This article explains mutual funds, how they pool money from investors to purchase a diversified portfolio, and the key differences between mutual funds and ETFs.
Educational content only — not personalized financial, legal, or tax advice.
A mutual fund is an open-end investment company regulated under the Investment Company Act of 1940 that pools financial capital from retail and institutional investors to purchase diversified portfolios of equity, fixed-income, or money market securities. Regulated as Registered Investment Companies (RICs) under Subchapter M of the Internal Revenue Code, mutual funds provide investors with professional portfolio management and asset diversification.
Unlike stocks or Exchange-Traded Funds (ETFs) that trade continuously on secondary exchanges throughout trading hours, mutual funds calculate share prices once daily following the 4:00 PM Eastern Time close of US financial markets.
The price per share is known as the Net Asset Value (NAV), calculated as:
$$\text{NAV} = \frac{\text{Total Market Value of Portfolio Assets} - \text{Total Fund Liabilities}}{\text{Total Fund Shares Outstanding}}$$
All investor purchase and redemption orders submitted during trading hours are executed at the next calculated NAV price (forward pricing).
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| SAMPLE DAILY MUTUAL FUND NAV CALCULATION SCHEME |
+------------------------------------+----------------------------------------------+
| Balance Sheet Metric | Fund Portfolio Dollar Amount |
+------------------------------------+----------------------------------------------+
| Total Portfolio Market Value Assets| $12,500,000,000 |
| Cash & Cash Equivalents Holdings | $350,000,000 |
| Gross Portfolio Assets | $12,850,000,000 |
| Less Total Fund Liabilities | -$150,000,000 |
| Net Asset Value (NAV) Total Pool | $12,700,000,000 |
| Total Fund Shares Outstanding | 250,000,000 Shares |
| Per Share NAV Execution Price | $50.80 per Share |
+------------------------------------+----------------------------------------------+
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| MUTUAL FUND SHARE CLASS FEE & EXPENSE STRUCTURES |
+-------------------+--------------------+--------------------+---------------------+
| Share Class | Sales Load Type | Annual 12b-1 Fee | Target Investor |
+-------------------+--------------------+--------------------+---------------------+
| Class A Shares | Front-end (up to | Low (0.25% max) | Long-term retail |
| | 5.75% of capital) | | wealth clients |
+-------------------+--------------------+--------------------+---------------------+
| Class C Shares | Level load / CDSC | High (1.00% max: | Intermediate retail |
| | (1.00% within 1 yr)| 0.75% mkt + 0.25%) | holding periods |
+-------------------+--------------------+--------------------+---------------------+
| Institutional / | Zero sales load | Zero 12b-1 fee | Pension funds & High|
| Admiral Shares | (No-load) | | Net Worth ($100k+) |
+-------------------+--------------------+--------------------+---------------------+
A mutual fund's operational expenses are deducted directly from portfolio assets and expressed as an annual percentage known as the Expense Ratio:
$$\text{Expense Ratio} = \frac{\text{Annual Management Fees} + \text{Administrative Costs} + \text{12b-1 Distribution Fees}}{\text{Average Net Fund Assets}}$$
Fund sponsors issue multiple share classes against identical underlying asset pools:
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| STRUCTURAL COMPARISON: MUTUAL FUNDS VS. CLOSED-END FUNDS VS. ETFS |
+--------------------+---------------------+--------------------+-------------------+
| Structural Metric | Open-End Mutual Fund| Closed-End Fund | Exchange-Traded |
| | | (CEF) | Fund (ETF) |
+--------------------+---------------------+--------------------+-------------------+
| Share Creation | Continuous / | Fixed IPO share | Continuous via |
| Mechanism | Unlimited shares | supply | Authorized Part. |
+--------------------+---------------------+--------------------+-------------------+
| Execution Pricing | Once daily at 4 PM | Continuous exchange| Intraday market |
| | EST NAV | price (Disc/Prem) | bid/ask spread |
+--------------------+---------------------+--------------------+-------------------+
| Capital Gains Tax | Year-end cash gains | Year-end cash gains| Deferral via |
| Efficiency | passed to holders | passed to holders | In-Kind baskets |
+--------------------+---------------------+--------------------+-------------------+
Mutual funds pass taxable events down to investors under Subchapter M of the Internal Revenue Code. When portfolio managers sell appreciated equities within the portfolio, realized capital gains are accumulated and distributed to shareholders at year-end.
Shareholders pay capital gains taxes on these distributions in the tax year realized, regardless of whether dividends were automatically reinvested or whether the investor held fund shares for less than a year.
In contrast, Exchange-Traded Funds (ETFs) mitigate year-end capital gains distributions through custom in-kind creation and redemption mechanisms governed by IRC Section 852(b)(6), making ETFs more tax-efficient in taxable brokerage accounts.