ETFs have been the most widely bought investment product among European retail investors for a decade, and probably the one whose inner workings are least known to the people who hold them. This guide describes the mechanics: what the fund actually contains, where its charges are written down, what its name means, and which risks its structure carries. It does not compare products and names none.
Definition
ETF (exchange traded fund, also called a tracker): an investment fund whose units are bought and sold on an exchange throughout the day, like a share, and whose management most often aims to reproduce a reference index rather than selecting securities.
A fund that trades like a share
Two things are combined in an ETF, and it is their combination that makes it distinctive.
The first is that it is a fund. When you buy a unit, you are not buying a security: you are buying a fraction of a collectively held portfolio. If the index tracked contains 500 companies, a single unit gives you economic exposure to those 500, directly if the fund holds the securities (physical replication), or through a swap contract if it tracks the index differently (synthetic replication, covered below). Legal forms vary (often a fund or a SICAV), but all carry the same custodian and valuation obligations as a conventional fund.
The second is that it is listed. A traditional fund is bought once a day, at a price you do not know when you place the order. An ETF is bought continuously during market hours, at the displayed price, with an order book, a spread between bid and offer, and brokerage fees charged by your broker on every transaction.
That second characteristic has a practical consequence that is often overlooked: on small regular contributions, fixed brokerage fees can weigh far more than the fund's own charges. A €2 order on a €100 contribution is 2% gone immediately, when the fund's annual charges are in the order of a few tenths of a percent. The two are read separately, and the first depends on your broker, not on the fund. The guide on dollar cost averaging puts figures on what that floor represents at different contribution sizes.
Three prices coexist, and they are not the same
A frequent source of confusion: when people talk about the "price" of an ETF, three different quantities may be meant.
Definition
Net asset value (NAV): the accounting value of one unit, worked out by adding up everything the fund holds, deducting what it owes, and dividing by the number of units in issue. It is published once a day, after the close.
The index is the reference, a list of securities with weights, published by an index provider. It is not investable as such: it bears no charges, no tax and no liquidity constraint.
The net asset value is what the unit is worth in accounting terms. It lags the index by everything the fund has paid in order to track it.
The market price is what someone is willing to sell you or buy from you the unit for right now. It moves around the net asset value without matching it exactly: the difference is called a premium when the price is above and a discount when it is below. In calm conditions the gap is a few hundredths of a percent on heavily traded indices. It widens when the underlying market is closed, when volatility rises, and at the open and close of the session.
How the fund tracks the index
Tracking an index looks simple, and stops being simple as soon as the index contains thousands of lines, markets in different time zones, or thinly traded securities. Three methods exist, and the fund's regulatory document states which one is used.
| Method | What the fund holds | What this implies |
|---|---|---|
| Full physical | Every line in the index, at its index weight | The most transparent. Expensive to maintain on very broad indices, because each rebalancing triggers transactions. |
| Physical sampling | A subset chosen to behave like the index | Lower transaction costs, but the gap to the index can be less regular, in either direction. |
| Synthetic | A basket of securities with no necessary link to the index, plus an exchange contract | Often very tight tracking, including on markets that are hard to access. In return, performance depends on a contractual undertaking given by a bank. |
None of the three is defective: they answer different constraints. What matters is knowing which one applies to the fund you hold, because the nature of the risk differs. With physical replication, if the market falls, the fund falls. With synthetic replication, you have to add the question of how solid the contract's counterparty is, a question that UCITS rules limit but do not remove.
Synthetic replication also has a very concrete use in France: it allows a PEA, whose eligible securities are essentially European, to be exposed to non-European indices, since the basket held can be European while the return exchanged is global. That is a mechanism, not a suggested use.
Ongoing charges: what is written, and what is taken
Definition
Ongoing charges (sometimes shown as TER, for total expense ratio): the annual percentage the fund takes from its assets. It appears on no statement and is never debited: it is removed continuously from the net asset value. It does not cover the whole of the costs: the fund's internal transaction costs and any entry or exit fees are excluded. The Key Information Document (KID), in the PRIIPs format, gives the complete cost-by-cost view.
This is the least well perceived item, precisely because it is invisible. You will never see a "management fee" line on your broker statement. The deduction happens inside the fund, a little each day, and shows up only as a performance gap against the index.
In first-year euros, on €10,000 held, the order of magnitude is immediate.
| Annual ongoing charges | First-year cost on €10,000 |
|---|---|
| 0.05% | €5 |
| 0.20% | €20 |
| 0.50% | €50 |
| 1.00% | €100 |
| 1.80% | €180 |
Those amounts look modest. What is not modest is how they accumulate: every euro taken in one year produces nothing in the years that follow, which the guide on compound interest sets out. Over two decades, a 1.6 point difference in charges takes close to a third of the outcome.
The factual reading of that chart is this: charges are not subtracted from the result, they compound against it. It is an arithmetic observation, true of any financial product whatever its category. It says nothing about the future performance of any particular fund, and low charges are no guarantee of a result: they are simply the one term of the contract you know in advance with certainty.
Tracking gap: the fund never matches exactly
Over a year, a fund almost never delivers exactly its index return. Two distinct measures describe this, and they are often confused.
Definition
Tracking difference: the performance gap observed over a period, in percent. It is usually negative, by the amount of the charges, but it can be positive, for instance when the fund lends its securities and earns income from doing so.
Tracking error: how regular that gap is, measured by its standard deviation. A fund consistently 0.20% behind is highly predictable; a fund sometimes 0.4% ahead and sometimes 0.5% behind is much less so, even if its average is better.
The causes are identifiable: ongoing charges, transaction costs when the index rebalances, withholding tax on foreign dividends that the fund does not always recover in full, the lag between a dividend going ex and being reinvested, and for sampled funds the behavioural gap between the sample and the full index.
Distributing or accumulating: same performance, two treatments
The companies the fund holds pay dividends. The fund has to do something with them, and there are two answers, very often offered on the same index under two different share classes.
| Distributing (Dist, D) | Accumulating (Acc, C) | |
|---|---|---|
| What the fund does | Pays the dividends out in cash, at regular intervals | Reinvests them inside the fund |
| What you see | Cash arriving in your account, and a price that does not include it | No cash flow, and a price that rises more |
| Economic performance | Identical before frictions, since the underlying portfolio is the same | |
| In a French taxable account | Each payment is taxable in the year it is received | No tax until the units are sold |
| In a PEA or a life insurance contract | No annual tax in either case, as long as nothing is withdrawn | |
The worked figure is simple. A 2% dividend on €10,000, that is €200, in a French taxable account: the distributing version leaves you €137.20 net to reinvest after the 31.4% flat tax, the accumulating version reinvests the full €200 with no immediate tax. The first-year gap is €62.80, and it recurs every year on a base that grows.
This is not a one-way trade-off
Deferred tax is not a permanent gain: it is caught up on sale, on a capital gain that has become larger. Conversely, income paid out may be exactly what someone living off their portfolio is looking for. The two versions answer different situations, and the choice depends on your account type, your marginal rate and your horizon. PulseMyPortfolio describes both mechanisms and does not decide for you.
Reading an ETF name
The names are long because they are descriptive. Each fragment answers a question, and once the code is known the name reads from left to right.
| Fragment | What it tells you |
|---|---|
| Asset manager name | The issuer of the fund, which runs it |
| Index name | The reference tracked, with its geography and scope |
| UCITS | The fund complies with the European directive of that name, which imposes rules on diversification, liquidity and custody |
| ETF | The units are exchange traded |
| Acc or C | Accumulating: dividends are reinvested |
| Dist or D | Distributing: dividends are paid out |
| A currency (EUR, USD) | The unit's accounting currency, which is not the actual currency risk: that comes from the currency of the securities held |
| Hedged or EUR Hedged | Currency risk is covered by a dedicated mechanism, whose cost is built into the fund |
| The ISIN code | The unique identifier of the share class, the only piece of data that cannot be confused between two similar listings |
That last point deserves a word. Two versions of the same index, one distributing and one accumulating, carry almost identical names. The ISIN code is what separates them, and it is the one to check when entering a position or comparing two listings.
The three-page document that holds the essentials
Definition
KID (key information document, DIC in French): a standardised regulatory document, three pages at most, that the issuer must publish and keep current for each share class. Its structure is prescribed, which makes two funds directly comparable line by line.
It contains, in this order: the nature of the product and its objective, the summary risk indicator, performance scenarios, a cost breakdown, the recommended holding period and how to exit.
The summary risk indicator is a score from 1 to 7 derived from past volatility and credit risk. It is useful for sorting, and limited in what it says: it measures the size of the swings observed, not the probability of losing capital, and it is computed on past data.
The performance scenarios need to be read for what they are: regulatory projections computed by a prescribed method from the product's history. They are not a forecast. The guide on the limits of a projection explains why any projection, including the one PulseMyPortfolio computes, describes an assumption and not a future.
The risks the structure carries
An ETF removes no market risk: it organises how risk is spread. Holding 500 companies instead of one removes the risk specific to a single company, not the risk of the market as a whole. If the index falls 30%, the fund falls about 30%.
On top of market risk sit risks attached to the structure itself, which are better known by name.
| Risk | Where it comes from |
|---|---|
| Index concentration | A market-cap weighted index can end up with a handful of companies making up a very large share of the total. The diversification implied by the number of lines is not the diversification of actual weights. |
| Currency | A dollar-denominated index held by a euro investor is exposed to moves in the exchange rate, independently of the market tracked. |
| Counterparty | With synthetic replication, a third party's contractual undertaking enters the equation. |
| Liquidity | On narrow indices or at quiet hours, the gap between the buying and selling price widens, and it is paid on every transaction. |
| Securities lending | Some funds lend their holdings to generate incidental income. The practice is regulated and collateralised, and it is disclosed in the fund's documents. |
| Fund closure | A fund whose assets stay small can be liquidated or merged. That is not a loss of capital, but it can trigger a sale you did not choose, with its tax consequences. |
The accounts that can hold them, in France
In France, the same fund does not behave the same way for tax purposes depending on the account holding it. The rules below are the ones in force and depend on no judgement.
| Account | What it accepts | Tax on gains |
|---|---|---|
| Ordinary securities account | Every venue and every fund the broker gives access to | 31.4% flat tax on sale, or the progressive income tax scale by election |
| PEA | Eligible securities only: shares of companies in the EU or EEA (Norway, Iceland, Liechtenstein), plus funds meeting the eligibility criteria (including the 75 % threshold), which includes synthetic funds exposed to other regions | After the plan has been held five years, only social levies (18.6% since 2026) remain due on gains |
| Life insurance | The unit-linked options the insurer offers, a closed list | Tax rules specific to the contract, with wrapper charges on top of the fund's own |
The last row is the one most often forgotten: inside a life insurance contract, two layers of charges sit on top of one another, the fund's and the contract's. The total is what counts, and it is never shown added up anywhere.
What PulseMyPortfolio does with them
The app records your ETF units like any other holding: a quantity, a date, a purchase price, fees. It then works out the weighted average cost using the method the French tax authority applies, tracks the dividends paid by distributing share classes, and consolidates everything into your net worth. Broker statements can be imported to avoid manual entry.
What it does not do: it does not rank funds, offer any, say whether your allocation is suitable, or suggest any transaction. It shows what you hold and what it produces. Every calculation runs on your device, as the guide on local-first financial data explains; activating a licence is the only moment a connection is required.
Frequently asked questions
What is the difference between an ETF and a tracker?
None. "Tracker" is the everyday term and "ETF" the regulatory acronym. Both describe the same object. A non-listed index fund also exists: it tracks an index but does not trade on an exchange, and is bought once a day from the asset manager.
Can an ETF lose all its value?
A unit's value follows the index, so the market: it can fall sharply, like any equity investment. A total loss would require every company in the index to be worth nothing. A fund can, however, be closed and liquidated, which returns your units as cash at the price of the day, without letting you choose the date.
What happens if the asset manager goes bankrupt?
The assets of a UCITS fund are held by a custodian separate from the asset manager and are not part of its balance sheet. The manager's failure leads to the fund being transferred or wound up, not to the securities it holds disappearing. That separation is one of the main contributions of the UCITS framework.
Is a distributing or an accumulating ETF preferable?
That depends on your account type, your need for income and your horizon, in other words on your personal situation. The table above describes what each version does and what it triggers for tax; the choice is a matter of personal advice, which PulseMyPortfolio does not provide.
Are ongoing charges taken even when the fund falls?
Yes. They apply to assets, not to performance. A fund that loses 10% over the year and charges 0.30% takes that 0.30% from the value remaining.
Why is the quoted price not exactly the net asset value?
Because the price results from orders meeting in real time, whereas the net asset value is an accounting figure published once a day. Specialist intermediaries create and redeem units to keep the two close. The gap widens when the underlying market is closed or very unsettled.
Does a hedged ETF remove currency risk?
It reduces it without removing it, and it carries a cost built into the fund that varies with the interest rate differential between the two currencies. Hedging protects against an adverse move in the exchange rate just as much as it gives up a favourable one.
How long should an ETF be held?
The KID states a recommended holding period, worked out by the issuer from the product's risk profile. It is not an optimal duration and it is not a recommendation about you.
How do I enter an ETF in PulseMyPortfolio?
Like any security holding: identifier, quantity, date, unit price, brokerage fees. The ISIN code is the most reliable reference, because it tells the distributing and accumulating versions of the same index apart without ambiguity.
Does PulseMyPortfolio recommend ETFs?
No, and it will not. The app is a tracking and calculation tool. Issuing a personal recommendation on a financial instrument is investment advice, an activity reserved in France to authorised professionals. PulseMyPortfolio describes mechanisms and computes what you enter.
Information, not advice
This guide describes how a category of financial products works. It is not investment advice, not a personal recommendation, and not an inducement to buy or sell any financial instrument. PulseMyPortfolio is not an investment adviser and is not registered with the AMF in that capacity. For guidance suited to your situation, speak to an authorised professional. Tax figures reflect the 2026 rules and may change. Last updated: 26 August 2026.