CSPX, without the jargon.

One fund. A basket of US companies.

CSPX is the London-listed, US-dollar trading line of the iShares Core S&P 500 UCITS ETF. It aims to track the S&P 500, an index of large US companies. You buy units of the fund through a broker, much as you would buy a share.

It is accumulating: dividends received by the fund, after applicable costs and taxes, are reinvested inside it. You do not normally receive a cash dividend from this share class.

Fund details: official iShares CSPX page. Confirm the current factsheet and listing before buying; a ticker alone is not enough.

Why the Irish domicile matters

Domicile is the fund’s legal home. It is different from the stock exchange where you buy it or the countries where its investments operate.

US dividend withholding

US dividends received by an Irish-domiciled ETF generally face 15% US withholding at fund level under the US-Ireland treaty. Direct US dividends paid to a Singapore-resident individual who is not a US person generally face the standard 30% rate, unless another exemption or treaty entitlement applies.

This concerns dividends, not a tax on your entire investment return. Accumulation does not make the withholding disappear. The fund reinvests what remains.

US estate-tax treatment

For investors who are neither US citizens nor US-domiciled for estate-tax purposes, shares in an Irish fund are generally not US-situs assets. These ETF holdings therefore generally avoid the US estate-tax exposure associated with directly held US corporate shares.

Your citizenship, domicile and tax residence matter. Other taxes or reporting obligations may still apply, especially for US persons. This is general information, not individual tax advice.

Sources: iShares tax FAQ, IRS nonresident withholding rules and IRS guidance on US-situs estate assets. The Irish-fund estate treatment follows from the fund’s Irish incorporation and the general situs rules.

How to buy CSPX

Broker screens differ. These are the checks that matter, whichever broker you use. There are no affiliate links here.

1. Choose a broker with London access

   Check its regulatory status, whether the CSPX listing is available to you, and its custody and withdrawal terms. Compare the costs below before opening an account.

2. Fund the account and check currency costs

   The London CSPX listing trades in USD. Check how your broker converts your deposit currency, including any automatic conversion and minimum charge.

3. Find the exact fund

   Search for CSPX or ISIN IE00B5BMR087. Verify the full name, accumulating share class, London listing and USD trading currency. Select the ETF itself, not a CFD or another leveraged product.

4. Review the order

   Decide the number of units using the current price and your available cash. A limit order sets the most you will pay per unit, but may not fill. Check market hours, the bid-ask spread and order expiry.

5. Check the total before confirming

   If you go ahead, read the order preview for commission, currency conversion and total cost. After execution, check the trade confirmation and holdings. Keep your records and review your plan periodically.

The fund fee is not the whole cost.

CSPX’s stated total expense ratio is 0.07% a year. That is roughly US$7 a year per US$10,000 at a constant holding value, calculated as 10,000 × 0.0007. It is reflected in the fund’s value rather than sent as a separate bill.

Broker charges depend on your account and country. Read the current fee schedule instead of assuming a “free trade” means no cost.

Is CSPX enough on its own?

CSPX gives you broad exposure within large US shares. It does not cover the whole world, smaller companies comprehensively, bonds or the cash you may need soon.

Whether it is enough depends on what the rest of your money needs to do. Money for near-term spending has a different job from long-term retirement savings. An all-share portfolio can fall substantially, even when it holds hundreds of companies.

Before adding more funds, identify what is missing. Global shares can broaden country exposure. Bonds or cash can serve different risk and spending needs. Adding another US growth-heavy fund does not do those jobs.

The 70/30 option: more Nasdaq, more risk.

Here, 70/30 means 70% Nasdaq 100 and 30% S&P 500, rebalanced yearly. Funds that copy these two indexes include CNDX and CSPX. It is not 70% shares and 30% bonds.

CNDX is the Irish-domiciled, accumulating iShares Nasdaq 100 UCITS ETF (ISIN IE00B53SZB19). Its stated annual fund charge is 0.30%. It concentrates exposure in large Nasdaq-listed non-financial companies and overlaps substantially with CSPX. It is a tilt towards those companies, not a separate defensive asset.

Across 201 rolling 10-year windows, the mix beat the S&P 500 in 185. Median annualised returns were 13.7% for the mix and 9.9% for the S&P 500. But the worst 10-year annualised returns were -5.7% and -1.9%, respectively. These overlapping windows are not independent trials or a forecast.

Source: our research snapshot, 9 Oct 2026. This is an index backtest, not realised CSPX/CNDX fund performance since 2000. Treatment of fees, tax and index dividends needs documentation. See the limitations. Fund details: official iShares CNDX page.