Right now, we don't pay interest on cash on Account or cash held on Portfolios.
The Account cash facility is designed to help customers better manage their investments. It can help with balancing investing strategies to hold cash and can make it easier to decide where you want to invest the cash you hold on your InvestEngine account.
We may look to add the facility to pay out interest on cash in the future. Keep an eye out on our Community page for this and other updates to InvestEngine.