When linked to Stockback™ rewards, there are no fees to set up your Portfolio.
A fee of $3.99 is only charged every 28 days on Portfolio balances over USD $50.
If you choose to invest even more into your Portfolio, or start to trade US Shares, you will also be charged the usual W8-BEN fee and other trading costs can apply.
See here for a breakdown of all the main costs of using specific features of Douugh: