4.1 The Cash Book

The Cash Book

The cash book is a unique and fundamental component of any double-entry bookkeeping system. Unlike other books of prime entry, such as the Sales Day Book or the Purchases Day Book, which serve purely as chronological diaries of transactions, the cash book serves a dual purpose. It functions both as a book of prime entry—where cash and bank transactions are first recorded—and as the actual ledger accounts (the Cash Account and the Bank Account) in the general ledger. Therefore, any entry made in the cash book is a direct posting to the ledger, and its balances form a direct part of the double-entry system.

The Dual-Column Structure

A dual-column cash book is structured to record two types of monetary assets separately: physical cash held on the business premises (in a till or safe) and bank funds held in the business's current bank account. To achieve this, both the receipts (debit) side and the payments (credit) side contain two main monetary columns:

1. Cash Column: For recording physical bank notes and coins received or paid.
2. Bank Column: For recording transactions flowing through the bank account, including electronic transfers, cheques, and direct bank charges.

Standard Layout of a Dual-Column Cash Book

The cash book is split into two halves: the debit (left-hand) side for all receipts, and the credit (right-hand) side for all payments. The columns typically include:

• Date: The date the transaction occurred or appeared on the bank statement.
• Reference/Voucher Number: The cheque number, receipt number, or electronic transaction reference.
• Details: The name of the customer, supplier, or account associated with the transaction.
• Folio: A cross-reference code linking the entry to the subsidiary ledger (e.g., Sales Ledger 'SL' or Purchase Ledger 'PL') or the General Ledger ('GL').
• Cash (£): The column for physical cash transactions.
• Bank (£): The column for bank-account-based transactions.

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Recording Bank Receipts

All receipts of money into the business's bank account are recorded on the debit side of the cash book in the Bank column. These receipts can arise from various sources and methods:

• BACS (Bankers' Automated Clearing System) and Faster Payments: Direct electronic bank transfers from credit customers paying off their outstanding balances. The detail recorded is the customer's name, and the entry is cross-referenced to the customer's account in the Sales Ledger.
• Cheques: Customers may pay by cheque. Although cheques are physical documents, they are paid directly into the bank account, so they are recorded in the Bank column on the debit side.
• Standing Orders and Direct Debits: While these are primarily payment methods, a business may occasionally receive regular fixed payments from customers via standing orders, or collect variable amounts via direct debits. These are recorded in the Bank column on the debit side upon receipt of bank notification.

Double-Entry Note: For receipts from credit customers, the double-entry is completed by crediting the Trade Receivables Control Account (TRCA) in the general ledger and crediting the individual customer's account in the Sales Ledger. The VAT is not calculated or split here, as it was already recorded when the sales invoice was originally issued.

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Recording Bank Payments

All payments out of the business's bank account are recorded on the credit side of the cash book in the Bank column. Common bank payments include:

• Cheque and Electronic Payments (BACS/Faster Payments): Payments to credit suppliers for raw materials or goods. The detail is the supplier's name, cross-referenced to the Purchase Ledger.
• Standing Orders (SO): A business instruction to its bank to pay a fixed amount of money to a specific recipient at regular, set intervals (e.g., monthly office rent of £500). Since these are automated, they are recorded in the cash book directly from the bank statement.
• Direct Debits (DD): An authorization given to a third party (such as a utility provider) allowing them to withdraw varying amounts of money from the business's bank account (e.g., monthly electricity bill of £150). Like standing orders, these must be recorded when the bank statement is reviewed.
• Bank Charges and Interest: Fees levied by the bank for account maintenance, overdraft facilities, or transaction processing. These are payments and must be credited to the Bank column. The corresponding debit goes to the Bank Charges Expense account in the general ledger.

Contra Entries

A contra entry occurs when money is transferred between the bank account and physical cash within the business. Because both the cash and bank accounts are held within the cash book, no external general ledger accounts are affected.

• Bank to Cash (Cash Withdrawal): If the business withdraws £100 cash from the bank to top up the office till, the bank balance decreases and physical cash increases. This is recorded as a credit in the Bank column and a debit in the Cash column. A 'C' is written in the Folio column on both sides to indicate it is a contra entry.
• Cash to Bank (Cash Deposit): If the business deposits £200 cash into the bank account, physical cash decreases and the bank balance increases. This is recorded as a credit in the Cash column and a debit in the Bank column, also marked with 'C' in the Folio.

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Balancing and Carrying Forward Balances

To manage cash flow and ensure records match reality, the cash book must be balanced regularly (usually weekly or monthly) and reconciled against the bank statement. The process of balancing the cash book involves the following mechanical steps:

1. Total the Columns: Sum the debit side and the credit side for both the Cash and Bank columns.
2. Determine the Balancing Entry (Balance c/d):
   • For the Cash column, the debit side (receipts) must always be greater than or equal to the credit side (payments), as a business cannot spend physical cash it does not have. The difference is entered on the credit side as Balance c/d (carried down) to make the sides equal.
   • For the Bank column, if the debit side is larger, the difference is written on the credit side as Balance c/d. If the credit side is larger (meaning the bank is overdrawn), the difference is written on the debit side as Balance c/d.
3. Draw Totals: Enter the equal totals on both sides, drawing a single line above and double lines below the total.
4. Bring Down the Balance (Balance b/d): Write the balance in the opposite column below the double lines as Balance b/d (brought down). A debit balance b/d is an asset. A credit balance b/d in the Bank column represents a bank overdraft, which is a current liability.

Worked Example: Balancing the Cash Book

Below is a worked example demonstrating the entries and balancing process for the month of July 2026.

Transactions:

• 1 July: Opening balances: Cash £200 (Dr), Bank £1,800 (Dr).
• 3 July: Received cheque from customer J. Doe for £480.
• 7 July: Paid rent via standing order: £600.
• 10 July: Cash sales of £240 inclusive of 20% VAT (Debit Cash £240; double-entry: Credit Sales £200, Credit VAT Control Account £40).
• 15 July: Paid supplier T. Smith by cheque: £700.
• 20 July: Received BACS payment from customer M. Ray for £550.
• 24 July: Paid electricity bill via direct debit: £120.
• 28 July: Withdrew £100 from Bank to Cash (Contra entry: Credit Bank £100, Debit Cash £100. Marked with 'C' in Folio).
• 31 July: Bank charges of £30 entered from the bank statement.