All dividends of US-listed securities are subject to 30% dividend withholding tax and the QII (Qualified Interest Income) rule. The latter rule applies to US-domiciled funds, especially US government bonds, of which some of the dividend withholding taxes can be claimed back.
Our broker will do this on your behalf.
These taxes are applicable as long as you own US-listed assets, regardless of whether the assets were bought through StashAway, or via your own broker.
Additionally, these taxes are held at source and would have already been deducted from the dividend payments shown on your 'Transactions' tab.