Detailed Comparison CW8 vs IWDA: Which MSCI World ETF to Choose in 2026?
Investing in an MSCI World ETF is a popular global diversification strategy among retail investors. In France, two ETFs dominate this segment: CW8 from Amundi and IWDA from iShares. Both provide exposure to large and mid-cap stocks in developed countries, but their characteristics differ on several key points — fees, taxation, replication method, domicile, etc. This article offers a comprehensive comparison in 2026 to help you choose the ETF best suited to your profile and account type (PEA or standard brokerage account).
Comparison Table: CW8 vs IWDA
Characteristic
CW8 (Amundi MSCI World)
IWDA (iShares Core MSCI World)
ISIN
FR0010756098
IE00B4L5Y983
TER (Total Expense Ratio)
0.38%
0.20%
Replication Type
Synthetic (swap)
Physical (direct replication)
PEA Eligibility
Yes (PEA France)
No (standard brokerage account only)
Assets Under Management (AUM)
~€7.5 billion (2026)
~€50 billion (2026)
Domicile
France
Ireland
Detailed Analysis of Key Features
1. Management Fees and Long-Term Impact
The TER of IWDA is significantly lower (0.20%) than that of CW8 (0.38%). This 0.18 percentage point difference may seem minor annually but accumulates over several years.
For example, investing €1,000 per month for 20 years with a hypothetical gross annual return of 6%, the estimated impact (before taxes) is as follows:
CW8 (TER 0.38%): accumulated capital net of fees ≈ €430,000
IWDA (TER 0.20%): accumulated capital net of fees ≈ €435,000
The fee difference thus results in approximately €5,000 over 20 years.
2. Tax Advantage of the PEA with CW8
The main advantage of CW8 is its eligibility for the Plan d’Épargne en Actions (PEA), which offers exemption from capital gains and dividend taxes after 5 years of holding (excluding social contributions). Conversely, IWDA is not PEA-eligible and must be held in a standard brokerage account (CTO) subject to regular taxation.
Taking this exemption into account, the tax savings over 20 years are substantial. Using the same investment scenario (€1,000/month, 6% gross return):
Without PEA (IWDA in CTO): social contributions + capital gains tax ≈ 30% (on average)
With PEA (CW8): capital gains tax exemption after 5 years + social contributions at 17.2% only
Over 20 years, this difference generates a net tax gain of about €30,000 in favor of CW8, six times greater than the savings from management fees.
3. Synthetic vs Physical Replication
CW8 uses synthetic replication via swaps, meaning the ETF does not directly hold all the securities of the MSCI World index but enters into a contract with a financial counterparty that guarantees the index’s performance.
This method often allows better tax optimization and reduced tracking error but carries a counterparty risk. However, UCITS regulations limit this risk to a maximum of 10% of assets, and Amundi uses multiple counterparties to mitigate this risk. Additionally, the collateral is generally high quality and regularly adjusted.
In comparison, IWDA physically invests in the index’s stocks, eliminating counterparty risk but sometimes incurring higher costs and less perfect replication.
4. Actual Tracking Difference
The tracking difference measures the performance gap between the ETF and its benchmark index. Over the past 5 years:
CW8 shows a positive tracking difference of about +0.05% per year
IWDA has an even lower tracking difference, around +0.01% per year
These figures indicate both ETFs closely track the MSCI World index, with a slight edge for IWDA in precision.
Verdict: Which MSCI World ETF to Choose in 2026?
For most French investors using a PEA, CW8 is clearly the preferred choice. Despite a higher TER (0.38% vs 0.20%), the long-term tax advantage of the PEA more than compensates for this difference, enabling a net value creation of several tens of thousands of euros over 20 years.
For investors who cannot or do not wish to use a PEA (e.g., non-French tax residents, international profiles, or those investing via a standard brokerage account), IWDA is preferable. Its physical replication, very low TER, and very large AUM make it a highly liquid and efficient product.
Special Cases
Large Amounts (> €150,000 on PEA)
The PEA is capped at €150,000 in contributions. For amounts exceeding this, a standard brokerage account must be used. In this case, IWDA becomes more relevant for the excess amount, while CW8 remains attractive for the portion invested via the PEA.
Non-Resident Taxation
Non-French tax residents do not benefit from the PEA’s tax advantages. For them, IWDA is often better suited, notably due to its Irish domicile, a country known for efficient dividend taxation.
Investors Seeking Physical Replication
Investors wishing to avoid any counterparty risk, even limited, will prefer IWDA, which physically holds the underlying shares.
Practical Summary
PEA France, long-term horizon (10+ years), regular investing: CW8
Standard brokerage account, non-resident, physical replication, lower fees: IWDA
Amounts > €150k on PEA: combine CW8 (up to €150k) + IWDA (excess)
Disclaimer
The information contained in this article is provided for informational purposes only and does not constitute personalized investment advice. Past performance is not indicative of future results. Before making any investment decisions, it is recommended to consult a financial or tax advisor suited to your personal situation.
