I bought a Vanguard S&P 500 ETF that is issued in Ireland, yet my country of residence is the Netherlands (I'm doing this since from what I see there is no current Dutch ETF that follows the S&P 500). Now from what I read, since the ETF is outside my residence country I need to pay dividend tax (Dutch law would have allowed me to reclaim the withholding dividend tax had the ETF been Dutch). Now a tough one: Since Irish dividend tax is 20%, how can I I evaluate how much the ETF really costs? I know there is no direct proportion between dividend paid and capital gains (stock prices), I'm just trying to estimate in the long run how much it costs me to hold a foreign (Irish) ETF over a homemade one. If I could for example get an approximate number and add it to the management fee to get a real sense of what the ETF really costs that would be great...
According to https://ycharts.com/indicators/sp_500_dividend_yield the dividend yield is about 2%.
Thus, the cost is 20% of 2%. If there's both Irish and Dutch tax, then you'd add the two taxes together and multiply by 2%.