclosures. Comparisons should use funds with similar strategies and distribution arrangements. Temporary waivers require an expiry date and the gross ratio should also be reviewed.

Formula

Expense ratio = Annual fund operating expenses / Average net assets
Annual fund operating expenses
Recurring costs included under the applicable disclosure rules
Average net assets
Average NAV during the measurement period

Portfolio example

A fund with $500 million of average net assets incurs $3 million of included annual expenses. Its expense ratio is 0.60%. An investor’s account is not charged a separate $60 invoice per $10,000; instead, costs are paid by the fund and reduce NAV and reported return over time.

How to interpret it

A lower ratio leaves more gross return for investors but does not guarantee better net performance. Active, specialist, or less liquid strategies may cost more to operate. Compare institutional and retail share classes carefully because identical portfolios can carry different distribution and servicing charges. Net expense ratios after waivers can understate the longer-term cost. Compare costs for equivalent exposures and service levels. A lower ratio is beneficial when portfolios are otherwise comparable, but it does not offset poor tracking, avoidable taxes, weak execution, or an unsuitable investment mandate.

Limitations and common misconceptions

Definitions and presentation differ across markets and vehicles. Ratios are backward-looking or estimated, and average assets can make costs appear lower after strong inflows. Brokerage, spreads, market impact, financing, and performance fees may sit outside the measure. Tax and advisory-account charges are investor-specific. Prospectus details and total net returns remain essential.

Sources and further reading

← All glossary terms