So is an ETF like VEUR tax optimal for a Swiss resident? What is then the effective withholding tax rate? For SP500 you need to buy US domiciled ETFs and the submit a DA-1 to get 0% tax rate.
From reading this: https://www.cash.ch/news/top-news/ausland-aktien-wie-fordere-ich-steuern-auf-auslaendischen-dividenden-zurueck-1095541 it appears that I might lose 30% of dividends in withholding taxes if I do not file DA-1.