Definition
Net Asset Value (NAV) is the per-share worth of everything a fund actually owns. You calculate it by taking the total value of the fund's assets — its stocks, bonds, cash, and any accrued income — subtracting its liabilities — fees owed, pending expenses — and then dividing by the number of shares outstanding:
NAV = (Total Assets − Total Liabilities) / Shares Outstanding
The key detail for beginners is *when* this happens. NAV is struck once per day, almost always at the 4:00 p.m. Eastern market close. At that moment the fund company prices every holding, tallies the total, and publishes a single official NAV. It does not change again until the next close. So NAV is a once-a-day snapshot of what a share is genuinely worth "under the hood."
For a traditional mutual fund, NAV *is* the price — you buy and sell at that day's closing NAV, and nothing else. For an exchange-traded fund (ETF), NAV is only half the story, because an ETF also trades on an exchange all day long at whatever price buyers and sellers agree on. That second number — the market price — is where things get interesting.
Why It Matters
Because an ETF trades continuously, its market price can drift away from its NAV. When the market price sits *above* NAV, the ETF trades at a premium; when it sits *below* NAV, it trades at a discount. Buying at a premium means paying more than the underlying holdings are worth; buying at a discount means paying less.
For most large, liquid ETFs these gaps stay tiny — often a few cents — thanks to a behind-the-scenes mechanism called creation and redemption. Big institutions (authorized participants) can swap a basket of the fund's underlying stocks for new ETF shares, or vice versa, whenever price and NAV diverge. If the ETF gets too expensive relative to NAV, they create new shares and sell them, pushing the price back down; if it gets too cheap, they redeem shares, nudging the price back up. This arbitrage keeps market price and NAV closely tethered. To help traders see the gap in real time, exchanges also publish an intraday indicative value (iNAV) — an estimate of NAV updated every 15 seconds during the trading day.
NAV matters even more once you move into high-distribution funds, especially covered-call and options-income ETFs. These funds advertise headline yields of 8%, 10%, or more. But a distribution can only be funded three ways: from income the fund earns, from capital gains it realizes, or from the fund's own principal. When a fund pays out more than it earns, it must sell assets to cover the check — and its NAV drifts steadily lower. This slow decline is called NAV erosion. A shrinking NAV alongside a fat distribution is a classic sign of return of capital: the fund is handing you back part of your own investment and labeling it "income." Learn more in Return of Capital and Distribution Rate.
This is why NAV should never be judged alone. What ultimately matters is total return — price change *plus* reinvested distributions. A fund whose NAV falls 5% while paying a 10% distribution still delivered a positive total return. NAV tells you where the value went; total return tells you whether you came out ahead.
Example
Suppose SCHD, a dividend-growth ETF, holds a basket of stocks worth $27.45 per share after subtracting fees. That $27.45 is its NAV. On the exchange it happens to be trading at $27.50 — a premium of $0.05, or about 0.18%. That gap is trivial, and creation/redemption will likely erase it within minutes. Paying $27.50 for $27.45 of assets is a rounding error, not a concern.
Now consider a high-yield covered-call fund such as SPYI or JEPI. Imagine one starts the year with a NAV of $50.00 and pledges a 12% distribution — $6.00 per share over the year. If the fund's strategy only *earns* about $4.00 of that per share, the remaining $2.00 has to come from selling assets. By year's end its NAV has drifted down to roughly $48.00 even though the market was flat.
An investor glancing only at the distribution sees a glorious 12% yield. An investor watching NAV sees the truth: the fund paid $6.00 but its per-share value fell $2.00, so the *real* economic gain was closer to $4.00 — a 8% total return, not 12%. Part of that "income" was simply their own capital handed back. The distribution was real, but some of it was return of capital, and NAV is what exposed it.
Common Mistakes
- Buying at a large premium. For a big, liquid ETF the premium is usually
negligible. But thin or exotic ETFs can trade at premiums of several percent — pay that and you have overpaid for the underlying assets on day one. Check the premium or discount before buying an unfamiliar fund.
- Mistaking a NAV drop for a "loss" of your dividend. When a fund goes
ex-dividend, its NAV mechanically falls by the distribution amount — the cash simply left the fund and went to you. That is not a loss; it is your money changing pockets. See Ex-Dividend Date.
- Assuming a low share price means "cheap." A fund at $12 is not cheaper than one
at $80. NAV and share price say nothing about whether a fund is a good value — valuation depends on the quality and yield of what it holds, not the sticker price.
- Ignoring NAV erosion in high-yield funds. A double-digit distribution rate is
not free money. If the NAV is steadily eroding, part of that yield is your own capital coming back to you. Always weigh distribution against NAV trend and total return.
- Confusing NAV with total return. NAV falling does not automatically mean you
lost money. Reinvested or received distributions can more than offset a NAV decline. Judge performance on total return, with NAV as one piece of the picture.
FAQ
What is the difference between NAV and market price?
NAV is the once-a-day official value of a fund's assets minus liabilities, divided by shares outstanding. Market price is what an ETF actually trades for on the exchange throughout the day, set by supply and demand. For mutual funds the two are identical because you transact at NAV. For ETFs the market price can sit slightly above NAV (a premium) or below it (a discount), though creation and redemption usually keep the gap very small for liquid funds.
Why is my ETF's NAV going down?
There are a few common reasons. If it dropped by roughly the distribution amount on the ex-dividend date, that is normal — the cash simply left the fund and came to you. If it is drifting lower over months while the fund pays a high distribution, that is often NAV erosion: the fund is paying out more than it earns and returning some of your capital. And of course NAV falls when the fund's underlying holdings fall in value. Look at total return, not NAV alone, to judge whether you actually lost money.
Is it bad to buy an ETF trading at a premium?
A small premium — a fraction of a percent — on a large, liquid ETF is nothing to worry about; arbitrage closes it quickly. A large premium of several percent, common in thin or niche ETFs, means you are paying meaningfully more than the holdings are worth, and the price can snap back toward NAV. Check the premium or discount before buying, especially for less-traded funds.
Does a falling NAV mean I am losing money?
Not necessarily. NAV is only half of your return. If you received or reinvested distributions, those can offset — or more than offset — a decline in NAV. What matters is total return, which combines price change and distributions. That said, a NAV that erodes while a fund pays a high distribution is a warning that part of your "income" may be return of your own capital.
What is a good NAV?
There is no such thing as a "good" or "bad" NAV number in absolute terms — a $10 NAV is not better or worse than a $100 NAV. NAV is just a per-share measure of value, not a quality score. What matters is how the market price compares to NAV (premium or discount) and whether the NAV is stable or eroding over time relative to the fund's distributions.