Finding the cheapest S&P 500 UCITS ETF in 2026 sounds like a one-line answer — SPYL, at roughly 0.03% a year — and if all you wanted was the headline, there it is. But I have spent eleven years buying Irish-domiciled index funds, and I can tell you the cheapest ticket price and the cheapest ownership experience are not always the same fund. TER is only one of four things that determine what an S&P 500 tracker actually costs you: the fee, the tracking difference, the replication method and the practicalities of buying it through your broker.
So this guide is a proper roundup, not a leaderboard. I line up every serious contender — SPYL and SPY5 from SPDR, CSPX and SXR8 from iShares, VUAA, VUAG and VUSA from Vanguard, and Invesco’s synthetic P500 and SPXP — and then explain when the 0.03% fund wins, when the 0.07% incumbent is worth the extra, and why the swap-based fund with the middling fee has quietly beaten both. All TERs below are illustrative at the time of writing; providers reprice, so confirm the live figures before you buy.
Cheapest S&P 500 UCITS ETF contenders at a glance
Nine tickers, but really only four fund families. Several of these are the same fund wearing different exchange listings, which the table flags.
How we compare: fund picks here follow our published how we compare ETFs — TER, tracking difference, liquidity and domicile, in that order.
| Fund | Tickers | TER (approx.) | Replication | Distribution | Standout trait |
|---|---|---|---|---|---|
| SPDR S&P 500 UCITS ETF (Acc) | SPYL | ~0.03% | Physical | Accumulating | The headline price leader |
| SPDR S&P 500 UCITS ETF (Dist) | SPY5 | ~0.03% | Physical | Distributing | The older SPDR line, same low fee |
| iShares Core S&P 500 UCITS ETF (Acc) | CSPX (LSE, USD), SXR8 (Xetra, EUR) | ~0.07% | Physical | Accumulating | Largest and most liquid, ~€130bn+ |
| Vanguard S&P 500 UCITS ETF (Acc) | VUAA (Xetra), VUAG (LSE, GBP) | ~0.07% | Physical | Accumulating | The Vanguard-brand core holding |
| Vanguard S&P 500 UCITS ETF (Dist) | VUSA | ~0.07% | Physical | Distributing | Quarterly cash dividends |
| Invesco S&P 500 UCITS ETF | SPXP (Acc), P500 (Dist) | ~0.05% | Synthetic (swap) | Acc and Dist lines | No US withholding tax on the swap |
TERs are illustrative and change — verify current figures on justETF or the issuer factsheets before buying. All funds above are Irish-domiciled UCITS vehicles tracking the same S&P 500 index.
Rates referenced here follow our country-by-country ETF tax table, checked against official sources.
Notice what the table already tells you: every fund here charges between three and seven basis points. On €10,000, the gap between the dearest and the cheapest is about €4 a year. That is not nothing, but it does mean the interesting questions live below the headline number.
The 0.03% headline: SPYL, SPY5 and what the number hides
SPYL is the fund that reset the market. When State Street launched it in late 2023 at roughly 0.03%, it undercut the incumbent iShares and Vanguard funds by more than half, and it has hoovered up new savings-plan money ever since. It is physically replicated, accumulating, Irish-domiciled and — for anyone hunting the cheapest S&P 500 UCITS ETF by sticker price — it is the answer. I cover the fund in depth in the SPYL factsheet.
A search query I see constantly is “SPY5 TER 0.03%”, usually from readers confused about which SPDR fund is which. The confusion is fair, so let me untangle it. SPY5 is the older SPDR S&P 500 UCITS ETF, launched back in 2012 as a distributing fund. SPYL is the newer accumulating fund from 2023. When SPDR set SPYL’s fee at ~0.03%, it cut the older SPY5 line to the same level — so yes, SPY5 at 0.03% is real, and you can verify both figures on justETF. The practical difference is not price but plumbing: SPY5 pays dividends out quarterly, SPYL reinvests them internally. Accumulators want SPYL; income-takers can have the identical fee with SPY5.
Now for what the headline hides. First, youth: SPYL’s track record is measured in a couple of years, against fifteen for CSPX. Short records make tracking quality harder to judge, though SPDR’s early numbers have been perfectly respectable. Second, scale: SPYL has grown fast but remains a fraction of the iShares giant, which can mean fractionally wider spreads on quiet days. Third — and this is the one people miss — a 0.04-point TER advantage can be entirely eaten, or reversed, by tracking difference. More on that shortly.
Physical vs synthetic: SPXP’s withholding edge
Every fund in the table except Invesco’s holds the actual 500 shares. Invesco’s S&P 500 UCITS ETF instead uses a swap: the fund holds a basket of collateral and a contract with investment banks that pay it the exact index return. SPXP is the accumulating line and P500 the distributing line of this synthetic structure, priced at roughly 0.05% — between SPYL and the incumbents.
Why would anyone accept a swap contract instead of real shares? Because of a quirk of US tax law that is worth understanding properly. A physical Irish fund receives US dividends with 15% withholding tax skimmed off — the US–Ireland treaty rate, already better than the default 30%, but still a real cost of roughly 0.2% a year at current yields. A swap written on the S&P 500 total return, however, is not a dividend payment, and under US rules (Section 871(m) exempts swaps on deep, liquid indices like the S&P 500) the swap counterparty can deliver the gross index return — no withholding at all.
That structural edge is why the Invesco fund has persistently beaten the physical funds on realised performance despite not having the lowest TER. The trade-off is counterparty risk: you depend on the swap banks honouring the contract. UCITS rules cap and collateralise that exposure, and Invesco spreads it across multiple counterparties, so I consider the risk modest — but it is not zero, and some investors reasonably refuse it on principle. I walk through the structure, the collateral and the numbers in the SPXP factsheet.
Tracking difference beats TER
Here is the mental shift that separates careful ETF buyers from sticker-price shoppers. The TER is a forecast of cost; the tracking difference is the audited result. It measures how far the fund’s actual return landed from the index return over a year, after all fees, all withholding taxes, all securities-lending revenue and all replication luck.
And the results regularly upset the fee table. The big physical funds — CSPX and VUAA — have historically tracked tighter than their 0.07% TER suggests, because 15%-treaty withholding relief and lending revenue claw back several basis points. The synthetic Invesco fund has frequently posted a tracking difference near zero or better, thanks to the gross-dividend swap. SPYL is the cheapest on paper, yet its realised gap to the index is not automatically the smallest.
The honest conclusion: a fund charging 0.05% that lags the index by 0.00% is cheaper to own than a fund charging 0.03% that lags by 0.05%. Check a few calendar years of realised figures rather than one, because single-year numbers are noisy. If the concept is new to you, my tracking difference explained guide covers how to read the data on justETF in five minutes.
Fund-by-fund mini-verdicts
SPYL — the price leader
Cheapest headline fee, physical, accumulating, growing fast. The default pick for new monthly savings plans where every basis point compounds and liquidity needs are small. Its only real drawbacks are youth and (relative) size.
SPY5 — the same fee, paid out
The older SPDR line, distributing, now matching SPYL’s ~0.03%. If you want quarterly cash income at the lowest fee in the category, SPY5 is quietly the best-priced distributing S&P 500 fund in Europe — cheaper than VUSA by roughly four basis points.
CSPX / SXR8 — the incumbent
The heavyweight: ~€130bn+, fifteen years of clean tracking, the deepest liquidity in the category, ~0.07%. Two listings, one fund — CSPX in USD on the LSE, SXR8 in EUR on Xetra. For large lump sums, or investors who value scale above all, it remains the safest pair of hands. Full details in the CSPX factsheet.
VUAA / VUAG / VUSA — the Vanguard family
Same index, same Irish domicile, ~0.07%. VUAA is the accumulating fund (VUAG its GBP London line); VUSA the distributing sibling. Functionally interchangeable with the iShares fund — the choice is issuer preference and broker availability, a coin-flip I dissect in CSPX vs VUAA. The accumulating case is set out in the VUAA factsheet.
SPXP / P500 — the synthetic outperformer
Middling ~0.05% fee, but the withholding-free swap has made it the strongest realised tracker in the category for years. The right choice for investors who understand and accept collateralised counterparty risk in exchange for a structural return edge.
Which cheapest S&P 500 UCITS ETF should you pick?
- Monthly savings plan, accumulating, fee-focused: SPYL. The lowest TER where it matters most — small, regular purchases held for decades.
- Best realised performance, comfortable with swaps: SPXP (or P500 for income). The withholding edge has beaten the fee gap in practice.
- Large lump sum, liquidity first: CSPX or SXR8. Four basis points is a fair price for the deepest market and longest record.
- Vanguard loyalist or VWCE holder: VUAA — one issuer, one ecosystem, no meaningful cost penalty.
- Quarterly income at the lowest fee: SPY5, with VUSA as the bigger, marginally dearer alternative.
And a note of proportion: whichever you choose, you own essentially the same 500 companies. Nobody’s retirement will be decided by this choice. It will be decided by how much you invest and whether you stay invested.
Where to buy them
Availability varies more than price does. On Trade Republic and Scalable Capital, the German-venue lines are what you will find: SXR8 rather than CSPX, VUAA rather than VUAG, plus SPYL and SPXP — most of them eligible for free or near-free savings plans, which suits the SPYL-style monthly accumulator perfectly. I walk through the exact order flow in how to buy an S&P 500 ETF on Trade Republic.
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Revolut’s investment tab also carries the mainstream S&P 500 UCITS funds and now supports recurring ETF orders in much of the EEA, though its fund menu is thinner — check that your preferred ticker is actually listed before planning around it. Interactive Brokers offers every line on every exchange, which makes it the flexible choice for USD buyers wanting CSPX on the LSE. Whatever the platform, compare the all-in cost: a free savings plan on a 0.07% fund routinely beats a commission-charging route into a 0.03% one.
My take
If I were starting a fresh monthly plan today, I would buy SPYL and not overthink it: the cheapest fee, physical replication, and a fund that will be enormous within a few years at its current growth rate. For a six-figure lump sum, I would still lean CSPX or SXR8 — scale and a fifteen-year record are worth four basis points when you are placing one large order rather than a hundred small ones. And the fund I think is genuinely underrated is the Invesco synthetic: the withholding advantage is structural, not luck, and the market persistently underprices it because “synthetic” sounds scarier than it is.
What I would not do is sell an existing 0.07% holding to chase the 0.03% fund. A taxable switch costs capital-gains tax and dealing fees that can wipe out a decade of the fee saving. The cheapest fund question matters at the moment of purchase; it almost never justifies unwinding a position.
Common mistakes
- Confusing SPYL and SPY5. Both SPDR, both ~0.03% — but SPYL accumulates and SPY5 distributes. Buy the structure you actually want.
- Ranking funds by TER alone. Realised tracking difference is the true cost, and it regularly reorders the fee table.
- Ignoring the synthetic option out of vague fear. The swap structure’s withholding edge is real; the counterparty risk is capped and collateralised. Reject it on informed grounds if you must, not on the word “synthetic”.
- Paying trading costs that dwarf the fee saving. FX conversion charges or commissions on the “cheap” fund can exceed the TER gap many times over.
- Switching an existing holding to save 0.04%. Taxes and dealing costs usually make this a losing trade.
- Treating any of these as diversification. Every fund here is a 100% single-country, tech-heavy bet. Hold it deliberately.
Key takeaways
- SPYL (~0.03%) is the cheapest S&P 500 UCITS ETF by headline TER; SPY5 offers the same fee in a distributing wrapper.
- Invesco’s synthetic SPXP/P500 (~0.05%) avoids US dividend withholding entirely via its swap, and has often delivered the best realised tracking.
- CSPX/SXR8 and VUAA/VUSA (~0.07%) charge more but bring unmatched scale, liquidity and long records.
- Tracking difference beats TER — judge funds on several years of realised numbers, not the sticker price.
- Broker availability and trading costs (FX, commissions, savings-plan eligibility) can outweigh the entire TER gap.
- All TERs here are illustrative; confirm live figures on justETF or the issuer factsheet before buying.
FAQ
Q: What is the cheapest S&P 500 UCITS ETF in 2026?
A: By headline TER, SPDR’s SPYL at roughly 0.03% (SPY5 matches it in distributing form). By realised all-in cost, Invesco’s synthetic SPXP has often been cheaper to own thanks to its withholding-tax-free swap. Verify current fees on justETF.
Q: What is the difference between SPYL and SPY5?
A: Both are SPDR S&P 500 UCITS ETFs at ~0.03%. SPYL (launched 2023) accumulates dividends internally; SPY5 (launched 2012) pays them out quarterly. Same index, same fee, different distribution policy.
Q: Is SPYL better than CSPX?
A: SPYL is cheaper (~0.03% vs ~0.07%); CSPX is far larger, more liquid and longer-established. For monthly savings plans SPYL’s case is strong; for large positions CSPX’s depth is worth the extra basis points. Both are excellent.
Q: Why does the Invesco S&P 500 ETF beat physical funds despite a higher TER than SPYL?
A: Its swap delivers the gross index return with no US dividend withholding, worth roughly 0.2% a year at current yields — more than the entire TER gap. Physical Irish funds lose 15% of each US dividend to withholding tax.
Q: Is a synthetic S&P 500 ETF safe?
A: UCITS rules cap uncollateralised counterparty exposure at 10% of assets, and in practice funds like SPXP hold collateral and use multiple swap banks. The risk is modest but real — a deliberate trade-off for better tracking.
Q: Are CSPX and SXR8 different funds?
A: No — one fund, ISIN IE00B5BMR087, two listings. CSPX trades in USD in London; SXR8 in EUR on Xetra. Holdings, TER and performance are identical.
Q: What is tracking difference and why does it matter more than TER?
A: Tracking difference is the fund’s actual annual return minus the index return — the realised cost after fees, taxes and lending revenue. A low-TER fund can still lag the index by more than a dearer rival, so the audited result beats the advertised fee.
Q: Which of these ETFs can I buy on Trade Republic or Scalable Capital?
A: The German-venue lines: SXR8, VUAA, SPYL and SPXP are all available, most with free savings plans. CSPX and VUAG, as London listings, generally are not.
Q: Should I switch my existing S&P 500 ETF to the cheapest one?
A: Usually not. Selling can trigger capital-gains tax and dealing costs that exceed decades of a 0.04% fee saving. Direct new money to the cheaper fund instead if the gap bothers you.
Q: Do all these funds have the same holdings?
A: The physical funds hold essentially identical baskets of ~500 US large-caps; the Invesco fund replicates the same index return via a swap. Your market exposure is the same S&P 500 either way.
Cited sources: justETF and Morningstar. Check current TER, AUM and holdings on the issuer factsheet — figures change.
Not personalised financial advice. Verify your situation with a qualified adviser. Operated by Aurum Digital Marketing LTD (UK), Companies House 15203665.
European UCITS/ETF investor with 11+ years building a global dividend and index portfolio, and founder of Financial Expert Class. I write every guide here from first-hand experience investing across EU brokers and tax regimes — not theory. More about me →