Members can view their concession credit in the Balances section of the Member Dashboard. If the member owes money they have a negative balance (noted in red).
In the example screenshot below, the member that is signed in has $15 in their account, but one of the sub-accounts in their household owes for $5. The combined household total is therefore only $10.
The primary on the account could allocate some of their funds to cover the $5 the sub-account owes, using the Manage Household balances toggle box.
The primary purchaser could also take back funds from any of the sub-accounts.