The Total Annual Fund Operating Expenses ("Expense Ratio") is the line of the fee table in the prospectus that represents the total of all of a mutual fund

Mutual fund

A mutual fund is a professionally managed type of collective investment scheme that pools money from many investors to buy stocks, bonds, short-term money market instruments, and/or other securities.- Overview :...

's annual fund operating expenses, expressed as a percentage of the fund's average net assets. Looking at the expense ratio can help you make comparisons among funds.
Sources of Information

The expense ratio of a stock

Stock fund

A stock fund or equity fund is a fund that invests in equities more commonly known as stocks. Stock funds are contrasted with bond funds and money funds. Fund assets are typically mainly in stock, with some amount of cash, which is generally quite small, as opposed to bonds, notes, or other...

 or asset fund is the total percentage of fund assets used for administrative, management, advertising (12b-1), and all other expenses. An expense ratio of 1% per annum means that each year 1% of the fund's total assets will be used to cover expenses. The expense ratio does not include sales loads or brokerage commissions.

Expense ratios are important to consider when choosing a fund, as they can significantly affect returns. Factors influencing the expense ratio include the size of the fund (small funds often have higher ratios as they spread expenses among a smaller number of investors), sales charges, and the management style of the fund. A typical annual expense ratio for a U.S.

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 domestic

Domestic

Domestic or domestique can refer to:* A cycling domestique* A domestic worker* Domestic airport* Domestic violence* Domestic , a group with Trust in Trance Records* Domestikos , a Byzantine title...

 stock

Stock

The capital stock of a business entity represents the original capital paid into or invested in the business by its founders. It serves as a security for the creditors of a business since it cannot be withdrawn to the detriment of the creditors...

 fund is about 1%, although some passively managed funds (such as index fund

Index fund

An index fund or index tracker is a collective investment scheme that aims to replicate the movements of an index of a specific financial market, or a set of rules of ownership that are held constant, regardless of market conditions.-Tracking:Tracking can be achieved by trying to hold all of the...

s) have significantly lower ratios: for example, the Vanguard

The Vanguard Group

The Vanguard Group is an American investment management company based in Malvern, Pennsylvania, that manages approximately $1.6 trillion in assets. It offers mutual funds and other financial products and services to individual and institutional investors in the United States and abroad. Founder...

 US Large Cap ETF

Exchange-traded fund

An exchange-traded fund is an investment fund traded on stock exchanges, much like stocks. An ETF holds assets such as stocks, commodities, or bonds, and trades close to its net asset value over the course of the trading day. Most ETFs track an index, such as the S&P 500 or MSCI EAFE...

 has an expense ratio of 0.07%. http://www.ishares.net/content/stream.jsp?url=/publish/repository/documents/en/downloads/product_list_uk.pdf

One notable component of the expense ratio

Ratio

In mathematics, a ratio is a relationship between two numbers of the same kind , usually expressed as "a to b" or a:b, sometimes expressed arithmetically as a dimensionless quotient of the two which explicitly indicates how many times the first number contains the second In mathematics, a ratio is...

 of U.S. funds is the "12b-1 fee", which represents expenses used for advertising and promotion of the fund. 12b-1 fees are generally limited to a maximum of 1.00% per year (.75% distribution and .25% shareholder servicing) under Financial Industry Regulatory Authority

Financial Industry Regulatory Authority

In the United States, the Financial Industry Regulatory Authority, Inc., or FINRA, is a private corporation that acts as a self-regulatory organization . FINRA is the successor to the National Association of Securities Dealers, Inc. ...

Rules.

Waivers, reimbursements & recoupments

Some funds will execute "waiver or reimbursement agreements" with the fund's adviser or other service providers, especially when a fund is new and expenses tend to be higher (due to a small asset base). These agreements generally reduce expenses to some pre-determined level or by some pre-determined amount. Sometimes, these waiver/reimbursement amounts must be repaid by the fund during a period that generally cannot exceed 3 years from the year in which the original expense was incurred. If a recoupment plan is in effect, the effect may be to require future shareholders to absorb expenses of the fund incurred during prior years. It is calculated by operating expenses

Changes in expense ratio (fixed & variable expenses)

Generally, unlike past performance, expenses are very predictive. Funds with high expenses ratios tend to continue to have high expenses ratios. An investor can examine a fund's "Financial Highlights" which is contained in both the periodic financial reports and the fund's prospectus, and determine a fund's expense ratio over the last five years (if the fund has five years of history). It is very hard for a fund to significantly lower its expense ratio once it has had a few years of operational history.

This is because funds have both fixed and variable expenses, but most expenses are variable. Variable costs are fixed on a percentage basis. For example, assuming there are no breakpoints, a .75% management fee will always consume .75% of fund assets, regardless of any increase in assets under management. The total management fee will vary based on the assets under management, but it will always be .75% of assets.

Fixed costs (such as rent or an audit fee) vary on a percentage basis because the lump sum rent/audit amount as a percentage will vary depending on the amount of assets a fund has acquired. Thus, most of a fund's expenses behave as a variable expense and thus, are a constant fixed percentage of fund assets. It is therefore, very hard for a fund to significantly reduce its expense ratio after it has some history. Thus, if an investor buys a fund with a high expense ratio that has some history, he/she should not expect any significant reduction.

Expenses matter relative to investment type

There are 3 broad investment categories for mutual funds (equity, bond, and money market - in declining order of historical returns). That is an over simplification but adequate to explain the effect of expenses. In an equity fund where the historical gross return might be 10%, a 1% expense ratio will consume approximately 10% of the investor's return. In a bond fund where the historical gross return might be 8%, a 1% expense ratio will consume approximately 12.5% of the investor's return. In a money market fund where the historical gross return might be 5%, a 1% expense ratio will consume approximately 20% of the investor's historical total return. Thus, an investor must consider a fund's expense ratio as it relates to the type of investments a fund will hold.