How to invest into S&P500? SPY ETF is domiciled in US and has a higher expense ratio than some of its peers. VOO ETF is a good alternative.
If you are an investor from Singapore or basically most Non US residents, consider using CSPX which is domiciled in Ireland and reinvest for you dividends.
The reason is because firstly there is withholding tax on non-us residents taxed 30% on dividends received. Ireland-Domiciled ETFs benefit from the US-Ireland tax treaty of only 15% withholding tax on dividends.
Secondly, there is also estate tax from $60,000 of US holding for nonresident aliens, and apply at rates of 26-40% of assets above that level.
More important where it is domiciled.