Before investing in any fund, UK regulation requires that investors are given access to a standardised summary document — historically called the Key Investor Information Document (KIID), now being replaced across the market by the similarly structured Key Information Document (KID) — designed to present essential facts about a fund in a consistent, comparable format. Alongside the fund's own factsheet, this is one of the most useful, and most commonly skipped, pieces of homework before clicking "buy". This article explains how to read one properly.
Why these documents exist
Before standardisation, funds could present performance, charges, and risk information in whatever format and level of detail they chose, making it difficult for investors to compare funds on a like-for-like basis. The KIID (for UCITS funds) and KID (for a wider range of "packaged" retail investment products, including many investment trusts and structured products) were introduced to require every fund to disclose the same core information, in the same order, in a short, standardised document — typically no more than two or three pages.
The key sections of a KIID/KID
Objectives and investment policy
A plain-language description of what the fund is trying to achieve (for example, "to track the performance of the FTSE 100 Index" or "to achieve long-term capital growth by investing primarily in UK company shares") and the broad approach used to pursue that objective.
Risk and reward profile
A numerical risk indicator, historically on a KIID typically shown on a scale of 1 (lowest risk) to 7 (highest risk), based on the fund's historical volatility. Newer KID formats sometimes use a similarly structured but differently calibrated summary risk indicator. This is a measure of historical price fluctuation, not a guarantee of future risk or return, and a low score does not mean an investment cannot lose money.
Charges
A breakdown of the costs of investing, typically including any entry or exit charges (increasingly rare on modern platforms), the ongoing charges figure (the annual percentage taken from the fund for management and administration), and, in some formats, transaction costs associated with the fund's own trading activity.
Past performance
A bar chart typically showing the fund's calendar-year returns over the past several years (often up to ten), usually compared against its benchmark. This section always carries a standard warning that past performance is not a reliable guide to future performance.
Practical information
Details on how to buy and sell the fund, its tax treatment, and where to find further information, such as the full prospectus and annual reports.
Reading the risk indicator correctly
The numerical risk score reflects the fund's historical price volatility — how much its value has fluctuated up and down over time — rather than a complete measure of every type of risk the fund carries. Two funds with the same numerical score could carry quite different underlying risks (for example, currency risk, concentration risk, or credit risk) that are not fully captured by a single volatility-based number, and it is worth reading the fuller explanatory text alongside the number itself.
Comparing charges figures across documents
| Term commonly seen | What it generally covers |
|---|---|
| Ongoing Charges Figure (OCF) | Annual management and administration costs, as a percentage of fund assets |
| Total Expense Ratio (TER) | An older, broadly similar measure to OCF, still sometimes used |
| Transaction costs | Costs incurred by the fund buying and selling its underlying investments, disclosed separately in many newer documents |
| Entry/exit charges | Charges applied when buying or selling the fund itself, now uncommon on most mainstream funds sold via UK platforms |
It is worth checking whether a stated headline charge is the OCF alone, or a figure that also includes transaction costs, since these can differ meaningfully, particularly for funds that trade their portfolios more frequently.
Using the factsheet alongside the KIID/KID
While the KIID/KID is short and standardised, a fund's full factsheet (usually a separate, longer document, updated monthly or quarterly) typically provides considerably more detail, including the fund's largest individual holdings, sector and geographic breakdowns, manager commentary (for actively managed funds), and more granular historical performance data. Reviewing both together gives a fuller picture than either alone.
A worked example: comparing two KIIDs side by side
Suppose a hypothetical investor is comparing two global equity funds. Fund A's KIID shows a risk indicator of 6, an ongoing charges figure of 0.90%, and calendar-year returns that have varied considerably, sometimes well above and sometimes well below its benchmark. Fund B's KIID shows a risk indicator of 5, an ongoing charges figure of 0.15%, and calendar-year returns that closely track its stated benchmark index each year. From these documents alone, an investor can infer that Fund A is an actively managed fund taking positions that differ from its benchmark (explaining both its higher charge and more variable relative performance), while Fund B behaves much more like a passive index tracker (explaining its lower charge and closer tracking of the benchmark). Neither is presented as objectively better — the KIID simply helps the investor understand what kind of fund each one is before deciding which, if either, suits their own approach. This example is illustrative only.
Common mistakes when reading these documents
- Focusing only on past performance charts while skipping the charges and risk sections, even though past performance does not predict future results.
- Assuming a low numerical risk score means an investment is guaranteed not to lose money — all fund investments carry risk of loss.
- Overlooking whether the stated charge is the OCF alone or includes transaction costs, when comparing two funds.
- Not checking the "objectives and investment policy" section closely enough to confirm the fund invests as expected — fund names do not always fully describe their actual strategy.
The transition from KIID to KID
UK regulation has been moving funds from the older UCITS KIID format towards the newer, broader PRIIPs KID format, which applies to a wider range of retail investment products beyond traditional funds, including many investment trusts and structured products. The two formats cover broadly similar ground — objectives, risk, costs, and past performance — but differ in some technical details, including how the risk indicator is calculated and how future performance scenarios (rather than purely historical performance) are sometimes presented in the newer KID format. Investors researching funds during this transition period may encounter either format depending on the specific fund and its provider, and it is worth reading the specific document provided for the fund in question rather than assuming its exact layout.
Performance scenarios versus historical charts
Some newer KID documents present hypothetical "what if" performance scenarios (for example, showing potential outcomes under favourable, moderate, and unfavourable conditions) in addition to, or instead of, a simple historical bar chart. These scenarios are calculated using a standardised methodology based on the fund's historical volatility, and like all such projections, they illustrate a range of mathematically modelled possibilities rather than a specific prediction of what will actually happen.
Where else to find fund information
Beyond the KIID/KID and factsheet, a fund's full prospectus provides considerably more legal and operational detail, and annual and semi-annual reports provide a fuller account of the manager's activity, performance commentary, and complete financial statements. Most UK platforms also provide their own research pages summarising a fund's key facts, sometimes alongside independent ratings or commentary, which can be a useful supplementary resource alongside the fund's own official documentation.
Building a habit of reading before investing
Given how quick these documents are to read relative to the amount of standardised, comparable information they contain, making a habit of reviewing the KIID/KID and factsheet before every fund purchase — not just the first time, but each time a new fund is added to a portfolio — is a straightforward way to keep informed about exactly what is being bought, particularly as a portfolio grows to include more funds over time from different providers with different objectives and charging structures.
How these documents support comparison across fund types
Because the KIID/KID format is standardised across most retail fund types available to UK investors, including OEICs, unit trusts, many ETFs, and increasingly other packaged products, it provides one of the few genuinely like-for-like comparison tools available to ordinary investors, allowing a UK equity ETF, a UK equity OEIC, and a UK equity investment trust's associated KID to be reviewed side by side using the same structure and broadly comparable metrics, even though the three products have quite different underlying legal and trading structures, as covered elsewhere on this site.
What these documents cannot tell an investor
Despite their usefulness, a KIID/KID and factsheet cannot tell an investor whether a fund is the right choice for their own individual circumstances, objectives, and risk tolerance — that judgement depends on personal factors the documents are not designed to address. They are best understood as a starting point for research and comparison, to be used alongside a clear sense of one's own investment goals and time horizon, rather than as a complete substitute for that broader thinking.
Keeping documents up to date as funds evolve
A fund's KIID/KID and factsheet are updated periodically — typically the KIID/KID at least annually, and factsheets often monthly — meaning the version reviewed before an initial purchase may not reflect the very latest data by the time a subsequent top-up investment is made. Checking for the most recent version before adding further money to an existing holding, rather than relying on a document read some time ago, ensures the charges and risk information being relied upon remain current.
Key takeaways
- The KIID/KID is a short, standardised document that every UK fund must provide, covering objectives, risk, charges, and past performance in a consistent format.
- The numerical risk indicator reflects historical price volatility, not a complete or guaranteed measure of every risk the fund carries.
- Comparing ongoing charges figures — and checking whether transaction costs are included — helps make like-for-like cost comparisons between funds.
- Reading the KIID/KID alongside the fuller factsheet gives a more complete picture of a fund's actual holdings and strategy.
- Past performance charts always carry a standard warning that past performance does not predict future results, and this should be taken seriously when reviewing any fund.