Direct Answer
Net asset value (NAV) equals total assets minus total liabilities - the accounting net worth of a company, essentially the same calculation as book value or shareholders' equity. NAV is the more common term for funds, REITs, and holding companies, where NAV per share is often compared against the traded market price to assess whether shares are changing hands at a premium or a discount to the underlying assets.
Key Takeaways
- NAV = Total assets − Total liabilities. It is essentially the same calculation as book value or shareholders' equity, just labeled differently by context.
- "NAV" is the terminology commonly used for mutual funds, closed-end funds, ETFs, REITs, and holding companies; "book value" is the more common label for an operating company's balance sheet.
- NAV per share divides total NAV by shares or units outstanding, giving a per-share accounting value that can be compared to the market price.
- A market price above NAV per share is described as trading at a premium; a market price below NAV per share is described as trading at a discount.
- A premium or discount to NAV can reflect several commonly cited and debated factors - expenses, liquidity, sentiment, leverage, taxes, and simple supply and demand - not one single cause.
- NAV depends on how the underlying assets and liabilities are valued on the books, which is not always identical to current market value for every asset type.
What Is Net Asset Value?
Net asset value is a company's total assets minus its total liabilities - what would theoretically be left over for owners if every asset were used to settle every liability at its stated accounting value. For an operating company, this figure is usually called book value or shareholders' equity, and it appears directly on the balance sheet as the difference between total assets and total liabilities. NAV is essentially the same calculation; it's simply the terminology that has become standard for funds, REITs, and holding companies rather than for typical operating businesses.
The reason the vocabulary splits this way is largely about what the number is used for. For a mutual fund or closed-end fund, NAV per share tells an investor what a share is worth based on the current value of the fund's holdings, and it's calculated on a regular schedule. For a publicly traded REIT or holding company, NAV is a benchmark that analysts use alongside the stock's market price - the two numbers don't have to match, and the gap between them (a premium or a discount) becomes a data point in its own right.
The NAV Formula
Net asset value = Total assets − Total liabilities.
To get a per-share figure, divide total NAV by the number of shares or units outstanding:
NAV per share = (Total assets − Total liabilities) ÷ Shares or units outstanding.
Every input in this formula comes from the same balance sheet used for book value: total assets includes everything the entity owns or holds - cash, securities, real estate, receivables, equipment, and other recorded assets - and total liabilities includes everything it owes, from debt to accrued expenses to other obligations. Because it's the same subtraction as book value or shareholders' equity, NAV inherits the same accounting basis: assets and liabilities are valued the way the applicable accounting rules require, which for some asset types is current market value and for others is historical or depreciated cost.
Worked Example
Hypothetical example - for education only. Consider a hypothetical closed-end fund with the following year-end figures:
| Item | Amount |
|---|---|
| Total assets (portfolio holdings + cash) | $500,000,000 |
| Total liabilities (accrued fees + short-term borrowings) | $20,000,000 |
| Net asset value | $480,000,000 |
| Shares outstanding | 40,000,000 |
| NAV per share | $12.00 |
NAV is $500,000,000 − $20,000,000 = $480,000,000. Dividing by 40,000,000 shares gives a NAV per share of $12.00. Now suppose the fund's shares actually trade on the market at $10.80. That's ($10.80 − $12.00) ÷ $12.00 = −10%, so the shares are trading at a 10% discount to NAV. If the market price were instead $13.20, that would be ($13.20 − $12.00) ÷ $12.00 = +10%, a 10% premium to NAV.
Comparing NAV Across Hypothetical Funds
The table below illustrates how the same NAV-per-share figure can correspond to a premium in one case and a discount in another, using illustrative, rounded figures.
| Fund | NAV per share | Market price | Premium / discount |
|---|---|---|---|
| Hypothetical Fund A | $12.00 | $10.80 | −10% (discount) |
| Hypothetical Fund B | $12.00 | $13.20 | +10% (premium) |
| Hypothetical Fund C | $25.00 | $25.00 | 0% (trades at NAV) |
These are hypothetical, rounded illustrations only, not a representation of any real fund's typical premium or discount behavior.
How NAV Is Used
For an open-end mutual fund, NAV per share is generally the price at which shares are bought and redeemed, calculated once per trading day after the market closes. For a closed-end fund, an ETF, a REIT, or a holding company whose shares trade continuously on an exchange, NAV per share and the market price are two separate numbers, and comparing them is a routine part of the analysis.
A share trading below its NAV per share is commonly described as trading at a discount; a share trading above NAV per share is described as trading at a premium. The reasons a discount or premium exists are commonly cited but contested, and can include expected future expenses or distributions, the liquidity of the underlying holdings, general market sentiment toward the fund's structure or sector, leverage in the portfolio, tax considerations, and ordinary supply and demand for the shares themselves. Because more than one explanation is usually in play at once, and because different funds and different periods can behave differently, no single cause should be assumed without checking the specific case.
For REITs and holding companies in particular, comparing NAV to market price is one lens among several - it says something about how the market is pricing the underlying assets relative to their accounting value, but it does not by itself say whether the current market price is "correct."
Limitations and Common Mistakes
| Mistake | Why it causes problems | Better practice |
|---|---|---|
| Assuming NAV equals current market value of every asset | Some balance-sheet items, particularly property, equipment, and certain intangibles, can be carried at historical or depreciated cost rather than what they'd fetch if sold today. | Check how the specific assets on the balance sheet are valued before treating NAV as a precise market-value estimate. |
| Treating a discount to NAV as an automatic buy signal | Discounts can persist for extended periods and can reflect real, ongoing factors like fees, illiquidity, or leverage rather than a temporary mispricing. | Research the specific reasons behind a fund's or REIT's discount history before assuming it will close. |
| Comparing NAV figures calculated on different dates | NAV moves with the value of the underlying holdings, so comparing a NAV from one date against a market price or peer NAV from a different date can be misleading. | Confirm the "as of" date on every NAV figure being compared. |
| Ignoring liabilities embedded in fund or REIT structures | Leverage, deferred fees, and other liabilities reduce NAV just like any other liability, and overlooking them overstates the accounting value available to shareholders. | Confirm total liabilities used in the NAV calculation include all debt and accrued obligations, not just the headline portfolio value. |
NAV is an accounting snapshot built from reported figures on a given date. It doesn't forecast future performance, and it isn't a substitute for understanding the quality, liquidity, and composition of the underlying assets and liabilities behind the number.
Frequently Asked Questions
Is NAV the same as book value?
Yes, in a company's financial statements, NAV and book value (shareholders' equity) are essentially the same calculation - total assets minus total liabilities. The term "NAV" is more commonly used for funds, REITs, and holding companies, while "book value" is the more common term for an operating company, but the underlying arithmetic doesn't change.
Why would a fund or REIT trade at a discount to NAV?
A discount can reflect several possible and often debated factors, including expected future expenses or distributions, illiquidity of underlying holdings, market sentiment, leverage, tax considerations, or simple supply and demand for the shares themselves. No single explanation applies to every case, and a persistent discount does not by itself prove the shares are undervalued.
How is NAV per share calculated?
NAV per share is total NAV (total assets minus total liabilities) divided by the number of shares or units outstanding. Mutual funds typically calculate this once per trading day; publicly traded closed-end funds and REITs also have a separate, continuously quoted market price that can differ from NAV per share.
Does NAV account for the market value of every asset?
Not always precisely. Funds generally mark liquid holdings to current market prices, but a company's balance sheet can carry assets like property, equipment, or intangibles at historical or depreciated cost rather than current market value, which is one reason accounting NAV or book value can diverge from an asset's real-world worth.
Is a premium or discount to NAV always a buy or sell signal?
No. A premium or discount to NAV is one data point, not a standalone signal. It should be considered alongside the reasons behind it, the holding's history of trading above or below NAV, fees, liquidity, and the broader context of the analysis - treating it as an automatic trading rule is a common mistake.
How is this measure calculated differently for a fund and for an operating company?
For a fund it is the market value of holdings less liabilities, divided by shares, and it is computed regularly from observable prices. For an operating company holding property or other illiquid assets, the asset values must be appraised or estimated, which introduces judgment. The two share a name and differ substantially in how much of the figure is observed rather than estimated.
Why do property-holding companies frequently trade below their asset value?
Explanations include the tax that would be payable on disposing of appreciated assets, the corporate overhead required to run the entity, doubt about the appraised values, and the illiquidity of the underlying assets. Persistent discounts across a sector suggest a structural cause rather than mispricing. The discount's size relative to its own history is more informative than its existence.
How current are the asset values behind a reported figure?
Appraisals are typically conducted periodically rather than continuously, so a reported figure can reflect valuations several months old, which matters most when the underlying market has moved. The valuation date is generally disclosed. During a period of rapid change in property or credit markets, a reported asset value can be substantially stale.
What should be checked before treating a discount as an opportunity?
Whether the assets could actually be realised at the appraised values, what tax and transaction costs a disposal would incur, whether management has any intention of realising them, and whether the discount has persisted historically. A discount that has existed for a decade with no catalyst is a structural feature. The absence of a mechanism to close it is the usual reason it stays open.