What Is CSPX? UCITS S&P 500 ETF Guide for Singapore [2026]

The S&P 500 has been one of the strongest-performing major equity markets in recent years, powered by the top 500 US companies across technology, communication services, financials, healthcare, and consumer sectors. But for investors who want exposure to that market, the ETF they choose matters almost as much as the index itself.

At the surface, US-domiciled ETFs such as VOO, IVV and SPY, and Ireland-domiciled UCITS ETFs such as CSPX may look similar. They all give exposure to the S&P 500. The difference is in the structure: dividend withholding tax, estate tax exposure, distribution policy, trading venue, currency, and access through different platforms.

CSPX is the iShares Core S&P 500 UCITS ETF USD (Acc), managed by BlackRock and listed on the London Stock Exchange (LSE). It tracks the S&P 500, uses full physical replication, has a 0.07% total expense ratio, and reinvests dividends automatically through its accumulating structure. 

That is why CSPX is often used as a UCITS alternative to US-listed S&P 500 ETFs. The goal is not to get different market exposure. The goal is to access the same S&P 500 exposure through a structure that may be more tax efficient for long-term investors outside the US.

This guide covers what CSPX is, how it works, how its Ireland-domiciled structure affects withholding tax and estate tax considerations, how it compares with VUAA, SPYL, VOO and IVV, and what to consider before using it in a long-term portfolio.

TLDR; here is a summary of CSPX at a glance:

* as of June 2026

What is CSPX?

CSPX is the ticker for the iShares Core S&P 500 UCITS ETF USD (Acc), an Ireland-domiciled fund managed by BlackRock that tracks the S&P 500 index. 

The S&P 500 represents approximately 500 of the largest US companies by market capitalisation, spanning sectors from technology and financials to healthcare and consumer discretionary. 

The fund was launched in May 2010 and uses full physical replication, meaning it holds the actual shares of index constituents rather than derivatives or swaps.

Dividends collected from underlying holdings are reinvested back into the fund automatically, so investors benefit from compounding without managing individual dividend payments. This is what "Acc" (accumulating) means in the fund's full name.

What the UCITS structure means for you

UCITS stands for Undertakings for Collective Investment in Transferable Securities. It is a European fund framework used by many ETFs that are distributed to investors outside the US.

For CSPX, the more practical point is not the acronym itself. It is the fund’s Ireland domicile.

Because CSPX is domiciled in Ireland, it can generally benefit from the US-Ireland tax treaty on dividends received from US companies. Under the treaty, dividends are generally subject to a 15% withholding tax rate in most cases, compared with the 30% US withholding tax rate that commonly applies to US-source dividends paid to nonresident investors where no lower treaty rate applies. 

The IRS states that US-source dividends paid to nonresident aliens are generally withheld at 30% or a lower treaty rate, while the US-Ireland treaty provides a 15% rate for dividends in most cases.

This is the key structural difference between CSPX and a US-domiciled S&P 500 ETF such as VOO, IVV or SPY. The market exposure may look similar, but the tax treatment is not the same.

The withholding tax does not usually appear as a separate line item in an investor’s brokerage account. It is deducted at the fund level before returns flow through to the ETF’s net asset value. In practice, this shows up in the fund’s tracking difference and overall return, not as a separate tax bill.

For long-term investors, that difference matters because dividend tax drag compounds over time. CSPX does not remove US dividend withholding tax entirely, but the Ireland-domiciled structure can reduce it compared with holding a US-domiciled ETF directly.

CSPX at a glance

Why the S&P 500 remains a long-term investing option

The S&P 500 has gone through recessions, rate hikes, inflation shocks, tech cycles, and financial crises. But over time, it has remained one of the clearest ways to participate in the growth of large US companies.

From 2000 to 2025, the index posted positive returns in 18 out of 26 calendar years, with an average annual return of 7.68%. That period included sharp sell-offs, from the dot-com crash to the Global Financial Crisis, the COVID-19 market shock, and the 2022 rate-hike cycle. Yet the long-term pattern has been clear: markets can fall sharply in the short term, but staying invested has historically mattered more than trying to avoid every downturn.

That is the role the S&P 500 plays in many portfolios. It is not a guaranteed return, and it is not diversified across every market. But it gives investors exposure to many of the world’s largest listed businesses across technology, healthcare, financials, consumer brands, industrials, and more.

CSPX holdings and sector exposure

CSPX's market-cap weighting means the largest US companies drive a significant share of its return. The fund holds 503 stocks, but the concentration at the top is meaningful for anyone thinking about portfolio construction.

Top 10 holdings

The top 10 holdings as of May 2026 account for 36.81% of the fund, led by Nvidia, Apple, and Microsoft.

Source: slickcharts.com/sp500 (May 2026)

Sector breakdown

Technology dominates CSPX, reflecting the composition of the S&P 500 itself. The practical implication: a sustained rotation away from mega-cap tech would affect CSPX more than a more equally-weighted fund.

Source: JustETF (Mar 2026)

CSPX fees: what you actually pay

CSPX's total expense ratio of 0.07% p.a. means S$70 per year on a S$100,000 position. This fee is deducted continuously from fund assets and is already reflected in the ETF's published price and performance figures. You do not receive a separate fee invoice.

Total cost of ownership

The TER is only one piece of the actual cost. For investors converting SGD to buy an LSE-listed ETF, the FX spread often costs more in dollar terms than the TER itself.

The FX spread is the silent cost that most investors overlook. Converting S$10,000 to USD at a typical retail spread of 0.5% costs S$50, which already exceeds a full year of TER on that same amount.

CSPX vs VOO, IVV and SPY

CSPX, VOO, IVV and SPY all track the S&P 500. The key difference is domicile.

CSPX is domiciled in Ireland and structured as a UCITS ETF. VOO, IVV and SPY are domiciled in the US.

On expense ratio alone, VOO and IVV look cheaper than CSPX. Both charge 0.03% p.a., compared with CSPX’s 0.07% p.a.

But for long-term investors outside the US, TER is only one part of the cost. Dividend withholding tax and estate tax treatment can matter more than the small fee difference.

Dividend withholding tax

The S&P 500’s dividend yield is usually modest, but dividend tax drag still compounds over time.

For US-domiciled ETFs such as VOO, IVV and SPY, dividends are paid from a US fund. For many non-US investors, US-source dividends are generally subject to 30% withholding tax unless a lower treaty rate applies.

CSPX works differently. Because the fund is domiciled in Ireland, US dividends received by the fund are generally subject to 15% withholding tax under the US-Ireland tax treaty. This tax is applied at the fund level before returns flow through to investors.

A simplified example:

This is why a lower TER does not automatically mean a lower total cost.

On a USD 100,000 holding, the fee difference between VOO at 0.03% and CSPX at 0.07% is about USD 40 a year. But if the S&P 500 dividend yield is 1.5%, the difference between 30% and 15% dividend withholding tax is about USD 225 a year.

In that example, the withholding tax saving is larger than the additional fund fee.

This does not mean CSPX will always outperform VOO, IVV or SPY. Actual returns also depend on tracking difference, FX conversion, bid-ask spread, brokerage fees, securities lending, and each investor’s tax position. But it shows why fund domicile matters when comparing S&P 500 ETFs.

US estate tax

US-domiciled ETFs such as VOO, IVV and SPY are generally considered US-situs assets. For nonresident noncitizens, US-situated assets above USD 60,000 can create US estate tax filing requirements.

Ireland-domiciled UCITS ETFs such as CSPX are commonly used by investors who want S&P 500 exposure without holding a US-domiciled ETF directly.

This does not mean every investor will face US estate tax. The rules depend on citizenship, residency, total US-situs assets, applicable treaties, and personal circumstances. But for larger portfolios, it is one of the main reasons investors compare Ireland-domiciled UCITS ETFs against US-listed ETFs.

CSPX vs VUAA and SPYL: comparing UCITS S&P 500 ETFs

Once you decide to use an Ireland-domiciled UCITS ETF, the comparison becomes more practical.

CSPX, VUAA and SPYL all track the S&P 500. All three are Ireland-domiciled, accumulating UCITS ETFs. All three use physical replication.

The differences are mainly provider, TER, fund size, track record, liquidity, trading line, and platform availability.

SPYL has the lowest TER of the three at 0.03%, which puts it closer to VOO and IVV on headline fund cost while retaining the Ireland-domiciled UCITS structure.

But TER is not the only deciding factor. A newer fund may have a shorter track record, different trading liquidity, and wider spreads depending on the exchange and order size. For small monthly contributions, a four-basis-point TER difference may be less important than brokerage commission, FX spread, and bid-ask spread.

CSPX’s main advantage is scale and track record. It is one of the most established UCITS S&P 500 ETFs, with a long operating history, large asset base, and broad availability across global brokerage platforms. That can matter for investors placing larger orders or those who prefer the most widely used fund in the category.

VUAA sits in between. It has the same 0.07% TER as CSPX, the same Ireland-domiciled accumulating UCITS structure, and the Vanguard brand. The choice between CSPX and VUAA often comes down to platform access, trading currency, spreads, and personal provider preference.

How to decide between them

For most investors, the decision can be narrowed down like this:

The cleanest way to think about it is this: VOO, IVV and SPY are most relevant if you specifically want US-listed ETFs. CSPX, VUAA and SPYL are more relevant if you want S&P 500 exposure through an Ireland-domiciled UCITS structure.

CSPX is not the cheapest option by TER. It is also not the only good UCITS S&P 500 ETF. Its appeal is that it combines low cost, accumulating dividends, Ireland domicile, long track record, scale, and broad platform availability in one fund.

How to buy CSPX in Singapore

How to buy CSPX

CSPX is listed on the London Stock Exchange, so buying it is slightly different from buying a Singapore-listed ETF on SGX or a US-listed ETF on NYSE.

Most Ireland-domiciled UCITS ETFs trade on European exchanges such as the London Stock Exchange, Xetra, Euronext, Borsa Italiana and SIX. The key is to use a platform that gives you access to the right exchange, currency line and ticker.

Step 1: Choose a platform with access to LSE-listed ETFs

Not every brokerage offers the same market access. Some platforms are built mainly for SGX and US-listed securities, while others provide broader access to UK and European exchanges.

When comparing platforms, look beyond headline commission. The total cost also depends on FX spread, minimum commission, custody fee, platform fee, bid-ask spread, and whether the platform supports recurring investments or fractional units.

Sources: DBS Vickers, OCBC Securities, Interactive Brokers, Saxo, FSMOne, StashAway, Syfe, Tiger Brokers and Moomoo fee schedules, as of May 2026. Fees may exclude GST, exchange fees, clearing fees, custody fees, FX spread and platform charges. Check the latest fee schedule before trading.

Step 2: Convert your cash into the ETF’s trading currency

CSPX’s main London Stock Exchange ticker trades in USD.

That means investors funding their accounts in SGD usually need to convert SGD to USD before buying. Most platforms allow in-app currency conversion, but FX spreads can vary meaningfully.

This matters most for recurring investors. If you invest monthly, a platform with low FX spreads and simple recurring execution may be more important than saving a few basis points on ETF expense ratio.

Step 3: Search for the correct ticker

CSPX appears under different tickers depending on the exchange and trading currency. The safest way to confirm you are looking at the right ETF is to check the ISIN: IE00B5BMR087.

Source: justETF.

Step 4: Decide how much to invest

Before placing the order, decide whether CSPX is meant to be a core holding or just part of your US equity allocation.

CSPX gives exposure to large-cap US equities. It does not give you bonds, emerging markets, non-US developed markets, Singapore equities, REITs or cash-like assets. That may be acceptable for investors with a high risk tolerance, but it should be deliberate.

For example, some investors may use CSPX as their US equity sleeve, then combine it with global equity ETFs, bond ETFs, T-bills, cash management products or other asset classes for broader diversification.

Step 5: Use a limit order where possible

A limit order lets you set the maximum price you are willing to pay.

For a liquid ETF such as CSPX, small trades may still execute smoothly. But a limit order is useful when spreads are wider, markets have just opened, or the order size is large.

As a simple rule, consider using limit orders when:

Step 6: Review your portfolio after buying

Buying CSPX is only the first step. The more important part is making sure it continues to fit your portfolio.

A 100% CSPX portfolio is effectively a concentrated allocation to US large-cap equities. That can perform well when US stocks are doing well, but it also means your portfolio is more exposed to US market cycles, USD currency movements, and mega-cap concentration.

A more balanced approach may involve using CSPX alongside other assets. The right mix depends on your time horizon, risk tolerance, income needs, and whether you are investing for long-term growth, retirement, or a specific financial goal.

How to use CSPX in a portfolio

CSPX is best understood as a core equity holding. It gives broad exposure to large-cap US equities through one ETF, so investors typically use it in one of three ways.

Its accumulating structure also makes it practical for long-term investing. Dividends are reinvested automatically, so investors do not need to manage small cash payouts or reinvest them manually.

For dollar-cost averaging, the main issue is transaction cost. If your broker charges a minimum fee per trade, very small and frequent orders can be inefficient. Batching contributions into monthly or quarterly purchases can help reduce cost per dollar invested.

Rebalancing can also be simple. A common approach is to review the portfolio once or twice a year, or when allocations drift meaningfully from target. For example, if strong US market returns push CSPX to a larger share of your portfolio than intended, new contributions can be redirected to bonds, cash-like assets, or other regions.

CSPX can be a strong long-term building block, but it is not a complete portfolio on its own. A 100% CSPX portfolio is still concentrated in US large-cap equities, USD exposure, and the largest companies in the S&P 500.

Main risks to know before investing in CSPX

CSPX tracks the S&P 500, so its risks are largely the risks of US large-cap equities. The fund can compound over long periods, but it can also fall sharply during market downturns.

The biggest practical risk is not understanding what you own. CSPX is simple, but it is still an equity ETF. It works best for investors who can stay invested through market cycles, rather than those who need short-term stability or regular income.

Is CSPX eligible for SRS or CPF?

Direct purchases of CSPX on the London Stock Exchange are generally not processed through a CPF or SRS-approved operator, so they do not qualify for CPF or SRS in the standard way. 

SRS funds can be invested in selected products through SRS-approved operators designated by IRAS. The simplest approach for investors who want S&P 500 exposure through SRS is to use a platform that offers SRS-eligible access directly.

StashAway ETF Explorer is SRS-eligible. It allows you to direct SRS contributions into ETFs covering the S&P 500 and 80+ other asset classes at a flat USD 1 per transaction, with no percentage-based advisory fees. 

Frequently asked questions

What is CSPX?

CSPX is the ticker for the iShares Core S&P 500 UCITS ETF USD (Acc), an Ireland-domiciled ETF managed by BlackRock that tracks the S&P 500 index. 

It is listed on the London Stock Exchange and has a total expense ratio of 0.07% p.a. The fund was launched in 2010 and has EUR 118,117m in assets as of May 2026.

Does CSPX pay dividends?

No. CSPX is an accumulating ETF. Dividends collected from underlying holdings are reinvested into the fund. The NAV rises to reflect reinvested dividends, but no cash is paid to investors. 

Investors who prefer regular income should consider a distributing alternative such as IUSA (iShares Core S&P 500 UCITS ETF USD Distributing, ISIN IE0031442068).

Why is CSPX often preferred over VOO for Singapore investors?

VOO has a lower TER (0.03% vs 0.07%) but as a US-domiciled ETF it typically subjects non-US investors to 30% dividend withholding tax versus CSPX's 15% at the fund level. 

For investors with more than USD 60,000 in US-domiciled assets, the US estate tax consideration also favours CSPX. In total-return terms over a multi-decade horizon, the tax efficiency of the UCITS structure typically outweighs the TER difference for non-US investors.

What is the CSPX expense ratio?

CSPX has a total expense ratio of 0.07% p.a. This is deducted from fund assets continuously and is already reflected in the ETF's published price and performance.

What is the difference between CSPX and VUAA?

Both CSPX (iShares) and VUAA (Vanguard) are Ireland-domiciled, accumulating UCITS ETFs tracking the S&P 500 with identical TERs of 0.07% p.a. 

The main practical differences are fund size (CSPX at EUR 118bn vs VUAA at EUR 26bn), liquidity and bid-ask spreads, inception date (2010 vs 2019), and fund provider.

Can I buy CSPX with my SRS funds?

Not through a direct LSE brokerage purchase in the standard way. StashAway ETF Explorer is SRS-eligible and provides access to S&P 500 ETF exposure at a flat USD 1 per transaction. It is a practical alternative for investors who want S&P 500 exposure through their SRS account.