For non-U.S. residents, with a completed U.S. Tax Form (W-8BEN etc.) the withholding tax is 15%. We arrange to have this form completed and lodged on your behalf by our U.S. broker partner. 

However, without completing and lodging the U.S. Tax Form (W-8BEN etc.) the withholding is 30%.

This withholding amount is only on dividends paid and not on share sales. 

Please note that due to the complexities involved with tax, please obtain independent & professional advice that takes into account your own set of facts and circumstances.