Anaccountis a record of all the money a person or company spends and receives. It is usually used in the plural.
The company's accounts show a loss in the first quarter.
The written records for an account are calledthe books.
I let our accountant do the books.
That transaction wasoff the books(= not written down in the account record).
Abank statement, or simply astatement, is a record of the money you have deposited and taken out of the bank.
I receive a monthly bank statement.
The bank sends me a statement every month.