📅 Last updated: 8 May 2026
· 🏷 Topic: S&P 500, VUSA, CSPX, VOO, US equities
· 🇧🇪 For: Belgian investors
The S&P 500 is the best-known US equity index and the most-followed benchmark in the world. For Belgian retail investors, specific UCITS versions of S&P 500 ETFs are available — US versions (VOO, SPY, IVV) are NOT purchasable due to PRIIPs regulation.
The UCITS S&P 500 options
| ETF | ISIN | Issuer | TER | Distribution / Acc | TOB |
|---|---|---|---|---|---|
| CSPX | IE00B5BMR087 | iShares | 0.07% | Acc | 0.12% (?) |
| VUSA | IE00B3XXRP09 | Vanguard | 0.07% | Distribution | 0.12% |
| VUAA | IE00BFMXXD54 | Vanguard | 0.07% | Acc | 1.32% (compartment rule: VUSA is BE-registered, so the accumulating sister VUAA is treated as BE-registered too — verify on the FSMA fund register) |
| Note: “SXR8” is not a separate ETF — it is the Xetra ticker for CSPX (same fund, IE00B5BMR087). Belgian brokers often show one or the other depending on the exchange. | |||||
| IUSA | IE0031442068 | iShares | 0.07% | Distribution | 0.12% |
⚠️ Verify TOB status before purchase: Each ETF’s TOB rate depends on its Belgian registration status. Non-registered = 0.12% per side; BE-registered accumulating = 1.32% per side (an 11x difference, capped at €4,000 per transaction). The compartment rule applies: if any compartment of a fund is BE-registered, every compartment is treated as BE-registered — that is why VUAA (accumulating) inherits VUSA’s BE registration. Always verify the current status on the FSMA fund register or via tobcalc.com before a large purchase.
Why an S&P 500 ETF?
For:
– Low TER (~0.07%) — below most world ETFs.
– Broad US exposure — the 500 largest US companies.
– High liquidity — one of the most-traded indices in the world.
– Strong historical performance since 2009.
Against:
– No geographic diversification — US only.
– Concentration in Big Tech — Apple, Microsoft, Nvidia, Meta, Google, Amazon = ~30% of the index.
– High historical valuation — S&P 500 stands (May 2026) at a higher P/E than other markets.
S&P 500 vs MSCI World
Differences:
| S&P 500 | MSCI World | |
|---|---|---|
| Number of holdings | 500 | ~1,300 |
| Geographic | 100% US | ~70% US, rest Japan/Europe/etc. |
| Sector | US-tech-heavy | Slightly more diversified |
| Historical return | Often higher over the last 15 years | Slightly lower |
An MSCI World ETF (such as IWDA) already contains ~70% US equities. Anyone adding an MSCI World + S&P 500 doubles their US exposure to 80–90% — overweighting the American share.
Strategic role
Option 1 — S&P 500 as core:
– 100% S&P 500 ETF (CSPX, VUAA, etc.).
– Pro: low TER, high liquidity.
– Con: no exposure to non-US economies.
Option 2 — S&P 500 as a “tilt” on top of MSCI World:
– 70% IWDA (MSCI World)
– 30% CSPX (S&P 500)
– Effect: ~80% US, 20% rest of the world
– For those who believe more in the US economy.
Option 3 — Avoid altogether, go for MSCI World or FTSE All-World:
– 100% IWDA or VWCE.
– For those who value worldwide diversification more than an optimally low TER.
Distribution versus accumulation
Before 2026, the tax advantage of accumulating ETFs over distributing ETFs was clear: you avoided 30% dividend withholding tax on reinvested dividends. Since 1 January 2026, Belgium’s 10% capital gains tax applies to realised gains above €10,000/year — for both accumulating and distributing ETFs on disposal. For most long-term buy-and-hold investors, the accumulating variant remains more tax-efficient (the 30% dividend withholding tax saved each year typically outweighs the 10% CGT paid only on sale), but the margin has narrowed:
- CSPX or VUAA for accumulating.
- VUSA or IUSA for distributing (quarterly dividend).
See Accumulating vs distributing (NL) and the 2026 capital gains tax callout below.
Common mistake
Buying MSCI World + S&P 500 + Nasdaq + sector tech ETF at the same time thinking it is diversification. It is not. Apple, Microsoft, Nvidia then sit in 4 funds. Result: extreme concentration in 5–10 mega-cap tech stocks.
💡 A world index (VWCE/IWDA) is, for most Belgian beginners, a safer choice than a pure S&P 500 fund — broader risk spread, comparable expected return over the very long term.
🔗 See World ETF top choices, IWDA vs VWCE (NL), and Diversification explained.
2026 capital gains tax (in brief)
💰 Since 1 January 2026, Belgian retail investors pay a 10% capital gains tax on realised gains above €10,000/year per person (with a €1,000/year carry-forward, max €5,000 cumulative). This applies to all S&P 500 UCITS ETFs (CSPX, VUSA, VUAA, IUSA) — both accumulating and distributing — on disposal. Belgian-licensed brokers (Bolero, Keytrade, MeDirect, Saxo Belgium) withhold automatically from 1 June 2026; users of foreign brokers (DEGIRO, IBKR, Trade Republic) must declare it themselves. Step-up basis on 31 December 2025: only gains above that reference value count. Law of 6 April 2026, BS 21 April 2026.
🔗 Full explanation: Belgian investment taxes.
Sources
- iShares — CSPX, IUSA factsheet
- Vanguard — VUSA, VUAA factsheet
- justETF — S&P 500 UCITS overview
ETF Investing in Belgium (Complete Guide)
ETF investing in Belgium: UCITS vs US ETFs, TOB tiers, accumulating vs distributing, IWDA, VWCE and tax treatment. Complete 2026 beginner guide.
Mutual Fund vs ETF for Belgian Investors
Mutual fund vs ETF for Belgian investors: total cost, distribution channels, tax treatment, and why most Belgian funds underperform a low-cost ETF.
How Many ETFs Do You Need? Belgian Guide
How many ETFs does a Belgian investor really need? One-fund, two-fund and three-fund portfolios compared with brokers, costs and tax efficiency.
