‘Current earnings’ in the Moneybox app refers to the overall gains/losses made on your account balance so far. You may also see this referred to as your simple return. This figure takes into account:
Your investment gains/losses
Any fees deducted
Any Moneybox+ rewards and/or LISA bonuses added to your account (if applicable).
You can see each of the above individually by tapping ‘breakdown' in the Accounts tab.