Best S&P 500 ETFs: Guide for Irish Investors (2025)

There’s a reason the S&P 500 is the first index most new investors turn to — it tracks 500 of the largest US companies, and over time it’s delivered returns that are hard to ignore. For anyone in Ireland, the real question isn’t *whether* to invest, but *how* to do it without handing over a chunk of your gains to the taxman. This guide breaks down the best S&P 500 ETF options, the tax rules that matter, and the practical steps to get started.

Total S&P 500 ETFs available globally: Over 100 ·
Average expense ratio for top S&P 500 ETFs: 0.03% to 0.07% ·
Largest S&P 500 ETF by assets: SPDR S&P 500 ETF (SPY) – ~$500 billion ·
S&P 500 average annual return (last 20 years): ~9.5% ·
Number of S&P 500 ETFs domiciled in Ireland: Over 20 ·
Warren Buffett’s recommended S&P 500 ETF: Vanguard S&P 500 ETF (VOO) or similar low-cost index fund

The table below gives the core specifications for S&P 500 ETFs that every investor should know before choosing a fund.

Which S&P 500 ETF is the best?

Key factors: expense ratio, tracking error, fund size

When comparing S&P 500 ETFs, three metrics matter most. The expense ratio is the annual fee you pay — VOO and IVV both charge just 0.03%, making them the cheapest options (justETF — independent product data). Tracking error measures how closely the fund mirrors the index; the largest funds tend to have the smallest error. Fund size signals liquidity — SPY, with roughly $500 billion in assets, is the most liquid S&P 500 ETF globally.

The implication: chasing the absolute lowest fee is sensible for long-term holds, but for active traders, liquidity matters more.

Top contenders: VOO, IVV, SPY, CSPX

• VOO (Vanguard S&P 500 ETF) – 0.03% expense ratio, US-domiciled
• IVV (iShares Core S&P 500 ETF) – 0.03% expense ratio, US-domiciled
• SPY (SPDR S&P 500 ETF) – 0.09% expense ratio, US-domiciled, highest liquidity
• CSPX (iShares Core S&P 500 UCITS ETF) – ~0.07% expense ratio, Ireland-domiciled, accumulating

For Irish investors, the choice between US-domiciled (VOO, IVV, SPY) and UCITS (CSPX) depends on tax treatment — not just fees. CSPX, launched on 19 May 2010 and domiciled in Ireland (justETF — product profile summary), avoids US estate tax for non-US investors, a risk that applies to US-domiciled funds.

The trade-off: US-domiciled funds have lower fees but expose you to US estate tax; UCITS funds cost slightly more but sidestep that risk entirely.

Comparison table of leading S&P 500 ETFs

Four major ETFs, one clear pattern: the fee gap between US and UCITS funds is narrowing, but the tax gap remains wide.

What this means: for most Irish investors, CSPX’s slightly higher fee is more than offset by the estate-tax protection and lower US dividend withholding — the effective cost advantage flips in its favour once you factor in tax.

Can I invest in the S&P 500 from Ireland?

Availability through Irish brokers

Irish investors can buy both US-domiciled and UCITS ETFs through major brokers like DEGIRO and Interactive Brokers (justETF — broker availability data). US-domiciled ETFs are available to Irish residents, but EU regulations (PRIIPs and MiFID II) restrict brokers from offering them to retail investors without a Key Information Document (KID). In practice, many Irish brokers still facilitate access — but the legal grey area means UCITS ETFs are the simpler, commonly recommended route.

The catch: if you use a US-domiciled ETF, you’ll face a 30% US dividend withholding tax unless a tax treaty reduces it — and the US–Ireland treaty doesn’t apply directly to individual Irish investors holding US ETFs. The fund-level rate is 15% for Irish-domiciled funds (State Street Global Advisors — ETF provider analysis), but individuals don’t get that benefit on US ETFs.

US-domiciled vs Ireland-domiciled ETFs — the tax divide

For non-Irish investors, Ireland-domiciled ETFs are tax-transparent at the Irish level — the country does not levy Irish withholding tax on dividends or fund distributions paid to non-residents (Bogleheads Wiki — independent investor education). The fund itself is exempt from Irish tax on income and gains (Bogleheads Wiki — tax structure reference). Ireland also imposes no capital gains tax, inheritance tax, or estate tax on non-Irish residents who hold Ireland-domiciled ETFs (Bogleheads Wiki — non-resident tax summary).

Why this matters: for a French or German investor, an Irish-domiciled S&P 500 UCITS ETF means 15% US dividend withholding (vs 30% on a US ETF), no Irish tax at fund level, and no US estate tax exposure.

Currency considerations: USD vs EUR

Most S&P 500 ETFs trade in USD. CSPX, for example, trades in USD on major European exchanges (justETF — product profile data). Some platforms offer EUR-hedged share classes, but those come with hedging costs that eat into returns. For long-term investors, unhedged USD exposure is the norm — the dollar tends to strengthen in US-market rallies.

How to avoid ETF tax in Ireland?

Understanding Irish deemed disposal rules

For Irish-resident investors, the tax treatment of ETFs is punitive. Most ETFs are taxed at 41% on gains as income, not capital gains (Nathan Trust — Irish tax advisory firm). The deemed disposal rule forces you to pay that 41% tax on unrealised gains every eight years — even if you haven’t sold a single unit (Nathan Trust — deemed disposal explanation).

Choosing accumulating vs distributing ETFs

Accumulating funds (like CSPX) automatically reinvest dividends, deferring taxation until you sell. Distributing funds pay dividends to you as cash, which are taxed in the year received. For Irish investors, accumulating funds are generally more tax-efficient because they delay the deemed disposal calculation until sale, and reinvested dividends compound without the drag of annual tax payments. Notably, justETF — independent ETF education platform notes that in the UK the choice doesn’t change the rate of income tax owed but affects timing and reinvestment convenience — in Ireland, the timing advantage of accumulating funds is more pronounced.

The trade-off: accumulating funds mean you never see the dividend cash, but you keep more working in the market.

Tax treatment of US-domiciled ETFs

Irish residents who hold US-domiciled ETFs face a 30% US dividend withholding tax (the US statutory rate on non-treaty foreigners) at source (HANetf — ETF issuer commentary). The Irish Revenue then taxes the net dividend at the 41% exit tax rate. Deemed disposal still applies. The net result: US-domiciled ETFs are rarely optimal for Irish residents due to the double layer of tax.

Is the S&P 500 ETF a good buy for beginners?

Benefits for new investors

• Instant diversification across 500 US companies — one ETF covers Apple, Microsoft, Amazon, and 497 others
• Low costs — the best options cost just 0.03% per year (justETF — fee comparison data)
• Simple to buy and hold — no stock-picking required

Warren Buffett famously recommended low-cost S&P 500 index funds for most investors, calling them the best bet for the average person. For a beginner, an S&P 500 ETF is the single most effective way to get US market exposure without becoming a professional stock analyst.

Historical average return and what it means

The S&P 500 has delivered an average annual return of about 9.5% over the last 20 years (including dividends). A $10,000 investment made 20 years ago would be worth roughly $57,000 today with dividends reinvested — a powerful demonstration of long-term compounding. Note that past performance doesn’t guarantee future results, and the index has experienced significant drawdowns (2008, 2020, 2022) along the way.

Risks: market volatility and currency risk

The biggest risk for non-US investors is currency: if the euro strengthens against the dollar, your USD-denominated ETF loses value in EUR terms. Over multi-decade horizons, this tends to even out, but it adds a layer of volatility that pure US investors don’t face.

What if I invested $10,000 in S&P 500 5 years ago?

Hypothetical returns with dividends reinvested

Let’s run the numbers. A $10,000 lump sum invested in the S&P 500 five years ago (say mid-2020) would be worth approximately $18,000 today, assuming dividends were reinvested. That’s an 80% total return, translating to roughly a 12.5% annualised gain — well above the long-term average, driven partly by the post-pandemic tech rally.

The pattern: entry point matters. If you’d invested at the peak of the market in late 2021, your return would be lower. But for investors who held through the 2022 bear market, patience paid off.

Comparison with other investments

Over the same five-year period, a €10,000 investment in Eurozone government bonds would have returned roughly negative in real terms after inflation. Cash savings accounts offered less than 1% annually. Even global diversified portfolios lagged the S&P 500, which outperformed most asset classes during this stretch due to US tech dominance.

What this means: the S&P 500 has delivered exceptional returns relative to alternatives, but that concentration in US large-cap growth also represents a sector bet — not pure index diversification.

Timeline of S&P 500 ETFs

The timeline signal: the shift from US-only to Ireland-domiciled UCITS ETFs reflects a structural change in how European investors access US markets — tax treaties and regulatory alignment made Dublin the natural hub.

What’s confirmed and what’s unclear

Confirmed facts

• S&P 500 is a market-cap-weighted index of 500 US large-cap stocks
• VOO, IVV, and SPY are the largest ETFs tracking it (justETF — ETF comparison data)
• Irish investors face 41% exit tax on ETFs (Nathan Trust — Irish tax advisory guide)
• UCITS ETFs avoid US estate tax for non-US investors (Bogleheads Wiki — investor education resource)

What’s unclear

• Future performance of the S&P 500 relative to other indices
• Direction of EUR/USD exchange rates
• Potential changes to Irish ETF tax legislation

Expert perspectives

“A low-cost S&P 500 index fund is the most sensible investment for the vast majority of people.”

— Warren Buffett, CEO of Berkshire Hathaway (justETF — investor education reference)

“For most non-Irish investors, distributions from Ireland-domiciled UCITS ETFs are free from Irish withholding tax.”

— State Street Global Advisors — asset manager analysis

“Irish ETFs can take advantage of the US–Ireland double-tax treaty so that dividends from US equities are taxed at 15% withholding rather than 30%.”

— Arthur Cox — Irish law firm, ETF establishment guide

Your next move

The choice between an S&P 500 ETF isn’t just about picking the cheapest fee — it’s about picking the right wrapper for your tax residence. For Irish residents, the 41% exit tax and 8-year deemed disposal make accumulating UCITS ETFs like CSPX the most practical option. For non-Irish European investors, the same fund offers a tax-efficient, estate-tax-free way to own US equities. For US-domiciled investors, VOO or IVV at 0.03% is the clear winner.

1. Determine your tax residence — Irish resident or non-Irish European investor
2. Choose between accumulating (CSPX) and distributing share classes based on your tax situation
3. Open a brokerage account that offers UCITS ETFs (DEGIRO, Interactive Brokers)
4. Place your order — buy CSPX or your chosen UCITS S&P 500 ETF
5. Set up automatic reinvestment or manual periodic buys to dollar-cost average
6. Track your holdings and prepare for deemed disposal calculations if you are Irish-resident
7. Consult a tax adviser for personalised planning specific to your country of residence

What this means: match your domicile to your fund wrapper — and let the tax treaty do the heavy lifting.

For a detailed look at one of the most popular options, check out this Vanguard S&P 500 ETF review that breaks down returns and risks.

Frequently asked questions