Key takeaways
- Vanguard's FTSE 250 UCITS ETF disclosed a 0.10% ongoing charge and 0.26% of dealing costs inside the fund at 31 December 2025. The advertised number is the smaller one.
- On a £50,000 ISA split 80/20 between a global tracker and that ETF, a 0.20% headline became 0.65% a year once fund dealing costs and a 0.35% platform charge were counted.
- Held for 30 years, a 0.20% drag gives up 5.94% of the final pot and a 0.65% drag gives up 17.87%, a gap of 11.93 percentage points that does not depend on returns.
- Outside a tax wrapper, a 1.17% quoted historic yield taxed at the 35.75% higher dividend rate costs 0.42% a year, nearly twice the fund's own 0.23% ongoing charge.
- Two Vanguard cost documents dated 28 July 2026 disclose different dealing costs for the same fund: 0.09% in one, 0.00% in the other.
The ongoing charge is one line on a bill with six lines
You looked up a fund, saw a number like 0.23%, and want to know what you actually hand over. The short answer: that figure is one line of the bill, and on a normal UK portfolio it isn't the largest one.
Here's the whole sum, and the rest of this piece is where each layer comes from. Take a £50,000 stocks and shares ISA holding 80% Vanguard's FTSE Global All Cap Index Fund and 20% its FTSE 250 UCITS ETF, on a platform charging 0.35% a year. The weighted ongoing charge is 0.20%. The dealing costs the two funds incurred inside themselves, disclosed as at 31 December 2025, add 0.10%. The platform's 0.35% is the third layer. Total: 0.65% a year, or £327 in the first year against the £102 the headline implies.
That's 3.2 times the advertised figure. None of it is hidden and none of it is illegal. It's just published across five separate documents, in four different formats, by three different companies.
What the ongoing charges figure is designed to exclude
The ongoing charges figure, or OCF, is a fund's running costs expressed as a percentage of assets. Vanguard's factsheet for the FTSE Global All Cap Index Fund spells out the scope: it "covers administration, audit, depository, legal, registration and regulatory expenses incurred in respect of the Funds."
Read that list again for what's missing. Nothing in it is the cost of buying and selling shares. A fund that trades its portfolio pays brokers, crosses spreads and hands over transfer taxes, and none of that lands in the OCF. That isn't an oversight. It's the definition.
The FCA said so in its 2017 asset management market study, in a sentence that has aged well: "We found that firms do not disclose some charges, particularly transaction costs, to investors before they make their investment decisions." The same report restated an interim finding that charges paid to third parties appointed by asset managers "constitute around 20% of the total fund charges, although there is significant variance around this average."
The rules moved after that. The FCA's conduct rules now require a firm to give clients "an illustration showing the cumulative effect of overall costs and charges on the return of the client's investment in the financial instrument." The data exists. It just doesn't sit next to the number in the fund search box.
The fund's own dealing costs can be larger than its charge
Vanguard publishes what those dealing costs came to. In its UK costs and charges document, "the report is dated 28 July 2026" and "the transaction costs data is as at 31 December 2025."
The FTSE 250 ETF is the striking case. Its row reads 0.10% ongoing costs and 0.26% transaction costs. The cost you can't see on the product page is 2.6 times the one you can. Add them and the fund cost 0.36% before a platform touched it.
The global tracker looks tamer: 0.23% ongoing, 0.06% transaction costs. That gap between the two funds is not about competence. It's about what they hold. Vanguard's definition of the disclosed figure includes "broker commissions, entry and exit charges, spreads, stamp duty, transactions tax and foreign exchange costs" — and a FTSE 250 fund buys UK shares, where "you usually pay a tax or duty of 0.5% on the transaction."
So a large slice of that 0.26% is a tax, and it only lands when the fund trades. Turnover is the thing to watch: the global tracker's turnover rate was 13% in the year to 30 April 2026, which is why its dealing bill is small. Actively managed funds trade more. Vanguard's own Global Emerging Markets fund, an active one, disclosed 0.78% ongoing and 0.35% transaction costs, for 1.13% before the platform charge.
On an ETF there's a spread, and you pay it on the way in
An exchange-traded fund is bought from a market maker, not from the fund manager, so there are two prices: one to buy and a lower one to sell. The difference is a cost, and it's charged once per trade rather than every year.
Vanguard discloses it: "Vanguard ETFs incur one-off costs in the form of a Bid-Offer Spread on any trades made. We estimate the spread using a rolling 30-day average per fund which may differ from the actual spread incurred." For the FTSE 250 ETF that estimate was 0.05%. For the FTSE Emerging Markets ETF it was 0.09%, alongside 0.17% ongoing and 0.08% transaction costs.
On the £10,000 ETF slice in the worked example, 0.05% is £5 — trivial if you buy once and hold, and not trivial if you rebalance quarterly. The layer is also the one the official statistics skip. ESMA's 2025 costs and performance report, published in March 2026, says so directly: "Due to lack of data availability, this analysis does not include information on bid-ask spreads."
The platform charge is usually the biggest single line
Hargreaves Lansdown's published ISA tariff charges 0.35% on funds for the first £250,000, and 0.35% on shares and ETFs "capped at £12.50 per month." On the £50,000 portfolio that's £175 a year — more than the two funds' ongoing charges and dealing costs put together. Trading is extra: £1.95 for a one-off fund trade, £6.95 for a share trade.
This is the layer with the widest spread between providers and the one a household controls most directly, because the tariff is a choice rather than a property of the asset. Where a flat monthly fee overtakes a percentage depends on portfolio size, and the crossover arithmetic is worked through in our guide to where a flat platform fee overtakes a percentage one. ESMA's first full accounting of EU fund costs, published in November 2025, put the distribution layer — platforms, advisers and brokers — at 48% of UCITS total costs.
Currency gets charged twice, and only one of the two is inside the fund
A global fund converts currency constantly, and that cost is already inside the disclosed transaction costs — Vanguard's definition names "foreign exchange costs" explicitly. You don't pay it twice on a sterling-denominated fund.
You do pay a second time if you buy an overseas-listed holding directly. Hargreaves Lansdown's overseas dealing tariff applies a tiered charge: "on a £15,000 deal, the charge will be 0.99% of the first £10,000 and 0.50% of the next £5,000." A £10,000 US share purchase therefore costs £99 in currency conversion before commission. Income is converted too, at "the prevailing interbank exchange rate, to which we add an additional spread of 1% as our charge."
That's why the same global exposure can cost very different amounts depending on whether it arrives as a sterling fund, a sterling-listed ETF, or a basket of foreign shares.
Tax is the layer that depends on where the fund sits
Inside an ISA this layer is zero, which is most of the reason the wrapper exists. Outside one, it can be the second-largest line in the stack.
The global tracker's quoted historic yield was 1.17% at 30 April 2026. For 6 April 2026 to 5 April 2027, dividends above the £500 allowance are taxed at 10.75% for basic-rate taxpayers, 35.75% at the higher rate and 39.35% at the additional rate. Apply the higher rate to that yield and you get 0.42% of the holding a year — nearly twice the fund's 0.23% ongoing charge. At the basic rate it's 0.13%. The full rate ladder, and where the jumps sit, is set out in our piece on UK dividend and savings tax rates.
There's a further tax layer inside the fund: withholding tax deducted at source on foreign dividends, which no UK investor can reclaim. It doesn't appear in the OCF or the transaction cost line either. It shows up in the fund's return, which is why the gap between a fund and its index is a better measure of what a tracker costs than its fee is — the mechanics are in our guide to tracking difference and tracking error.
The whole stack, on one £50,000 portfolio, in one chart
The chart above plots the layers for the worked example. The 0.20% weighted ongoing charge is the shortest bar. Fund dealing costs add 0.10%, the platform adds 0.35%, and the total inside an ISA is 0.65%. The final bar is the dividend tax a higher-rate taxpayer would pay on the same holding outside a wrapper, 0.42%, which on its own is more than double the headline.
ESMA's November 2025 report gives the same shape at European scale: "actual retail UCITS costs range between 0.5% of the invested amount for passive bond UCITS and 2% for active equity UCITS." A UK household buying a global tracker on a percentage-fee platform lands between those bounds, closer to the cheap end, and still at three times what the fund's own page advertises.
Over 30 years the gap is 11.93 points of the final pot
Compounding a cost is more brutal than compounding a return, and the arithmetic doesn't need a return forecast. A constant annual drag of c leaves you with (1-c) to the power of the number of years, whatever markets do.
Run it for 30 years. A 0.20% drag surrenders 5.94% of the terminal value. A 0.65% drag surrenders 17.87%. The gap is 11.93 percentage points of whatever you'd otherwise have ended with. That's the price of measuring your costs by the headline rather than the stack, and it holds in a bull market and a bear one. The mechanics of fee compounding, and why the money lost far exceeds the money charged, are worked through in our piece on fund fees compounded over 30 years.
Two Vanguard documents, the same date, different dealing costs
Here's the awkward part. Vanguard publishes two UK cost documents, both dated 28 July 2026, both stating that the transaction cost data is as at 31 December 2025. They disagree.
For the FTSE 100 Index Unit Trust, ISIN GB00BD3RZ368, the intermediary disclosure shows 0.09% of transaction costs. The retail self-managed document shows 0.00% for the same share class on the same date. Neither is obviously wrong from the outside, and we could not establish which figure feeds the total a retail client sees.
That is not a Vanguard-specific complaint — Vanguard publishes more of this data than most, which is why the discrepancy is visible at all. It's a warning about precision. These figures are estimates produced by a prescribed methodology, and the methodology can produce results that don't behave like costs. In the same document, the Japan Stock Index Fund's disclosed transaction costs are -0.01%. A negative cost is a modelling artefact, not a rebate.
The strongest objection: some of this is double-counted
The best argument against stacking costs this way comes from the FCA, against itself. Its 2017 final report conceded an error in its own illustration: "by using a gross return for the funds, transaction costs should already be captured within this. Therefore we accept that by deducting transaction costs in addition to the OCF, we double counted transaction costs for active and passive funds."
The point generalises. If you're looking at a fund's published performance, that performance is already net of the OCF and net of its dealing costs. Subtracting them again gets you the wrong answer. The stack in this piece is a bill, not a return adjustment — useful for comparing what two routes to the same exposure cost, and misleading if you subtract it from a net return that already includes it.
There's a second objection, and Vanguard makes it on its own factsheet. Under swing pricing, "the NAV of a Fund may swing according to subscription/redemption activity so that transaction costs caused by these cashflows are not borne by the existing holders in a Fund." Part of a fund's disclosed dealing bill is caused by other people arriving and leaving, and the pricing mechanism is designed so that they pay it rather than you. How much of the 0.26% a long-term holder truly bears is not something the disclosure separates out.
What this stack cannot tell you
It's one provider's funds and one platform's tariff. The fund layers here sit below the 0.5% to 2% range ESMA reports for actual retail UCITS costs, and the platform layer is a percentage tariff rather than a flat monthly fee. A different pair moves the total in both directions at once.
The transaction cost figures are backward-looking estimates as at 31 December 2025, not a forecast and not a guarantee about the year ahead. A fund that reconstitutes its index heavily in one year can look expensive and cheap in consecutive years. The negative figure noted above is a reminder that the measure has error bars nobody publishes.
Spreads are missing from the official statistics entirely, on ESMA's own admission, so any European aggregate you read understates the total. And this is UK arithmetic: the stamp duty layer, the ISA wrapper and the dividend rates are all local, and none of it transfers to a US or European investor unchanged.
What would change the conclusion
If the platform layer went to zero, the stack in this example falls from 0.65% to 0.30%, and the headline figure would be roughly two thirds of the truth rather than one third. Percentage-fee platforms with hard caps, and flat-fee ones, already do much of that at larger balances. That's the layer a household changes with a transfer form rather than a different fund.
If the fund traded less, the middle layer shrinks with it. The global tracker's 13% turnover produced 0.06%; the FTSE 250 ETF's index rules produced 0.26%. Two funds, one provider, one methodology, over four times the dealing bill.
If the disclosure convention changed, the number moves without anything real changing. The two Vanguard documents already differ by 0.09 percentage points on one fund. A methodology that can print a negative cost is not measuring the thing precisely enough to argue over the third decimal place.
The thing worth watching isn't the fee on the fund page. It's the sum of what leaves the portfolio in a year, which is a number you can compute from four published documents and a calculator, or watch continuously in a tool like LedgerTouch. Either way, the useful comparison is total against total. Comparing two ongoing charges figures compares the two smallest numbers on the bill.