What is the difference between NAV and iNAV?

NAV is the official, once-daily calculated value of an ETF’s underlying assets, while iNAV is a continuously updated, real-time estimate published during trading hours to help investors understand fair value.

Can a retail investor create or redeem ETF units directly?

Only Authorised Participants, large institutions, can create or redeem units directly with the fund issuer in Creation Unit-sized blocks. Retail investors buy and sell ETF units on the exchange like any listed stock.

Why does an ETF sometimes trade at a premium or discount to its NAV?

Temporary premiums or discounts can arise from supply-demand imbalances in the secondary market, but the creation-redemption arbitrage mechanism generally helps narrow this gap for liquid ETFs relatively quickly.

Is a lower expense ratio always better when choosing an ETF?

Yes, for passively managed index ETFs, since a lower expense ratio directly improves net returns over time, though tracking error and liquidity should also be considered alongside cost.

How is tracking error different from tracking difference?

Tracking error is a statistical measure of the volatility of return differences between the ETF and its benchmark over time, while tracking difference is simply the cumulative or point-in-time gap between the ETF’s actual return and the benchmark’s return.

Does SEBI guarantee that an ETF’s price will always match its NAV?

SEBI mandates transparency mechanisms such as daily portfolio disclosure and iNAV publication, but price-NAV alignment ultimately depends on market liquidity and the effectiveness of the creation-redemption arbitrage process, not on a regulatory guarantee.

How are gold ETFs taxed differently from equity ETFs in India?

Gold ETFs are treated as non-equity assets and do not qualify for the ₹1.25 lakh annual LTCG exemption available to equity ETFs under Section 112A; both now require a 12-month holding period for LTCG (following the Finance Act 2024/2025 changes) and are taxed at 12.5% long-term without indexation.

Can I offset a loss from a gold ETF against a gain from an equity ETF for tax purposes?

Yes, provided the timelines align correctly, a long-term capital loss from a gold ETF can be set off against long-term capital gains from an equity ETF (or any other capital asset) in the same financial year, since long-term losses are not restricted to offsetting gains within the same asset class.

ETF Glossary: ETF Investment Terms and Concepts

ETF Terminology Explained: A Complete Glossary for Understanding Exchange-Traded Funds

6 min read•Updated on 12th Sept, 2026•by Team Angel One

Exchange-traded funds have become one of the most popular ways to invest in India. They offer the diversification of a mutual fund with the tradability of a stock. But ETF factsheets and fund disclosures are packed with terms that aren’t always self-explanatory, from “creation units” to “tracking error” to “iNAV.”

This article walks through the essential ETF terminology every investor should know.

Key Takeaways

An ETF’s market price and its Net Asset Value (NAV) are kept close together through the creation-redemption mechanism, carried out by Authorised Participants (APs), not by direct investor action.
Tracking error measures how closely an ETF’s returns follow its benchmark index over time; a lower tracking error generally indicates a more efficiently managed fund.
The intraday indicative NAV (iNAV) is a real-time estimate published throughout the trading day, but it is not the price at which units are created or redeemed.
The expense ratio, bid-ask spread, and premium/discount to NAV together determine the real cost of holding and trading an ETF, beyond the headline fund fee.
Since the 2024 tax overhaul, ETF taxation now depends heavily on the underlying asset class (equity, debt, or gold). Each carries a different holding period and tax rate, making the ETF type just as important as the ticker for tax planning.

ETF Terminology

1. Fundamental Valuation Terms

Net Asset Value (NAV): The "true" value of an ETF, calculated by taking the total value of all securities in the fund, subtracting liabilities, and dividing by the number of outstanding shares.
Premium/Discount: The difference between the ETF’s market price and its NAV. If an ETF trades above its NAV, it is at a Premium. If below, it is discounted.
Intraday Indicative Value (IIV): A real-time estimate of an ETF’s fair value, updated throughout the trading day to help investors avoid overpaying.

2. Performance & Cost Metrics

Expense ratio: The annual fee charged by the ETF provider to manage the fund. It is expressed as a percentage of your total investment and is automatically deducted from the fund’s performance.
Tracking error: The divergence between the price behaviour of an ETF and the underlying index it is designed to track. A lower tracking error indicates a more efficient fund.
Tracking difference: The actual difference in returns between the ETF and its benchmark over a specific period, accounting for fees and transaction costs.

3. Trading & Liquidity Terms

Bid-ask spread: The difference between the highest price a buyer is willing to pay (Bid) and the lowest price a seller is willing to accept (Ask). Narrow spreads indicate high liquidity.
Average Daily Volume (ADV): The average number of shares traded per day. Higher volume generally makes it easier to trade without causing "slippage" (unfavourable price movement).
Authorised Participant (AP): Large financial institutions that have the exclusive right to create or redeem ETF shares directly with the fund provider to keep the market price aligned with the NAV.

Example of Bid-Ask Spread Friction

Scenario: If an ETF unit has a Bid price of ₹200.00 and an Ask price of ₹200.50, the absolute spread is ₹0.50 (or 0.25% relative to the ask price).

Impact: An investor buying at the ask price of ₹200.50 and attempting to sell immediately at the bid price of ₹200.00 incurs an instant transaction friction of 0.25%, which is separate from brokerage charges, GST, or the fund's annual expense ratio.

Term	Meaning
Net Asset Value (NAV)	The per-unit value of an ETF’s underlying assets, calculated once daily by subtracting liabilities from total assets
Intraday Indicative NAV (iNAV)	A real-time estimate of an ETF’s NAV, typically updated every 15 seconds during market hours, used as a live reference point but not the actual transaction price
Authorised Participant (AP)	A large institutional entity, often a market maker or broker, permitted to create or redeem ETF units directly with the fund in large blocks
Creation Unit	The minimum fixed block size (often ranging from thousands to hundreds of thousands of units) in which APs can create or redeem ETF units directly with the issuer
Creation/Redemption Mechanism	The in-kind process by which APs exchange a basket of underlying securities for new ETF units (creation) or ETF units for the underlying basket (redemption), keeping market price aligned with NAV
Tracking Error	A statistical measure (typically the standard deviation of return differences) showing how closely an ETF’s returns follow its benchmark index over time
Tracking Difference	The simple difference between an ETF’s actual return and its benchmark’s return over a specific period, distinct from tracking error’s statistical volatility measure
Premium/Discount to NAV	The amount by which an ETF’s market price is higher (premium) or lower (discount) than its NAV at a given point in time
Bid-Ask Spread	The gap between the highest price a buyer is willing to pay and the lowest price a seller will accept, a direct cost of trading an ETF
Expense Ratio	The annual fee, expressed as a percentage of assets, charged by the fund house to manage the ETF
Portfolio Composition File (PCF)	A daily disclosure listing an ETF’s exact underlying holdings, used by APs to execute creation and redemption transactions
Replication Method	The approach an ETF uses to track its index physical replication (holding the actual underlying securities) or synthetic replication (using derivatives to mimic performance)
Basket	The specific set of securities (or cash equivalent) that an AP delivers to, or receives from, the ETF issuer during creation or redemption

How the Creation-Redemption Mechanism Keeps Prices Aligned

Unlike traditional mutual funds, ETF units trade continuously on an exchange throughout the day, so their market price can drift away from their underlying NAV. The creation-redemption mechanism is what keeps that gap narrow:

When ETF price > NAV (premium): An AP buys the underlying basket of securities, delivers it to the ETF issuer, and receives new ETF units in exchange (creation). Selling these newly created units in the market increases supply, pushing the ETF’s price back down toward NAV.

When ETF price < NAV (discount): An AP buys undervalued ETF units in the market, redeems them with the issuer for the underlying basket of securities, and sells that basket (redemption). This reduces the ETF’s market supply, nudging the price back up toward NAV.

This arbitrage-driven process is why liquid ETFs typically trade very close to their NAV, even though ordinary investors cannot create or redeem units directly.

Understanding Tracking Error: A Formula

Tracking error is typically calculated as the standard deviation of the difference between an ETF’s daily (or periodic) returns and its benchmark index’s returns:

Tracking Error = Standard Deviation of (ETF Return − Benchmark Return), measured over a defined period

A lower tracking error indicates the fund is closely replicating its benchmark, while a higher tracking error suggests larger, more frequent deviations, which can stem from fund expenses, cash drag, rebalancing timing, or replication method.

Example of Tracking Error and Tracking Difference

Scenario: If the Nifty 50 Index yields 12.0% over a year and Fund A delivers 11.6%, the tracking difference is 0.4% (or 40 bps), representing the actual net drag from expenses and cash management.

Tracking Error Calculation: If the standard deviation of daily return differences between Fund A and the Nifty 50 across that year is 0.15%, the fund's tracking error is 0.15%, reflecting how consistently the fund mirrored the index on a daily basis.

Comparing Key Cost and Efficiency Metrics

Metric	What It Measures	Why It Matters to Investors
Expense ratio	Ongoing annual management fee	Directly reduces net returns over time; lower is generally better for passive index-tracking ETFs
Bid-ask spread	Cost of buying and selling in the secondary market	Wider spreads increase the effective cost of trading, especially for less liquid ETFs
Tracking error	Consistency of returns versus the benchmark	Indicates how efficiently the fund manager replicates the index
Premium/discount to NAV	Divergence between market price and fund value	Persistent premiums or discounts can signal liquidity issues or inefficient arbitrage in that ETF

Types of ETFs by Underlying Asset

ETF Type	What It Tracks
Equity ETF	A stock market index (e.g., Nifty 50, Sensex, sector or thematic indices)
Debt ETF	A basket of bonds or fixed-income instruments, including government securities
Gold ETF	The domestic price of physical gold, typically representing a fraction of a gram per unit
International ETF	Overseas indices or markets, offering exposure to foreign equities through a domestic listing

SEBI’s Regulatory Framework for ETFs

ETFs in India are regulated as a category of mutual fund schemes under the SEBI (Mutual Funds) Regulations, 1996, with additional operational guidance issued through SEBI circulars over the years. Key regulatory elements include:

Fund structure: ETFs must be registered and managed by a SEBI-registered Asset Management Company (AMC), subject to the same fiduciary and disclosure obligations as other mutual fund schemes.

Daily portfolio disclosure: SEBI mandates daily disclosure of the ETF’s portfolio holdings (the PCF), providing investors and APs with full transparency into the fund's holdings.

iNAV publication: Exchanges are required to disseminate real-time NAV during trading hours, calculated from data provided by the AMC and the underlying index, to help investors assess whether an ETF is trading at a fair price.

Authorised Participant framework: SEBI and the exchanges set eligibility norms for entities acting as APs and market makers, as their arbitrage activity is central to maintaining efficient ETF prices.

Tracking error disclosure: AMCs are required to disclose tracking error figures periodically, allowing investors to compare how efficiently different ETFs tracking the same index are managed.

Tax Treatment of ETFs in India

Following the tax changes introduced in the July 2024 Union Budget, ETF taxation depends significantly on the underlying asset class the fund holds:

ETF Type	Holding Period for LTCG	STCG Rate	LTCG Rate	Indexation Benefit
Equity ETF	More than 12 months	20% (Section 111A)	12.5% above ₹1.25 lakh annual exemption (Section 112A)	Not available
Debt ETF	More than 12 months (for listed units)	Applicable slab rate	12.5%	Not available
Gold ETF	More than 12 months (for units acquired on or after 1 April 2025)	Applicable slab rate	12.5%	Not available
International ETF	More than 12 months (listed units)	Applicable slab rate	12.5%	Not available

A few points worth noting for ETF investors:

Dividend/IDCW income from any ETF is added to the investor’s total income and taxed at the applicable slab rate, since Dividend Distribution Tax was abolished from FY 2020-21 onward.

Loss set-off rules apply consistently across ETF types: short-term capital losses can be set off against both STCG and LTCG from any capital asset, while long-term capital losses can only be set off against LTCG. This means a long-term loss on a gold ETF, for instance, can offset long-term gains on an equity ETF in the same financial year.

Securities Transaction Tax (STT) applies to equity ETF transactions on the exchange but does not apply to gold or silver ETF transactions.

Unused capital losses can generally be carried forward for up to 8 assessment years, provided the return is filed on time.

Conclusion

ETF terminology can seem dense at first, but each term ties back to a simple underlying idea: keeping the fund’s market price honest relative to what it actually holds. Concepts such as NAV, iNAV, tracking error, and the creation-redemption mechanism help explain how an ETF remains efficiently priced throughout the trading day.