unpaid balance meaning in English

未偿差额
未付差额
未付余额, 余额未付

Unpaid balance of contribution could be recovered from the aided person as a civil debt due to dla under rule 16 of laccr
根据刑事案件法律援助规则第16 2条，未缴付的余额分担费用可作为受助人士结欠法援署署长的民事债务向受助人士追收。
The rate of interest to be charged on loans shall be fixed from time to time by the board of directors , but shall in no event exceed one per cent per month on unpaid balances
第廿五条贷款利率贷款利率得由董事会随时修订，惟?对不能超过欠付出差额之月息百分之一。