Cashbook

Definition

A cashbook is the accounting record of all money received and paid out through a business's bank and cash accounts. It is the primary record of actual cash movements, reconciled against the bank statement to keep the two in step.

In plain terms

Every receipt and payment is entered in the cashbook, which is why it is the natural starting point for a bank reconciliation and for building a cash flow picture grounded in real transactions.

Why it matters

An accurate cashbook is the bedrock of reliable cash management. See bank reconciliation and cash position.

In practice

For a UK limited company, the cashbook usually takes shape as a simple ledger sitting alongside the accounting software, updated as receipts and payments clear the business bank account. A director or bookkeeper enters each transaction as it happens, rather than waiting for a formal statement, so the cashbook tends to run slightly ahead of the bank feed and is reconciled back against it periodically.

In a small company the same person is often responsible for both raising invoices and keeping the cashbook current, which makes discipline around timely entry the main safeguard against drift. Where a business uses more than one account, say a main current account and a separate deposit or reserve account, good practice is to keep a distinct cashbook line for each, so the combined cash position can be built up accurately rather than estimated.

Common pitfalls

The most frequent problem is simply falling behind: transactions pile up unrecorded, and by the time someone sits down to reconcile, the gap between the cashbook and the bank statement has grown large enough that errors are hard to trace back to their source. Keeping entries current, even briefly and informally, avoids this build-up.

A second pitfall is treating the cashbook as a substitute for full double-entry accounting rather than a complement to it. The cashbook records cash movements only, it does not capture accruals, unpaid invoices, or non-cash adjustments, so relying on it alone can give a misleadingly narrow view of the company's financial position. Pairing it consistently with a proper bank reconciliation keeps both records honest and catches timing differences, duplicated entries, or missed transactions before they compound.