OCF
Useful, but not decisive on its own.
- A lower OCF is good, but not if the fund is doing the wrong job.
- Tracking difference and securities lending can matter as much as the fee line.
- Do not mistake the cheapest fund for the cleanest choice.
By the UK Tax Drag editorial team · Reviewed
Research snapshot
Use this page when you are holding a factsheet in front of you and want to know which lines matter most before committing capital.
Last reviewed
22 April 2026
Who this is for
UK ETF investors choosing between broadly similar funds and trying to avoid lazy ticker-level comparisons.
Primary sources
Issuer factsheets, KIDs, annual reports, and the site rates reference.
The order to read a factsheet
| Read this first | Why it matters | Common mistake |
|---|---|---|
| Fund objective and index tracked | This tells you the actual job of the ETF before you even care about fees. | Comparing two funds that are not solving the same problem. |
| Domicile, structure and replication | This affects tax treatment, counterparty exposure, and how closely the fund may behave to the headline benchmark. | Assuming every ETF is just a physically held basket of shares. |
| Holdings and sector concentration | The top ten holdings often reveal whether you are buying genuine diversification or a narrow style tilt. | Buying a "global" label that is really a concentrated US mega-cap exposure. |
| Distribution policy and wrapper fit | Accumulating versus distributing matters more outside wrappers than many people realise. | Treating acc and dist funds as interchangeable in a GIA. |
What the headline numbers do and do not tell you
Cost
Yield
Headline income can hide structural trade-offs.
- Ask whether the yield is coming from dividends, bond coupons, or option overlays.
- Higher distribution does not automatically mean better total return.
- Read the strategy note before comparing payout lines.
Professional default: read objective, index, holdings, distribution policy, domicile, and replication before you spend any time on the marketing chart.
The six checks that prevent most bad ETF choices
- Make sure the fund objective matches the role you want it to play.
- Check whether the index is broader or more concentrated than the label suggests.
- Read the top holdings and country weights.
- Check acc versus dist and wrapper fit.
- Check domicile, replication method, and whether securities lending is used.
- Only then compare cost, size, spread, and issuer preference.
Every line on the factsheet and KID, explained
A UK-listed ETF normally comes with two short documents: the issuer factsheet (one or two pages of marketing-style data) and the Key Information Document, or KID, which is a regulated three-page disclosure. Read them together. Here is what each line is actually telling you.
| Line on the document | What it means in plain English | Why it matters |
|---|---|---|
| OCF / TER | The Ongoing Charges Figure (called the Total Expense Ratio on older sheets) is the annual percentage the fund deducts for management, admin and custody. A 0.20% OCF costs roughly £20 a year on a £10,000 holding. | It is a recurring drag taken daily from the fund's value, not billed to you. Lower is better for the same job, but it is not the whole cost of ownership. |
| Index tracked | The benchmark the fund aims to replicate, such as a developed-world, all-world or single-country index. The exact index name tells you whether emerging markets and small caps are included. | Two "global" funds tracking different indices can hold very different things. The index, not the fund name, defines the exposure. |
| Replication method | Physical full replication holds every index constituent; physical sampling (optimised) holds a representative subset; synthetic uses a swap contract with a bank to deliver the index return. | Synthetic funds add counterparty risk but can track hard-to-reach markets cheaply. Sampling can introduce small tracking gaps. Neither is automatically wrong. |
| Domicile | Where the fund is legally registered — for UK retail investors this is almost always Ireland or Luxembourg. | Domicile drives the tax treatment of the dividends the fund receives, especially on US shares (covered below). |
| Distribution policy | Accumulating (Acc) reinvests income inside the fund; distributing (Dist) pays it out as cash, usually quarterly or semi-annually. | Inside an ISA or SIPP the choice is about convenience. In a General Investment Account it changes how and when you are taxed. |
| Fund size / AUM | Total assets under management in the fund. | Very small funds (broadly under £100m) carry a higher risk of closure or merger, which can force an unplanned disposal. Large funds tend to trade with tighter spreads. |
| Tracking difference / error | Tracking difference is how far the fund's actual return fell behind (or ahead of) the index over a period. Tracking error is how consistently it deviates. | This is the real-world cost of owning the tracker. A fund with a slightly higher OCF but lower tracking difference can be the cheaper holding in practice. |
| Top holdings & concentration | The largest positions, usually the top ten, plus the percentage of the fund they represent. | A market-cap world index can have 20%+ in its ten biggest names and a heavy US mega-cap tilt. The top ten often tell you the truth the label hides. |
| UCITS & UK Reporting Status | UCITS is the EU regulatory standard most UK-listed ETFs follow. UK Reporting Status is HMRC's confirmation that gains are taxed as capital gains rather than income. | Without reporting status, gains on a non-UK fund can be taxed at higher income-tax rates as an "offshore income gain". Reporting status protects the more favourable CGT treatment. |
| SRI (risk indicator) | The Summary Risk Indicator on the KID, a single number from 1 (lowest) to 7 (highest) based mainly on past volatility. | A broad equity fund usually sits around 4–6; a short-dated bond fund lower. It is a rough comparator, not a forecast of loss. |
| Bid–offer spread | The gap between the price you buy at and the price you sell at, quoted on-exchange. | This is a one-off cost on every trade. On a large, liquid fund it is tiny; on a niche fund it can quietly exceed a year's OCF. |
What actually matters most: for a long-term core holding, the index tracked, the domicile, and the real tracking difference usually matter more than shaving a basis point off the headline OCF. For anything you will trade often or hold in small size, the spread and fund size deserve equal weight.
Domicile, US withholding tax and the risk indicator
The single line most UK investors skip is domicile, and it has a real cost. When a fund holds US shares, the US levies a withholding tax on the dividends those shares pay before the money ever reaches the fund. An Ireland-domiciled fund benefits from the US–Ireland tax treaty and suffers 15% withholding on US dividends. A fund domiciled somewhere without a favourable treaty can suffer the full 30%. This is invisible on the price chart but compounds against you year after year, which is why the great majority of ETFs marketed to UK investors are domiciled in Ireland (and a smaller number in Luxembourg). You cannot reclaim this layer of tax yourself — it is settled inside the fund — so the only lever you have is choosing a well-domiciled fund in the first place.
The same logic explains why holding a US-domiciled ETF directly (the kind with a three-letter US ticker) is usually impractical for UK retail investors: most UK platforms cannot offer them without a Key Information Document, and they bring US estate-tax and W-8BEN paperwork that an Ireland-domiciled equivalent avoids entirely. Our withholding-tax guide walks through the detail.
The Summary Risk Indicator (SRI) on the KID deserves a clear-eyed reading too. It is a 1-to-7 scale calculated largely from how volatile the fund has been, so it is backward-looking by design. A fund can carry a comfortable-looking middle score and still fall heavily in a crisis, because volatility in calm years understates tail risk. Treat the SRI as a way to rank funds against each other, not as a promise about the worst case. Pair it with the KID's own "what could happen" performance scenarios and, for bond funds, with the stated duration, which tells you how much a rise in interest rates would hurt.
Finally, read the small print on securities lending. Many physical ETFs lend out some of their holdings to generate extra income, part of which is returned to the fund (and can quietly improve tracking). It is generally collateralised and low-risk, but it is not zero-risk, and the revenue split between the fund and the manager varies. The factsheet or the annual report will say whether lending is used and how the income is shared — a detail worth a glance before you commit a long-term core holding.
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