Three of the most popular UCITS ETFs tracking the S&P 500 — Vanguard's VUSA and VUAG, and iShares' CSP1 — all charge the same 0.07% annual fee and hold the same roughly 500 US large-cap stocks. The difference comes down to what they do with dividends, and for UK investors, which currency they're exposed to.
Two ways to handle dividends
VUSA is Vanguard's distributing share class. It collects dividends from the S&P 500 companies it owns and pays them out quarterly as cash. VUAG is the accumulating version from the same provider — it retains dividend income inside the fund and reinvests it automatically.
CSP1, the London Stock Exchange GBP trading line for the iShares Core S&P 500 UCITS ETF, is also accumulating. Like VUAG, it rolls dividends back into the portfolio rather than sending cash to investors.
That single structural difference — cash in your account versus automatic reinvestment — is the main reason the three funds behave differently for UK investors, despite tracking the same index.
The currency exposure question
CSP1 trades in pounds on the LSE, but its underlying share class is denominated in US dollars. It is not a sterling-hedged product. UK investors buying CSP1 take on currency risk: movements between the pound and the dollar will affect returns when measured in sterling.
VUSA and VUAG are also exposed to dollar-denominated assets, so all three carry some element of currency risk. But CSP1's structure means its sterling price reflects both the S&P 500's performance and the GBP/USD exchange rate — a point worth understanding before assuming the LSE trading line removes that exposure.
Same index, slightly different returns
Even though all three funds physically replicate the S&P 500 — holding the actual stocks rather than using derivatives — their returns can differ modestly. Fund operations, share-class structures, and the prices at which they trade on exchanges all play a role.
Provider choice matters too, though not for index exposure. Vanguard and iShares are separate fund managers. Their ETFs are Ireland-domiciled and UCITS-compliant, but the dealing lines, share prices, bid-offer spreads, and platform availability can vary. For investors, that can mean different dealing costs or accessibility depending on which broker they use.
What it doesn't change is the underlying exposure: all three track approximately 500 US large-cap stocks.
Don't mistake distributions for extra return
VUSA's quarterly payouts are not a bonus on top of the fund's performance. They are payments of income the fund has received from its holdings. When comparing VUSA with VUAG or CSP1, total return — including reinvested dividends — is the figure that matters.
An accumulating fund like VUAG or CSP1 will show a higher share price over time precisely because it keeps and reinvests income. A distributing fund like VUSA will show a lower share price but pay out cash along the way. Neither is inherently better; they just suit different investor needs.
What investors should check before choosing
All three funds charge 0.07% annually — VUSA and VUAG as an ongoing charges figure, CSP1 as a total expense ratio. On cost, there's nothing to separate them.
The decision comes down to three practical points: whether you want income paid out or reinvested, which provider's platform and dealing line work best for your account, and whether you're comfortable with the currency exposure embedded in a USD-denominated portfolio. CSP1's sterling trading line doesn't remove that exposure — it just changes the currency you deal in.
Investors comparing the three should look at total return figures over the same period, check the bid-offer spread on their chosen exchange, and confirm the accumulating or distributing status matches their own cash-flow needs. The fees are identical. The dividends and the dealing experience are not.
