How does the double-entry system record every transaction twice so that the books always balance?
Apply the rules of double-entry bookkeeping to record transactions as debits and credits in the appropriate ledger accounts
A focused answer to the H2 Principles of Accounting outcome on double-entry bookkeeping. The debit and credit rules for the five elements, T-accounts, balancing off, and worked postings of everyday transactions.
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What this dot point is asking
SEAB wants you to apply the rules of double-entry bookkeeping: to record every transaction as a debit in one account and a credit in another, in the correct ledger accounts, and to balance those accounts off. This is the mechanical engine of financial accounting; the trial balance, control accounts and the financial statements all depend on it being done correctly. The central insight is that "debit" and "credit" are not "good" and "bad"; they are simply the left and right sides of an account, and which side increases an item depends on what kind of element it is.
The answer
The debit and credit rules
Every account belongs to one of the five elements, and each element has a natural side that records an increase:
| Element | Increase recorded by | Decrease recorded by | Normal balance |
|---|---|---|---|
| Asset | Debit | Credit | Debit |
| Expense | Debit | Credit | Debit |
| Liability | Credit | Debit | Credit |
| Equity (capital) | Credit | Debit | Credit |
| Income | Credit | Debit | Credit |
A memory aid is DEAD CLIC: Debits record Expenses, Assets and Drawings; Credits record Liabilities, Income and Capital. Every transaction debits at least one account and credits at least one account for the same total, keeping the accounting equation in balance.
T-accounts and the dual effect
Each ledger account is drawn as a T: debits on the left, credits on the right. Because each transaction affects two accounts on opposite sides, the total of all debits always equals the total of all credits. This is the bookkeeping expression of the dual effect of the accounting equation.
Balancing off an account
At the period end each account is balanced:
- Total each side.
- Insert the balancing figure (the difference) on the smaller side as "balance carried down" ().
- Carry it to the next period as "balance brought down" () on the opposite side.
An account where debits exceed credits has a debit balance (typical of assets and expenses); where credits exceed debits it has a credit balance (typical of liabilities, income and capital).
Examples in context
Example 1. A credit sale and its later receipt. Selling goods on credit debits the customer (a receivable asset) and credits sales (income). When the customer later pays by cheque, bank is debited (asset up) and the customer's account is credited (the receivable is cleared). Across the two events, sales income was recognised once, on the sale, exactly as the accrual basis requires.
Example 2. Taking out a bank loan. Receiving a \50,000$ loan debits bank (asset up) and credits the loan account (liability up). Each monthly repayment then debits the loan (liability down) and credits bank (asset down), with any interest debited to an interest expense account. The double entry keeps the loan balance and the bank balance correct at every step.
Try this
Q1. State the double entry for paying \2,000$ rent by cheque. [2 marks]
- Cue. Debit Rent (expense) \2,000\.
Q2. A business buys a van for \30,000$, paying half by cheque and half on credit. Give the three entries. [3 marks]
- Cue. Debit Motor vehicles \30,000\; Credit the supplier (payable) \15,000$.
Q3. Explain why the total of all debit balances must equal the total of all credit balances. [3 marks]
- Cue. Each transaction is recorded with equal debit and credit amounts, so summing every account preserves that equality, which is exactly what the trial balance checks.
Exam-style practice questions
Practice questions written in the style of SEAB exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
Original6 marksRecord the double entry for each transaction in T-account form: (a) the owner pays \20\,000\ on credit from Tan; (c) the business pays Tan \3\,000$ by cheque.Show worked answer →
(a) Owner pays in capital: an asset (bank) increases and equity (capital) increases.
Debit Bank \20,000\.
(b) Buy goods on credit: an expense/asset (purchases) increases and a liability (payable - Tan) increases.
Debit Purchases \5,000\.
(c) Pay Tan by cheque: a liability (Tan) decreases and an asset (bank) decreases.
Debit Tan \3,000\.
After these, Tan's account shows a credit balance of 5\,000 - 3\,000 = \2,00020,000 - 3,000 = \.
Markers reward the correct debit and credit for each transaction, naming the accounts, and the residual balances on Tan and Bank.
Original5 marksBalance off the following bank account and bring down the balance: receipts (debits) of \12\,000\; payments (credits) of \7\,000\ and \1\,500$. State whether the balance is a debit or a credit and what it represents.Show worked answer →
Total debits (money in) = 12\,000 + 4\,000 = \16,000$.
Total credits (money out) = 7\,000 + 2\,500 + 1\,500 = \11,000$.
Balance = 16\,000 - 11\,000 = \5,000\, carried down on the debit side.
A debit balance on the bank account represents a positive cash-at-bank asset of \5,000\text{b/d}$) on the debit side to start the next period.
Markers reward the totalling of each side, the \5,000$ balance, identifying it as a debit balance, and stating that it is a bank asset.
Related dot points
- Describe the books of prime entry and the ledger system and explain how source documents flow through them to the accounts
A focused answer to the H2 Principles of Accounting outcome on books of prime entry and the ledgers. Source documents, the journals (sales, purchases, returns, cash, general), posting to the sales, purchases and general ledgers, and the audit trail.
- Prepare a trial balance from ledger balances and explain the errors it does and does not reveal
A focused answer to the H2 Principles of Accounting outcome on the trial balance. Listing debit and credit balances, why it should agree, the six errors that do not affect agreement, and what a balanced trial balance does and does not prove.
- State the accounting equation and demonstrate how transactions affect assets, liabilities and equity while keeping it in balance
A focused answer to the H2 Principles of Accounting outcome on the accounting equation. Assets equal liabilities plus equity, the dual effect of transactions, the expanded equation with income and drawings, and worked balance changes.
- Prepare control accounts and a bank reconciliation statement and explain how each acts as an independent check
A focused answer to the H2 Principles of Accounting outcome on control accounts and bank reconciliation. The receivables and payables control accounts, reconciling to the personal ledgers, and reconciling the cash book to the bank statement.