BAI, or the BAI file format, is a file format for performing electronic cash management balance reporting. The BAI format was developed and previously maintained by the Bank Administration Institute (BAI). One common application of the BAI format is for use by banks to transmit returned item data to customers (for example, checks which have been marked insufficient funds (NSF)). The current release is Cash Management Balance Reporting Specifications Version 2, typically referred to as BAI2.