USA ETF Comparison 2026
Honest answer up front: a separate USA ETF is usually unnecessary. A global ETF (MSCI World, FTSE All-World) already holds roughly 60–70 % US stocks. Buying a USA ETF on top is a deliberate overweight on the US — an active bet, not a must. We compare the cheapest S&P 500 and MSCI USA ETFs and show when a US tilt makes sense and when the world ETF already does the job.
Do you even need a USA ETF?
That’s the most important question — and it’s rarely asked. A globally diversified MSCI World or FTSE All-World already holds roughly 60–70 % US stocks, because the US is by far the largest equity market in the world. Adding a separate USA ETF deliberately raises that share further — you are actively overweighting the US relative to the rest of the world.
- World ETF alone: ~60–70 % US, automatically diversified across all developed markets — plenty for most investors.
- World ETF + USA ETF: the US share climbs to 80 % or more — that is an active overweight, not extra diversification.
- USA ETF only: 100 % one country, one currency — higher return potential, but also concentration risk.
The most important USA ETFs compared
If you do decide on a USA ETF, the choice is between the classic S&P 500 (500 large caps) and the slightly broader MSCI USA (500+ holdings including mid-caps). Cost differences are tiny and the index composition is virtually identical.
USA ETFs compared (as of June 2026)
| Product | ISIN | TER p.a. | Index |
|---|---|---|---|
| iShares Core S&P 500 | IE00B5BMR087 | 0.07 % | S&P 500 |
| SPDR S&P 500 | IE00B6YX5C33 | 0.03 % | S&P 500 |
| Amundi Prime USA | LU1931974858 | 0.05 % | Solactive GBS USA |
| iShares MSCI USA | IE00B52SFT06 | 0.03 % | MSCI USA |
S&P 500 vs. MSCI USA — what’s the difference?
Both indices cover essentially the same market. The S&P 500 holds 500 large US companies selected by a committee. The MSCI USA spans roughly 500–600 holdings and reaches a little deeper into the mid-cap space. In practice, return and risk track extremely closely over long periods — the choice is largely a matter of taste.
S&P 500 vs. MSCI USA
| Feature | S&P 500 | MSCI USA |
|---|---|---|
| Number of holdings | 500 | ~500–600 |
| Market coverage | ~80 % of US market | ~85 % of US market |
| Mid-caps | barely | a bit more |
| Cheapest TER | 0.03 % | 0.03 % |
The concentration risk: Magnificent 7
The key point before buying: both the S&P 500 and the MSCI USA are highly concentrated. The “Magnificent 7” (Apple, Microsoft, Nvidia, Amazon, Alphabet, Meta, Tesla) together make up roughly 30 % of the index. So a USA ETF is far less broadly diversified than its 500 names suggest — and a world ETF already holds those same giants right at the top anyway.
A USA ETF held alongside a world ETF adds no diversification — it doubles down on a bet: that the US keeps outperforming the rest of the world. That may pay off, but it may not. Thanks to the Magnificent 7 concentration, returns also hinge heavily on a handful of tech giants. If you consciously want that, run a US tilt; if you simply want broad exposure, a pure world ETF serves you better. Not investment advice.
When a US tilt makes sense — and when it doesn’t
A deliberate US focus can fit if you’re convinced long-term of US innovation and capital-market depth and accept the concentration risk. It does not make sense to buy a USA ETF just because it “performed best in recent years” — that’s performance-chasing. For the majority of investors: a world ETF with its ~65 % US weighting is entirely enough.
🌍 Tax: USA ETFs (German example)
USA ETFs are equity ETFs and taxed accordingly. The following are the German rules as an example — rules vary by country, so check your local ones:
- 30 % partial exemption (Teilfreistellung) on gains and distributions, because the equity share exceeds 50 %.
- The remainder is subject to the 25 % flat capital gains tax (Abgeltungsteuer) plus solidarity surcharge.
- For accumulating USA ETFs the advance lump-sum (Vorabpauschale) applies; the €1,000 annual saver’s allowance stays tax-free.
FAQ — USA ETF 2026
Do I need a USA ETF if I already hold an MSCI World?
No, not necessarily. An MSCI World or FTSE All-World already holds roughly 60–70 % US stocks, because the US is the largest equity market in the world. A separate USA ETF deliberately raises that share further and is therefore an active overweight on the US, not extra diversification. For most investors the world ETF alone is enough.
What is the best USA ETF in 2026?
The cheapest and largest USA ETFs are the SPDR S&P 500 (IE00B6YX5C33) and the iShares MSCI USA (IE00B52SFT06), each at a 0.03 % TER, plus the well-known iShares Core S&P 500 (IE00B5BMR087, 0.07 %) and the Amundi Prime USA (LU1931974858, 0.05 %). Long-term return differences are minimal; what matters is low cost and a large, liquid product.
What is the difference between the S&P 500 and the MSCI USA?
Both track essentially the same US equity market. The S&P 500 holds 500 large US companies; the MSCI USA spans roughly 500–600 holdings and reaches a little deeper into mid-caps (around 85 % vs 80 % market coverage). In practice return and risk are very close, so the choice is a matter of taste.
How big is the concentration risk in US ETFs?
Considerable: the seven largest tech companies (the Magnificent 7 — Apple, Microsoft, Nvidia, Amazon, Alphabet, Meta, Tesla) together make up roughly 30 % of the S&P 500 or MSCI USA. A USA ETF is therefore less broadly diversified than its 500 holdings suggest, and its return depends heavily on a handful of stocks.