O5047100 (ôf′thə-bo͝oks′, ŏf′-)adj. Not reported or accounted for as required by law, especially in order to avoid the payment of taxes: off-the-books income.
off′-the-books′
adj. not recorded in account books or not reported as taxable income: off-the-books payments.[1960–65] FinancialSeeOff the Books