--- title: "ETFs | How They Work and Why They Matter for Systematic." description: "Creation/redemption mechanism, tracking error, premium/discount to NAV, liquidity in Indian ETFs, and the full NSE ETF universe. By Tanmay Kurtkoti." source_url: "https://www.rupeecase.com/learn/path-6/module-6-4-etfs-how-they-work" --- [Path 06 4 of 9](/learn/path-6/)ETFs, How They Work and Why They Matter for Systematic Investors[Next 6.5](/learn/path-6/module-6-5-index-funds-vs-etfs-vs-active) Exchange traded funds are, for most investors, the most useful financial innovation of the last thirty years. They give you a whole index in one trade, at very low cost, and they trade on NSE and BSE like any share. In their index form they have beaten most active managers over long periods simply by costing less. India's [ETF](/learn/glossary#etf) market grew fast after 2015, when the Employees' Provident Fund Organisation began putting part of its new money into equity ETFs. Today ETFs cover broad indices, factors, sectors, gold, silver, government bonds and overseas indices, and in August 2026 alone they took in ₹10,161 crore of net new money (AMFI). Knowing how they work helps you pick a good one and, more importantly, avoid paying for a bad one. Most new ETF money in Aug 2026 went to equity ETFs, then gold 1. Other ETFs**Rs 327 crore** 2. Other ETFs**Rs 327 crore** 3. Other ETFs**Rs 327 crore** Net inflows, August 2026, AMFI monthly data published Sep 2026. Other ETFs is the remainder of the Rs 10,161 crore total. ## The creation and redemption mechanism: what makes ETFs different A mutual fund is priced once a day at [NAV](/learn/glossary#nav), and you deal at that NAV. An ETF trades all day at a live price set by buyers and sellers. So what keeps that price close to the value of the stocks inside it? The answer is **creation and redemption**, run by large players called authorised participants and market makers. They can exchange a big basket of the underlying stocks for new ETF units with the fund, or hand units back for the stocks. Retail investors cannot do this; they trade on the exchange. Since 2022 [SEBI](/learn/glossary#sebi) allows anyone other than market makers to deal directly with the AMC only for amounts above ₹25 crore. 1. **Price falls back to NAV**The extra supply closes the gap. The reverse happens at a discount. 2. **Price falls back to NAV**The extra supply closes the gap. The reverse happens at a discount. 3. **Price falls back to NAV**The extra supply closes the gap. The reverse happens at a discount. 4. **Price falls back to NAV**The extra supply closes the gap. The reverse happens at a discount. In liquid ETFs this keeps the price within a few paise of the indicative NAV, the iNAV that AMCs publish during market hours. In thinly traded ETFs, with few market makers and little volume, the mechanism is weak, and the price can drift well above or below the value of what you are buying. That is the risk most investors in Indian ETFs never check. [NSE, ETF market watch with traded value and iNAV](https://www.nseindia.com/market-data/exchange-traded-funds-etf) ## Tracking error: the real measure of ETF quality A [Nifty 50](/learn/glossary#nifty-50) ETF should deliver the Nifty 50's total return. In practice it delivers a little less. Two measures describe the gap: * **Tracking difference** is the gap in return over a period, such as one year: index TRI return minus ETF return. It is mostly cost. * **Tracking error** is the variability of the daily or monthly gap, how unevenly the ETF follows the index. SEBI requires AMCs to disclose it and caps it at 2% a year for index funds and ETFs, with exceptions for some indices. The causes are the [expense ratio](/learn/glossary#expense-ratio), cash held for redemptions and dividends, the timing of dividend reinvestment, and trading costs when the index changes. Compare ETFs on the same index by their tracking difference over one and three years, which AMCs publish on their websites and in factsheets. ## Premium and discount to NAV: the execution risk Liquid ETF #### Price stays near iNAV * Large daily traded value * Several active market makers * Spread of a few paise on a ₹250 unit Thin ETF #### Price can drift from value * Low daily traded value * Wide spread between bid and ask * Can trade at a premium in a rush, a discount in a sell off Tap a side: the same index, very different execution. When you buy an ETF you pay the market price, which may be above or below the iNAV. In a large, liquid broad index ETF the gap is usually tiny. In a thinly traded sector or thematic ETF, or in any ETF during a stampede, it can be one percent or more. In October 2025, when silver rallied hard, several silver ETFs traded at large premiums to their iNAV for days; buyers paid for excitement, not for metal. Run the defaults. On ₹5 lakh held for three years, a 0.10% expense ratio costs ₹1,500. A 0.5% premium on entry and 0.15% spreads each way cost ₹4,000, more than twice the fee you chose the ETF for. The practical rules: check the daily traded value on NSE before you buy, compare the live price with the iNAV, use limit orders, and avoid the first and last minutes of the session when spreads are widest. ## The Indian ETF universe: what is available | Category | Examples of underlying indices | Typical use | | --- | --- | --- | | Broad equity | Nifty 50, Nifty Next 50, Nifty 100, Nifty 500, BSE Sensex | Core equity holding, a benchmark you can own | | Factor or smart beta | Nifty Alpha 50, Nifty200 Momentum 30, Nifty100 Low Volatility 30, Nifty200 Quality 30 | A single factor without picking stocks | | Sector and thematic | Nifty Bank, Nifty IT, PSU and defence themes | Tactical tilts; check liquidity first | | Gold and silver | Domestic gold and silver prices | Diversification, with the costs of Module 6.9 | | Debt | Government and PSU bond indices, liquid overnight indices | Fixed income and parking cash | | International | Overseas equity indices, within RBI and SEBI limits on overseas investment | Global diversification, when limits allow new money | ## Factor ETFs: the bridge to systematic investing For readers of this library the most interesting category is **factor ETFs**, which track NSE's factor indices. They give you a documented factor, such as momentum or low volatility, in a cheap, liquid wrapper with no effort on your part. * **What you gain:** no stock by stock execution, a regulated fund structure, and tax treated as an equity fund. * **What you give up:** control. The index decides the universe, the number of stocks, the weighting and when it rebalances, typically twice a year for NSE's factor indices. A semi annual rebalance is slow for a fast signal like momentum. ## When ETFs are not the right tool ETFs solve one problem brilliantly: cheap, transparent index replication. They are not always the best answer. * **Very small amounts.** With ₹50,000 you cannot hold 50 stocks directly in sensible proportions; an ETF or [index fund](/learn/glossary#index-fund) is structurally better. * **Rules you want to control.** If you want a different rebalance frequency, number of names or universe, you need to hold the stocks directly. * **Tax harvesting.** An ETF is one holding. With direct stocks you can book a loss in one name and keep the rest, which an ETF does not allow. **Myth**An ETF costs only its expense ratio. **Fact**You also pay the bid and ask spread, any premium to iNAV, brokerage and STT on the exchange trade. In a thin ETF those can exceed years of expense ratio. ## Common mistake: market orders in thin ETFs The common mistake is placing a market order in a thinly traded ETF. The order walks up the order book and fills well above the iNAV. You have just paid a premium you will probably not get back. Always use a limit order near the iNAV, and if the spread is wide, wait or pick a more liquid ETF on the same index. The second mistake is buying the ETF with the lowest expense ratio and ignoring tracking difference and liquidity. A fund that charges 0.05% but trades at a 0.4% spread is the more expensive one for most investors. ## How this shows up in RupeeCase ETFs and RupeeCase strategies A RupeeCase strategy is like an index you hold stock by stock: the rule is published, and the stocks sit in your own demat instead of inside a fund. Compared with a factor ETF, that gives you the strategy's own rebalance cadence, every 1 to 4 weeks instead of twice a year, and the ability to see every holding and every trade. The trade off is cost structure and capital: the fee is 0.2% of traded value per rebalance, and each strategy needs a minimum amount to buy one share of each holding. Some multi asset strategies hold their gold and debt sleeves through exchange traded instruments. Compare the approaches on the [Dynamic Asset Allocator](/strategies/dynamic-asset-allocator) page, and the fees on the [fee calculator](/fee-calculator). ## Questions readers ask Is an ETF better than an index fund?ETFs usually cost less and trade during the day, but you need a demat account, you pay spreads and you can buy at a premium. Index funds deal at NAV with no spread and suit monthly SIPs. Module 6.5 compares them in detail. How do I check if an ETF is liquid?On the NSE ETF page, look at the traded value for the day and the gap between the last price and the iNAV. A large daily traded value and a price within a few paise of iNAV are good signs. How are equity ETFs taxed?Equity ETFs are taxed like listed shares: 20% on gains within 12 months and 12.5% on long term gains above ₹1.25 lakh a year. Gold, debt and international ETFs follow different rules. What does ETFs, How They Work and Why They Matter for Systematic Investors cover?ETFs look simple from the outside, buy them like a stock, own a basket of securities. The mechanics underneath are more interesting, and understanding them is essential for anyone building a systematic strategy using ETFs. It works through The creation and redemption mechanism: what makes ETFs different, Tracking error: the real measure of ETF quality, Premium and discount to NAV: the execution risk, The Indian ETF universe: what is available and more. It is module 6.4 of Path 6, Indian Financial Products, about 8 minutes of reading, free. TTry it ## ETFs: How They Work and Why They Matter for Systematic Investors, in numbers. Annualised drift between fund return and index return Your numbers, the module's formula, nothing stored. Calculator ### ETF Tracking Error Estimator Tracking error is the standard deviation of (fund return minus index return). Lower is better. Indian large-cap ETFs sit in 5 to 30 bps; smallcap ETFs run wider. Annualised fund return (%)Annualised index return (%)Daily return correlationAnnualised volatility of fund (%)Annualised volatility of index (%) [Full calculator: Expense ratio impact](/learn/tools/expense-ratio-calculator)[Full calculator: Tracking error](/learn/tools/tracking-error-calculator) AApply it on RupeeCase ## Large Cap Multi Asset 20 largecap stocks plus LiquidCase and GoldBees. 80/10/10 multi-asset on the Nifty 100. An index built on the rules this path teaches, largecap equity plus debt and gold, conservative core, held stock by stock in your own demat. Risk band: Moderately High. [See the strategy](/strategies/largecap-multi-asset)[Sign up for RupeeCase](https://invest.rupeecase.com/signup?strategy=largecap-multi-asset) [CAGR24.4%Sharpe1.32Max DD−21.0%Minimum125000Model, back tested, as of 27 Apr 2026. Not client returns, not a promise.](/strategies/largecap-multi-asset) QQuick check ## 10 questions, 7 to pass. Pick an answer and the explanation appears. Your result stays on this device and counts towards the Path 06 certificate. CCheck yourself ## Path 06 so far. Your quick check results on this device, stop by stop. 1. [TPath test, 28 questionsNot yet](/learn/path-6/module-6-9-gold-commodities-international#pathTestSection) 2. [TPath test, 28 questionsNot yet](/learn/path-6/module-6-9-gold-commodities-international#pathTestSection) 3. [TPath test, 28 questionsNot yet](/learn/path-6/module-6-9-gold-commodities-international#pathTestSection) 4. [TPath test, 28 questionsNot yet](/learn/path-6/module-6-9-gold-commodities-international#pathTestSection) 5. [TPath test, 28 questionsNot yet](/learn/path-6/module-6-9-gold-commodities-international#pathTestSection) 6. [TPath test, 28 questionsNot yet](/learn/path-6/module-6-9-gold-commodities-international#pathTestSection) 7. [TPath test, 28 questionsNot yet](/learn/path-6/module-6-9-gold-commodities-international#pathTestSection) 8. [TPath test, 28 questionsNot yet](/learn/path-6/module-6-9-gold-commodities-international#pathTestSection) 9. [TPath test, 28 questionsNot yet](/learn/path-6/module-6-9-gold-commodities-international#pathTestSection) 10. [TPath test, 28 questionsNot yet](/learn/path-6/module-6-9-gold-commodities-international#pathTestSection) Explore next ## Put the module to work. * [GuideDirect indexing in India: owning the index stock by stockShares instead of units: the costs, the tax, the tracking error and who it suits.](/guides/direct-indexing-india) * [CalculatorExpense ratio impactFree, with the formula and a worked example](/learn/tools/expense-ratio-calculator) * [CalculatorTracking errorFree, with the formula and a worked example](/learn/tools/tracking-error-calculator) * [StrategyLarge Cap Multi Asset strategyNifty 100, 22 stocks, every 4 weeks](/strategies/largecap-multi-asset) * [Free module 6.5Index Funds vs ETFs vs Active, The Evidence in India8 min read](/learn/path-6/module-6-5-index-funds-vs-etfs-vs-active) * [Learn guideIndian Stock Markets Explained: NSEA pillar guide across the paths](/learn/indian-markets) Community ## Join my WhatsApp group. Scan the code, fillFill one short form, and join my WhatsApp group. Slides, sources, factsheets and the rebalance logs live there, and members join a daily Google Meet with me. [Sign up for RupeeCase](https://invest.rupeecase.com/signup) [Join the WhatsApp group](https://forms.gle/C6HMtM1Z2GfeocQV7) [One form, one group](https://forms.gle/C6HMtM1Z2GfeocQV7)Scan with your phone camera SSources ## Where the figures come from. 1. [NSE Indices, factor index methodologies](https://www.niftyindices.com/) 2. [NSE Indices, factor index methodologies](https://www.niftyindices.com/) 3. [NSE Indices, factor index methodologies](https://www.niftyindices.com/) 4. [NSE Indices, factor index methodologies](https://www.niftyindices.com/) GTerms ## 5 terms from this module. [ETF](/learn/glossary#etf)Exchange Traded Fund, a basket of securities (typically tracking an index) that trades on the stock exchange like a single share. Priced continuously during market hours. Creation/redemptionThe arbitrage mechanism through which Authorised Participants keep ETF market price aligned with NAV by creating or redeeming large blocks of ETF units in exchange for the underlying securities. [Tracking error](/learn/glossary#tracking-error)The difference between an ETF's actual return and its benchmark index return. Arises from expense ratio, cash drag, dividend timing, and rebalancing costs. Premium/discountWhen an ETF's market price trades above (premium) or below (discount) the NAV of its underlying portfolio. Common in illiquid ETFs with low daily trading volume. Authorised ParticipantA large institutional player (typically a bank or broker-dealer) who has a contract with the ETF provider to create and redeem large blocks of ETF units, maintaining price-NAV alignment. [All 91 terms in the glossary](/learn/glossary) [From the podcast archiveEP30: Sensex Expiry. Sell The Straddle. Brent CooledThe Tanmay Edge, 30 Apr 2026, graded 2/5](/podcast/episodes/2026-04-30)[Pillar guideIndian Markets14 modules across paths 1, 6](/learn/indian-markets) Education only, not investment advice. RupeeCase is a technology platform operated by QC Alpha Technologies Pvt Ltd; it is not a fund, a PMS or a SEBI registered investment adviser. Model returns are back tested and not a promise of future returns. Figures carry the date they were checked.