Banks in Japan provide passbooks which you can insert into the ATM machines to print your transactions. In most cases this is fine for tax audit. But for other compliance related audits, banks can issue certificate of balance outstanding in English with extra charge. Interest arising from bank accounts is withheld income tax and inhabitant tax so amounts printed in passbooks are net figures after withholding amount. Banks also issue interest statement of gross amount on paper so it is important to preserve this document. Depending on how you process payments, passbook printouts may only show a lump sum of payment not being able to identify transaction one by one.