ETF from Ireland or Luxembourg: What is the difference?

📘 In Brief The decisive difference between ETFs from Ireland and Luxembourg lies in the withholding tax on US dividends. Ireland has a tax treaty with the USA that withholds only 15% withholding tax on American dividends, while Luxembourg deducts 30%. Since most global equity ETFs invest heavily in US companies, the higher tax in Luxembourg noticeably reduces returns. In addition, the Irish fund structure is often more tax-efficient because it better protects accumulating earnings from foreign taxation. For private investors, this means: an Ireland ETF generally delivers a higher net return for the same index. The choice of fund domicile is therefore more important than the provider or the exact index replication method. Luxembourg remains attractive only for special niches or bond ETFs, where the tax burden is lower. 🔍 Why This Matters The relevance arises from the tax treatment of accumulating funds at the investor level, since Ireland and Luxembourg, as dominant fund domiciles, have different withholding tax treaties with the USA. In particular, the reduced US withholding tax of 15% on dividends (instead of 30%) for Irish funds leads to a structurally higher net return, which has a significant impact on final wealth over long investment horizons. Moreover, national regulations on the advance lump sum (Vorabpauschale) and partial exemption do not differ by domicile, which focuses the decision purely on the level of foreign withholding tax and fund structure (UCITS vs. Non-UCITS). This is relevant for private investo …