A Client balance reflects the total funds a Client has paid into or owes on their account, including transactions related to Lessons, Credit Requests, Ad Hoc Charges, refunds, balance adjustments & more.
To access this information, go to People > Clients > select the Client > Accounting. This section displays their full accounting history, including Invoices and payment records.
Clients' accounting page, displaying their balance.
TutorCruncher shows two balance figures here, and they are calculated differently — see here for the difference between the Invoice Balance and the Available Balance. To see every Client's balance in one list instead, go to Accounting > Client Balances.