Citigroup reported the "near miss" to the Federal Reserve and the Office of the Comptroller of the Currency, according to the Financial Times.

Citigroup Inc. erroneously credited $81 trillion to a customer’s account instead of $280 last April before reversing the transaction hours later, according to the Financial Times.

Citigroup (NYSE:C) erroneously credited a client's account with $81T in what should have been a $280 transaction, a mistake that could extend regulators' scrutiny as the bank attempts to convince them that it has fixed operational issues,

Citigroup credited $81 trillion to a customer’s account, instead of just $280, and took hours to reverse the transaction — an embarrassing “near miss” for a bank that has struggled to fix operational issues.