What it means
The letter is a formal reply to a standard request, sent by the auditor with the client's written authority. It confirms what the bank's own records show at one specific date, which is why it is often called a bank confirmation or an audit confirmation.
Cash is the balance most exposed to both error and deliberate manipulation, and it is also the easiest figure to verify from outside the business. A confirmation lets the auditor test reported cash without relying on a statement that management could, in principle, have altered.
A good confirmation goes well beyond the current account balance. It should list every account in the customer's name, term deposits, overdraft and loan facilities with their limits and drawn amounts, any charges or guarantees the bank holds, and off-balance-sheet items such as letters of credit.
Undisclosed facilities are exactly the kind of omission the exercise is designed to catch. In practice the finance team signs an authority, the auditor submits the request, and the bank replies within a few weeks, usually charging a fee for the service.
Many banks now handle the whole exchange through a secure electronic confirmation platform, which cuts turnaround from weeks to days. A confirmation letter is not the same thing as a bank reference or a proof-of-funds letter, though people mix them up constantly.
A reference offers a general opinion on creditworthiness, while a confirmation states verifiable facts at a date, and only the second carries real audit weight.
In practice
Real-world examples.
Example
An engineering group with subsidiaries in four countries sends confirmation requests to nine banks as part of its year-end audit. Two replies list overdraft facilities the group treasurer had forgotten to disclose, and the notes to the accounts are amended before signing.
Example
A private equity buyer asks the target company's auditor to obtain fresh confirmations before completion. The letters reveal a $250,000 guarantee the target had given in favour of a former sister company, which becomes a specific indemnity in the sale agreement.
Example
A charity's trustees request confirmations for all restricted fund accounts. The bank's reply shows that one legacy account had been quietly used as security for the charity's overdraft, prompting a governance review.
Formula
Calculation
The confirmed balance is used to prove the company's own cash figure through the standard reconciliation: book cash balance = confirmed bank balance - outstanding cheques + deposits in transit, adjusted for any other timing items.
Suppose the bank confirms a balance of $482,000 at the year end. The company has written cheques totalling $37,500 that had not yet been presented, and had banked $15,000 on the last afternoon of the year that the bank did not process until the following day. The reconciled book balance is $482,000 - $37,500 = $444,500, then $444,500 + $15,000 = $459,500. If the ledger shows $459,500, the cash balance is proved; any difference has to be investigated before the accounts are signed.Case study
Seen in the real world.
Ferngate Logistics is an illustrative, invented haulage business used here purely to show how these letters work. Its accounts showed cash of $1,180,000 and no borrowings other than a disclosed $400,000 overdraft facility, and management expected the audit to be routine.
The bank confirmation came back listing a second facility: a $250,000 guarantee Ferngate had given three years earlier to support a joint venture depot. Nobody currently in the finance team had been involved in that arrangement, and the paperwork sat in a folder at a site office rather than in head office records.
Because the confirmation surfaced it, the guarantee was disclosed as a contingent liability and the joint venture arrangement was reviewed and unwound. In this fictional example the letter cost the company a small bank fee and saved it a difficult conversation with its lenders a year later.
Watch out
Common mistakes.
- Letting the finance team collect the confirmation and forward it to the auditor, which destroys the independence that gives the document its value.
- Assuming a confirmation covers only cash balances, when its most useful content is often the list of borrowings, guarantees and security the company forgot to mention.
- Treating a nil reply or a partial reply as a clean answer, rather than chasing the bank for the specific items left blank.
Questions
People also ask.
Who is allowed to request a bank confirmation letter?
The auditor requests it, but the bank will only respond once the customer has given written authority, so the company still controls the release.
How long does a bank confirmation letter take to arrive?
Paper requests commonly take two to four weeks, while electronic confirmation platforms often return a reply within a few working days.
Does a bank confirmation prove the accounts are correct?
No, it only verifies what the bank's records show at one date, and the auditor still has to reconcile that figure to the company's own ledger.
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