What Is a Cash Book? Understanding Its Role and Function
By Markets & Investing DeskUpdated Nov 10, 2026
Definition
A cash book is a book of original entry that records every cash and bank transaction in date order and also serves as a ledger, showing the cash and bank balances at any point.
Key takeaways
- The debit side records receipts and the credit side records payments, each with date, particulars, reference and folio columns.
- The cash column can never show a credit balance, while a credit balance in the bank column means the account is overdrawn.
- Contra entries, such as depositing cash into the bank, move money between columns without changing the combined total.
- Discount columns in a triple-column cash book are totaled and posted to ledger accounts, not balanced or carried down.
A cash book is a book of original entry that records every cash and bank transaction in date order: money received, money paid out, and transfers between cash on hand and the bank account. It also works as a ledger, because its running totals show how much cash and bank money the business holds at any point. That dual role is what separates it from an ordinary journal.
What Is a Cash Book?
A cash book is the first place a cash transaction is written down. In a manual or traditional double-entry system it also replaces the separate cash and bank accounts in the general ledger, because its cash and bank columns are balanced like accounts and their balances go straight to the trial balance. A cash account in the general ledger, by contrast, is only a summary account that receives postings from somewhere else.
Typical receipts recorded in a cash book include:
- Customer payments and cash sales
- Interest received and investment income
- Proceeds from selling an asset, such as equipment
- Loan proceeds and owner capital introduced
Typical payments include:
- Supplier and vendor payments
- Wages and salaries
- Rent, utilities and other operating bills
- Equipment purchases
- Loan repayments
- Transfers to petty cash
How a Cash Book Works
Format and Columns
The classic cash book format is a T-shaped page. The left side is the debit side and records all receipts. The right side is the credit side and records all payments. Each side carries the same basic columns:
- Date of the transaction, entered in chronological order
- Particulars, the account or person on the other side of the transaction (for example “Sales” or “Rent”)
- Voucher or reference number, linking the entry to a receipt, invoice or check
- Ledger folio (L.F.), the page or code of the ledger account the entry is posted to
- Amount columns: one, two or three depending on the type of cash book
Many small businesses and spreadsheet users skip the two-sided layout and use a single list with receipts and payments columns plus a running balance, or show payments in parentheses or with a minus sign. The bookkeeping is the same; only the presentation changes.
Larger organizations often split the cash book into a cash receipts journal and a cash disbursements journal, so different staff can handle incoming and outgoing money.
Balancing the Cash Book
At the end of a period (daily, weekly or monthly), each amount column is balanced:
Closing balance = Opening balance + Total receipts − Total payments
On paper, the closing figure is written on the smaller side as “Balance c/d” (carried down) so both sides total the same, then brought down on the opposite side as “Balance b/d” to open the next period.
Two rules apply:
- The cash column can never show a credit balance. A business cannot pay out more physical cash than it holds, so a credit balance in that column signals an error.
- The bank column can show a credit balance. That means the account is overdrawn, and the business owes the bank.
Contra Entries
When cash is deposited into the bank, or withdrawn from the bank for office use, both sides of the transaction sit inside the cash book. The deposit is entered on the debit side in the bank column and on the credit side in the cash column. These are contra entries, usually marked “C” in the folio column, and they move money between columns without changing the combined total.
Types of Cash Books
Single-Column Cash Book
The simplest version has one amount column on each side and records only physical cash. It suits a sole proprietor or small shop that handles little bank activity. The running balance equals cash on hand, which can be counted against the till at the end of each day.
Double-Column Cash Book
This version has a cash column and a bank column on each side, so one book tracks both cash on hand and the bank account. It is the natural choice for a business that takes cash and also pays and receives by check, card or transfer. Contra entries only arise in this format and the triple-column one.
Triple-Column Cash Book
The triple-column cash book adds a discount column on each side. Discount allowed (a cash discount given to a customer for paying promptly) goes on the debit side next to the receipt. Discount received (a discount a supplier grants for prompt payment) goes on the credit side next to the payment. The discount columns are not balanced like cash and bank. They are totaled and posted to the discount allowed and discount received accounts in the ledger, because a discount is an expense or income, not money that moved. Trade discounts are deducted from the invoice before any entry and never appear here.
Petty Cash Book
A petty cash book records small, frequent expenses such as postage, cleaning supplies or taxi fares. Under the common imprest system, the petty cashier starts with a fixed float, records each expense in analysis columns, and is then reimbursed by exactly the amount spent, restoring the float. The reimbursement appears in the main cash book as a single payment.
Example of a Cash Book
The following is a hypothetical week for a small print shop that uses a triple-column cash book. Opening balances: cash on hand $400, bank $3,000.
| Date | Transaction |
|---|---|
| Mon | Cash sales of $1,200 |
| Tue | Customer settles a $2,050 invoice by bank transfer of $2,000, with $50 discount allowed |
| Wed | Shop pays a supplier invoice of $1,530 by check for $1,500, with $30 discount received |
| Thu | Wages of $600 paid in cash |
| Fri | $700 of cash deposited into the bank (contra) |
| Fri | Bank charges of $25 noted on the bank statement |
Debit side (receipts)
| Date | Particulars | L.F. | Discount | Cash | Bank |
|---|---|---|---|---|---|
| Mon | Balance b/d | 400 | 3,000 | ||
| Mon | Sales | 1,200 | |||
| Tue | Customer account | 50 | 2,000 | ||
| Fri | Cash (deposit) | C | 700 | ||
| Total | 50 | 1,600 | 5,700 |
Credit side (payments)
| Date | Particulars | L.F. | Discount | Cash | Bank |
|---|---|---|---|---|---|
| Wed | Supplier account | 30 | 1,500 | ||
| Thu | Wages | 600 | |||
| Fri | Bank (deposit) | C | 700 | ||
| Fri | Bank charges | 25 | |||
| Fri | Balance c/d | 300 | 4,175 | ||
| Total | 30 | 1,600 | 5,700 |
Reading the result:
- Cash: $1,600 received minus $1,300 paid leaves $300, which should match the cash physically in the drawer.
- Bank: $5,700 received minus $1,525 paid leaves $4,175. The $700 deposit appears in both columns, so total funds fell only by what actually left the business.
- Discounts: $50 is posted to discount allowed (an expense) and $30 to discount received (income). Neither figure is carried down.
The same logic handles a common textbook instruction such as “deposited all cash in excess of a set minimum into the bank.” You calculate the cash balance at that moment, subtract the required minimum, and record the excess as a contra entry. A cash sale where part of the money is banked the same day is split: the cash portion goes in the cash column and the banked portion in the bank column.
Why a Cash Book Matters
- Cash visibility. The running balances show available cash without waiting for month-end statements, which helps with paying bills and planning purchases.
- Bank reconciliation. A bank column that mirrors the bank account makes it straightforward to compare the business’s record with the statement and explain each difference.
- Audit trail. Dates, reference numbers and folio links let an auditor or tax examiner, such as HMRC in the UK, trace any payment back to its source document.
- Error and fraud detection. A cash column in credit, a till that does not match the book, or an unexplained bank difference quickly points to a mistake or a missing amount.
- Input for financial statements. The closing cash and bank balances feed the current assets section of the balance sheet, and the categorized receipts and payments support a cash flow statement.
Limitations of a Cash Book
- Cash basis only. Credit sales, credit purchases, depreciation and accrued expenses are not recorded, so profit cannot be read from the cash book. Profit comes from the income statement, which is usually prepared on an accrual basis.
- Bank items arrive late. Bank charges, interest and direct debits may not be known until the statement arrives, and checks issued may not have cleared. The bank column and the statement will disagree until reconciled.
- Omissions go undetected. If a payment is never entered, the book still balances. Only a physical cash count or a reconciliation exposes it.
- No forward view. It records what has happened, not what is due. Upcoming payables and receivables sit in other records.
Cash Book vs. Related Records
| Record | What it holds | How it differs from a cash book |
|---|---|---|
| General ledger | All accounts: assets, liabilities, income, expenses, equity | A cash book is a subsidiary book limited to cash and bank, but in traditional systems it also serves as the cash and bank ledger accounts |
| Cash account | Summary of cash postings in the ledger | Only a ledger summary; the cash book is also the book of original entry |
| General journal | Non-cash entries such as credit sales, depreciation and corrections | A cash book handles only transactions that move money |
| Bank statement | The bank’s record of the account | Prepared by the bank, from the bank’s point of view, so a deposit is a credit on the statement but a debit in the cash book |
| Petty cash book | Small day-to-day expenses | A separate book for minor payments; reimbursements appear in the main cash book |
The opposite sign conventions confuse beginners: your bank balance is an asset to you and a liability to the bank.
FAQs
Does a business enter its starting capital in the cash book?
Yes, if the owner introduces capital in cash or by bank transfer. It goes on the debit side in the cash or bank column, with "Capital" as the particulars, and the credit is posted to the capital account.
The Bottom Line
Small business owners, bookkeepers and accounting students use the cash book to track available money and reconcile it with the bank statement. The format should match the business, from a single column for a cash-only shop to a triple column with discounts. The cash book shows only cash movements, so profit, credit transactions and upcoming bills still need the income statement and other records.
