Mutual Fund NAV Explained: What Net Asset Value Actually Means
NAV is the most misread number in Indian investing. It looks like a price tag. It behaves like an accounting entry. Here's the exact formula, the cut-off times, and why "low NAV" was never a bargain.
If you check your mutual fund's NAV every time it updates, you're already paying more attention than most investors ever do. That instinct — wanting to know the number behind your investment — is the right one. The problem is that almost nobody explains what NAV actually is, or what it isn't.
What most investors haven't been told is that NAV is not a price in the way a stock's share price is a price. It carries none of the signals we instinctively read into a "price" — cheapness, expensiveness, or market sentiment. Treating it that way is the single most common misjudgment in Indian retail fund selection, and it quietly steers people toward the wrong funds for the wrong reasons.
By the end of this article, you'll know exactly how NAV is calculated, when it's declared, how your units get allotted, and — most importantly — why the NAV number in front of you has almost nothing to do with whether a fund is a good investment. Getting this wrong doesn't just cost you a misunderstanding; it can steer ₹10,000 a month into the wrong fund for a decade.
In This Article
- 1What NAV Is: The Exact Formula Behind Every Unit
- 2How NAV Gets Calculated and Published Every Day
- 3The "Low NAV = Cheap Fund" Myth, Busted With Numbers
- 4What Actually Moves NAV: Portfolio Value, Not Fund Size
- 5NAV vs Share Price: Why Funds Don't Have a Market Price
- 6NAV Cut-Off Times: 3 PM, 1:30 PM, and Why It Matters
- 7How Units Are Allotted: Amount Invested ÷ NAV
- 8What NAV Growth Looks Like Over 10–15 Years
- 9Mistakes Investors Make Chasing NAV
- 10What Actually Matters: XIRR and CAGR, Not NAV Level
1What NAV Is: The Exact Formula Behind Every Unit
Net asset value (NAV) is the price of one unit of a mutual fund. Every rupee you invest buys you units, and every unit is worth exactly one NAV. The formula is fixed by SEBI regulation and applied identically across every AMC in India:
The NAV Formula
NAV = (Total Portfolio Value − Liabilities) ÷ Total Outstanding Units
Recalculated fresh, every single business day, after markets close.
Break the formula into its three parts. Total Portfolio Value is the sum of the current market value of every security the fund holds — every stock, bond, or money-market instrument, valued at that day's closing price. Liabilities are what the fund owes: accrued expenses, pending payables, and fees not yet deducted. Outstanding Units is the total number of units held by every investor in the fund, added together.
Divide the first number, net of the second, by the third, and you get NAV. It is not set by negotiation, demand, or investor sentiment on any given day — it is a mechanical accounting result. That single distinction is the key to everything else in this article.
2How NAV Gets Calculated and Published Every Day
NAV calculation is not a one-time event — it happens fresh every single business day, for every open-ended scheme in India. The process runs on a fixed daily cycle after the exchanges close.
Markets close (3:30 PM, NSE/BSE)
The closing price of every listed security the fund holds is locked in for the day. Unlisted or thinly traded debt securities are valued using SEBI-mandated valuation agencies (ICRA, CRISIL) rather than a live market price.
The AMC's valuation team marks the portfolio
Every holding — equity, debt, cash, receivables — is valued at its official closing price for the day. This produces the Total Portfolio Value for the formula above.
Liabilities and daily expenses are deducted
The fund's daily-accrued expense ratio, along with any other payables, is subtracted. This is why the expense ratio silently reduces NAV every single day, without ever appearing as a separate line item.
The result is divided by total outstanding units
Giving the NAV per unit for that business day. This is done independently, once, for every scheme and every plan (Direct/Regular, Growth/IDCW) an AMC runs.
NAV is published to AMFI and AMC platforms
By law, AMCs must publish NAVs to the AMFI website and their own platforms by 11:00 PM the same business day for most schemes — in practice it is usually available by early evening.
This is why you never see an intraday NAV updating in real time the way a stock price does on a trading app. NAV exists once per business day, calculated after the fact, from the day's official closing prices — not projected, estimated, or negotiated in the moment.
3The "Low NAV = Cheap Fund" Myth, Busted With Numbers
This is the myth that costs Indian investors real money. Two funds sit side by side on a distributor's recommendation sheet — one with a NAV of ₹18, another with a NAV of ₹410 — and the instinct is to assume the ₹18 fund is "cheaper" and therefore has more room to grow. It doesn't work that way. Watch what happens to an identical ₹1 lakh investment in both.
Fund A — NAV ₹18
- Investment: ₹1,00,000
- Units allotted: 5,555.56
- 1-year return: +14%
- NAV after 1 year: ₹20.52
- Value after 1 year: ₹1,14,000
Fund B — NAV ₹410
- Investment: ₹1,00,000
- Units allotted: 243.90
- 1-year return: +14%
- NAV after 1 year: ₹467.40
- Value after 1 year: ₹1,14,000
A fund's NAV level tells you nothing about whether it can grow 14% or 4% next year. It tells you how long the fund has existed and how it has compounded historically — nothing about its forward-looking quality. Comparing two funds' NAVs to decide which to buy is comparing the wrong number entirely.
4What Actually Moves NAV: Portfolio Value, Not Fund Size
If NAV isn't driven by how "cheap" or "expensive" a fund is perceived to be, what does move it? Only one thing: the market value of what the fund actually holds. Fund size (AUM) and unit count are irrelevant to NAV's direction — they only affect how the same portfolio value gets sliced into units.
| Factor | Effect on NAV | Why |
|---|---|---|
| Underlying stocks/bonds rise in price | NAV rises | Portfolio value increases; unit count stays constant, so per-unit value rises. |
| Underlying stocks/bonds fall in price | NAV falls | Portfolio value decreases; the loss is spread evenly across all units. |
| Fund's total AUM grows (new investors) | No direct effect | New money buys new units at that day's NAV — it does not dilute or inflate existing unit value. |
| Total outstanding units increase | No direct effect | Units are issued proportional to money in; the NAV per unit is unaffected by how many total units exist. |
| Daily expense ratio deduction | NAV slightly reduced | Costs are deducted from the portfolio value before dividing by units — a small, continuous daily drag. |
A fund with ₹50,000 crore in AUM and a fund with ₹500 crore in AUM can have identical NAVs, identical daily NAV movement, and identical returns — fund size changes how big the portfolio is in absolute terms, not how the per-unit price behaves. NAV is entirely a reflection of what's inside the fund, marked to market, every single day.
5NAV vs Share Price: Why Funds Don't Have a Market Price
It's natural to map NAV onto the mental model of a stock's share price — both are per-unit numbers that go up and down. But structurally, they work in almost opposite ways.
A share price is set in real time by buyers and sellers trading on an exchange. It reflects supply, demand, sentiment, and speculation at every second the market is open — a stock can be genuinely overpriced or underpriced relative to its fundamentals.
A fund's NAV is calculated once a day from the fund's actual holdings. There is no bid-ask spread, no order book, and no possibility of the fund trading above or below its true underlying value — NAV, by construction, always equals exactly what the portfolio is worth.
This is also why mutual fund units can't be day-traded the way stocks are. There's no live price discovery happening between 9:15 AM and 3:30 PM — only one official price gets set per day, after the market closes and the portfolio is valued. Even exchange-traded funds (ETFs), which do trade intraday, still publish an official end-of-day NAV that their traded price is expected to track closely.
The absence of a bid-ask spread also means you're never paying a "premium" or getting a "discount" when you buy fund units — you always transact at the fund's exact, calculated NAV. That certainty is one of the underrated structural advantages of mutual funds over direct stock investing for most retail investors.
6NAV Cut-Off Times: 3 PM, 1:30 PM, and Why It Matters
Because NAV is only calculated once per business day, SEBI defines strict cut-off times that determine which day's NAV applies to your transaction. Miss the cut-off by even a few minutes, and your order rolls to the next business day's NAV.
| Fund Type | Cut-Off Time | Redemption Settlement |
|---|---|---|
| Equity / Hybrid / most Debt Funds | 3:00 PM | T+3 business days |
| Debt Funds (non-liquid, general) | 3:00 PM | T+1 to T+2 business days |
| Liquid Funds | 1:30 PM | T+1 business day |
| Overnight Funds | 1:30 PM (3:00 PM for redemptions) | T+1 business day |
| ELSS (Tax Saving) | 3:00 PM | T+3 (plus 3-year lock-in per instalment) |
For equity and most other funds: a purchase or redemption application submitted and payment realised before 3:00 PM on a business day gets that same day's NAV. Submit after 3:00 PM, and you get the next business day's NAV instead — even if it's just 3:05 PM.
Liquid and overnight funds have an earlier 1:30 PM cut-off, because these funds price in a day's interest accrual and are designed for very short holding periods — often used as a parking spot for money between larger financial decisions. The faster T+1 settlement on liquid funds is precisely why they're preferred over savings accounts for short-term surplus cash.
7How Units Are Allotted: Amount Invested ÷ NAV
Every purchase — whether a lump sum or a monthly SIP instalment — is converted into units using one formula: the amount you invest divided by the NAV applicable on that transaction date.
Unit Allotment Formula
Units Allotted = Amount Invested ÷ Applicable NAV
Say you run a ₹10,000 SIP into an equity fund. In January, the NAV on your SIP date is ₹42 — you get 238.10 units. If markets correct and the NAV drops to ₹36 in February, your same ₹10,000 instalment now buys 277.78 units. Fewer units when NAV is high, more units when NAV is low — this is exactly the mechanism behind rupee-cost averaging, and it's automatic, requiring no action from you.
SIP amount
₹10,000
Same every month
NAV in a falling month
₹36
Lower NAV → more units
Units allotted
277.78
₹10,000 ÷ ₹36
Your total holding at any point is simply the sum of all units allotted across every instalment, multiplied by today's NAV. This is also why your CAS (Consolidated Account Statement) shows a running unit balance rather than a rupee balance — units are the actual asset you own; the rupee value is just units × current NAV, recalculated fresh every day.
8What NAV Growth Looks Like Over 10–15 Years
NAV growth over long periods is where compounding becomes visible. Consider an illustrative fund that launched at a face value of ₹10 — the standard starting NAV for most new fund offers (NFOs) in India — and compounded at different category- typical rates.
—
at ~13% CAGR
at ~13% CAGR
at ~13% CAGR
at ~13% CAGR
This is illustrative math at a flat 13% CAGR — real diversified equity fund categories in India have historically delivered CAGR ranges roughly between 10–15% over long rolling periods, with meaningful year-to-year variation rather than a smooth line. A fund's NAV climbing from ₹10 to over ₹100 over two decades is not unusual for a well-run equity fund; it simply reflects sustained compounding of the underlying portfolio, not anything unusual about the fund itself.
The trap is reading a high NAV like this and assuming the fund has "run its course" or has less room to grow. A fund's NAV level says nothing about its future — a ₹115 NAV fund and a newly launched ₹10 NAV fund investing in the same category can deliver identical forward returns from here. History is priced in; it is not a ceiling.
9Mistakes Investors Make Chasing NAV
The NAV misunderstanding shows up in a handful of predictable, recurring investor mistakes. Recognising them is the fastest way to stop making them.
- Comparing NAVs across funds with different launch dates — a fund launched in 2005 will naturally show a higher NAV than one launched in 2020, purely from more years of compounding, regardless of quality.
- Assuming a NAV that fell sharply means the fund is now "cheap" — a falling NAV in a market correction reflects falling portfolio value, the same portfolio you already own, not a bargain entry point.
- Switching out of a high-NAV fund into a low-NAV fund expecting more "room to grow" — this often means exiting a proven long-term performer for an unproven one, based on a number that predicts nothing.
- Judging SIP performance by unit count instead of value — accumulating more units in a falling market is expected and healthy (rupee-cost averaging); it is not evidence the fund is underperforming.
Every one of these mistakes traces back to the same root cause: treating NAV as a valuation signal when it is only an accounting output. Once that distinction is clear, most NAV-driven decision errors simply stop happening.
10What Actually Matters: XIRR and CAGR, Not NAV Level
If NAV itself isn't the right number to evaluate a fund on, what is? The answer is your rate of return — measured properly, accounting for when and how much you invested.
For a lump-sum investment, use CAGR (Compound Annual Growth Rate) — the annualised percentage growth in NAV between your purchase date and today, ignoring the absolute NAV numbers on either end.
For a SIP, use XIRR (Extended Internal Rate of Return) — it accounts for every instalment's date and amount, giving you your true personal rate of return rather than a simple average.
Compare returns against the fund's category benchmark and peer funds over the same rolling period — a 13% CAGR looks strong in isolation but weak if the category averaged 16% over the same window.
Check consistency across multiple rolling periods (3-year, 5-year), not a single point-in-time return, which can be skewed by a lucky or unlucky starting date.
Factor in expense ratio and Direct vs Regular plan — two funds with identical portfolios can show meaningfully different XIRR purely from cost drag, with nothing to do with NAV.
NAV will always be the first number you see on any fund page — it's unavoidable, and there's nothing wrong with checking it daily. Just make sure it's the last thing you use to decide whether a fund deserves your money. Your XIRR, your category- adjusted CAGR, and your cost structure are what actually determine whether an investment was a good one.
Frequently Asked Questions
Common questions about mutual fund NAV for Indian investors.
What is NAV (net asset value) in a mutual fund?
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How is NAV calculated for a mutual fund?
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Does a high NAV mean a mutual fund is expensive to buy?
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What time is NAV declared for mutual funds in India?
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How many units do I get when I invest based on NAV?
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What matters more than NAV when choosing a mutual fund?
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Live NAV Is Only Useful With Context — FundSageAI Gives You Both
Most portfolio trackers show you the raw NAV number and stop there — the exact framing this article just spent ten sections arguing against. A NAV in isolation tells you nothing about whether your fund is actually performing.
Upload your CAS to FundSageAI and every holding shows its current NAV alongside your actual XIRR, category-adjusted rolling returns, and how it stacks up against its benchmark — not just what the unit is worth today, but what your real return has been since you invested.
No more guessing whether a "low NAV" fund is a bargain or a "high NAV" fund has peaked. See the number that actually matters, for every fund in your portfolio, in one place.
FundSageAI is an analytics platform. Content on this blog is for educational purposes only and does not constitute financial advice. Always consult a SEBI-registered investment advisor for personalised recommendations.