A debit memorandum, often shortened to debit memo, is a document used to notify an account holder that their balance is being reduced for a fee, correction, or other charge. The most familiar example is a bank debit memo, which appears on a bank statement to inform a depositor that its account balance has been reduced for items such as a service charge, a check printing fee, or a bounced check from another party that the bank had to reverse.
How a debit memo affects the bank reconciliation
Bank debit memos are a routine item a company encounters while performing a bank reconciliation, since the bank reduces the account balance for these charges immediately, while the company may not learn about them, or record them in its own books, until the monthly bank statement actually arrives. A company reconciling its cash account needs to record a journal entry debiting the relevant expense account and crediting Cash for every debit memo appearing on the statement that has not yet been recorded in its own general ledger.
Debit memos outside of banking
A supplier or seller can also issue a debit memo to a customer, increasing, rather than decreasing, the amount that customer owes, typically used to correct an invoice that understated the correct amount or to bill for an additional charge after the original invoice was already sent. This use runs in the opposite direction of the more common credit memo, which reduces what a customer owes rather than increasing it.
Why debit memos matter for accurate bookkeeping
Failing to promptly record debit memos appearing on a bank statement is one of the most common reasons a company's own cash records drift out of sync with its actual bank balance, since bank fees and other automatic deductions happen outside the company's normal transaction-recording process and are only discovered when the statement is reviewed. A disciplined monthly bank reconciliation process, specifically designed to catch every debit memo and similar item, is the standard control businesses use to keep their recorded cash balance accurate and current.
A simple worked example
A company’s bank statement shows a $35 monthly service charge and a $150 debit memo for a customer’s check that bounced after the company had already deposited and recorded it as collected. During its bank reconciliation, the company records two entries: a debit to Bank Service Charge Expense and a credit to Cash for $35, and a debit back to Accounts Receivable and a credit to Cash for $150, restoring the receivable from the customer whose check failed to clear.
Why banks issue debit memos rather than simply notifying customers informally
A formal debit memo gives both the bank and the depositor a documented record of exactly why and when an account balance was reduced, which matters for dispute resolution if a customer later questions a charge, and for the depositor’s own internal bookkeeping, since the memo typically states the specific reason for the deduction rather than leaving the customer to guess from the bank statement alone.